How to allow only integers in a textbox? [duplicate]

Answer 1

You can use client-side validation:

<asp:textbox onkeydown="return (!(event.keyCode>=65) && event.keyCode!=32);" />

Answer 2

You can use RegularExpressionValidator for this. below is the sample code:

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
    ControlToValidate="TextBox1" runat="server"
    ErrorMessage="Only Numbers allowed"
    ValidationExpression="\d+">
</asp:RegularExpressionValidator>

above TextBox only allowed integer to be entered because in RegularExpressionValidator has field called ValidationExpression, which validate the TextBox. However, you can modify as per your requirement.

You can see more example in MVC and Jquery here.

Answer 3

You can use RegularExpressionValidator

<asp:TextBox ID="viewTextBox" runat="server" Text="0"></asp:TextBox>
<asp:RegularExpressionValidator ID="viewRegularExpressionValidator" runat="server" ValidationExpression="[0-9]{1,50}" ControlToValidate="viewTextBox" ErrorMessage="Please Enter numbers only">*</asp:RegularExpressionValidator>

Answer 4

Easy Method:-

You can use the onkeydown Property of the TextBox for limiting its value to numbers only..

Very easy..:-)

<asp:TextBox ID="TextBox1" runat="server" onkeydown = "return (!(event.keyCode>=65) && event.keyCode!=32);"></asp:TextBox>

!(keyCode>=65) check is for excludng the Albphabets..

keyCode!=32 check is for excluding the Space character inbetween the numbers..

Answer 5

function CheckNumeric(event) {
    var _key = (window.Event) ? event.which : event.keyCode;

    if ((_key > 95 && _key < 106) || (_key > 47 && _key < 58) || _key == 8 || _key == 9 || _key == 37 || _key == 39 || _key == 190 || _key == 110) {
        return true;
    }
    else {
        return false;
    }
}

<input type="text" onkeydown="return CheckNumerick(event);" />

Accept Keys: Numbers + NumPedNumbers + Tab + "," + "." + LeftButton + RightButton + Delete + BackSpace

Answer 6

Another solution is to use a RangeValidator where you set Type="Integer" like this:

<asp:RangeValidator runat="server"
    id="valrNumberOfPreviousOwners"
    ControlToValidate="txtNumberOfPreviousOwners"
    Type="Integer"
    MinimumValue="0"
    MaximumValue="999"
    CssClass="input-error"
    ErrorMessage="Please enter a positive integer."
    Display="Dynamic">
</asp:RangeValidator>

You can set reasonable values for the MinimumValue and MaximumValue attributes too.