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Only Alphabet | Only Number | No Special Character - Textboxes Javascript Keypress Code


Many times we need code urgently and we think about a place from where we can just copy & paste. This post is one of them. Here you can find code and working example of javascript code to restrict user input in textboxes. We are providing you with 4 types of textboxes and there's a link in the bottom from where you can get all the keycodes and adjust our JavaScript code as per your need if you want.


textboxes with keypress restriction, only alphabets,only number cheezycode



Only Alphabets Allowed Textbox:




Code:

function onlyAlphabets(e, t) {
    try {
        if (window.event) {
            var charCode = window.event.keyCode;
        }
        else if (e) {
            var charCode = e.which;
        }
        else { return true; }
        if ((charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123))
            return true;
        else
            return false;
    }
    catch (err) {
        alert(err.Description);
    }
}
//textbox's html


Only Number Allowed Textbox:




Code:

function onlyNumber(e, t) {
    try {
        if (window.event) {
            var charCode = window.event.keyCode;
        }
        else if (e) {
            var charCode = e.which;
        }
        else { return true; }
        if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;
        else
            return true;
    }
    catch (err) {
        alert(err.Description);
    }
}
//textbox's html


No Special Characters Allowed, Just Alphabets & Numbers



Code:

function noSpecialCharacters(e, t) {
    try {
        if (window.event) {
            var charCode = window.event.keyCode;
        }
        else if (e) {
            var charCode = e.which;
        }
        else { return true; }
        if (charCode < 48 || (charCode > 57 && charCode < 65) || (charCode > 90 && charCode < 97) || charCode > 122)
            return false;
        else
            return true;
    }
    catch (err) {
        alert(err.Description);
    }
}
//textbox's html




No Special Characters Allowed, Just Alphabets & Numbers - With Spacebar



Code:

function noSpecialCharactersPlusSpace(e, t) {
    try {
        if (window.event) {
            var charCode = window.event.keyCode;
        }
        else if (e) {
            var charCode = e.which;
        }
        else { return true; }
        if ((charCode < 48 && charCode != 32) || (charCode > 57 && charCode < 65) || (charCode > 90 && charCode < 97) || charCode > 122)
            return false;
        else
            return true;
    }
    catch (err) {
        alert(err.Description);
    }
}
//textbox's html




However, the world is so big and everyone has their own requirements. So you can tweak this code just to suit your requirements. In keypress events we are just restricting user input on the basis of the key they pressed.

Here's a reference list of all the keycodes W3Schools Link.

Let us know for any help. We would be happy to help.

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