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I want to allow only english characters and numbers in html input field (A-Z, a-z, 0-9 are allowed). I don't want that someone to insert special characters with copy/paste.

Eldi Ndoni
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    http://stackoverflow.com/questions/1995521/jquery-js-allow-only-numbers-letters-in-a-textfield – Shrinivas Pai Jul 21 '15 at 08:50
  • possible duplicate of [How to allow only numeric (0-9) in HTML inputbox using jQuery?](http://stackoverflow.com/questions/995183/how-to-allow-only-numeric-0-9-in-html-inputbox-using-jquery) – galath Jul 21 '15 at 08:54

3 Answers3

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If you are using new browser you can use pattern attribute like

<input type="text" pattern="[A-Za-z0-9]" required/>

or you can use js like

$("#id").keypress(function(event){
    var ew = event.which;
    if(48 <= ew && ew <= 57)
        return true;
    if(65 <= ew && ew <= 90)
        return true;
    if(97 <= ew && ew <= 122)
        return true;
    return false;
});
Vidya Sagar
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2

Check this pattern="^[\x20-\x7F]+$" At me this it work:D

<input type="text" pattern="^[\x20-\x7F]+$" >
Henryk Antoni Panas
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0

In JavaScript, create a conditional checking for ASCII values. A way to do this is var character will represent one character of the array of characters entered into the input field.

character.charCodeAt(0); will turn it into an ASCII value. Then just use < than and > than symbols to check if the ASCII values are in range of letters and numbers.

Ben Adamsky
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