Javascript/PHP - PHP doesn't want to recognise it? Or am I wrong?

Joshua4550 · March 24, 2010

Ok so basically what i've done, is find the screen size using javascript, assigned it to a variable, and this must work because when i echo it it shows the proper size on the page.

I also did this with whether they have flash 8 or later, or not. should set the var to 1 if so, or 0 if not. Again, when i echo it, it shows the right number, but when i ask php if its 1, it doesnt work?

Heres the codes (Not full, but the codes appropriate)...

//$has_flash = 1 or 0
  $has_flash = '
    <script type="text/javascript">     
      if (!FlashDetect.versionAtLeast() {
        // Dont have flash 8 or later
        document.write(0);        
      } else {
        document.write(1);
      }
    </script>
  ';

Heres the code to echo it (works apparently)

<p>has flash: ' . $has_flash . '</p>

But HERES THE PROBLEM. When I do the following, it never works out.

if ($has_flash == 1) {
    $menu = '
      HAI U HAV FLASH
    '; 
  } else {
    $menu = 'U DONT HAV FLASH< I R SAD';
  }
  echo $menu;

It always goes for the else statement. WHY?

ALL help appreciated. Thanks alot

JonnoTheDev · March 24, 2010

Because Javascript is client side and php is server side. You cannot set a server side variable (php) to the value of a client side result using javascript (not without using ajax). All you are doing is assigning a string to $has_flash containing javascript code. if you echo it out it will run the javascript in the client browser.

Joshua4550 · March 24, 2010

Oh I see. So what's the best way of doing what i'm trying to achieve, do you think?

JonnoTheDev · March 24, 2010

Please explain in detail what you are trying to achieve.

Joshua4550 · March 24, 2010

A way to check whether they have flash 8 or later (which evidently can be done in javascript), but then i need to store the values in a serverside variable, so I can use them in php like you saw in the first post. I'm not sure how i'd go about doing this, especially if it needs ajax, because 'm VERY new to ajax too.

JonnoTheDev · March 24, 2010

And why do you need to store in a server side variable? If you are using the result of the test to display certain elements on the screen then this call all be acheived client side.

Joshua4550 · March 24, 2010

Hm. I suppose it could be. Would I just do this..

$flashtest = '
    <script type="text/javascript">     
      if (!FlashDetect.versionAtLeast() {
        // Dont have flash 8 or later
        document.write("U need flash 8");       
      } else {
        document.write("U have flash 8");
      }
    </script>
  ';

  echo $flashtest;

?

JonnoTheDev · March 24, 2010

Take a look at

http://www.adobe.com/products/flashplayer/download/detection_kit/

Joshua4550 · March 24, 2010

I looked at the exampe and it was pretty much what I put, yet mine doesnt echo? any idea why?

$menu = '
    <script type="text/javascript"> 
              if (!FlashDetect.versionAtLeast() {
                // Dont have flash 8 or later
                var content = \'
                  <b><font color=#FF0000>
                  Install flash 8 or later!
                  </font></b>
                \';
                document.write(content);        
              } else {
                var content = \'
                        <p>Hi, you have flash 8 or later.</p>
                \';
                document.write(content);
              }
            </script>
  ';

echo '
    <body>
      <noscript class="ERROR">Please enable JavaScript</noscript>
      <div id="main">
          ' . $menu . '	        
      </div>
    </body>
    ';

It doesnt echo though. Argh, please help xD

priti · March 24, 2010

Jquery will help you more here:

1. download jquery

2. add the <script> tags

3. $(document).ready(function() {

if (!FlashDetect.versionAtLeast() {

// Dont have flash 8 or later

$('#main').html("don't have flash 8");

} else {

$('#main').html("you have flash 8");

}

});

and you are done!!

Joshua4550 · March 24, 2010

Thanks, but may I ask why javascript alone wont write it onto my page? Because it works as so on the example by adobe.

Thanks

priti · March 24, 2010

try

$menu = '<script type="text/javascript">

if (!FlashDetect.versionAtLeast() {

// Dont have flash 8 or later

var content = "<b><font color=#FF0000>Install flash 8 or later!</font></b>";

document.write(content);

} else {

var content = "<p>Hi, you have flash 8 or later.</p>";

document.write(content);

}

</script>';

Joshua4550 · March 24, 2010

Oh, it seems to work, but when i try doing ordered lists, it doesnt work :@

Joshua4550 · March 24, 2010

Kk please help me out here, i'm stressin lol.

Heres my actual code, it won't fuckin' echo anything

$menu = '<script type="text/javascript">
              if (!FlashDetect.versionAtLeast() {
                // Dont have flash 8 or later
                var content = "<b><font color=#FF0000>HOME, TUTORIALS<br />
                  Install flash 8 or later to view the proper navigation toolbar!
                  </font></b>";
                document.write(content);       
              } else {
                var content = "<ul id=\"menu\" class=\"menu\">
                    <li>
                      <a href=\"/#\">
                        <img src=\"images/home-small.png\" class=\"small\" alt=\"HOME\"/>
    		                  <img src=\"images/home.png\" class=\"big\" alt=\"HOME\"/>
	                  <span class=\"title\">Home</span>
                      </a>
                    </li>
                    <li>
                      <a href=\"javascript:alert()\">
	                  <img src=\"images/tutorials-small.png\" class=\"small\" alt=\"TUTORIALS\"/>
	                  <img src=\"images/tutorials.png\" class=\"big\" alt=\"TUTORIALS\"/>
	                  <span class=\"title\">Tutorials</span>
                      </a>
                    </li>
                        </ul>";
                document.write(content);
              }
            </script>';

...

echo '
    <body>
      <noscript class="ERROR">Please enable JavaScript</noscript>
      <div id="main">
            ' . $menu . '	
      </div> 
    </body>
    ';

HELP!

trq · March 24, 2010

Again. PHP executes on the server while Javascript executes on the client. Hence, assigning a php variable to the output of some Javascript will not work.

If you really need this data available to you server side you will need to use Ajax and have Javascript send this data back to the server once it has executed.

Joshua4550 · March 24, 2010

Again. PHP executes on the server while Javascript executes on the client. Hence, assigning a php variable to the output of some Javascript will not work.

If you really need this data available to you server side you will need to use Ajax and have Javascript send this data back to the server once it has executed.

Therefore my script should execute the javascript script when it echos the string that contains the script, and then javascript should echo (document.write()) the infomation i wanted. This is not working , because with my script it just doesnt echo anything, but with the script that priti posted, it echos.

Please explain what's wrong with my code.

$menu = '<script type="text/javascript">
              if (!FlashDetect.versionAtLeast() {
                // Dont have flash 8 or later
                var content = "<b><font color=#FF0000>HOME, TUTORIALS<br />
                  Install flash 8 or later to view the proper navigation toolbar!
                  </font></b>";
                document.write(content);       
              } else {
                var content = "<ul id=\"menu\" class=\"menu\">
                    <li>
                      <a href=\"/#\">
                        <img src=\"images/home-small.png\" class=\"small\" alt=\"HOME\"/>
    		                  <img src=\"images/home.png\" class=\"big\" alt=\"HOME\"/>
	                  <span class=\"title\">Home</span>
                      </a>
                    </li>
                    <li>
                      <a href=\"javascript:alert()\">
	                  <img src=\"images/tutorials-small.png\" class=\"small\" alt=\"TUTORIALS\"/>
	                  <img src=\"images/tutorials.png\" class=\"big\" alt=\"TUTORIALS\"/>
	                  <span class=\"title\">Tutorials</span>
                      </a>
                    </li>
                        </ul>";
                document.write(content);
              }
            </script>';

...

echo '
    <body>
      <noscript class="ERROR">Please enable JavaScript</noscript>
      <div id="main">
            ' . $menu . '	
      </div> 
    </body>
    ';

trq · March 24, 2010

What does you html source end up looking like in your browser?

Joshua4550 · March 24, 2010

<div id="main">
            <script type="text/javascript">
              if (!FlashDetect.versionAtLeast() {
                // Dont have flash 8 or later
                var content = "<b><font color=#FF0000>HOME, TUTORIALS<br />
                  Install flash 8 or later to view the proper navigation toolbar!
                  </font></b>";
                document.write(content);       
              } else {
                var content = "<ul id=\"menu\" class=\"menu\">
                    <li>
                      <a href=\"/#\">
                        <img src=\"images/home-small.png\" class=\"small\" alt=\"HOME\"/>
    		                  <img src=\"images/home.png\" class=\"big\" alt=\"HOME\"/>
	                  <span class=\"title\">Home</span>
                      </a>
                    </li>
                    <li>
                      <a href=\"javascript:alert()\">
	                  <img src=\"images/tutorials-small.png\" class=\"small\" alt=\"TUTORIALS\"/>
	                  <img src=\"images/tutorials.png\" class=\"big\" alt=\"TUTORIALS\"/>
	                  <span class=\"title\">Tutorials</span>
                      </a>
                    </li>
                        </ul>";
                document.write(content);
              }
            </script>	        
    </div>

This would all be fine, but it still doesnt actually echo anything on the page.

trq · March 24, 2010

I would try wrapping all that code within a self executing function, its obviously not being executed.

(function () {
// your js goes here
})();

trq · March 24, 2010

Have you included the code for the FlashDetect object into your page?

Joshua4550 · March 24, 2010

Well the code posted by priti earlier works, using the same flash detection function, so I cant see how that'd make it not work.

And I used the function, still nothin'...

<script type="text/javascript">
      (function() {
              if (!FlashDetect.versionAtLeast() {
                // Dont have flash 8 or later
                var content = "<b><font color=#FF0000>HOME, TUTORIALS<br />
                  Install flash 8 or later to view the proper navigation toolbar!
                  </font></b>";
                document.write(content);       
              } else {
                var content = "<ul id=\"menu\" class=\"menu\">
                    <li>
                      <a href=\"/#\">
                        <img src=\"images/home-small.png\" class=\"small\" alt=\"HOME\"/>
    		                  <img src=\"images/home.png\" class=\"big\" alt=\"HOME\"/>
	                  <span class=\"title\">Home</span>
                      </a>
                    </li>
                    <li>
                      <a href=\"javascript:alert()\">
	                  <img src=\"images/tutorials-small.png\" class=\"small\" alt=\"TUTORIALS\"/>
	                  <img src=\"images/tutorials.png\" class=\"big\" alt=\"TUTORIALS\"/>
	                  <span class=\"title\">Tutorials</span>
                      </a>
                    </li>
                        </ul>";
                document.write(content);
              }
            }) ()
            </script>

Joshua4550 · March 24, 2010

No replies now it was moved to Javascript section -_-

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