CODEWITHSUNDEEP
javascriptphp
Taimour
Taimour

Reputation: 459

Explain javascript and php code

I got this code from internet, it works correctly

<script type="text/javascript">
var jvalue = 'this is javascript value';
<?php $abc = "<script>document.write(jvalue)</script>"?>   
</script>
<?php echo  $abc;?>

But when I put the </script> at the end it stops working, kindly explain why it stops working?

<script type="text/javascript">
var jvalue = 'this is javascript value';
<?php $abc = "<script>document.write(jvalue)</script>"?>   
<?php echo  $abc;?>
</script>

Upvotes: 0

Views: 294

Answers (4)

Miles
Miles

Reputation: 283

When php echos your variable $abc, the result is approximately:

<script type="text/javascript">
    var jvalue = 'this is javascript value';
    <script>document.write(jvalue)</script> 
</script>

Which is invalid as you can't place a script tag within another script tag (aka "nest").

Removing the <script> tags from $abc should fix it.

The following would work:

<script type="text/javascript">
    var jvalue = 'this is javascript value';
    <?php $abc = "document.write(jvalue)" ?> 
    <?php echo $abc; ?> 
</script>

I'm not a PHP expert, but I would expect that if $abc is not needed elsewhere in your code, those two PHP lines can be replaced with:

<?php echo "document.write(jvalue)"; ?>

Upvotes: 1

Paul
Paul

Reputation: 735

The syntax is not correct. According to the W3 HTML specification, a script tag cannot be inside another script tag. For future debugging purposes, try putting the entire output string through a validation check (validator.w3.org). This will inform you about coding mistakes and will help you understand the errors on which you can act.

Upvotes: 1

Shaiful Islam
Shaiful Islam

Reputation: 7134

The code you got will produce html like this 

<script type="text/javascript">
 var jvalue = 'this is javascript value';

</script>
<script>
  document.write(jvalue)
</script>

But the code you changed will produce like this

<script type="text/javascript">
 var jvalue = 'this is javascript value';
   <script>
     document.write(jvalue)
   </script>
</script>

You cannot write script tag inside a script tag. That's why it producing error

Upvotes: 1

Elliott Frisch
Elliott Frisch

Reputation: 201497

Because abc is <script>document.write(jvalue)</script> and you can't nest the <script> tag. As your second example does. You could do,

<script type="text/javascript">
    var jvalue = 'this is javascript value';
    <?php $abc = "document.write(jvalue)"?>   
    <?php echo  $abc;?>
</script>

You could also do,

<?php $abc = "document.write(jvalue)"?>   
<script type="text/javascript">
    var jvalue = 'this is javascript value';
    <?php echo  $abc;?>
</script>

which I think is more in keeping with the original example.

Upvotes: 2

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