To check for all numbers in a field To get a string contains only numbers (0-9) we use a regular expression (/^[0-9] $/) which allows only numbers.
Next, the match() method of the string object is used to match the said regular expression against the input value. HTML Code An integer with an optional leading plus( ) or minus(-) sign To get a string contains only numbers (0-9) with a optional or - sign (e.g.
Simply the validation will remove all non-digits and permit only phone numbers with 10 digits. View the example in the browser Flowchart: Validate an international phone number with country code Now, let's see how to validate a phone number with country code, either in 24-0455-9034, 21.3789.4512 or 23 1256 4587 format.Client side validation is performed by a web browser, before input is sent to a web server.All code in shared files are supplied by users, and belongs to the poster. w3are not responsible or liable for any loss or damage of any kind during the usage of provided code.More and more browsers now support the constraint validation API, and it's becoming reliable.This API consists of a set of methods and properties available on each form element.