Validating html controles

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This is done using validation attributes on form elements.

When an element is invalid, two things occur: If you want to take control over the look and feel of native error message, or if you want to deal with browsers that do not support HTML5 forms validation, there is no way but to use Java Script.

There is also Note: The formatting of phone numbers varies from country to country due to the inconsistency in lengths and formats.

As a result, the specification doesn’t define an algorithm for validating these, hence it isn’t supported web browsers at the time of writing. The pattern attribute will likely make a lot of developers, especially those working on the front-end, happy.

This attribute specifies a format (in the form of a Java Script Regular Expression) that the field value is checked against.


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