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run JavaScript with out defining JavaScript

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Jul 13.2007

Cheers all,
I found this code online for preventing a form from being submitted twice via a double click. It works, but I’ve a question as to how it works since I’m not stating in code anywhere that it is JavaScript code.

Could it be the browsers are intelligent enough to know it is JS?

<input type=”submit” name=”submit” onclick=”this.disabled=true;this.value=’Submitting…’; this.form.submit();” />

I do not say anywhere, “Hey, this section is JavaScript”, so how does this work?

Thanks,

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JavaScript

3 Comments(s) ↴

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@mjdamatoJul 13.2007 — The code is simply implementing the javascrip inline. Form fields ahve built in triggers for running javascript: onsubmit, onclick, onmousedown, onmouseup, etc.
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@Orc_ScorcherJul 13.2007 — Browsers simply use JavaScript as their default scripting language (most browsers don't support any other language anyway). In theory there is a HTTP header that lets you specify the default language for your page but in reality browsers don't support it.
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@felgallJul 13.2007 — onclick is a JavaScript event handler and not an HTML attribute and so when you call the JavaScript event handler the browser knows that you want it to run JavaScript.
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