How to execute system command in java script?

Question

I have one utility in php and want to be executed on pressing button in javascript.

Button in HTML:

<button id ="back">Zoom-Out</button></td>

JS code:

   $("#back").click(function() {

                exec ("php recordgenerator.php 0");   /*generate sample.json   */             
                $.getJSON('sample.json', function(data) {
                        options.series = data;
                        chart = new Highcharts.Chart(options);
                });
        });

But exec is not working in javascript. How can i execute php scirpt to update the chart?

Quentin · Accepted Answer · 2015-10-15 15:45:35Z

3

JavaScript, in a browser, cannot execute arbitrary programs on the visitor's system. That would be a horrific security hole.

You can use the XMLHttpRequest object to make an HTTP request to a server, and then have a server side program do whatever it is you wish to do.

answered Oct 15, 2015 at 15:45

Quentin

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2 Comments

logicstar Over a year ago

I am newbie can some pls post an example here

Quentin Over a year ago

Writing introductory tutorials for either of XMLHttpRequest or for server side programming would be too broad a subject for a stackoverflow answer.

Lee Jenkins · Accepted Answer · 2015-10-15 15:51:27Z

2

You can read about using jQuery to execute AJAX calls here: https://api.jquery.com/jquery.get/

So for example you might write something similar to this:

$("#back").click(function() {
    $.get( "/path/to/recordgenerator.php?recordID=0", function( data ) {
      $( ".result" ).html( data );
      alert( "Load was performed." );
    });
});

Of course, you'll have to be running an HTTP server that hosts your PHP code. But I assume you have that already.

answered Oct 15, 2015 at 15:51

Lee Jenkins

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4 Comments

logicstar Over a year ago

but my function don't return anything but write on server one file sample.json. How can i read that file.

Lee Jenkins Over a year ago

In your PHP code just print the JSON string. Then your JavaScript function will receive it as the data parameter.

logicstar Over a year ago

I just checked parameter value cannot be retrieved at the other end (recordgenerator.php). I am using $_POST["recordID"] but i don't get anything.

Lee Jenkins Over a year ago

Ah, that's because you're issuing a GET command, not a POST command. Check this documentation for how to retrieve the GET parameters: php.net/manual/en/reserved.variables.get.php

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