How to use scriptlets in HTMLOutput in Google Apps Script - html

Question

I'm loading a modal dialog with:
var html = HtmlService.createHtmlOutputFromFile('File')
.setSandboxMode(HtmlService.SandboxMode.IFRAME)
.setWidth(1000)
.setHeight(700);
SpreadsheetApp.getUi()
.showModalDialog(html, 'My Page');
Now, in File.HTML, I want to load another HTML file with CSS settings, how do I do that?
I've tried including it as in HtmlTemplate using scriptlets but it doesn't work:
<?!= include('File'); ?>
EDIT:
I have defined the include function in code.gs:
function include (file) {
return HtmlService.createTemplateFromFile(file).evaluate().getContent();
}

Answer 1

The problem is that you are using:
createHtmlOutputFromFile
instead of:
createTemplateFromFile
You need to create a template:
This is what you are seeing:
The scriptlet is not running, but being interpreted as text.
This is what you want to see:
Here is how the code should be:
Code.gs
// Use this code for Google Docs, Forms, or new Sheets.
function onOpen() {
SpreadsheetApp.getUi() // Or DocumentApp or FormApp.
.createMenu('Dialog')
.addItem('Open', 'openDialog')
.addToUi();
}
function openDialog() {
var html = HtmlService.createTemplateFromFile('index')
.evaluate();//This is necessary
SpreadsheetApp.getUi() // Or DocumentApp or FormApp.
.showModalDialog(html, 'Dialog title');
}
function include(File) {
return HtmlService.createHtmlOutputFromFile(File).getContent();
};
index.html
<?!= include('File'); ?>
Hello, world!
<input type="button" value="Close"
onclick="google.script.host.close()" />
File.html
<div>
This is a test. it worked!
</div>
Basically, you need to change:
var html = HtmlService.createHtmlOutputFromFile('index')
to:
var html = HtmlService.createTemplateFromFile('index')
Create a TEMPLATE from file.
And I also changed the code to this:
function openDialog() {
var html = HtmlService.createTemplateFromFile('index')
.evaluate()
.setSandboxMode(HtmlService.SandboxMode.IFRAME);
Original answer:
include is not something like a keyword or a built in function. You need to create a function in a .gs script file named include.
function include(filename) {
return HtmlService.createHtmlOutputFromFile(filename).getContent();
};
Also, you can't mix the HTML Service and the UI Service. I don't know if that's what you are trying to do, but I thought I'd mention it.
What you want to accomplish is describe in the documentation here:
Documentation - Best Practices