[jshint] "document.write can be a form of eval."

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January 2nd, 2013, 08:30 AM

littlebigman

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[jshint] "document.write can be a form of eval."

Hello

I'm learning JavaScript by reading "The Definitive Guide".

I saw JSHint and JSLint recommended to catch syntax errors, but I don't understand why they don't like this code:

Code:

var s = "hello world!"; // A string
var word = s.substring(s.indexOf(" ") + 1, s.length); // Use string properties
document.write(word);

Here's the report:

Quote:

Line 3: document.write(word);
document.write can be a form of eval.

Why is document.write() wrong, and what else should I use to simply output something to the browser?

Thank you.

January 2nd, 2013, 10:16 AM

AndrewSW

JavaScript is not spelt java

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document.write() should no longer be used as it is possible for a script or command to be embedded in it, which will be interpreted by the browser.

Instead, wait for the page to finish loading, and use code such as the following:

document.getElementById('someid').innerHTML = "Some text";

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January 2nd, 2013, 10:22 AM

littlebigman

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Thanks for the tip.

January 3rd, 2013, 08:48 AM

AndrewSW

JavaScript is not spelt java

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There is also JavaScript Lint which is somewhat simpler than JSLint in particular. JSLint is overly prescriptive.

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