Passing values from PHP to JavaScript

darksteel21

can anyone tech me how yo pass values from php script to javscript??

Aug 5 '08 #1

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36128

Gulzor

A simple output does the job :

[php]
<script type="text/javascript">
function hello(name) {
alert("hello "+name);
}

<?php
while ( $rec = mysql_fetch_assoc($query) ) {
echo 'hello("',$rec['firstname'],'");', "\n";
}
?>

// or

hello("<?php echo $var; ?>");

</script>
[/php]

Aug 5 '08 #2

dlite922

1,584

Expert 1GB

we usually put the echo or print line in the value of a "hidden" text box.

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<input type="hidden" name="someVar" id="someVar" value="<?php echo $myVar; ?>" />

and then you can reach it via javascript once the page has been written (remember javascript = runs on client computer, PHP executes on the server before its delivered to the client computer)

So the browser sees the page as

[HTML]

<input type="hidden" name="someVar" id="someVar" value="YOUR_MY_VAR_VALUE_HERE" />

[/HTML]

and now JavaScript can access it this way:

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alert("Value is " + document.getElementById("someVar").value);

If you're printing this value elsewhere on the page, put inside a tag and give that tag an id for example:

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<div id="container">

   <span id="someVal"><?php echo $myVal; ?></span>

</div>

and you can access that with the attribute "innerHTML" such as

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alert("Value is " + document.getElementById("someVar").innerHTML);

if you STILL don't get it, Google: "miracle".

Dan

Aug 5 '08 #3

Atli

5,058

Expert 4TB

we usually put the echo or print line in the value of a "hidden" text box.
...

Just a thought.
Do you do this just to pass the values into JavaScript?

If so, you could simply add it to the header as a global variable.
Like:

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<html>

<head>

  <title>Test stuff</title>

  <script type="text/javascript">

    // Create a var in the global scope.

    // Can be accessed by any Javascript that follows, anywhere in the page.

    var phpValue = "<?php echo $someValue; ?>";

  </script>

</head>
 
<!-- This should print the value when the page loads -->

<body onload="javascript: alert(phpValue);">

  <h1>Nothing to see here... move along</h1>

</body>

</html>

Doesn't really make sense to me to add actual HTML markup for each variable, when you can simply add it to a Javascript block.

Aug 6 '08 #4

samikhan83

i agree with atli ....

if u want to pass php value to javascript as parameter then u can do it this way...

say u have a function in javascript by name passPhpValue(parm1);

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passPhpValue(parm1)

{

alert("This is PHP value:"+parm1);

}
 
javascript:onload="passPhpValue(<?=$phpvalue?>)";

Aug 6 '08 #5

Gulzor

i agree with atli ....

if u want to pass php value to javascript as parameter then u can do it this way...

say u have a function in javascript by name passPhpValue(parm1);

passPhpValue(parm1)
{
alert("This is PHP value:"+parm1);
}

javascript:onload="passPhpValue(<?=$phpvalue?>)";

You should not use this <?=$var?> (on its way to deprecation), but this <?php echo $var; ?> instead.

Aug 6 '08 #6

Atli

5,058

Expert 4TB

You should not use this <?=$var?> (on its way to deprecation), but this <?php echo $var; ?> instead.

A good point, but the short-tags have not been made deprecated just yet.
They will still exist in PHP6, but like in PHP5, they will not be enabled by default.
To use them you must reconfigure PHP.

So, like you say, using the short-tags should be avoided at all costs. By using the standard tags <?php ... ?>, you ensure that your code will always work as expected, no matter how the server is configured.

Aug 7 '08 #7

samikhan83

A good point, but the short-tags have not been made deprecated just yet.
They will still exist in PHP6, but like in PHP5, they will not be enabled by default.
To use them you must reconfigure PHP.

So, like you say, using the short-tags should be avoided at all costs. By using the standard tags <?php ... ?>, you ensure that your code will always work as expected, no matter how the server is configured.

thanx Atli

for the information
from now on i will use <?php echo $id?> instead of <?=$id?>

Aug 7 '08 #8

MerilFernando

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 <?php  $xphp= "My PHP WORLD"; ?>   <!-- Define a PHP variable -->

<script> var xjs='My Java Script world'; </script> <!-- Define a JAVASCRIPT variable -->

<input type='hidden' id='myhtml' value='My HTML world!' > <!-- Define a HTML variable -->
 
<BR>sending PHP variable value into JAVASCRIPT <BR>

<script>

var xphp='<?php echo $xphp; ?>';

document.write(xphp);    

</script>
 
<BR>getting PHP variable value into HTML <BR>

<?php echo $xphp; ?>
 
<BR><BR>getting JAVASCRIPT  variable value into PHP <BR>

<?php

$xjs = "<script>document.write(xjs);</script>";

echo $xjs;

?>
 
<BR>getting JAVASCRIPT  variable value into HTML <BR>

<script>document.write(xjs);</script>
 
<BR><BR>getting HTML variable value into JAVASCRIPT  <BR> 

<script>

var xhtml=document.getElementById('myhtml').value;

document.write(xhtml);    

</script>
 
<BR>getting HTML variable value into PHP <BR> 

<?php

$xhtml = "<script>document.write(document.getElementById('myhtml').value);</script>";

echo $xhtml;

?>

Mar 27 '17 #9

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