Client Side Database Validation

[Daveg]

Hi all,

I have a form with a text field that I need to validate against a database table. Rather than submit the form and validate the field server side, I'd prefer to validate the field dynamically, once the value is entered. There is too much data to load with the page and validate purely client side.

All I need to do is to check the field value entered exists in a table and if it does return a description for the value entered.

Is anyone aware of a mechanism where I can make a client side JS call to a server side PHP script, validate the parameters I pass and then send the result back to the client to react accordingly?

Thanks,

Dave

[_off_axis_]

here's an example of something you can use

form.php
__________________

echo "<script langauge='javascript'>
<!--

function validate() {
var string = g('field').value;
var m_remoteServer = 'validate.php?string='+string;
	var head = document.getElementsByTagName('head').item(0);
	var old  = document.getElementById('lastLoadedCmds');
	if (old) head.removeChild(old);
	script = document.createElement('script');
	script.src = m_remoteServer;
	script.type = 'text/javascript';
	script.defer = true;
	script.id = 'lastLoadedCmds';
	void(head.appendChild(script));
}



function g(o) {
var t = document.getElementById(o);
return t;
}

//-->
</script>

<div id='info'>Info from validate.php would show in here</div>
<p>
<form onsubmit=\"validate();return false;\" method=POST>
<input type=text name='field'> <input type=submit name='submit' value='send'></form>
";



validate.php
______________

do query on this page and return info using

if($database_info == $your_info){
echo "g('info').innerHTML = \"Match\";";
}else{
echo "g('info').innerHTML = \"No Match\";";
}