Google app script to construct URL from spreadsheet values and execute it - google-apps-script

Question

I am basically creating a CRM upon a spreadsheet, that is being populated by a google form.
Everytime there is a new entry, I would like to notify an external server by calling a postback URL.
So URL parameters must be taken from the spreadsheet cells of the new entry (the last row), and then executed.
Something like this:
http://www.myserver.com/script.php?value1=[lastrow.cell1]&value2=[lastrow.cell2]....
Then I need to call the URL.
How would you code it?
I Guess this script can be triggered on new line creation on the spreadsheet.

Answer 1

You can use Installable Triggers and UrlFetchApp.fetch() to automate the process of submitting a form to your spreadsheet and then sending an HTTP request to your server containing the form's values.
This is an example of how you would do it (Adapt it to your own form's questions):
// Installable trigger function
function formSubmit(e) {
// Take values from the form submitted
var channelResp = e.namedValues["Channel"];
var question1 = e.namedValues["Question 1"];
// Get values form Parameters sheet
var ss = SpreadsheetApp.getActiveSpreadsheet();
var parametersSheet = ss.getSheetByName("Parameters");
var parametersArray = parametersSheet.getRange("A2:B4").getValues();
try {
// Verify if the value in channel was well submitted and search for it
var [channel, variable] = parametersArray.find(element => element[0] == channelResp);
// Build the params with your form's answers
var params = `value1=${question1}&value2=${variable}`;
// Add the params to your url
var url = `http://www.myserver.com/script.php?${params}`;
// Make the request
UrlFetchApp.fetch(url);
} catch(e) {
// Throw an exception if the value in channel was not well-submitted
// Or there was an HTTP error
Logger.log(e);
}
}
Notice that e represents the Event Object Form Submit. Now, for setting up the installable trigger, do the following:
1) Go to your Apps Script project
2) Click Edit->Current project's triggers
3) Click "+ Add Trigger"
4) Select :
Choose which function to run -> Function Name
Select event source-> From spreadsheet
Select event type -> On form submit
5) Click Save
Restrictions
Keep in mind the Installable Trigger restrictions
Class UrlFetchApp will not work if you're executing your server as a local server because it will not be able to reach it.