As web developers, we want to protect the information filled out in form fields.
Bad information leads to bad user interactions, bad analytics and bad sales. Email addresses should always have the same structure: [email protected] . An email form field should check if the user has entered an email address correctly.
The Java Script class presented here makes the form validations many times easier.
The script has a catalog of almost all the common validation types built-in.
For an alternative approach to client-side form validation, without Java Script, check out our new article on HTML5 Form Validation which is available now in most modern browsers. The first test in the example is therefore only necessary in order to provide a different error message when the input is blank.
The purpose of a form validation script is to return a boolean value ( to reference form fields, but that can lead to namespace conflicts and why make things more complicated than necessary.
The idea is to create a set of “validation descriptors” associated with each element in a form.
He has over 15 years of front-end web development experience and has worked with leading interactive companies in a number of fields, from medical software to automotive media.User-submitted data should also be verified using a secure server-side script.Otherwise a browser with Java Script disabled, or a hacker trying to compromise your site, can easily by-pass client-side validation.In other words, in order to validate a field, you just associate a set of validation descriptors for each input field in the form. For such cases, a function is included which clears all validations in the validator object. Note that this validation if for fields like Textbox and multi-line text box.For ‘selections’ like drop down and radio group, use an appropriate validation like ‘dontselect’ or ‘selone_radio’.