Check for special characters

Question

I want to prevent users inputing special characters ()&<>[]{}% in the many input and text areas of our website. Which is the best way ? Users use IE8, Firefox and Chrome. The name and id in the input and textarea is dynamic. I have no control over it.

So basically, I just want a function and use the onclick event to call it. I thought :input selector would do the work. Thanks.

Please take a look at JSFIDDLE

function spCheck () {var str = $('textarea').val(); if(/^[a-zA-Z0-9- ]*$/.test(str) == false) { alert('You have entered illegal characterss. Please remove them and try again.'); }}

What is your question exactly? Your code seems to function as expected. — Halcyon
– Halcyon, Commented Nov 15, 2013 at 16:21
Sorry, if I am not clear. When a user enters illegal characters into the textarea or input box, the alert needs to pop up. I have no control of adding classes or ids. My JS Fiddle, works only on the first text area. — 19eggs
– 19eggs, Commented Nov 19, 2013 at 10:22

Tushar Gupta - curioustushar · Accepted Answer · 2013-11-15 16:37:24Z

1

Add class notSpecilChar to elements you want to check and on blur alert or keyup event.

$('.notSpecilChar').blur(function () { if (/^[a-zA-Z0-9- ]*$/.test(this.value) === false) { alert('You have entered illegal characterss. Please remove them and try again.'); } });

edited Nov 15, 2013 at 16:37

answered Nov 15, 2013 at 16:22

Tushar Gupta - curioustushar

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3 Comments

19eggs Over a year ago

Hi! Tushar, Thanks for the reply, but I cannot add any class as well, the textarea and input is generated automatically. On the client side there are buttons to input textarea, buttons, input fields..etc...

Tushar Gupta - curioustushar Over a year ago

@19eggs you have given class someclass to all textarea and textbox which is common class you can use the class.

19eggs Over a year ago

Like I said before, I have no control of adding classes and ids as they are created dynamically.

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