How to call js function from php? [duplicate]

Question

I have a php page, a html button on it and there I should call a JS function with a php variable. And I get the error

the variable is not defined

Here is the code:

<body>
    <form  class="form">
    <?php
    if(file_exists('megjelenitendo.txt')){
        $mappak=array();
        $mappakdb=0;
        $megjelenitendo = fopen("megjelenitendo.txt", "r") or die("Unable to open file!");
        while(!feof($megjelenitendo)) {
             $mappak[$mappakdb]=fgets($megjelenitendo) ;
             $mappakdb++;
            }   
        fclose($megjelenitendo);
        $j=0;

        foreach(glob('*') as $filename){
            for($i=0; $i<$mappakdb;++$i){
            //echo $filename."==".$mappak[$i];echo "<br>";
            if(strtoupper($filename)==strtoupper(trim($mappak[$i]))){
             //echo '<button type="submit" id='.$i.' class="button" formaction='.$filename.' />'.$filename;//substr($filename, 3,strlen($filename));
            echo '<button type="button" id='.$i.' class="button" OnClick=mappanyitas('.trim($mappak[$i]).')>'.trim($filename).'</button>';
             echo '<br>';         
         }
             else{} 
         }
     }}

     else{
        echo "A mappa elemei:<br>";
     }
    ?>
    </form>

    <script type="text/javascript">
         function mappanyitas(filename){
            alert(filename);
        }

    </script>
</body>

Shubham · Accepted Answer · 2016-11-25 10:38:19Z

4

You can call javascript function like this :

<?php 
    echo "<script>functionName();</script>";
?>

But function should be defined already.

answered Nov 25, 2016 at 10:38

Shubham

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Comments

Peter · Accepted Answer · 2016-11-25 10:39:27Z

1

The way to get PHP variables to javascript that I tend to use is just set the variable :)

<script type="text/javascript">
var fromPHP = '<?= $phpVariable; ?>';
</script>

Ti's as simple as that.

answered Nov 25, 2016 at 10:39

Peter

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Comments

Dani · Accepted Answer · 2016-11-25 10:56:42Z

1

echo '<button type="button" id='.$i.' class="button" OnClick=mappanyitas("'.trim($mappak[$i]).'")>'.trim($filename).'</button>';

answered Nov 25, 2016 at 10:56

Dani

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Comments

Nuno Valente · Accepted Answer · 2016-11-25 10:38:46Z

0

try this line

echo '<button type="button" id='.$i.' class="button" onclick="mappanyitas('.trim($mappak[$i]).')">'.trim($filename).'</button>'

Let me know if this solved your problem!

P.S. Check the rendered page's HTML and check the button's code, to check if the variable's value was successfully injected into the code

answered Nov 25, 2016 at 10:38

Nuno Valente

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3 Comments

Dani Over a year ago

Still the same problem

Dani Over a year ago

echo '<button type="button" id='.$i.' class="button" OnClick=mappanyitas("'.trim($mappak[$i]).'")>'.trim($filename).'</button>';

Nuno Valente Over a year ago

Yes you're right! Good thinking :) Hope your problem has been solved!

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