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  • Category: JavaScript

    How to allow numeric characters on keypress event?

    Are you looking for information on validation on key press event? Want to know how to allow numeric characters on key press event? Read this thread to learn more about validation on key press event with examples.

    I have a textbox for entering contact nos. which should accept only numeric values.
    How to achieve this (with proper code explanation)?
  • #727397
    Refer :

    Thanks & Regards,
    Danasegarane Arunachalam

  • #727398
    And this one

    Thanks & Regards,
    Danasegarane Arunachalam

  • #727400
    private void textBox1_TextChanged(object sender, EventArgs e)
    if (System.Text.RegularExpressions.Regex.IsMatch("[^0-9]", textBox1.Text))
    MessageBox.Show("Please enter only numbers.");
    textBox1.Text.Remove(textBox1.Text.Length - 1);

    and another way to created:
    void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    if ( !char.IsDigit(e.KeyChar) )
    e.Handled = true;

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    And Choice The Best Answers

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  • #727455
    You can use the following javascript code in the "onkeypress" event of the textbox.

    function IsNumeric() {
    var theEvent = window.event;
    var key = theEvent.keyCode;
    key = String.fromCharCode(key);

    var regex = /[0-9]|\./;
    if (!regex.test(key)) {
    theEvent.returnValue = false;
    if (theEvent.preventDefault) theEvent.preventDefault();


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