如何从外部jquery文件访问$ _POST值？

Question

I am not great at Jquery and PHP I was coding in a way that sometimes I needed my javascript variables to get php post values something like that.

var articleCategoryA2 = '<?php if(isset($_POST['A2']))echo $_POST['A2'];?>';

When I was done with the coding I wanted to get everything organized I decided to have a javascript code in one single file, but it won't interact with the embeded php code in it after I include the javascript code in the php file that gets the post values

What should I do? For being noob I haven't got a clue.

Answer 1

Javascript files won't be compiled by php so if you need a php variable passed in you need to put it in a separate script tag

<script>
  var articleCategoryA2 = '<?php if(isset($_POST['A2']))echo $_POST['A2'];?>';
</script>
<script src="app.js"></script>

Now the variable is available in app.js .

Answer 2

One approach is to initialize the variable in JavaScript, then conditionally assign the value of that variable.

So in your JavaScript file:

var articleCategoryA2; //defined, but null

...then inline within your PHP file:

<?php    
    if(isset($_POST['A2'])){
        /* if $_POST['A2'] is set, put its value into the JavaScript variable articleCategoryA2 */
        echo('            
            <script>                
                articleCategoryA2='.$_POST['A2'].';                
            </script>            
        ');        
    };    
?>

If $_POST['A2'] exists, JavaScript will set its value into articleCategoryA2 .