Javascript regex for decimal validation not working

Question

<script type="text/javascript">    
function allowDecimal(txt) {
        var theEvent = txt.htmlEvent || window.event;
        var key = theEvent.keyCode || theEvent.which;
        key = String.fromCharCode(key);
        var regex = /^\d*[0-9](|.\d*[0-9]|)*$/;

        if (!regex.test(key)) {
            theEvent.returnValue = false;
            if (theEvent.preventDefault)
                theEvent.preventDefault();
        }
    }

<asp:TextBox ID="txt" runat="server" onkeypress="allowDecimal(this);"></asp:TextBox>

This is not allowing . to be entered so can some one help me what's wrong

Vijay Singh · Accepted Answer · 2013-11-14 13:42:37Z

1

try this regex

  <script type="text/javascript">    
   function allowDecimal(txt) {
    var theEvent = txt.htmlEvent || window.event;
    var key = theEvent.keyCode || theEvent.which;
    key = String.fromCharCode(key);
    var regex = /^\d*\.?\d*$/;

    if (!regex.test(key)) {
        theEvent.returnValue = false;
        if (theEvent.preventDefault)
            theEvent.preventDefault();
    }
}
</script>

answered Nov 14, 2013 at 13:42

Vijay Singh

3312 silver badges10 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Developer Over a year ago

Allowing decimal but multiple decimal points should not allow

Anup · Accepted Answer · 2013-11-14 13:43:23Z

0

you can also write like this without any regex for only one decimal validation:

var str = "hello.world"
var str2 = str.split(".");
var validate = str2.length;
if(validate != 1){
   alert("Decimal present");
}
else{
   alert("No decimal found");
}

answered Nov 14, 2013 at 13:43

Anup

3,3611 gold badge30 silver badges39 bronze badges

Comments

kennebec · Accepted Answer · 2013-11-14 14:36:42Z

0

var decimal=/^[+-]?(\d+(\.\d+)?|\.\d+)$/;

This matches an (optional) sign,

folllowed by any number of digits with an optional decimal point followed by digits,

or a decimal point followed by digits.

answered Nov 14, 2013 at 14:36

kennebec

105k32 gold badges109 silver badges127 bronze badges

Collectives™ on Stack Overflow

Javascript regex for decimal validation not working

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related