How to store a javascript function value inside a php variable

Question

function check_val(val) {
   document.getElementById("select_action")=val; 
   alert(val);
   return val;
}

this is my javascript function

<select name='select'  id='select'   onchange='check_val(this.value)'> 
<option value='0'><------select------></option>
<option value='4'>apple</option>
<option value='5'>mango</option>
<option value='6'>berry</option>
</select>
<?php <input type=hidden name='select' value=???> //by using javascript I need the value

this is my select tag now I want to put the values inside a hidden field

What does this have to do with PHP? If you want the value in a hidden input, just put it there ? — adeneo
– adeneo, Commented Aug 10, 2016 at 19:23
i want to post the values into the next page and using the javascripts i need the value — Pam
– Pam, Commented Aug 10, 2016 at 19:35

Community · Accepted Answer · 2017-05-23 12:32:56Z

1

a few things here:

to post into a different page from javascript, you could use .post(...) or $.ajax({ type: 'post',... there's an example of the latter in the answer here
hidden html inputs are useful for storing values, but they do not need to be inside php tags, which I think is what adeneo was pointing out
your hidden input does not have an id, only a name, and the name is the same as your select box
you are trying to reference something using getElementById("select_action"), but you don't have anything with that id.

edited May 23, 2017 at 12:32

CommunityBot

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answered Aug 10, 2016 at 20:04

Bobert123

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Comments

Amien · Accepted Answer · 2016-08-10 20:18:45Z

0

Pam, you don't need php at all for this, just set the value of the hidden input in your javascript function with the manipulated val

function check_val(val) {
    val++;  // do things to val (add 1) 
    document.getElementById("hidden_input").value=val; //set value in the hidden input
    return;
}

Make sure your hidden input has an ID

<select name="select" id="select" onchange="check_val(this.value)"> 
    <option value='0'><------select------></option>
    <option value='4'>apple</option>
    <option value='5'>mango</option>
    <option value='6'>berry</option>
</select>

<input id="hidden_input" type="hidden" name="hidden_input" value="0">

On the page that you are posting to, you will access the data in PHP with

echo $_POST['hidden_input'];
// or
echo $_REQUEST['hidden_input'];

edited Aug 10, 2016 at 20:18

answered Aug 10, 2016 at 20:03

Amien

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4 Comments

Pam Over a year ago

i guess it will be echo $_REQUEST['hidden_input'];

Pam Over a year ago

bt if i have mutliple submit option will i be able to make dis filed unique? because in that case it is taking only the 1st value of select that is 0

Amien Over a year ago

Yes hidden_input sorry. I'm not sure what you mean by multiple submit options?

Pam Over a year ago

i also use a button named submit it is multiple button.

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