c# - Add .00 to an int number using javascript - Stack Overflow

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Is it possible say a person enters an integer value 5 in a Textbox and automaticall a .00 is added in the end say 5.00

<asp:TextBox ID="txtAmountTransfer" runat="server" Width="55%" CssClass="right"></asp:TextBox>

Is it possible say a person enters an integer value 5 in a Textbox and automaticall a .00 is added in the end say 5.00

<asp:TextBox ID="txtAmountTransfer" runat="server" Width="55%" CssClass="right"></asp:TextBox>

• c#
• javascript
• asp

Share Improve this question Follow asked Dec 3, 2012 at 17:14 vinivini 4,7402424 gold badges8484 silver badges176176 bronze badges 1

• When do you want the automatic formatting to take place? When the field looses focus? – bfavaretto Commented Dec 3, 2012 at 17:46

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2 Answers 2

Sorted by: Reset to default 9

You can use .toFixed(2) which will add the zero's

see this for an example js Fiddle

@CR41G14 is correct. .toFixed(2) is all you need.

As far as where and how, I would remend using the change event on the input box as it is the least intrusive for the user. (The blur event would also not be unreasonable)

Since the value of the text field will be a string you will need to parse it as @Snuffleupagus points out. In your case, I would remend parseFloat because then your field could potentially handle the user entering 5.2 which could bee 5.20. (using parseInt you would end up with 5.00).

One additional note is recognizing that if the user types non-numeric characters (or really any value that will not parse) into the field, it will result in a display of NaN, which actually seems fairly reasonable in your case.

Using jQuery:

$('#txtAmountTransfer').change(function(){
    $(this).val(parseFloat($(this).val()).toFixed(2))
});

Similar example using native code:

var textField = document.getElementById('txtAmountTransfer');
    textField.onchange = function(){
        this.value = parseFloat(this.value).toFixed(2);     
    }

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