what executes in html form in hidden element value

Question

i have a hidden element in html form

<input type="hidden" name="Something" id="Something" value="<?php echo "somevalue";?>"/>

and i have a javascript that changes that value , the question is which value vill the element get on post the "somevalue" or the javascript value

in the js function i have

<script>
function some(){
document.getElementById('Something').value="123";
}
</script>

Did you try it before asking? – sachleen Jan 16 '13 at 09:32 — sachleen, Jan 16 '13 at 09:32

score 2 · Answer 1 · answered Jan 16 '13 at 09:34

2

PHP is executed on the server when the page is 'created'. JavaScript is executed in the browser when the displayed.

So, the JavaScript is able to modify the content of the 'created' page as it is executed at a later stage. So, assuming you call some(), the value will be 123, otherwise it will be somevalue.

answered Jan 16 '13 at 09:34

Veger

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what if i disable javascript? ;) – Gung Foo Jan 16 '13 at 09:35
@GungFoo as said, if the `some()` function is *not* called (which is the case with JavaScript disabled), it will have the value set in PHP (`somevalue`) – Veger Jan 16 '13 at 09:36

score 1 · Answer 2 · answered Jan 16 '13 at 09:33

1

That depends on when the some() function gets executed. If it gets executed before the form submits, the value will be "123", else it will be "somevalue."

answered Jan 16 '13 at 09:33

Martin

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score 1 · Answer 3 · answered Feb 04 '13 at 22:04

1

First the PHP is executed, then the javascript. The javascript some() function must be called to be executed.

answered Feb 04 '13 at 22:04

score 0 · Accepted Answer · answered Jan 16 '13 at 09:32

0

it will get the value from the javascript

assuming that you have called the show() function somewhere in your code...

answered Jan 16 '13 at 09:32

denza

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score 0 · Answer 5 · answered Jan 16 '13 at 09:33

0

If you call the javascript function some() on or after after the page has been loaded the value will be the javascript value since the original value would be overwritten.

answered Jan 16 '13 at 09:33

Skami

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score 0 · Answer 6 · edited May 23 '17 at 12:12

PHP code executes to create actual page - this means when user displays the site, input has "somevalue" in value. However, once the page is on users computer, javascript can be executed by browser and change anything on the document.

Also, you should remember that any javascript code can be, unlike PHP, displayed, changed or edited by user. So do not protect your site using javascript, use PHP!

Refer to: Difference between Javascript and PHP

what executes in html form in hidden element value

6 Answers6