Docu References:
Drive file picker v3
G Suite Dialogs: File Open Dialog
SO References:
Access data in Google App Script from spread sheet modal html form
How do I handle the call back using multiple Google File Picker
What to achieve?
In a Google Sheets script, I would like to define a Files Picker that returns the data of picked up files, provided that thereon, from another part of the scripts, the caller can receive that data.
Problem:
The file picker is launched as an html Modal dialog. After searching for a while, the only solution to get the data from the script that launched the picker is from the html script code:
set the callaback of the picker to a specific function: picker.setCallback(my_callback)
or use google.script.run.my_callback (i.e. from button Done for instance)
... provided that my_callback function defined in your script gets the data.
The problem with the above is that you cannot use the same picker for multiple purposes, because:
my_callback is fixed in the html script
my_callback cannot know for what purpose the picker was initially called (i.e. should it get the content?, should it give the information to some unknown caller?).
Once it gets the data, my_callback does not know what to do with it... unless my_callback is tied to only 1 caller; which does not seem correct, as that would require to have multiple html definitions for the picker, once per each reason you may invoke it, so it can call back to the proper function.
Any ideas?
global variables in scripts get re-initialized and cannot use PropertiesService to store values other than String (so no way to store the final picker_callback through a global var).
google.script.run does not offer calls by giving the name of the server-side function as String (reference) (which discards having a function to generate the picker_dialog.html by changing the callback function).
Sample Code
code.gs
function ui() {
return SpreadsheetApp.getUi();
}
function onOpen() {
ui().createMenu('ecoPortal Tools')
.addItem('Read a file', 'itemReadFile')
.addItem('Edit a file', 'itemEditFile')
.addToUi();
}
function itemReadFile() {
pickFile(readFile)
}
function itemEditFile() {
pickFile(editFile)
}
function readFile(data) {
/* do some stuff */
}
function editFile(data) {
/* do some stuff */
}
picker.gs:
function pickFile(callback) {
var html = HtmlService.createHtmlOutputFromFile('picker_dialog.html')
.setWidth(600)
.setHeight(425)
.setSandboxMode(HtmlService.SandboxMode.IFRAME);
// concept (discarded):
callback_set('picker', callback)
ui().showModalDialog(html, 'Select a file');
}
function getOAuthToken() {
DriveApp.getRootFolder();
return ScriptApp.getOAuthToken();
}
// picker callback hub
function pickerCallback(data) {
var callback = callback_get('picker');
callback_set('picker', null);
if (callback) callback.call(data);
}
picker_dialog.html
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://ssl.gstatic.com/docs/script/css/add-ons.css">
<script>
var DEVELOPER_KEY = '___PICKER_API_KEY_____';
var DIALOG_DIMENSIONS = {width: 600, height: 425};
var pickerApiLoaded = false;
// currently selected files data
var files_data = null;
/**
* Loads the Google Picker API.
*/
function onApiLoad() {
gapi.load('picker', {'callback': function() {
pickerApiLoaded = true;
}});
}
function getOAuthToken() {
console.log("going to call get auth token :)");
google.script.run.withSuccessHandler(createPicker)
.withFailureHandler(showError).getOAuthToken();
}
function createPicker(token) {
console.log("pickerApiLoadded", pickerApiLoaded);
console.log("token", token);
if (pickerApiLoaded && token) {
var picker = new google.picker.PickerBuilder()
.addView(google.picker.ViewId.DOCS)
.enableFeature(google.picker.Feature.NAV_HIDDEN)
.hideTitleBar()
.setOAuthToken(token)
.setDeveloperKey(DEVELOPER_KEY)
.setCallback(pickerCallback)
.setOrigin(google.script.host.origin)
.setSize(DIALOG_DIMENSIONS.width - 2,
DIALOG_DIMENSIONS.height - 2)
.build();
picker.setVisible(true);
} else {
showError('Unable to load the file picker.');
}
}
function pickerCallback(data) {
var action = data[google.picker.Response.ACTION];
if (action == google.picker.Action.PICKED) {
files_data = data;
var doc = data[google.picker.Response.DOCUMENTS][0];
var id = doc[google.picker.Document.ID];
var url = doc[google.picker.Document.URL];
var title = doc[google.picker.Document.NAME];
document.getElementById('result').innerHTML =
'<b>You chose:</b><br>Name: <a href="' + url + '">' + title +
'</a><br>ID: ' + id;
} else if (action == google.picker.Action.CANCEL) {
document.getElementById('result').innerHTML = 'Picker canceled.';
}
}
function showError(message) {
document.getElementById('result').innerHTML = 'Error: ' + message;
}
function closeIt() {
google.script.host.close();
}
function returnSelectedFilesData() {
google.script.run.withSuccessHandler(closeIt).pickerCallback(files_data);
}
</script>
</head>
<body>
<div>
<button onclick='getOAuthToken()'>Select a file</button>
<p id='result'></p>
<button onclick='returnSelectedFilesData()'>Done</button>
</div>
<script src="https://apis.google.com/js/api.js?onload=onApiLoad"></script>
</body>
</html>
picker.setCallback(my_callback)
Picker callback is different from:
or use google.script.run.my_callback
The former calls a function on the frontend html while the latter calls a function in the server.
my_callback cannot know for what purpose the picker was initially called
You can send a argument to the server:
google.script.run.my_callback("readFile");
On the server side(code.gs),
fuction my_callback(command){
if(command === "readFile") Logger.log("Picker called me to readFile");
}
google.script.run does not offer calls by giving the name of the server-side function as String
Not true. Dot is used to access members of a object. You can use bracket notation to access a member as a string:
google.script.run["my_callback"]();
EDITED BY Q.ASKER:
In your case, to pass the files_data to the server side:
google.script.run.withSuccessHandler(closeIt)[my_callback](files_data);
Now, for my_callback (String variable) to be set from server side, you need to push it using templates:
function pickFile(str_callback) {
var htmlTpl = HtmlService.createTemplateFromFile('picker_dialog.html');
// push variables
htmlTpl.str_callback = str_callback;
var htmlOut = htmlTpl.evaluate()
.setWidth(600)
.setHeight(425)
.setSandboxMode(HtmlService.SandboxMode.IFRAME);
ui().showModalDialog(htmlOut, 'Select a file');
}
The two unique changes that you need to make to your picker_dialog.html:
add printing scriptlet to set my_callback (<?= ... ?>)
use the google.script.run as mentioned
var my_callback = <?= str_callback? str_callback : 'defaultPickerCallbackToServer' ?>;
/* ... omitted code ... */
function returnSelectedFilesData() {
google.script.run.withSuccessHandler(closeDialog)[my_callback](files_data);
}
Now, when you call pickFile to open the frontend picker, you are able to set a different server callback that will receive the data with the file(s) chosen by the user.
Related
I am trying to execute Apps Script function using Apps Script API. For this I set up a target script and calling script (JavaScript code) using instructions from Google here.
I followed exactly how it is described but I am getting the following errors.
Error in calling script:
ReferenceError: gapi is not defined
Error on target script while manually running the function "getFoldersUnderRoot()"
Exception: We're sorry, a server error occurred. Please wait a bit and try again.
function "getFoldersUnderRoot()" was running properly before connecting the target script to the GCP project.
Any help is appreciated to point out what I am doing wrong.
I figured out how to execute App Script functions using Apps Script API. So I am posting the answer for the benefit of others. Also I would try to plug in the missing information which Google has not provided in their instructions.
The target script is an App Script (e.g. "code.gs") file with the required functions to be executed. This script has to be attached to a GCP project with App Script API enabled.
The calling script has to be an html file saved in a local folder and not an App Script file. Below is an example "index.html" which calls two functions "callScriptFunction()" and "getSheets()".
<!DOCTYPE html>
<html>
<head>
<title>Google Apps Script API Quickstart</title>
<meta charset="utf-8" />
</head>
<body>
<p>Google Apps Script API Quickstart</p>
<!--Add buttons to initiate auth sequence and sign out-->
<button id="authorize_button" style="display: none;">Authorize</button>
<button id="signout_button" style="display: none;">Sign Out</button>
<pre id="content" style="white-space: pre-wrap;"></pre>
<script type="text/javascript">
// Client ID and API key from the Developer Console
var CLIENT_ID = 'YOUR_CLIENT_ID';
var API_KEY = 'YOUR_API_KEY';
// Array of API discovery doc URLs for APIs used by the quickstart
var DISCOVERY_DOCS = ["https://script.googleapis.com/$discovery/rest?version=v1"];
// Authorization scopes required by the API; multiple scopes can be
// included, separated by spaces.
var SCOPES = 'https://www.googleapis.com/auth/spreadsheets https://www.googleapis.com/auth/drive.readonly';
var authorizeButton = document.getElementById('authorize_button');
var signoutButton = document.getElementById('signout_button');
/**
* On load, called to load the auth2 library and API client library.
*/
function handleClientLoad() {
gapi.load('client:auth2', initClient);
}
/**
* Initializes the API client library and sets up sign-in state
* listeners.
*/
function initClient() {
gapi.client.init({
apiKey: API_KEY,
clientId: CLIENT_ID,
discoveryDocs: DISCOVERY_DOCS,
scope: SCOPES
}).then(function () {
// Listen for sign-in state changes.
gapi.auth2.getAuthInstance().isSignedIn.listen(updateSigninStatus);
// Handle the initial sign-in state.
updateSigninStatus(gapi.auth2.getAuthInstance().isSignedIn.get());
authorizeButton.onclick = handleAuthClick;
signoutButton.onclick = handleSignoutClick;
}, function(error) {
appendPre(JSON.stringify(error, null, 2));
});
}
/**
* Called when the signed in status changes, to update the UI
* appropriately. After a sign-in, the API is called.
*/
function updateSigninStatus(isSignedIn) {
if (isSignedIn) {
authorizeButton.style.display = 'none';
signoutButton.style.display = 'block';
// callScriptFunction();
getSheets();
} else {
authorizeButton.style.display = 'block';
signoutButton.style.display = 'none';
}
}
/**
* Sign in the user upon button click.
*/
function handleAuthClick(event) {
gapi.auth2.getAuthInstance().signIn();
}
/**
* Sign out the user upon button click.
*/
function handleSignoutClick(event) {
gapi.auth2.getAuthInstance().signOut();
}
/**
* Append a pre element to the body containing the given message
* as its text node. Used to display the results of the API call.
*
* #param {string} message Text to be placed in pre element.
*/
function appendPre(message) {
var pre = document.getElementById('content');
var textContent = document.createTextNode(message + '\n');
pre.appendChild(textContent);
}
/**
* Shows basic usage of the Apps Script API.
*
* Call the Apps Script API to create a new script project, upload files
* to the project, and log the script's URL to the user.
*/
function callScriptFunction() {
var scriptId = "TARGET_SCRIPT_ID";
// Call the Apps Script API run method
// 'scriptId' is the URL parameter that states what script to run
// 'resource' describes the run request body (with the function name
// to execute)
gapi.client.script.scripts.run({
'scriptId': scriptId,
'resource': {
'function': 'getFoldersUnderRoot',
'devMode': true
}
}).then(function(resp) {
var result = resp.result;
if (result.error && result.error.status) {
// The API encountered a problem before the script
// started executing.
appendPre('Error calling API:');
appendPre(JSON.stringify(result, null, 2));
} else if (result.error) {
// The API executed, but the script returned an error.
// Extract the first (and only) set of error details.
// The values of this object are the script's 'errorMessage' and
// 'errorType', and an array of stack trace elements.
var error = result.error.details[0];
appendPre('Script error message: ' + error.errorMessage);
if (error.scriptStackTraceElements) {
// There may not be a stacktrace if the script didn't start
// executing.
appendPre('Script error stacktrace:');
for (var i = 0; i < error.scriptStackTraceElements.length; i++) {
var trace = error.scriptStackTraceElements[i];
appendPre('\t' + trace.function + ':' + trace.lineNumber);
}
}
} else {
// The structure of the result will depend upon what the Apps
// Script function returns. Here, the function returns an Apps
// Script Object with String keys and values, and so the result
// is treated as a JavaScript object (folderSet).
var folderSet = result.response.result;
if (Object.keys(folderSet).length == 0) {
appendPre('No folders returned!');
} else {
appendPre('Folders under your root folder:');
Object.keys(folderSet).forEach(function(id){
appendPre('\t' + folderSet[id] + ' (' + id + ')');
});
}
}
});
}
function getSheets() {
// ID of the script to call. Acquire this from the Apps Script editor,
// under Publish > Deploy as API executable.
var scriptId = "TARGET_SCRIPT_ID";
// Initialize parameters for function call.
var sheetId = "SPREADSHEET_ID";
gapi.client.script.scripts.run({
'scriptId': scriptId,
'resource': {
'function': 'getSheetNames',
'parameters': [sheetId],
'devMode': true
}
}).then(function(resp) {
var result = resp.result;
if (result.error && result.error.status) {
// The API encountered a problem before the script
// started executing.
appendPre('Error calling API:');
appendPre(JSON.stringify(result, null, 2));
} else if (result.error) {
// The API executed, but the script returned an error.
// Extract the first (and only) set of error details.
// The values of this object are the script's 'errorMessage' and
// 'errorType', and an array of stack trace elements.
var error = result.error.details[0];
appendPre('Script error message: ' + error.errorMessage);
if (error.scriptStackTraceElements) {
// There may not be a stacktrace if the script didn't start
// executing.
appendPre('Script error stacktrace:');
for (var i = 0; i < error.scriptStackTraceElements.length; i++) {
var trace = error.scriptStackTraceElements[i];
appendPre('\t' + trace.function + ':' + trace.lineNumber);
}
}
} else {
// The structure of the result will depend upon what the Apps
// Script function returns. Here, the function returns an Apps
// Script Object with String keys and values, and so the result
// is treated as a JavaScript object (folderSet).
var names = result.response.result;
if (Object.keys(names).length == 0) {
appendPre('No sheetnames returned!');
} else {
appendPre(names);
}
}
});
}
</script>
<script async defer src="https://apis.google.com/js/api.js"
onload="this.onload=function(){};handleClientLoad()"
onreadystatechange="if (this.readyState === 'complete') this.onload()">
</script>
</body>
</html>
Below is an example of target script.
function getFoldersUnderRoot() {
var root = DriveApp.getRootFolder();
var folders = root.getFolders();
var folderSet = {};
while (folders.hasNext()) {
var folder = folders.next();
folderSet[folder.getId()] = folder.getName();
}
return folderSet;
}
function getSheetNames(sheetId) {
var ss = SpreadsheetApp.openById(sheetId);
var sheets = ss.getSheets();
var names = sheets.map(function(sheet) {
return sheet.getName();
})
return names;
}
From terminal change to the working directory and execute python3 -m http.server 8000. Open browser and load "http://localhost:8000/". Authourize and proceed.
You need to whitelist "http://localhost:8000/" in the project credentials
You need to add required scopes in OAuth Consent Screen of the project.
I am able to execute the function "getSheetNames()" but "getFoldersUnderRoot()" is throwing error: Exception: We're sorry, a server error occurred. Please wait a bit and try again. Executing from the script editor also gives the same error. However "getFoldersUnderRoot()" is executable on any other script which is not attached to a GCP project
I am using the Google Drive Picker API to facilitate file upload from within a Google Spreadsheet.
The problem the user is reporting is that not all folders in a sub folder are visible or searchable.
The sub folder in question has a large amount of sub folders itself. (About a 1000+)
Does anyone know if Drive Picker has some kind of a limitation around the number of folders it can display?
As requested my code below:
function showPicker() {
var html = HtmlService.createHtmlOutputFromFile('0.2 Picker.html')
.setWidth(600)
.setHeight(425)
.setSandboxMode(HtmlService.SandboxMode.IFRAME);
SpreadsheetApp.getUi().showModalDialog(html, 'Select Invoice(s)');
}
function getOAuthToken() {
DriveApp.getRootFolder();
return ScriptApp.getOAuthToken();
}
//Picker.html
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://ssl.gstatic.com/docs/script/css/add-ons.css">
<script type="text/javascript">
var DIALOG_DIMENSIONS = {
width: 600,
height: 425
};
var pickerApiLoaded = false;
function onApiLoad() {
gapi.load('picker', {
'callback': function() {
pickerApiLoaded = true;
}
});
google.script.run.withSuccessHandler(createPicker)
.withFailureHandler(showError).getOAuthToken();
}
function createPicker(token) {
if (pickerApiLoaded && token) {
var docsView = new google.picker.DocsView(google.picker.ViewId.FOLDERS)
.setIncludeFolders(true)
.setMimeTypes('application/vnd.google-apps.spreadsheet')
.setParent("ID_OF_FOLDER_GOES_HERE");
var picker = new google.picker.PickerBuilder()
.addView(docsView)
.enableFeature(google.picker.Feature.NAV_HIDDEN)
.enableFeature(google.picker.Feature.MULTISELECT_ENABLED)
.enableFeature(google.picker.Feature.SUPPORT_DRIVES)
.hideTitleBar()
.setSize(DIALOG_DIMENSIONS.width - 2, DIALOG_DIMENSIONS.height - 2)
.setOAuthToken(token)
.setCallback(pickerCallback)
.setOrigin('https://docs.google.com')
.build();
picker.setVisible(true);
} else {
showError('Unable to load the file picker.');
}
}
/**
* A callback function that extracts the chosen document's metadata from the
* response object. For details on the response object, see
* https://developers.google.com/picker/docs/result
*
* #param {object} data The response object.
*/
function pickerCallback(data) {
//Get the user's response action
var action = data[google.picker.Response.ACTION];
//Test if users selected "Picked", if true, do the following:
if (action == google.picker.Action.PICKED) {
//Get documents uploaded by google picker
var files = data[google.picker.Response.DOCUMENTS];
//Create an array to house ID's of uploaded documents
var arrayOfIds = [];
//For the number of elements in the files array do the following
for (var i = 0; i < files.length; i++) {
//Get the id of the current file
var id = files[i][google.picker.Document.ID]
//Push id of current file into arrayOfIds
arrayOfIds.push(id)
}//END OF FOR LOOP I
//Call getInvoiceData passing in array of IDs
google.script.run.getInvoiceData(arrayOfIds);
//Close the upload box
google.script.host.close()
}//END OF IF STATEMENT
//Check action does not "Picked", check if action is "Cancel"
else if (action == google.picker.Action.CANCEL) {
google.script.host.close();
}//END OF ELSE IF
}//END OF FUNCTION
function showError(message) {
document.getElementById('result').innerHTML = 'Error: ' + message;
}
</script>
</head>
<body>
<div>
<p id='result'></p>
</div>
<script type="text/javascript" src="https://apis.google.com/js/api.js?onload=onApiLoad"></script>
</body>
</html>
I run a Google Apps script that uploads a file to the user's Google Drive file:
function doGet(e) {
var blob = UrlFetchApp.fetch(e.parameters.url).getBlob();
DriveApp.createFile(blob);
return HtmlService.createHtmlOutput("DONE!");
}
My site loads a popup window that runs a Google Apps Script with that code. Works fine.
Now, how do I communicate back to my site that they user has successfully uploaded the file? As in, how can I communicate back to my server that the user has run doGet()?`
Some type of response handling must exist?
Full working code (test it out on JSBin):
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.js"></script>
</head>
<body>
<div class="google-upload" data-url="https://calibre-ebook.com/downloads/demos/demo.docx">
<span style="background-color: #ddd">Upload</span>
</div>
<script>
$(function() {
$(".google-upload").click(function() {
var url = "https://script.google.com/macros/s/AKfycbwsuIcO5R86Xgv4E1k1ZtgtfKaENaKq2ZfsLGWZ4aqR0d9WBYc/exec"; // Please input the URL here.
var withQuery = url + "?url=";
window.open(withQuery + $('.google-upload').attr("data-url"), "_blank", "width=600,height=600,scrollbars=1");
});
});
</script>
</body>
</html>
So to clarify, I want a way to find out whether if the user has successfully uploaded the file. Something like:
request.execute(function(response) {
if (response.code == 'uploaded') {
// uploaded, do stuff
} else {
// you get the idea...
}
});
Adding a bounty for a complete solution to this.
Rather than returning a HtmlService object, you can pass data using jQuery's $.getJSON method and retrieve data from the doGet function with ContentService. Google Apps Script does not accept CORS, so using JSONP is the best way to get data to and from your script. See this post for more.
Working CodePen Example
I split your HTML and scripts for clarity. None of the HTML changed from your original example.
Code.gs
function doGet(e) {
var returnValue;
// Set the callback param. See https://stackoverflow.com/questions/29525860/
var callback = e.parameter.callback;
// Get the file and create it in Drive
try {
var blob = UrlFetchApp.fetch(e.parameters.url).getBlob();
DriveApp.createFile(blob);
// If successful, return okay
// Structure this JSON however you want. Parsing happens on the client side.
returnValue = {status: 'okay'};
} catch(e) {
Logger.log(e);
// If a failure, return error message to the client
returnValue = {status: e.message}
}
// Returning as JSONP allows for crossorigin requests
return ContentService.createTextOutput(callback +'(' + JSON.stringify(returnValue) + ')').setMimeType(ContentService.MimeType.JAVASCRIPT);
}
Client JS
$(function() {
$(".google-upload").click(function() {
var appUrl = "https://script.google.com/macros/s/AKfycbyUvgKdhubzlpYmO3Marv7iFOZwJNJZaZrFTXCksxtl2kqW7vg/exec";
var query = appUrl + "?url=";
var popupUrl = query + $('.google-upload').attr("data-url") + "&callback=?";
console.log(popupUrl)
// Open this to start authentication.
// If already authenticated, the window will close on its own.
var popup = window.open(popupUrl, "_blank", "width=600,height=600,scrollbars=1");
$.getJSON(popupUrl, function(returnValue) {
// Log the value from the script
console.log(returnValue.status);
if(returnValue.status == "okay") {
// Do stuff, like notify the user, close the window
popup.close();
$("#result").html("Document successfully uploaded");
} else {
$("#result").html(returnValue);
}
})
});
});
You can test the error message by passing an empty string in the data-url param. The message is returned in the console as well as the page for the user.
Edit 3.7.18
The above solution has problems with controlling the authorization flow. After researching and speaking with a Drive engineer (see thread here) I've reworked this into a self-hosted example based on the Apps Script API and running the project as an API executable rather than an Apps Script Web App. This will allow you to access the [run](https://developers.google.com/apps-script/api/reference/rest/v1/scripts/run) method outside an Apps Script web app.
Setup
Follow the Google Apps Script API instructions for JavaScript. The Apps Script project should be a standalone (not linked to a document) and published as API executable. You'll need to open the Cloud Console and create OAuth credentials and an API key.
The instructions have you use a Python server on your computer. I use the Node JS server, http-server, but you can also put it live online and test from there. You'll need to whitelist your source in the Cloud Console.
The client
Since this is self hosted, you'll need a plain HTML page which authorizes the user through the OAuth2 API via JavaScript. This is preferrable because it keeps the user signed in, allowing for multiple API calls to your script without reauthorization. The code below works for this application and uses the authorization flow from the Google quickstart guides.
index.html
<body>
<!--Add buttons to initiate auth sequence and sign out-->
<button id="authorize-button" style="display: none;">Authorize</button>
<button id="signout-button" style="display: none;">Sign Out</button>
<button onclick="uploadDoc()" style="margin: 10px;" id="google-upload" data-url="https://calibre-ebook.com/downloads/demos/demo.docx">Upload doc</button>
<pre id="content"></pre>
</body>
index.js
// Client ID and API key from the Developer Console
var CLIENT_ID = 'YOUR_CLIENT_ID';
var API_KEY = 'YOUR_API_KEY';
var SCRIPT_ID = 'YOUR_SCRIPT_ID';
// Array of API discovery doc URLs for APIs used by the quickstart
var DISCOVERY_DOCS = ["https://script.googleapis.com/$discovery/rest?version=v1"];
// Authorization scopes required by the API; multiple scopes can be
// included, separated by spaces.
var SCOPES = 'https://www.googleapis.com/auth/drive https://www.googleapis.com/auth/script.external_request';
var authorizeButton = document.getElementById('authorize-button');
var signoutButton = document.getElementById('signout-button');
var uploadButton = document.getElementById('google-upload');
var docUrl = uploadButton.getAttribute('data-url').value;
// Set the global variable for user authentication
var isAuth = false;
/**
* On load, called to load the auth2 library and API client library.
*/
function handleClientLoad() {
gapi.load('client:auth2', initClient);
}
/**
* Initializes the API client library and sets up sign-in state
* listeners.
*/
function initClient() {
gapi.client.init({
apiKey: API_KEY,
clientId: CLIENT_ID,
discoveryDocs: DISCOVERY_DOCS,
scope: SCOPES
}).then(function () {
// Listen for sign-in state changes.
gapi.auth2.getAuthInstance().isSignedIn.listen(updateSigninStatus);
// Handle the initial sign-in state.
updateSigninStatus(gapi.auth2.getAuthInstance().isSignedIn.get());
authorizeButton.onclick = handleAuthClick;
signoutButton.onclick = handleSignoutClick;
// uploadButton.onclick = uploadDoc;
});
}
/**
* Called when the Upload button is clicked. Reset the
* global variable to `true` and upload the document.
* Thanks to #JackBrown for the logic.
*/
function updateSigninStatus(isSignedIn) {
if (isSignedIn && !isAuth) {
authorizeButton.style.display = 'none';
signoutButton.style.display = 'block';
uploadButton.style.display = 'block'
uploadButton.onclick = uploadDoc;
} else if (isSignedIn && isAuth) {
authorizeButton.style.display = 'none';
signoutButton.style.display = 'block';
uploadButton.style.display = 'block';
uploadDoc();
} else {
authorizeButton.style.display = 'block';
signoutButton.style.display = 'none';
uploadButton.style.display = 'none';
isAuth = false;
}
}
/**
* Sign in the user upon button click.
*/
function handleAuthClick(event) {
gapi.auth2.getAuthInstance().signIn();
isAuth = true; // Update the global variable
}
/**
* Sign out the user upon button click.
*/
function handleSignoutClick(event) {
gapi.auth2.getAuthInstance().signOut();
isAuth = false; // update the global variable
}
/**
* Append a pre element to the body containing the given message
* as its text node. Used to display the results of the API call.
*
* #param {string} message Text to be placed in pre element.
*/
function appendPre(message) {
var pre = document.getElementById('content');
var textContent = document.createTextNode(message + '\n');
pre.appendChild(textContent);
}
/**
* Handle the login if signed out, return a Promise
* to call the upload Docs function after signin.
**/
function uploadDoc() {
console.log("clicked!")
var docUrl = document.getElementById('google-upload').getAttribute('data-url');
gapi.client.script.scripts.run({
'scriptId':SCRIPT_ID,
'function':'uploadDoc',
'parameters': [ docUrl ]
}).then(function(resp) {
var result = resp.result;
if(result.error && result.error.status) {
// Error before the script was Called
appendPre('Error calling API');
appendPre(JSON.parse(result, null, 2));
} else if(result.error) {
// The API executed, but the script returned an error.
// Extract the first (and only) set of error details.
// The values of this object are the script's 'errorMessage' and
// 'errorType', and an array of stack trace elements.
var error = result.error.details[0];
appendPre('Script error message: ' + error.errorMessage);
if (error.scriptStackTraceElements) {
// There may not be a stacktrace if the script didn't start
// executing.
appendPre('Script error stacktrace:');
for (var i = 0; i < error.scriptStackTraceElements.length; i++) {
var trace = error.scriptStackTraceElements[i];
appendPre('\t' + trace.function + ':' + trace.lineNumber);
}
}
} else {
// The structure of the result will depend upon what the Apps
// Script function returns. Here, the function returns an Apps
// Script Object with String keys and values, and so the result
// is treated as a JavaScript object (folderSet).
console.log(resp.result)
var msg = resp.result.response.result;
appendPre(msg);
// do more stuff with the response code
}
})
}
Apps Script
The Apps Script code does not need to be modified much. Instead of returning using ContentService, we can return plain JSON objects to be used by the client.
function uploadDoc(e) {
Logger.log(e);
var returnValue = {};
// Set the callback URL. See https://stackoverflow.com/questions/29525860/
Logger.log("Uploading the document...");
try {
// Get the file and create it in Drive
var blob = UrlFetchApp.fetch(e).getBlob();
DriveApp.createFile(blob);
// If successful, return okay
var msg = "The document was successfully uploaded!";
return msg;
} catch(e) {
Logger.log(e);
// If a failure, return error message to the client
return e.message
}
}
I had a hard time getting CodePen whitelisted, so I have an example hosted securely on my own site using the code above. Feel free to inspect the source and take a look at the live Apps Script project.
Note that the user will need to reauthorize as you add or change scopes in your Apps Script project.
I have a script that uses the file picker but I need to pass a specific parameter which is called userId and is kept as a global variable in the calling script. As the calls are asynchronous it seems I cannot access this parameter. Is there a way to access the parameter from the html file or pass this parameter to the html?
I might be mixing templated html and non templated.
Here is the calling code (initiated through a menu item in a spreadsheet):
function syncStudentsFile(userId, ss) {
scriptUser_(userId); // save userId
Logger.log('SRSConnect : syncStudentsFile : userId:'+userId); // userId is correct here
var ss = SpreadsheetApp.getActiveSpreadsheet();
var html = HtmlService.createHtmlOutputFromFile('PickerSync.html')
.setWidth(600).setHeight(425);
SpreadsheetApp.getUi().showModalDialog(html, 'Select a file');
}
function scriptUser_(userId) {
if (userId !== undefined)
sUserId = userId; // Global variable
try { return sUserId; } catch (e) { return undefined; }
}
function getOAuthToken() { // used by Picker
DriveApp.getRootFolder();
return ScriptApp.getOAuthToken();
}
Here is the html picker file:
<link rel="stylesheet" href="https://ssl.gstatic.com/docs/script/css/add-ons.css">
<script type="text/javascript">
var DEVELOPER_KEY = '..............';
var DIALOG_DIMENSIONS = {width: 600, height: 425};
var pickerApiLoaded = false;
/**
* Loads the Google Picker API.
*/
gapi.load('picker', {'callback': function() {
pickerApiLoaded = true;
}});
/**
* Gets the user's access token from the server-side script so that
* it can be passed to Picker. This technique keeps Picker from needing to
* show its own authorization dialog, but is only possible if the OAuth scope
* that Picker needs is available in Apps Script. Otherwise, your Picker code
* will need to declare its own OAuth scopes.
*/
function getOAuthToken() {
google.script.run.withSuccessHandler(createPicker)
.withFailureHandler(showError).getOAuthToken();
}
/**
* Creates a Picker that can access the user's spreadsheets. This function
* uses advanced options to hide the Picker's left navigation panel and
* default title bar.
*
* #param {string} token An OAuth 2.0 access token that lets Picker access the
* file type specified in the addView call.
*/
function createPicker(token) {
if (pickerApiLoaded && token) {
var uploadView = new google.picker.DocsUploadView();
var picker = new google.picker.PickerBuilder()
// Instruct Picker to display only spreadsheets in Drive. For other
// views, see https://developers.google.com/picker/docs/#otherviews
.addView(google.picker.ViewId.DOCS)
.addView(google.picker.ViewId.RECENTLY_PICKED)
.addView(uploadView)
.hideTitleBar()
.setOAuthToken(token)
.setDeveloperKey(DEVELOPER_KEY)
.setCallback(pickerCallback)
// Instruct Picker to fill the dialog, minus 2 pixels for the border.
.setSize(DIALOG_DIMENSIONS.width - 2,
DIALOG_DIMENSIONS.height - 2)
.build();
picker.setVisible(true);
} else {
showError('Unable to load the file picker.');
}
}
/**
* A callback function that extracts the chosen document's metadata from the
* response object. For details on the response object, see
* https://developers.google.com/picker/docs/result
*
* #param {object} data The response object.
*/
function pickerCallback(data) {
var action = data[google.picker.Response.ACTION];
if (action == google.picker.Action.PICKED) {
var doc = data[google.picker.Response.DOCUMENTS][0];
var id = doc[google.picker.Document.ID];
google.script.host.close();
// --------------> user global parameter sUserId set earlier
google.script.run.PickerSyncFile(sUserId, id);
} else if (action == google.picker.Action.CANCEL) {
google.script.host.close();
}
}
/**
* Displays an error message within the #result element.
*
* #param {string} message The error message to display.
*/
function showError(message) {
document.getElementById('result').innerHTML = 'Error: ' + message;
}
</script>
<div>
<script>getOAuthToken()</script>
<p id='result'></p>
<input type="button" value="Close" onclick="google.script.host.close()" />
</div>
Here is the picker code:
function pickerSyncFile(userId, id) {
Logger.log('userId:'+userId); // BUG: it is null
Logger.log('id:'+id); // id returned well from picker
// rest of code here but userId was is incorrect
}
The safest way is to pass the needed data to the HTML directly. If you use properties or cache service it can get complex or fail under multiple simultaneous users.
There are many techniques to pass an initial object from the server (.gs) to the client (.html).
Using HtmlTemplate, you may do:
//.gs file
function doGet() {
var htmlTemplate = HtmlService.createTemplateFromFile('template-client');
htmlTemplate.dataFromServerTemplate = { first: "hello", last: "world" };
var htmlOutput = htmlTemplate.evaluate().setSandboxMode(HtmlService.SandboxMode.IFRAME)
.setTitle('sample');
return htmlOutput;
}
and in your template-client.html file:
<!DOCTYPE html>
<script>
var data = <?!= JSON.stringify(dataFromServerTemplate) ?>; //Stores the data directly in the javascript code
// sample usage
function initialize() {
document.getElementById("myTitle").innerText = data.first + " - " + data.last;
//or use jquery: $("#myTitle").text(data.first + " - " + data.last);
}
// use onload or use jquery to call your initialization after the document loads
window.onload = initialize;
</script>
<html>
<body>
<H2 id="myTitle"></H2>
</body>
</html>
It is also possible to do it without using templating, by appending a hidden div to an HtmlOutput:
//.gs file:
function appendDataToHtmlOutput(data, htmlOutput, idData) {
if (!idData)
idData = "mydata_htmlservice";
// data is encoded after stringifying to guarantee a safe string that will never conflict with the html.
// downside: increases the storage size by about 30%. If that is a concern (when passing huge objects) you may use base94
// or even base128 encoding but that requires more code and can have issues, see http://stackoverflow.com/questions/6008047/why-dont-people-use-base128
var strAppend = "<div id='" + idData + "' style='display:none;'>" + Utilities.base64Encode(JSON.stringify(data)) + "</div>";
return htmlOutput.append(strAppend);
}
// sample usage:
function doGet() {
var htmlOutput = HtmlService.createHtmlOutputFromFile('html-sample')
.setSandboxMode(HtmlService.SandboxMode.IFRAME)
.setTitle('sample');
// data can be any (serializable) javascript object.
// if your data is a native value (like a single number) pass an object like {num:myNumber}
var data = { first: "hello", last: "world" };
// appendDataToHtmlOutput modifies the html and returns the same htmlOutput object
return appendDataToHtmlOutput(data, htmlOutput);
}
and in your output-client.html:
<!DOCTYPE html>
<script>
/**
* getDataFromHtml
*
* Inputs
* idData: optional. id for the data element. defaults to "mydata_htmlservice"
*
* Returns
* The stored data object
*/
function getDataFromHtml(idData) {
if (!idData)
idData = "mydata_htmlservice";
var dataEncoded = document.getElementById(idData).innerHTML;
var data = JSON.parse(atob(dataEncoded));
return data;
}
// sample usage of getDataFromHtml
function initialize() {
var data = getDataFromHtml();
document.getElementById("myTitle").innerText = data.first + " - " + data.last;
//or use jquery: $("#myTitle").text(data.first + " - " + data.last);
}
// use onload or use jquery to call your initialization after the document loads
window.onload = initialize;
</script>
<html>
<body>
<H2 id="myTitle"></H2>
</body>
</html>
Both methods are compared and better explained in this little github I made:
https://github.com/zmandel/htmlService-get-set-data
I often use HtmlService templates to push static values to the client.
index.html
<script>
var domain = "<?=domain?>";
</script>
code.gs
var ui = HtmlService.createTemplateFromFile('Sidebar');
ui.domain = domain;
return ui.evaluate().setSandboxMode(HtmlService.SandboxMode.IFRAME).setTitle(strings[lang][domain]);
In your code:
function scriptUser_(userId) {
if (userId !== undefined)
sUserId = userId; // Global variable
try { return sUserId; } catch (e) { return undefined; }
}
You are assigning a value to the global variable named sUserId. But, then when you try to retrieve it, nothing is there. Global variables loose their value as soon as the current instance of the code bring run is completed. Global variable don't persist their values.
You'll need to use the Properties Service to store the value. Or you could use the Cache service. If you want the value of the user id to expire after some time, use cache service.
By Appending to the HTML File, as shown below.
within Code.gs
function showDialog() {
var html = HtmlService.createHtmlOutputFromFile('html-sample')
.setSandboxMode(HtmlService.SandboxMode.IFRAME)
.setWidth(600)
.setHeight(425);
var data = "Hello World!";
var strAppend = "<div id='id_for_div' style='display:none;'>" + data + "</div>";
html.append(strAppend);
var title = "Demo";
SpreadsheetApp.getUi().showModalDialog(html, title); // or DocumentApp or SlidesApp or FormApp.
}
html-sample.html
<!DOCTYPE html>
<html>
<head>
<script>
function setText(text) {
var element = document.getElementById("myid");
element.innerHTML = text;
}
function getDataFromHtml() {
var id = "id_for_div";
var dataEncoded = document.getElementById(id).innerHTML;
setText(dataEncoded);
}
</script>
</head>
<body>
<h1 id="myid">Sample Text</h1>
<button onclick="getDataFromHtml()">Try Now!</button>
</body>
</html>
Click the 'Try Now!' Button and See the Magic!
This post provides the solution how to pass parameter to a templated html:
html = HtmlService.createTemplateFromFile('page2');
html.id = s1;
Then in page 2 use the the tag to print out the id value;
<div class="info" >
<span id="ID" name="ID"><?=id?></span>
</div>
I have a Google Sites page with an embedded Apps Script gadget. On the page, I want to display ScriptDb data upon clicking a button.
My question is: how can I pass ScriptDb results to the JavaScript embedded in my gadget?
Here is my source:
[Sample-Code.gs]
function doGet() {
// return template page
return HtmlService
.createTemplateFromFile('Sample-HTML')
.evaluate().setSandboxMode(HtmlService.SandboxMode.NATIVE);
}
function include(filename) {
return HtmlService.createHtmlOutputFromFile(filename)
.getContent();
}
// assume db contains 10 'records'
function getData(query) {
var db = ScriptDb.getMyDb();
var data = db.query(query);
Logger.log(data.getSize()); // returns '10.0'
return data; // makes showData think this is null
}
[Sample-HTML.html]
<?!= include('Sample-JavaScript'); ?>
<input type="button" value="show data"
onclick="google.script.run
.withSuccessHandler(showData)
.getData({})" />
[Sample-JavaScript.html]
<script>
function showData(db_query_result) {
alert(db_query_result); // returns null.
}
</script>
The value returned by db.query() is an object as defined in the documentation that can not be used directly in your UI, you should return the value in a format that can be shown in the page : a string or an array of strings.
I didn't test but this should work :
function getData(query) {
var db = ScriptDb.getMyDb();
var result = db.query(query);
Logger.log(result.getSize()); // returns '10.0'
var results = db.query({type: 'person'});
var data = [];
while (results.hasNext()) {
data.push(results.next());
}
return data; // data is an array of results
}