I need to have this JavaScript function only output integers-CodePudding

<html>

<script>


function fahrenheitToCelcius(temp) {
    return (parseFloat(temp) - 32) * (5 / 9);
}

function isNumber(value) {
    return typeof (value) != "boolean" && !isNaN(value) && value.length > 0;
}

function minMaxTemp(value, min, max, unit) {
    console.log("function called");
    if (value.length == 0 || value == "-") return value;
    if (!isNumber(value)) return value.substring(0, value.length - 1);

    if (unit == 1) value = fahrenheitToCelcius(value);

    if (parseFloat(value) < min)
        return min;
    else if (parseFloat(value) > max)
        return max;
    else return value;

}
</script>

<table class="center">
    
      <tr>
        <th>Setpoint</th>
        <th><input id="setPoint" type="text" name="setPoint" value="4" onkeyup="this.value = minMaxTemp(this.value, -80, 150, 0)"   /></th>
       
      </tr>
</table>
</html>

the code is fucntioning for min and max values but it still outputs decimal point values which i dotn want it to doo ie 4.5
the function must only output integers ie 4 ,5, 7 not for example 4.0, 5.8, 7.6
below is the code with a web form and javascript function
thank you for any help provided

CodePudding user response：

Depending on whether you want to round down or round up, you can use Math.floor() or Math.ceil().

<th><input id="setPoint" type="text" name="setPoint" value="4" onkeyup="this.value = Math.floor(minMaxTemp(this.value, -80, 150, 0))"   /></th>

MDN docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/floor

CodePudding user response：

Since from your expected output it looks like you want the decimal numbers rounded down, I would recommend using JavaScript's Math.floor function to round the value down to the nearest integer

i.e.

Math.floor(3.712)

will return the value 3