Check if input value is malicious

[phoenix254]

I am using jQuery and prototype libarary fro this project.

I have this code so far:

HTML:

<div id="cnt"></div> <input type ="text" id="bla" name="tct"/>
Javascript:

if(e.keycode == 13){
    var text = document.getElementById('#bla');
    text= $('#bla').val();
    //text.evaljson();
    //I put a comment because it gives me error "badly formed json string"
    $('#cnt').append(text); 
   }

When I place some code like <script> alert('hello world');</script> it gets executed.

How can I remove it?

strip tags: https://css-tricks.com/snippets/javascript/strip-html-tags-in-javascript/

[cereal]

In addition, you could use document.createTextNode():

$('form').on('change', function (e) {
    var text = $('#bla').val();
    $('#cnt').append(document.createTextNode(text));
});

Example: http://jsfiddle.net/u6pqhjzy/
Documentation: https://developer.mozilla.org/en-US/docs/Web/API/Document/createTextNode

[phoenix254]

your example giving me error of csrf. here is tht error
Forbidden (403)
CSRF verification failed. Request aborted.
More information is available with DEBUG=True.

Sounds llke an issue with form submission. You sure it.s to do with this?

[phoenix254]

i run his example and i putvalue in textbox and hit entere then there come that error. u can check urself

Take off the form tags and

$('#bla').on('change', function () {
    var text = $('#bla').val();
    $('#cnt').append(document.createTextNode(text));
});