Basic Validation First and foremost, the form must be double-checked to ensure that all essential fields are completed.
Validation of Data Formats Secondly, the data must be examined for correct form and value.
On the client side, AngularJS conducts form validation. AngularJS keeps track of the state of the form and input fields (input, text-area, select) and alerts the user when something goes wrong. AngularJS additionally keeps track of whether or not the input fields have been touched or updated.
Form validation necessitates the use of a validation object that contains the rules for validating your form. A validation object contains a list of form elements as well as rules for validating each field.
The needed attribute is the most basic HTML5 validation feature. Add this property to an element to make an input obligatory. When this property is set, the element inherits the:required UI pseudo-class, preventing the form from submitting and showing an error message when the input is empty.
This may be done by adding a pattern property to the 'Name' field and setting its value to the regular expression we wish to compare the data to. The and $ for the start and end of the regular expression are implied when using the pattern attribute and do not need to be provided.
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