Tips for creating JavaScript validation for the Amount input field (in the format 22.00) in an ASP.NET application

In this aspx page using ASP.NET 4.0, there is a text box where users can enter a rate. The requirement is that only numbers are allowed to be entered. For example, if the user enters 22, it should display as 22.00. If the user enters 22.5, it should display as 22.50. Please assist me in writing the code in client-side JavaScript. The current code I have is:

function Rate(evt) {
         var charCode = (evt.which) ? evt.which : event.keyCode
         if (charCode > 31 && (charCode < 48 || charCode > 57))
             return false;

         return true;
     }

The current code only allows numbers to be entered. How can I modify it to also accept a decimal point?

javascriptasp.net

Answer №1

Experience this: num.toPrecision(4);

Here's an example:

var num = 22.5;
var str = "";

if(!isNaN(num)) str = num.toPrecision(4);  //Check the action here

alert(str);

Answer №2

You might want to consider utilizing the Number.toFixed() method for this particular scenario

Answer №3

Give this code snippet a shot:

function checkDecimalNumberInput(event, element){
    event = (event) ? event : window.event;
    var key = (event.which) ? event.which : event.keyCode;
    var value = element.value;
    var length = parseInt(value.length);
    var index = parseInt(value.indexOf('.'));
    var cursorPos = getCursorPosition(element); 

    if(isNaN(value)){
        event.keyCode = 0;
        element.value = ".00";
    }
    if(key == 46){
        if(index > -1)
            event.keyCode = 0;
    }
    else if(key < 48 || key > 57)
        event.keyCode = 0;
    else{
        /* Make sure only two digits are allowed after the decimal point in the numeric field */
        if((length - index) > 2 && index > -1 && cursorPos > index)
            event.keyCode = 0;
    }
}

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