How to check if number ends in .99

I’m attempting to do some validation a price field. I would like to check if the price entered into the price field ends in .99

I’ve attempted find posts about this but I can’t find examples for decimal numbers only whole numbers. I tried to check by doing price % 1 but it isnt consistent as the price increases by 10, 20 etc.

Is there a quick way to check if all numbers end in .99?

const price = 9.99

console.log(price % 1)

Answer

You can try regular expression as well. See following code for example:

function testRegex() {
  var re = /^[0-9]*[.](99)$/;
    var val = document.getElementById("inputValue").value;

    if(re.exec(val)) {
      document.getElementById("result").innerText = "Found match!!!";
    } else {
      document.getElementById("result").innerText = "Found no match!!!";
    }

}

<input type="text" id="inputValue" value="" onkeyup="testRegex()" />
<div id="result"></div>