I have a basic MenuBarTemplate set up and displaying.
How do I react to a user's Menu selection and load an appropriate content template?
In the menuItem tag include a template attribute pointing to the template to load and a presentation attribute set to menuBarItemPresenter.
<menuItem template="${this.BASEURL}templates/Explore.xml.js"
presentation="menuBarItemPresenter">
<title>Explore</title>
</menuItem>
You can then use the menu bar's MenuBarDocument feature to associate a document to each menu bar item.
menuBarItemPresenter: function(xml, ele) {
var feature = ele.parentNode.getFeature("MenuBarDocument");
if (feature) {
var currentDoc = feature.getDocument(ele);
if (!currentDoc) {
feature.setDocument(xml, ele);
}
}
This assumes you're using a Presenter.js file like the one in Apple's "TVML Catalog" sample. The load function specified there is what calls the function specified in the menuItem's presentation attribute.
I suppose that TVML and TVJS is similar with HTML and Javascript. When we want to add some interaction into the user interface, we should addEventListener to DOM.
In Apple's "TVML Catalog", Presenter.js is a nice example, but it is abstract, and it could be used in different Present actions.
When I develop my app, I had wrote this demo for handling menuBar selection.
Module : loadTemplate.js
var loadTemplate = function ( baseURL , templateData ){
if( !baseURL ){
throw("baseURL is required");
}
this.BASEURL = baseURL;
this.tpData = templateData;
}
loadTemplate.prototype.loadResource = function ( resource , callback ){
var self = this;
evaluateScripts([resource], function(success) {
if (success) {
var resource = Template.call(self);
callback.call(self, resource);
} else {
var title = "Resource Loader Error",
description = `There was an error attempting to load the resource '${resource}'. \n\n Please try again later.`,
alert = createAlert(title, description);
Presenter.removeLoadingIndicator();
navigationDocument.presentModal(alert);
}
});
}
module.exports = loadTemplate;
Module nav.js ( use menuBarTemplate ) :
import loadTemplate from '../helpers/loadTemplates.js'
let nav = function ( baseURL ){
var loader = new loadTemplate(
baseURL ,
{
"explore" : "EXPLORE",
"subscribe" : "SUBSCRIBE",
"profile" : "PROFILE",
"settings" : "SETTINGS"
}//need to use i18n here
);
loader.loadResource(`${baseURL}templates/main.xml.js`, function (resource){
var parser = new DOMParser();
var navDoc = parser.parseFromString(resource, "application/xml");
navDoc.addEventListener("select" , function ( event ){
console.log( event );
var ele = event.target,
templateURL = ele.getAttribute("template");
if (templateURL) {
loader.loadResource(templateURL,
function(resource) {
if (resource) {
let newParser = new DOMParser();
var doc = newParser.parseFromString( resource , "application/xml" );
var menuBarItemPresenter = function ( xml , ele ){
var feature = ele.parentNode.getFeature("MenuBarDocument");
if( feature ){
var currentDoc = feature.getDocument( ele );
if( !currentDoc ){
feature.setDocument( xml , ele );
}
}
};
menuBarItemPresenter( doc , ele );
}
}
);
}
});
navigationDocument.pushDocument(navDoc);
});//load from teamplate.
}
module.exports = nav;
My code is not the best practice, but as you can see, you just need to addEventListener like you are writing a web application. Then you can handle menuBarTemplate selection easily, even after XHR loading.
Avoid too many callbacks, you should rebuild your code again and again. :-)
I am managing a website displaying a lot of tabular data (language stuff) and running on Jekyll. I really like to display content based on a CSV file stored in the _data folder of Jekyll.
I would like to be able to edit / add / remove content from this CSV directly on Google and then reference it to Jekyll (like a shortcut or something that sync the CSV content from Google to my static folder).
Which way would be the simplest to reference an external file (either in the _data folder or directly in my templace). I can find the CSV file with this kind of link but downloading it every time is a hassle (https://docs.google.com/spreadsheets/d//export?format=csv).
How can Jekyll understand data from external stored file (maybe in javascript ?).
Thank you.
Getting datas from google docs is becoming harder ;-(
I've tried with jquery.ajax but I met the CORS limitation.
Then I found tabletop and it works !
go to your google spreadsheet and File > Publish to the web > Start publishing
note the publish url
download tabletop script and save it to eg: js/tabletop.js
put a link at the bottom of your _includes/header.html eg
<script src="`{{ site.baseurl }}`/js/tabletop.js"></script>
in a data.html page put
---
title: csv to json
layout: page
---
<div id="csvDatas"></div>
you can now get your datas with a js/script.js file that you've also included at the very end of you _includes/footer.html
var csvParse = function() {
// put you document url here
var sharedDocUrl = 'https://docs.google.com/spreadsheets/d/1Rk9RMD6mcH-jPA321lFTKmZsHebIkeHx0tTU0TWQYE8/pubhtml'
// can also be only the ID
// var sharedDocUrl = '1Rk9RMD6mcH-jPA321lFTKmZsHebIkeHx0tTU0TWQYE8'
var targetDiv = 'csvDatas';
// holds datas at a closure level
// this then can be accessed by closure's functions
var dataObj;
function showInfo(data, tabletop) {
dataObj = data;
var table = generateTable();
var target = document.getElementById(targetDiv);
target.appendChild(table);
}
function generateTable(){
var table = document.createElement("table");
var head = generateTableHeader();
table.appendChild(head);
var body = generateTableBody();
table.appendChild(body);
return table;
}
function generateTableHeader(){
var d = dataObj[0];
var tHead = document.createElement("thead");
var colHeader = [];
$.each(d, function( index, value){
console.log(index + ' : ' + value);
colHeader.push(index);
});
var row = generateRow(colHeader, 'th');
tHead.appendChild(row);
return tHead;
}
// this can be factorized with generateTableHeader
function generateTableBody(){
var tBody = document.createElement("tbody");
$.each(dataObj, function( index, value ){
var rowVals = [];
$.each(value, function(colnum, colval){
rowVals.push(colval);
});
var row = generateRow(rowVals);
tBody.appendChild(row);
});
return tBody;
}
function generateRow(headersArray, cellTag){
cellTag = typeof cellTag !== 'undefined' ? cellTag : 'td';
var row = document.createElement("tr");
$.each(headersArray, function( index, value){
if( value != "rowNumber"){
var cell = document.createElement(cellTag);
var cellText = document.createTextNode(value);
cell.appendChild(cellText);
row.appendChild(cell);
}
});
return row;
}
return {
init: function() {
if( $('#' + targetDiv).length ){
Tabletop.init( { key: sharedDocUrl ,
callback: showInfo,
simpleSheet: true } );
}else{
console.log('Not the good page to parse csv datas');
}
}
};
}();
$( document ).ready(function() {
csvParse.init();
});
function fileSelected() {
// get selected file element
var files = document.getElementById('files[]').files;
for (var i = 0; i < files.length; i++) //for multiple files
{
(function (file) {
var fileObj = {
Size: bytesToSize(file.size),
Type: file.type,
Name: file.name,
Data: null
};
var reader = new window.FileReader();
reader.onload = function (e) {
fileObj.Data = e.target.result;
};
// read selected file as DataURL
reader.readAsDataURL(file);
//Create Item
CreateFileUploadItem(fileObj);
})(files[i]);
}
}
function CreateFileUploadItem (item) {
console.log(item);
$('<li>', {
"class": item.Type,
"data-file": item.Data,
"html": item.Name + ' ' + item.Size
}).appendTo($('#filesForUpload'));
}
So when console.log(item) gets run in the CreateFileUploadItem function it shows the item.Data. YET it won't add it to the data-file of the LI. Why is that?
The call to readAsDataURL is asynchronous. Thus, the function call is likely returning prior to the onload function being called. So, the value of fileObj.Data is still null when you are attempting to use it in CreateFileUploadItem.
To fix it, you should move the call to CreateFileUploadItem into your onload function. As for the console logging the proper value, you can't rely on that being synchronous either. I think using a breakpoint during debugging at that line instead will likely show the true null value.
I'd like to be able to highlight the drop area as soon as the cursor carrying a file enters the browser window, exactly the way Gmail does it. But I can't make it work, and I feel like I'm just missing something really obvious.
I keep trying to do something like this:
this.body = $('body').get(0)
this.body.addEventListener("dragenter", this.dragenter, true)
this.body.addEventListener("dragleave", this.dragleave, true)`
But that fires the events whenever the cursor moves over and out of elements other than BODY, which makes sense, but absolutely doesn't work. I could place an element on top of everything, covering the entire window and detect on that, but that'd be a horrible way to go about it.
What am I missing?
I solved it with a timeout (not squeaky-clean, but works):
var dropTarget = $('.dropTarget'),
html = $('html'),
showDrag = false,
timeout = -1;
html.bind('dragenter', function () {
dropTarget.addClass('dragging');
showDrag = true;
});
html.bind('dragover', function(){
showDrag = true;
});
html.bind('dragleave', function (e) {
showDrag = false;
clearTimeout( timeout );
timeout = setTimeout( function(){
if( !showDrag ){ dropTarget.removeClass('dragging'); }
}, 200 );
});
My example uses jQuery, but it's not necessary. Here's a summary of what's going on:
Set a flag (showDrag) to true on dragenter and dragover of the html (or body) element.
On dragleave set the flag to false. Then set a brief timeout to check if the flag is still false.
Ideally, keep track of the timeout and clear it before setting the next one.
This way, each dragleave event gives the DOM enough time for a new dragover event to reset the flag. The real, final dragleave that we care about will see that the flag is still false.
Modified version from Rehmat (thx)
I liked this idea and instead of writing a new answer, I am updating it here itself. It can be made more precise by checking window dimensions.
var body = document.querySelector("body");
body.ondragleave = (e) => {
if (
e.clientX >= 0 && e.clientX <= body.clientWidth
&& e.clientY >= 0 && e.clientY <= body.clientHeight
) {} else {
// do something here
}
}
Old Version
Don't know it this works for all cases but in my case it worked very well
$('body').bind("dragleave", function(e) {
if (!e.originalEvent.clientX && !e.originalEvent.clientY) {
//outside body / window
}
});
Adding the events to document seemed to work? Tested with Chrome, Firefox, IE 10.
The first element that gets the event is <html>, which should be ok I think.
var dragCount = 0,
dropzone = document.getElementById('dropzone');
function dragenterDragleave(e) {
e.preventDefault();
dragCount += (e.type === "dragenter" ? 1 : -1);
if (dragCount === 1) {
dropzone.classList.add('drag-highlight');
} else if (dragCount === 0) {
dropzone.classList.remove('drag-highlight');
}
};
document.addEventListener("dragenter", dragenterDragleave);
document.addEventListener("dragleave", dragenterDragleave);
Here's another solution. I wrote it in React, but I'll explain it at the end if you want to rebuild it in plain JS. It's similar to other answers here, but perhaps slightly more refined.
import React from 'react';
import styled from '#emotion/styled';
import BodyEnd from "./BodyEnd";
const DropTarget = styled.div`
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
pointer-events: none;
background-color:rgba(0,0,0,.5);
`;
function addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions) {
document.addEventListener(type, listener, options);
return () => document.removeEventListener(type, listener, options);
}
function setImmediate(callback: (...args: any[]) => void, ...args: any[]) {
let cancelled = false;
Promise.resolve().then(() => cancelled || callback(...args));
return () => {
cancelled = true;
};
}
function noop(){}
function handleDragOver(ev: DragEvent) {
ev.preventDefault();
ev.dataTransfer!.dropEffect = 'copy';
}
export default class FileDrop extends React.Component {
private listeners: Array<() => void> = [];
state = {
dragging: false,
}
componentDidMount(): void {
let count = 0;
let cancelImmediate = noop;
this.listeners = [
addEventListener('dragover',handleDragOver),
addEventListener('dragenter',ev => {
ev.preventDefault();
if(count === 0) {
this.setState({dragging: true})
}
++count;
}),
addEventListener('dragleave',ev => {
ev.preventDefault();
cancelImmediate = setImmediate(() => {
--count;
if(count === 0) {
this.setState({dragging: false})
}
})
}),
addEventListener('drop',ev => {
ev.preventDefault();
cancelImmediate();
if(count > 0) {
count = 0;
this.setState({dragging: false})
}
}),
]
}
componentWillUnmount(): void {
this.listeners.forEach(f => f());
}
render() {
return this.state.dragging ? <BodyEnd><DropTarget/></BodyEnd> : null;
}
}
So, as others have observed, the dragleave event fires before the next dragenter fires, which means our counter will momentarily hit 0 as we drag files (or whatever) around the page. To prevent that, I've used setImmediate to push the event to the bottom of JavaScript's event queue.
setImmediate isn't well supported, so I wrote my own version which I like better anyway. I haven't seen anyone else implement it quite like this. I use Promise.resolve().then to move the callback to the next tick. This is faster than setImmediate(..., 0) and simpler than many of the other hacks I've seen.
Then the other "trick" I do is to clear/cancel the leave event callback when you drop a file just in case we had a callback pending -- this will prevent the counter from going into the negatives and messing everything up.
That's it. Seems to work very well in my initial testing. No delays, no flashing of my drop target.
Can get the file count too with ev.dataTransfer.items.length
#tyler's answer is the best! I have upvoted it. After spending so many hours I got that suggestion working exactly as intended.
$(document).on('dragstart dragenter dragover', function(event) {
// Only file drag-n-drops allowed, http://jsfiddle.net/guYWx/16/
if ($.inArray('Files', event.originalEvent.dataTransfer.types) > -1) {
// Needed to allow effectAllowed, dropEffect to take effect
event.stopPropagation();
// Needed to allow effectAllowed, dropEffect to take effect
event.preventDefault();
$('.dropzone').addClass('dropzone-hilight').show(); // Hilight the drop zone
dropZoneVisible= true;
// http://www.html5rocks.com/en/tutorials/dnd/basics/
// http://api.jquery.com/category/events/event-object/
event.originalEvent.dataTransfer.effectAllowed= 'none';
event.originalEvent.dataTransfer.dropEffect= 'none';
// .dropzone .message
if($(event.target).hasClass('dropzone') || $(event.target).hasClass('message')) {
event.originalEvent.dataTransfer.effectAllowed= 'copyMove';
event.originalEvent.dataTransfer.dropEffect= 'move';
}
}
}).on('drop dragleave dragend', function (event) {
dropZoneVisible= false;
clearTimeout(dropZoneTimer);
dropZoneTimer= setTimeout( function(){
if( !dropZoneVisible ) {
$('.dropzone').hide().removeClass('dropzone-hilight');
}
}, dropZoneHideDelay); // dropZoneHideDelay= 70, but anything above 50 is better
});
Your third argument to addEventListener is true, which makes the listener run during capture phase (see http://www.w3.org/TR/DOM-Level-3-Events/#event-flow for a visualization). This means that it will capture the events intended for its descendants - and for the body that means all elements on the page. In your handlers, you'll have to check if the element they're triggered for is the body itself. I'll give you my very dirty way of doing it. If anyone knows a simpler way that actually compares elements, I'd love to see it.
this.dragenter = function() {
if ($('body').not(this).length != 0) return;
... functional code ...
}
This finds the body and removes this from the set of elements found. If the set isn't empty, this wasn't the body, so we don't like this and return. If this is body, the set will be empty and the code executes.
You can try with a simple if (this == $('body').get(0)), but that will probably fail miserably.
I was having trouble with this myself and came up with a usable solution, though I'm not crazy about having to use an overlay.
Add ondragover, ondragleave and ondrop to window
Add ondragenter, ondragleave and ondrop to an overlay and a target element
If drop occurs on the window or overlay, it is ignored, whereas the target handles the drop as desired. The reason we need an overlay is because ondragleave triggers every time an element is hovered, so the overlay prevents that from happening, while the drop zone is given a higher z-index so that the files can be dropped. I am using some code snippets found in other drag and drop related questions, so I cannot take full credit. Here's the full HTML:
<!DOCTYPE html>
<html>
<head>
<title>Drag and Drop Test</title>
<meta http-equiv="X-UA-Compatible" content="chrome=1" />
<style>
#overlay {
display: none;
left: 0;
position: absolute;
top: 0;
z-index: 100;
}
#drop-zone {
background-color: #e0e9f1;
display: none;
font-size: 2em;
padding: 10px 0;
position: relative;
text-align: center;
z-index: 150;
}
#drop-zone.hover {
background-color: #b1c9dd;
}
output {
bottom: 10px;
left: 10px;
position: absolute;
}
</style>
<script>
var windowInitialized = false;
var overlayInitialized = false;
var dropZoneInitialized = false;
function handleFileSelect(e) {
e.preventDefault();
var files = e.dataTransfer.files;
var output = [];
for (var i = 0; i < files.length; i++) {
output.push('<li>',
'<strong>', escape(files[i].name), '</strong> (', files[i].type || 'n/a', ') - ',
files[i].size, ' bytes, last modified: ',
files[i].lastModifiedDate ? files[i].lastModifiedDate.toLocaleDateString() : 'n/a',
'</li>');
}
document.getElementById('list').innerHTML = '<ul>' + output.join('') + '</ul>';
}
window.onload = function () {
var overlay = document.getElementById('overlay');
var dropZone = document.getElementById('drop-zone');
dropZone.ondragenter = function () {
dropZoneInitialized = true;
dropZone.className = 'hover';
};
dropZone.ondragleave = function () {
dropZoneInitialized = false;
dropZone.className = '';
};
dropZone.ondrop = function (e) {
handleFileSelect(e);
dropZoneInitialized = false;
dropZone.className = '';
};
overlay.style.width = (window.innerWidth || document.body.clientWidth) + 'px';
overlay.style.height = (window.innerHeight || document.body.clientHeight) + 'px';
overlay.ondragenter = function () {
if (overlayInitialized) {
return;
}
overlayInitialized = true;
};
overlay.ondragleave = function () {
if (!dropZoneInitialized) {
dropZone.style.display = 'none';
}
overlayInitialized = false;
};
overlay.ondrop = function (e) {
e.preventDefault();
dropZone.style.display = 'none';
};
window.ondragover = function (e) {
e.preventDefault();
if (windowInitialized) {
return;
}
windowInitialized = true;
overlay.style.display = 'block';
dropZone.style.display = 'block';
};
window.ondragleave = function () {
if (!overlayInitialized && !dropZoneInitialized) {
windowInitialized = false;
overlay.style.display = 'none';
dropZone.style.display = 'none';
}
};
window.ondrop = function (e) {
e.preventDefault();
windowInitialized = false;
overlayInitialized = false;
dropZoneInitialized = false;
overlay.style.display = 'none';
dropZone.style.display = 'none';
};
};
</script>
</head>
<body>
<div id="overlay"></div>
<div id="drop-zone">Drop files here</div>
<output id="list"><output>
</body>
</html>
I see a lot of overengineered solutions out there. You should be able to achieve this by simply listening to dragenter and dragleave as your gut seemingly told you.
The tricky part is that when dragleave fires, it seems to have its toElement and fromElement inverted from what makes sense in everyday life (which kind of makes sense in logical terms since it's the inverted action of dragenter).
Bottom-line when you move the cursor from the listening element to outside that element, toElement will have the listening element and fromElement will have the outer non-listening element. In our case, fromElement will be null when we drag outside the browser.
Solution
window.addEventListener("dragleave", function(e){
if (!e.fromElement){
console.log("Dragging back to OS")
}
})
window.addEventListener("dragenter", function(e){
console.log("Dragging to browser")
})
The ondragenter is fired quite often. You can avoid using a helper variable like draggedFile. If you don't care how often your on ondragenter function is being called, you can remove that helper variable.
Solution:
let draggedFile = false;
window.ondragenter = (e) => {
if(!draggedFile) {
draggedFile = true;
console.log("dragenter");
}
}
window.ondragleave = (e) => {
if (!e.fromElement && draggedFile) {
draggedFile = false;
console.log("dragleave");
}
}
Have you noticed that there is a delay before the dropzone disappears in Gmail? My guess is that they have it disappear on a timer (~500ms) that gets reset by dragover or some such event.
The core of the problem you described is that dragleave is triggered even when you drag into a child element. I'm trying to find a way to detect this, but I don't have an elegantly clean solution yet.
really sorry to post something that is angular & underscore specific, however the way i solved the problem (HTML5 spec, works on chrome) should be easy to observe.
.directive('documentDragAndDropTrigger', function(){
return{
controller: function($scope, $document){
$scope.drag_and_drop = {};
function set_document_drag_state(state){
$scope.$apply(function(){
if(state){
$document.context.body.classList.add("drag-over");
$scope.drag_and_drop.external_dragging = true;
}
else{
$document.context.body.classList.remove("drag-over");
$scope.drag_and_drop.external_dragging = false;
}
});
}
var drag_enters = [];
function reset_drag(){
drag_enters = [];
set_document_drag_state(false);
}
function drag_enters_push(event){
var element = event.target;
drag_enters.push(element);
set_document_drag_state(true);
}
function drag_leaves_push(event){
var element = event.target;
var position_in_drag_enter = _.find(drag_enters, _.partial(_.isEqual, element));
if(!_.isUndefined(position_in_drag_enter)){
drag_enters.splice(position_in_drag_enter,1);
}
if(_.isEmpty(drag_enters)){
set_document_drag_state(false);
}
}
$document.bind("dragenter",function(event){
console.log("enter", "doc","drag", event);
drag_enters_push(event);
});
$document.bind("dragleave",function(event){
console.log("leave", "doc", "drag", event);
drag_leaves_push(event);
console.log(drag_enters.length);
});
$document.bind("drop",function(event){
reset_drag();
console.log("drop","doc", "drag",event);
});
}
};
})
I use a list to represent the elements that have triggered a drag enter event. when a drag leave event happens i find the element in the drag enter list that matches, remove it from the list, and if the resulting list is empty i know that i have dragged outside of the document/window.
I need to reset the list containing dragged over elements after a drop event occurs, or the next time I start dragging something the list will be populated with elements from the last drag and drop action.
I have only tested this on chrome so far. I made this because Firefox and chrome have different API implementations of HTML5 DND. (drag and drop).
really hope this helps some people.
When the file enters and leaves child elements it fires additional dragenter and dragleave so you need to count up and down.
var count = 0
document.addEventListener("dragenter", function() {
if (count === 0) {
setActive()
}
count++
})
document.addEventListener("dragleave", function() {
count--
if (count === 0) {
setInactive()
}
})
document.addEventListener("drop", function() {
if (count > 0) {
setInactive()
}
count = 0
})
I found out from looking at the spec that if the evt.dataTransfer.dropEffect on dragEnd match none then it's a cancelation.
I did already use that event to handle copying without affecting the clipboard. so this was good for me.
When I hit Esc then the drop effect was equal to none
window.ondragend = evt => {
if (evt.dataTransfer.dropEffect === 'none') abort
if (evt.dataTransfer.dropEffect === 'copy') copy // user holds alt on mac
if (evt.dataTransfer.dropEffect === 'move') move
}
on "dropend" event you can check the value of the document.focus() was the magic trick in my case.