Why doesn't my javascript function allow dot but instead allows hyphen?

Question

I am using this code to allow only digits to type in textbox but now I want to allow . too. I modified this code but instead of allowing . it allows hyphen -.

function isNumberKeyDotAllowed(evt) {
    var charCode = evt.which ? evt.which : evt.keyCode;
    if (charCode == 46 || (48 <= charCode && charCode <= 57)) {
        return true;
    }
    else {
        return false;
    }
}

button:

<asp:TextBox runat="server" ID="txtBoxAreaSqft" OnTextChanged="txtBoxAreaSqft_TextChanged"
                                                    PlaceHolder="Enter Digits Only" onkeypress="return isNumberKeyDotAllowed(event)" Enabled="true" AutoPostBack="true" CssClass="form-control"></asp:TextBox>

charCode vs. keyCode take a look here http://stackoverflow.com/a/4285801/5433027 — Thomas, Apr 16 '16 at 11:44
Possible duplicate of [Why my code doesn't allow specific symbols?](http://stackoverflow.com/questions/36655470/why-my-code-doesnt-allow-specific-symbols) — ConnorsFan, Apr 16 '16 at 12:20

score 0 · Answer 1 · answered Apr 16 '16 at 11:42

0

Just try Once in html onKeydown instead of onKeypress might help as i thing so its updating value mismatch

answered Apr 16 '16 at 11:42

mayur

3,558
23
37

score 0 · Answer 2 · answered Apr 16 '16 at 19:50

Try this:

  <asp:TextBox ID="txt" runat="server" onkeydown="return isNumOrDot(event)" />

<script>
function isNumOrDot(e){
    var nums = [48,49,50,51,52,53,54,55,56,57,190/*dot*/,
                96,97,98,99,100,101,102,103,104,105,/*Num keys*/
                110 /*num dot*/];
    return nums.indexOf(e.which)>-1;
}
</script>

onkeydown="return... is the key.

Why doesn't my javascript function allow dot but instead allows hyphen?

2 Answers2