Validating form input javascript

First, we want to make sure that at least one checkbox has been checked.If there is at least one checked we want to then make sure that the user didn’t make selections that make no sense, i.e. Note that the label also displays “(required)”, to inform users that don’t use assistive technology or use older web browsers that do not support the HTML5 attribute informs assistive technologies about required controls so that they are appropriately announced to the users (as opposed to validating the input).

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You will find this type of comparison especially helpful when it comes to verifying numbers and validating character strings that should not have any numbers, such as names, for example.

Client-side validation alone does not ensure security; therefore data needs to be validated on the server-side as well.

Forms frequently include required input that needs to be clearly identified using labels.

var email Expression = /^[\w\-\.\ ] \@[a-z A-Z0-9\.\-] \.[a-z A-z0-9]$/; var telephone Expression = /^((\(\d\) ? \d-\d$/; Now for the validation script using our new expressions: // Validate email formatted properly if (Element By Id('Text Telephone').value.match(telephone Expression)) else // Validate email formatted properly if (Element By Id('Text Email').value.match(email Expression)) else As with any development project, you are always going to have those special situations that require a completely custom solution.

In our example we have created a slightly complex scenario with the favorite websites checkboxes that will require us to come up with a two-step custom validation.

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