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I am trying to pass a php variable value, through an iframe over to a javascript variable. All files are on my own server and domain.

This is my html file:

<html>
<head>
    <?php 
        $userOutput = "bob"; 
    ?>
</head>
<body>
    <p id="test123"><?=$userOutput?></p>
</body>
</html>

And in my original page i try to access the information like this: 

<iframe id="iframeId" src="http://path/to/file.html"></iframe>
<script>
   window.onload = function() {
      var iframeDoc = document.getElementById('iframeId').contentWindow.document;
      var test = iframeDoc.getElementById('test123').value;
      console.log(test);
   };
</script>

Now, i do manage to reach my content, and i have tried before to just get the value of some input field i put in my "file.html" with success, but i can't seem to reach the php variable value ("test" shows up as undefined)

RealGigex
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    After running your code it seems to work fine? In the file where your php variable is, did you save the file as a .php? – Option Feb 21 '17 at 15:40
  • It is saved as an html file and the php is sort of embedded in it. – RealGigex Feb 21 '17 at 15:44
  • so where `$userOutput` is, i saved it as say file.php and then the other file where the JS is I saved it as file2.html and all works fine? Are you able to run `phpinfo();` in your .php file. Just to be sure php is setup as it should be. – Option Feb 21 '17 at 15:45
  • just to make it clearer. I have one html file with php embedded into it (file.html) I have another html file with javascript embedded into it (file2.html) that accesses "file.html" through an iframe element. – RealGigex Feb 21 '17 at 15:50
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    Well, `file.html` should be `file.php` and file2.html can stay as it is. Anything with php in should have the `.php` extension rather than the `.html` unless you're running things like AngularJS – Option Feb 21 '17 at 15:51
  • That worked! i see the value now! would you like to provide this as an answer so i can mark it as the correct solution for my question? – RealGigex Feb 21 '17 at 15:54
  • Made it a little more in depth so have a read on the answer too. Glad you've resolved it. – Option Feb 21 '17 at 15:59

2 Answers2

1

So anything that holds php needs to go into a .php file rather than a .html

as an example:

variableStored.php:

<html>
<head>
    <?php
    $userOutput = "Frrrrrrr";
    ?>
</head>
<body>
    <p id="test123">
        <?php echo $userOutput; ?>
    </p>
</body>
</html>

Take Note: when echo'ing out, its always best to <?php echo 'something';?>

rather than <?='something'?>

Then within lets say iframe.html:

<iframe id="iframeId" src="http://siteurl/variableStored.php"></iframe>
<script>
    window.onload = function() {
        var iframeDoc = document.getElementById('iframeId').contentWindow.document;
        var test = iframeDoc.getElementById('test123').value;
        console.log(test);
    };
</script>

This will then fetch everything from variableStored.php as you want it to.

Option
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0

You could echo your variable in a Javascript variable like

<script>var test = "<?= $variable ?>";</script>

And pass the variable as GET parameter to your iframe. 

<script>
        var url = "myIframe.html?var1=" + test; 
        $('#myIframe').attr('src', url"); 
</script>

You can then retreive the info using

<script>
function getParamValue(paramName)
{
    var url = window.location.search.substring(1); //get rid of "?" in querystring
    var qArray = url.split('&'); //get key-value pairs
    for (var i = 0; i < qArray.length; i++) 
    {
        var pArr = qArray[i].split('='); //split key and value
        if (pArr[0] == paramName) 
            return pArr[1]; //return value
    }
}
</script>

I want to give credit to @Ozgur bar for his answer here. How to pass parameters through iframe from parent html?

Community
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Nicolas
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