Executing JavaScript from PHP: A Guide to Outputting Function Calls
PHP, a server-side language, cannot directly call JavaScript functions. To achieve this, you must embed the function call within the HTML string generated by PHP.
Outputting JavaScript Function Calls
Several methods exist for embedding JavaScript function calls in PHP output:
-
Using PHP Echo:
echo '<script type="text/javascript">jsfunction();</script>';
-
Escaping from PHP to Output Mode:
// PHP code here ?> <script type="text/javascript"> jsFunction(); </script> <?php // PHP code here
Handling AJAX Responses
In your provided example, the wait() function calls wait.php through an AJAX request. To handle the response, you have options:
-
Use a JavaScript Framework:
Frameworks like jQuery simplify AJAX handling, allowing you to execute functions directly from the success callback.$.get('wait.php', {}, function(returnedData) { document.getElementById("txt").innerHTML = returnedData; someOtherFunctionYouWantToCall(); }, 'text'); -
Return Function Name from PHP:
You can have wait.php return the function name to execute in the AJAX callback.// in wait.php echo 'someOtherFunctionYouWantToCall();';
$.get('wait.php', {}, function(returnedData) { window[returnedData](); }, 'text');
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