• 0

OnClick with php variable?


Question

i know that using the OnClick tag, you can change javascript variables, im trying to do the same thing but change a PHP variable..

i also want to be able to do it on the same page without the page reloading.

im sure its really really ez to do, the answer is punching me in the face and i cant figure it out.

Link to comment
https://www.neowin.net/forum/topic/580888-onclick-with-php-variable/
Share on other sites

23 answers to this question

Recommended Posts

  • 0

It depends on how you are using the variable. For example if you have this link:

<a href='somepage.php?id=value'>URL</a>. You can use Javascript to change the target href to something like somepage.php?id=another_value.

But if you wish to change the variable value from a PHP file. Then you will need to use ajax to use javascript to communicate with the file, set the new value.

  • 0
  roosevelt said:
It depends on how you are using the variable. For example if you have this link:

<a href='somepage.php?id=value'>URL</a>. You can use Javascript to change the target href to something like somepage.php?id=another_value.

But if you wish to change the variable value from a PHP file. Then you will need to use ajax to use javascript to communicate with the file, set the new value.

ya, i dont want to do variable in the address, becuase its something really simple, that im justing using for a quick fix.

like i want to change $tinyfix = 1; into $tinyfix = 2; on click.

  • 0

Since the PHP-code is executed at the server, all PHP-code has been executed, and should be considered "dead", by the time the page is loaded in your web browser.

Javascript code is executed at the client after the page has been loaded in your web browser. That's why Javascript cannot talk with PHP code.

The only solution is to reload the entire page, as roosevelt said, or parhaps a part of the page as Code.Red said. There is no other option.

  • 0
  n3Mo said:
Since the PHP-code is executed at the server, all PHP-code has been executed, and should be considered "dead", by the time the page is loaded in your web browser.

Javascript code is executed at the client after the page has been loaded in your web browser. That's why Javascript cannot talk with PHP code.

The only solution is to reload the entire page, as roosevelt said, or parhaps a part of the page as Code.Red said. There is no other option.

ya i realized that after. i also realized that i can do the thing i wanted with html i believe.... can i do an OnClick html?

p.s.

OMG NEMO! ur sig! :o i used to play that game so much on my NES when i was a kid :p

  • 0

onclick is an attribute of any HTML element and is handled by JavaScript.

&lt;h1 onclick="alert('I am going to change `'+this.innerHTML+'` to `y0 mamma!`'); this.innerHTML = 'y0 mamma!'"&gt;Some text&lt;/h1&gt;

Alternatively, you can call a JavaScript function when onclick is executed:

&lt;script type="text/javascript"&gt;
function modify_text(obj, txt)
{
	alert('I am going to change `'+obj.innerHTML+'` to `'+txt+'`');
	obj.innerHTML = txt;
}
&lt;/script&gt;
&lt;h1 onclick="modify_text(this, 'y0 mamma!');"&gt;Some text&lt;/h1&gt;

More information on the onclick Event.

  • 0

ok ill explain what im trying to do and you can try to fashion an example for me.

right now, i have a javascript were when i click a button a drop down box appears, but when it appears it pushes all the text down the page, which i dont want it to do.

so what i want to do is set the margin to 30px; (or more) and then when i click the button to make the drop down box appear, i want the margin to change to 10px; so that none of the text moves, and theres still nice spacing.

  • 0

&lt;script type="text/javascript"&gt;
function toggle_display(id)
{
    var e = document.getElementById(id);

    if(e != undefined)
    {
        if(e.style.margin == '40px')
            e.style.margin = '10px';
        else
            e.style.margin = '40px';
    }
}
&lt;/script&gt;

&lt;input type="button" onclick="toggle_display('divIDName');" value="Click me!" /&gt;

What this will do is toggle the margin from 10 to 40px. If the margin is not 40px, it will make it 40px. If it is 40px, it will reset it to 10px.

If this is not the behavior you want, then you will want to remove the if(e.style.margin == '40px') conditional and simply set the margin to 40px. I added error checking just in case the element ID you pass is invalid.

  • 0
  Mathachew said:
What this will do is toggle the margin from 10 to 40px. If the margin is not 40px, it will make it 40px. If it is 40px, it will reset it to 10px.

If this is not the behavior you want, then you will want to remove the if(e.style.margin == '40px') conditional and simply set the margin to 40px. I added error checking just in case the element ID you pass is invalid.

yes, awesome!

thanks a ton :woot:

  • 0

arg i cant get it working.

i had it partiallly working, then i messed it up somehow.

&lt;html&gt;

&lt;head&gt;
&lt;link href='css.css' type='text/css' rel='stylesheet'&gt;
&lt;/head&gt;

&lt;body&gt;


&lt;div id='themargin'&gt;

hey this should be in a box.

&lt;/div&gt;

this should be outside the box. &lt;br/&gt;&lt;br/&gt;


&lt;script type="text/javascript"&gt;
function toggle_display(id)
{
var e = document.getElementById(id);

if(e != undefined)
{
if(e.style.margin == '40px')
e.style.margin = '10px';
else
e.style.margin = '40px';
}
}
&lt;/script&gt;

&lt;input type="button" onclick="toggle_display('themargin');" value="Click me!" /&gt;

&lt;/body&gt;
&lt;/html&gt;

#themargin {
	margin:40px;
	border:1px solid orange;
	padding:5px;
}

  • 0

It's because the margin property expects something like "40px 40px 40px 40px," not just "40px." The rendering engine understands this and replaces it with the correct form.

Something like this will work:

&lt;script type="text/javascript"&gt;			
function toggle_display(id)
{
	var e = document.getElementById(id);
	if(e != undefined)
	{
		if(e.style.margin.indexOf('40px') &gt;= 0 || e.style.margin == "") 
			e.style.margin = '10px'; 
		else
			e.style.margin = '40px';
	}
}
&lt;/script&gt;

Note that in Firefox, before you tell the javascript to set the margin property, javascript thinks that the property is empty, so we also check this in the if statement. I don't exactly know why this is or if there is a better way to deal with this, but in my experience I just do it this way.

  • 0

use event listeners

Much better than using the old on* method's, no idea why people don't use them more often.

Edit:

http://developer.mozilla.org/en/docs/DOM:e...ddEventListener

And since IE, as always goes against the trend, http://developer.mozilla.org/en/docs/DOM:e...ternet_Explorer

Edit 2: Although you shouldn't run into this until you start doing more advanced things, IE also handles the event passing wrong (i.e. not what the spec says), so you'll have to add more code to do the same thing than in Mozilla or such, here's some code, it's only an extra line, but it shouldn't be needed anyway. http://www.howtocreate.co.uk/wrongWithIE/?...r=Event+Objects

Edited by The_Decryptor
This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Posts

    • I can't believe it was only two years since the last time MS raised their prices and now they think they can do it again so soon. Of course they needed to backtrack on this. I hope Nintendo is next.
    • I guess I gotta be even more specific then since I'm looking for an absolute confirmation.  The mini PC has never booted up or powered on by me. I'm assuming it'll be like buying a new PC from a store. Nothing is set up. Like absolutely nothing on the mini PC because I can't emphasize this enough. My USB drive already has Windows set up on it from my other desktop so I know it's clean. So now I connect it to the mini PC before it's even booted up or go to the desktop. I then turn on the mini PC and boot into the USB drive. I should see an existing partition. I'll delete it and then install Windows again over the entire drive. I don't necessarily want to create a separate partition. Once it installs and boots to the desktop, I'm assuming the drive is "clean" and free of any malware/viruses. Basically, this process will eliminate any potential for malware/viruses to still somehow hide in the SSD and then potentially affect me later.  I'm being very anal about this because I really don't trust anything bought from AliExpress, but the price was very tempting.  Is Windows Defender reliable? Afterwards, if I do a full scan and it doesn't find anything in the SSD and the USB drive, can I be confident the mini PC is now safe and secured to enter my banking credentials? If not, what else can I do to be absolutely certain?
    • I got an ESR Qi2 vent charger for my car and it's fantastic. It's very strong magnet and holds the phone securely over the worst potholes/roads, and my iPhone does charge. In Summer, the AC blows on the vent keeps and keeps the phone cold. In winter, I just close that vent, so it still stays cold. I agree with you on the Android front. Why not just build in the magnets like Apple does? It's frustrating to buy a case that adds magnets.
    • Hey, I've been using Windows since I was a little tyke. But for the last 15 years, I have been using Linux. I'm using EndeavourOS/Arch atm. wipe it, as in deleting anything from the SSD in the computer. Make a new partition. USB booting device should be free of malware, as long as you download it directly friom MS. Not some XYZ company.
    • "Nuking it" is slang for doing a clean install. USB installation media... delete the partition... start fresh.
  • Recent Achievements

    • Collaborator
      fernan99 earned a badge
      Collaborator
    • Collaborator
      MikeK13 earned a badge
      Collaborator
    • One Month Later
      Alexander 001 earned a badge
      One Month Later
    • One Month Later
      Antonio Barboza earned a badge
      One Month Later
    • Week One Done
      Antonio Barboza earned a badge
      Week One Done
  • Popular Contributors

    1. 1
      +primortal
      584
    2. 2
      ATLien_0
      219
    3. 3
      Michael Scrip
      173
    4. 4
      Xenon
      138
    5. 5
      +FloatingFatMan
      127
  • Tell a friend

    Love Neowin? Tell a friend!