[RESOLVED] Accessing a PHP var in JavaScript

[dcjones]

Hi all.

I am not to sure if I should be posting this here, but I have an isue with accessing a PHP var in javascript:

I have a form that when submitted validates the input on a field call "discount". If the entered value is greater that the value of the $rate, display a message, if not then submit.

This is what I am working with, should this work. No matter what value I enter into the "discount" field I get the message displayed "Promotional discount can not be greater than your agent rate"

<script language="javascript" type="text/javascript">
<!--
<?php $rate = rtrim($row_member['agentrate'], ' %');?>
function validate() {
if (document.form2.discount.value > (" <?php $rate; ?>; ")) {
	alert("Promotional discount can not be greater than your agent rate.");
	return false;
	}
if (document.form2.discount.value < 1) {
	alert("Promotional discount musat be greater than 0%.");
	return false;
	}	
	return true;
}	
//-->
</script>

[scrupul0us]

you have to echo the value of rate in the JS code, you simply just can't put the var in there (at least no without using proper, albeit depreciated, short-tag style tags)

[dcjones]

Hi scrupul0us,

Thanks for your reply.

I have inserted the "echo", I should have known better.

I am still getting the same message; "Promotional discount can not be greater than your agent rate"

If I echo the $rate var I get a result of "30" which is what I would expect so I know the var has the correct content.

Can you se any other error in my script.

<?php $rate = rtrim($row_member['agentrate'], ' %');?>
function validate() {
if (document.form2.discount.value > (" <?php echo $rate; ?>; ")) {
	alert("Promotional discount can not be greater than your agent rate.");
	return false;
	}
if (document.form2.discount.value < 1) {
	alert("Promotional discount musat be greater than 0%.");
	return false;
	}	
	return true;
}	

[bradgrafelman]

Can you paste the resulting Javascript output here?

[dcjones]

Hi bradgrafelman

Thanks for looking at this issue.

The only out put is the message box depending on what the input is.

I have a form and one of the fields holds a discount value.

Each user in the database has an agentrate filed, in this case the content is "30".

When the user edits the form and the field which holds the "discount" value, and they try to update the field with a value greater than the agentrate a message should be displayed. The issue I am having is, even if the updated value is less then the agentrate the meesage is still displayed, saying

"Promotional discount can not be greater than your agent rate"

If was just normal Javascript without PHP it would work, so I don't understand why it is not working as expected.

Any help or advice you can give would be great.

[ixalmida]

First, why are you validating with Javascript? If you aren't posting back to the server, then $rate isn't going to change. But maybe I don't get what you're trying to do.

More importantly, if $rate is a number, then:

(" <?php echo $rate; ?>; ")

is going to be compared as a string. For example, if $rate equals .75, then the Javascript statement will evaluate to:

if (document.form2.discount.value > (" .75; "))

I can't see how that statement would give you any useful results. If you eliminate the quotes and parens, you might have something:

if (document.form2.discount.value > <?php echo $rate; ?>)

would evaluate to:

if (document.form2.discount.value > .75)

[dcjones]

Hi ixalmida

Thanks for your reply, I removed the quotes and parens and I now have the result I needed.

Many thanks