Call jQuery function from PHP

How do I call a jQuery function from PHP?

<?php
if ($error == 1) {
?>
    <script type="text/javascript">
        error('1');
    </script>
<?
}
?>

开发者_运维问答It doesn´t work.

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No you cannot call jQuery functions from PHP. But you can generate html with PHP that will execute jQuery functions at runtime.

• Javascript is sent to the client and executed there
• PHP is compiled at the server and then sent to the client

Big difference in that

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The script tags cannot be injected directly into php tags.... But if you echo it, the script will work.... The following code works :

<?php
if( some condition ){
    echo "<script>alert('Hello World');</script>";
}
?>

In case of using jQuery, you have to wrap the code in:

jQuery(function(){
    //Your Code
});

and then echo it....

---

It depends on where you place this code fragment within the HTML output.

One of these solutions, I think, should work:

<?php
if ($error == 1) {
?>
<script type="text/javascript">
$(function() {
   error('1');
})
</script>
<?
}
?>

<?php
if ($error == 1) {
?>
<script type="text/javascript">
$(document).ready(
  function() {
    error('1');
  }
)
</script>
<?
}
?>

---

You need to specify that error('1') is a call to a jQuery function:

jQuery.error('1');
// or, uning the $ alias:
$.error('1');

---

<?php

 if(this == that) {
      //do something in php
 } else {
      //do something with jquery (i.e. fade something in/out
 }

?>

OR using jquery $.ajax to call a PHP function