Form field required, JS

[jamesnotjamie]

Hi,

I'm not massively experienced with JS, but have some experience with php so can read the code reasonably well.

I'm looking to make both fields on my html form required, just a simple alert window would do the trick. I've tried a few simple examples, but they don't seem to work with my form, I think it's because I have a little JS in the form itself, which could be conflicting.

Here is my form:

<form id="two" action=" " name=form method="post">
    <input name="email" id="email" type="text" value="E-Mail" onfocus="this.value=(this.value=='E-Mail') ? '' : this.value;" onblur="this.value=(this.value=='') ? 'E-Mail' : this.value;">
    <input name="city" id="city" type="text" value="City" onfocus="this.value=(this.value=='City') ? '' : this.value;" onblur="this.value=(this.value=='') ? 'City' : this.value;">    
  	<input id="button" type="submit" value="Get Free Track">
	</form>

I would like both fields to be required, like a say, a little alert would be just fine.

The sources I read and tried (unsuccessfully) were:
JavaScript Tip: Basic Form Validation With JavaScript
The JavaScript Source: Forms: Required Fields
Use JavaScript to Check Required HTML Form Fields

Could anyone point me in the right direction?

Thanks,
James

[Darth Vader]

:unsure: You shouldn't use JavaScript for validation. It's easily removable and editable with firebug, which equals over 9000 security problems. I would submit it as a form and have a server side scripting language such as PHP validate it. But that's me. :nerd:

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