pass javascript variable to php

[believeinsharing]

Is there any way to use javascript variable in php code?

[Mahngiel]

sorta, if you pass it's value to a php function via ajax.

[scootstah]

No. PHP has already been parsed and completed before any Javascript enters the equation.

 

However, you can send data to a PHP script from Javascript with AJAX.

[believeinsharing]

I am using select to display combo box with values from 1 to 5...

 

I wanted to use that value for "for loop" to display no of text box...

No of text boxes are depends upon what user has selected in select

 

I am not sure is this purely done by php so what i did is I use javascript to get value n then wanted to use that in php for loop.

---

<div id="divSubMenu" style="display:none">

No of submenu:

<select id="noofSubmenu" onchange="printMe()">

<option value="1">1</option>

<option value="2">2</option>

<option value="3">3</option>

<option value="4">4</option>

<option value="5">5</option>

</select>

---

 

javascript code is

 

<script type="text/javascript">

function printMe() {

var noOfSubmenu =document.getElementById('noofSubmenu').value;

//alert ("Selected option is " + noOfSubmenu);

}

</script>

---

PHP code:

<?php

echo "No of submenus are:".noOfSubmenu ;

?>

 

 

[RobertP]

You can use jQuery.post to send information from javascript to php, and use jQuery.getJSON to send data from php to javascript.

[scootstah]

and use jQuery.getJSON to send data from php to javascript.

 

You can actually throw PHP variables right into the Javascript source.

<?php $foo = 'bar'; ?>
<script type="text/javascript">
alert("<?php echo $foo; ?>");
</script>

[Mahngiel]

This plugin for jQ can simplify what you're trying to do.

 

Here's something i did with it:

// Query info
$cats = $this->games->get_cats();
$subs = $this->games->get_subs();

// Create category dropdowns
<?php if($cats):?>
<select id="cat" name="category_id">
<option value="">Game Genre</option>
<?php foreach($cats as $cat):?>
	<option value="<?php echo $cat->category_id;?>"><?php echo $cat->category_title; ?></option>
<?php endforeach; ?>
</select>
<?php endif; ?>

<?php if($subs):?>
<select id="sub" name="sub_cat_id">
<option value="">Sub Genre</option>
<?php foreach($subs as $sub):?>
	<option value="<?php echo $sub->sub_cat_id;?>" class="<?php echo $sub->setting_id;?>"><?php echo $sub->sub_cat_name; ?></option>
<?php endforeach; ?>
</select>
<?php endif; ?>

// JS code
<script type="text/javascript" >
$("#sub").chained("#cat");
</script>