How to Limit Decimal Places in JavaScript Without Rounding?

How to Limit Decimal Places Without Rounding in JavaScript

When working with decimal values, it's often desirable to display them with a specific number of decimal places, even if it results in truncation. The toFixed() method, as demonstrated in the provided code snippet, rounds the value to the specified number of decimal places. However, if we want to truncate instead of rounding, we need to employ an alternative approach.

The solution lies in converting the number to a string and using a regular expression to match the desired number of decimal places:

<br>function calc(theform) {</p>
<pre class="brush:php;toolbar:false">var num = theform.original.value, rounded = theform.rounded
var with2Decimals = num.toString().match(/^-?\d+(?:\.\d{0,2})?/)[0]
rounded.value = with2Decimals

}

In this code, we:

1. Convert the number to a string using toString().
2. Use a regular expression to capture the part of the string representing the number, including up to two decimal places if any exist. The ^-?d (?:.d{0,2})? captures negative numbers (if any), digits, and up to two decimal digits.
3. Assign the truncated result to the rounded input field.

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