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    <p>To append content to a document, you should only call <code>document.write()</code> during the &lt;script>-block parsing phase.</p> <p>If you have a call to <code>document.write</code> somewhere where it executes outside that context, such as in your event handler, there is no parsing going on, so nowhere for that string <code>'foo'</code> to go.</p> <p>What should happen according to the <a href="http://docs.sun.com/source/816-6408-10/document.htm#1221642" rel="noreferrer">original JavaScript reference</a> is:</p> <blockquote> <p>Event handlers execute after the original document closes, so the write method implicitly opens a new document of mimeType text/html if you do not explicitly issue a document.open method in the event handler.</p> </blockquote> <p>That is, it assumes you've made a mistake and meant to do:</p> <pre><code>document.open('text/html'); document.write(html); </code></pre> <p>Which replaces the entire document with new content. You'll also notice that because you didn't finish that off by calling:</p> <pre><code>document.close(); </code></pre> <p>...in Firefox, the ‘loading’ throbber is still animating, expecting more content to be written to the document (but it never comes).</p> <p>In this case, you are <code>document.write()</code>ing a string:</p> <pre><code>Hello bobince! How are you today? </code></pre> <p>that is clearly not a valid HTML document. Chrome (and Safari, which behaves the same) is trying to parse it as an HTML document, but fails because it is non-whitespace text content outside the document element (&lt;html>), which is not allowed. If you put some tags in the name input:</p> <pre><code>Hello &lt;em&gt;bobince&lt;/em&gt;! How are you today? </code></pre> <p>You'll see everything outside the &lt;em> element is discarded. Firefox and IE manage to apply their “fix up text outside any element” broken-HTML-rule to save you, but Chrome doesn't.</p> <p>If you want to <code>document.write()</code> a new document, you should make sure it is indeed a complete document:</p> <pre><code>&lt;html&gt;&lt;head&gt;&lt;title&gt;Greetings&lt;/title&gt;&lt;body&gt;&lt;p&gt;Hello bobince! How are you today?&lt;/p&gt;&lt;/body&gt;&lt;/html&gt; </code></pre> <p>Or, if you want to <code>document.write()</code> a text string, you should theoretically call:</p> <pre><code>document.open('text/plain'); </code></pre> <p>before the write(). But beware, the mimetype parameter is not supported by Chrome or Safari; they'll always treat what you write as HTML.</p> <p>In any case, <strong>you probably don't want to be using this method</strong>. If you want to add to (or change) the existing page you should normally be using DOM methods, such as setting the text on a status output div, or replacing the body contents using innerHTML.</p> <p><code>document.write()</code> is needed in a few places (in particular, when you are creating a new window or frame from scratch), but otherwise it's generally the wrong thing and should be viewed with suspicion.</p>
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    1. COwow...that was a really thorough response!
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    2. COThank you thank you thank you!!! (I wish there'd be an option to give 10 votes to a single answer: I've been a whole week searching and reading on how to solve javascript execution of an ajax retrieved page replacing whole document... If only I had searched for document.write javascript execution issues on chrome before!!)
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