Validating checkbox in javascript


25-Apr-2015 05:05

Using a library to do form validation can save lots of your development time. j Query Form validation library is the most popular validation library.

This post collects all my notes and references on j Query Form validation library.

This includes a large bunch of sample code and a complete reference guide to all the built-in validation rules in the library.

$("#myemailform").validate( { rules: { fullname: { required: true }, email: { required: true, email: true } }, messages: { fullname: { required: "Please enter your name" }, email: { required: "Please enter your email address." } } }); messages: { input_1: { validation_1: "message for validation_1", validation_2: "message for validation_2" } input_2: { validation_3: "message for validation_3", validation_4: "message for validation_4" } } If you skip the message for a validation, the default message is displayed.

However, You should always customize the validation error messages.

If you imagine form as a dialog between your website and your user, the messages play an important role.

Here are some common text pattern validations: See the demo @Code Pen Doing a ‘required’ validation for a Dropdown list is a bit tricky.

validating checkbox in javascript-2

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Common validations for text field are ‘required’, minlength, maxlength or matching with a text pattern for a pattern In the example code above, $("#productform").validate( { rules: { prodid: { required: true, maxlength: 10 }, email: { required: true, email: true, minlength:10 }, address: { required: true, rangelength:[10,250] }, message: { rangelength:[50,1050] } } }); validation to mean: “the input always needs to be of x characters or more” This is for numeric inputs – when you wan to to check whether the input falls in a certain numeric range.

For example, if the input should be greater than or equal to 10 then the validation is See the demo @Code Pen Common text input patterns like email, URL, decimal number etc are available “ready to use” in the library. also contains a ‘pattern’ validation where you can give a regular expression as a parameter.



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