CODEWITHSUNDEEP
javascript
Sanjeev
Sanjeev

Reputation: 1097

I want to check validation of special character on key-press or key-up event on a text field which allow space,A-Z,a-z,0-9 only

I want to check validation of special character on key-press or key-up event on a text field which allow space,A-Z,a-z,0-9 only.

any idea thanks

Upvotes: 0

Views: 3605

Answers (3)

KooiInc
KooiInc

Reputation: 122956

You can find a demo of this function in this jsfiddle: 

function CommonKeyPressIsAlpha(e){
    e = e || event;
    var matched = (/[a-z]/i).test (String.fromCharCode(e.keyCode || e.which))
    document.getElementById('report').innerHTML = 
            matched ? "" : "Valid input: 'a-z' and/or 'A-Z'"
    return matched;
}

To allow digits, change (/[a-z]/i).test to (/[a-z0-9]/i).test

Upvotes: 2

gmhk
gmhk

Reputation: 15960

Following funciton snippet will help you achieve this 

Function AlphaNumericValidation(){
var oneChar = "";

for(var i = 0; i < StringSample.length; i++) {
    oneChar = StringSample.substring(i, i+1);

    if ( (oneChar < "0") || (oneChar > "9" && oneChar < "A") || (oneChar > "Z" && oneChar < "a" ) || (oneChar > "z") )
    {   
        if (isAcceptedChar(oneChar) == false)
        {
            return false;
        }
    }
}
return true;
}

Upvotes: 0

Ben Roux
Ben Roux

Reputation: 7426

Here is a very good writeup on this exact question: http://www.htmlcodetutorial.com/forms/index_famsupp_160.html

Upvotes: 0

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