Dilip12c's Blog

Textbox to accept only numbers (digits) using jquery

How can we make a textbox which just accepts only numbers specially digits only. And, for his I come up with this solution of textbox which only accepts digits, and if you try to enter any alpha bates in it then it displays the error message with animation.

HTML Code

<input type=”text” name=”quantity” id=”quantity” /> <span id=”errmsg”></span>

As you can see above, I’ve given the name and id of textbox to “quantity” in this example.This is the textbox which only accepts numbers (digits only). You can see “span” after textbox which is used to display the error message with fading effect using jQuery.

Javascript Code

<script type="text/javascript" src="jquery.js"></script>

Now le’ts write the code in JavaScript using jQuery to accept only digits in textbox and displaying error with animation.

//when key is pressed in the textbox$(“#quantity”).keypress(function (e)
{
//if the letter is not digit then display error and don’t type anything
if( e.which!=8 && e.which!=0 && (e.which<48 || e.which>57))
{
//display error message
$(“#errmsg”).html(“Digits Only”).show().fadeOut(“slow”);
return false;
}
});

When the key is pressed, we’re using the key’s ASCII value to check which button is pressed. In first expression, delete, tab or backspace button is is checked and “8″ is the ASCII values of the Back-space. Digits are checked in the second expression. “48″ is the ASCII values of “0″ and “57″ is the ASCII values of “9″. The the ASCII values of the other digits lies between “48″ to “57″. And, if the key pressed values doesn’t lies withing these range, then we are displaying the error message with jQuery’s fading effect.

And, the “return false” statement means that this functions returns false values which means not to type anything on the text box.

Download Source Code