文本框接受字符和数字或字母，但不接受数字

Question

I want a javascript validation on a textbox which can accept.

a. Characters
b. Characters with Numbers

It should not accept only numbers

For example i want something like:-

Abc123 , A7 organisation .

but I dont want like;-

333333 , 2222222 .

Also, special characters are also not allowed

I tried like below js function but it is not working

function NumersWithCharValidation() {
    var textBoxvalue = document.getElementById('txtNameOfFirm').value;
    alert(textBoxvalue);
    if (textBoxvalue.match("/^(?![0-9]*$)[a-zA-Z0-9]+$/")) {
        alert('Good to go');
    }
    else {
        alert('Only Numbers are not allowed');
    } 
}

<input id="txtNameOfFirm" runat="server" onkeypress="return NumersWithCharValidation();" maxlength="200" type="text" width="65%" />

kindly suggest what is wrong

Answer 1

change the method to

function NumersWithCharValidation(thisObj) {
    var textBoxvalue = thisObj.value;
    if ( textBoxvalue.length > 0 && isNaN( textBoxvalue ) && !textBoxvalue.match( /\W/ ) ) 
    {
        alert('Good to go');
    }
    else 
    {
        alert('Only Numbers are not allowed. Special characters are also not allowed' );
    } 
}

<input id="txtNameOfFirm" runat="server" onkeypress="return NumersWithCharValidation(this);" maxlength="200" type="text" width="65%" />

isNaN( "textBoxvalue" ) will check if the value is a pure number

textBoxvalue.match( /\\W/ ) checks if there is any special character in the value

Answer 2

How about a regex like this? Positive lookahead for letters, it works for your example inputs.

if (textBoxvalue.match("/^(?=[a-zA-Z]+)[\\w\\s,]*$/")) { alert('Good to go'); } else { alert('Only Numbers are not allowed'); }

Answer 3

This will not allow the user to type any further

jQuery("#txtNameOfFirm").keypress(function (event, ui)
{ return NumersWithCharValidation(event) });

and

function NumersWithCharValidation(evt) {

    if (jQuery("#txtNameOfFirm").val().match(/^[0-9]+$/) == null)
    { return true; } else { return false; }
}