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How Do You Use An External Javascript Library In A Google Apps Addon Script?

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I've been working through the example code as best I can, and I've got an addon that when you click the custom menu, it pops up a dialog based on an html file (the HtmlService clas

Solution 1:

To load external javascript, you have to use scriplets in templated HTML (partially taken from GAS documentation)

<!DOCTYPE html><html><head><basetarget="_top"><?!= include('StylesheetFileName'); ?></head><body><h1>Welcome</h1><p>Please enjoy this helpful script.</p><?!= include('JavaScriptFileName'); ?></body></html>

And in your gs code you would have something like this

functionshowDialog() {
var html = HtmlService.createTemplateFromFile('dialog')
            .evaluate()
            .setSandboxMode(HtmlService.SandboxMode.IFRAME)
            .setWidth(400)
            .setHeight(300);
        SpreadsheetApp.getUi() // Or DocumentApp or FormApp.
        .showModalDialog(html, 'Dialog Title');
}

functioninclude(filename) {
  returnHtmlService.createHtmlOutputFromFile(filename)
      .getContent();
}

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