What could be causing the "TypeError: this._input is null" error to be displayed in Firefox (and a similar error in Chrome) while utilizing handlebars.js on the browser?

I am currently experimenting with this code: http://jsfiddle.net/sbrsK/10/
It runs flawlessly on jsfiddle without any errors.

However, attempting to run the same code via a local web server on my computer proves unsuccessful. The following files are being loaded:

  • index.html
  • app.js

When using Firefox, I encounter this error:

TypeError: this._input is null @ http://cloud.github.com/downloads/wycats/handlebars.js/handlebars-1.0.0.beta.6.js:364

On Chrome, I receive this error message:

Uncaught TypeError:Cannot call method 'match' of null
under match = this._input.match(this.rules[rules[i]]); in handlebars-1.0.0.beta.6.js

A similar issue was previously discussed in this link, but it appears unresolved.

So, why does this error occur when everything functions correctly in jsfiddle? What is the proper method for running this code locally?

javascripthandlebars.jsjsfiddle

Answer №1

That particular error occurs when the #entry-template element is not present in the DOM at the time it is being accessed:

var source = $("#entry-template").html(); // The #entry-template element does not exist in the DOM
var template = Handlebars.compile(source);

This results in an attempt to compile undefined as a Handlebars template, which is unsuccessful. You can observe this error by executing the following:

http://jsfiddle.net/ambiguous/LprDR/

while viewing your browser's console.

The provided jsfiddle functions correctly because all code runs only after the DOM has finished loading, as per default behavior of jsfiddle.

If you are encountering this issue in your actual codebase, it likely indicates a problem with load order. Consider encapsulating your code within a $(function() { /*...*/ }) wrapper for resolution.

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