Bookmarklet to save URL in Google Spreadsheet - post

Question

I want to create a simple bookmarklet, that grabs the URL of the current webpage "location.ref" and saves it in a Google Spreadsheet. After it saves it, I want to stay on the current webpage.
The only way I know of writing to Google Spreadsheet is using Google App Script. So I wrote a simple script that does just that:
function doGet(request) {
var ss = SpreadsheetApp.openByUrl( "https://docs.google.com/spreadsheet/ccc?key=<MY-SPREADSHEET-ID>");
var sheet = ss.getSheets()[0];
var headers = ["Timestamp", "url"];
var nextRow = sheet.getLastRow();
var cell = sheet.getRange('a1');
var col = 0;
for (i in headers){
if (headers[i] == "Timestamp"){
val = new Date();
} else {
val = request.parameter[headers[i]];
}
cell.offset(nextRow, col).setValue(val);
col++;
}
return ContentService.createTextOutput(request.parameter.url)
.setMimeType(ContentService.MimeType.TEXT);
}
I published this as a webapp. I wrote the bookmarklet:
<a href="javascript:(
function(){
alert(window.open('https://script.google.com/macros/s/<MYWEBAPP>/exec?url='+encodeURIComponent(location.href), '_self'));
}
)();">
BOOKMARK
</a>
So far so good. It actually works when I click on the bookmarklet, it does grab the URL of the current webpage and save it in my spreadsheet. But then, the webapp returns a text response and the bookmarklet displays the text causing me to move away from my current website.
Is there a way to ignore the response? GAS webapp script requires me to use doGet() that has to return something. Is there a way to not return anything from GAS script? Alternatively, is there a way i could use some other call to replace window.open to invoke the webapp that would allow me to store the response in a variable and ignore it?

Answer 1

I know it's been over a year but I was trying to do exactly this. It took me a while to figure out, but this works. The 1 second delay was necessary to let the script finish loading.
javascript:(function(){
my_window=window.open('https://script.google.com/macros/s/<MYWEBAPP>/exec?url='+encodeURIComponent(location.href)+'&title='+encodeURIComponent(document.title));
(window.setTimeout(function(){my_window.close();},1000));
void(0);
})();

Answer 2

Instead of using window.open you may consider sending a HTTP GET request using XMLHttpRequest.
Refer here on its usage.

Answer 3

Change _self to something else, e.g. bookmarker and it will open in a new window or tab. If you use it on many pages, they will all reuse the same tab if it keeps the same name.