Consider an HTML element with the property margin-top: 30px.
function extractValue(margin) { /* to do */ }
var element = document.getElementById("element");
alert(extractValue(element.style.marginTop));#element {
margin-top: 30px;
}<div id="element">Some text</div>If I want to retrieve only the numerical value (without "px"), how can it be done?
Extract only the numerical values and convert them to integers
let topMargin = +element.style.marginTop.replace(/[^0-9-.]/g, '')
let marginTop = parseFloat(element.style.marginTop.replace("px",""));
Easily accomplish the following...
Below is a custom function that utilizes RegExp to identify and retrieve the first base 10 number from a given String
function findFirstNumber(inputString) {
return +inputString.replace(/^[\s\S]*?(-?(?:\d*\.)?\d+(?:e[+-]?\d+)?)[\s\S]*$/, '$1');
}
// positive
findFirstNumber('foo 123456789 bar'); // 123456789
// negative
findFirstNumber('foo -23456789 bar'); // -23456789
// decimal
findFirstNumber('foo 1234.6789 bar'); // 1234.6789
// e notation
findFirstNumber('foo 1234567e9 bar'); // 1234567000000000
findFirstNumber('foo 123456e+9 bar'); // 123456000000000
findFirstNumber('foo 123456e-9 bar'); // 0.000123456
findFirstNumber('foo 1234.6e-9 bar'); // 0.0000012346
// ignores e following number but not e notation
findFirstNumber('foo 12345678e bar'); // 12345678
// ignores subsequent decimal points
findFirstNumber('foo 1234.67.9 bar'); // 1234.678
// No numbers
findFirstNumber('foo bar'); // NaN
Therefore, in your specific scenario
var topMargin = findFirstNumber(elem.style.marginTop); // 30
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