Validating Forms With PHP And AJAX

Using AJAX Programming and PHP Programming together, you can perform advanced client-side form validation. AJAX code can communicate with the PHP server without reloading the web page as a standard web submission. AJAX can send the data from each form field to the PHP server for advanced form field validation, cleansing, and comparisons. The PHP server can also utilize a MySQL database to extend the validation and form field data testing process.

Login and simple signup forms typically have a User Name field, a Password field, a Submit Button and sometimes a graphic blocker to prevent spambots. Each of these objects and data types can be tested and verified before login is completed. The User Name and Password can be tested for illegal characters, minimum length, maximum length, and their presence in a MySQL database. The Submit button can be disabled until other validation requirements have been met. The data entered into graphic blocker fields can be checked for behavioral inconsistencies and misuse.

When completing an Online form, such as a New Patient Questionnaire, the user can be helpfully guided toward successful completion and finally toward successful submission. As each field is completed and blurred, AJAX can retrieve PHP Validation results in the form of intelligent messaging to guide the user toward efficient field corrections. Labels, Fields, Menus and other form objects can change color to focus attention to invalid field data or incomplete fields.

The process is rather simple, even if the development of the AJAX code or PHP code is no so straight forward for non-programmers. As each form field or form object is blurred, a trigger sends the object data or associated data sets through an AJAX connector to the PHP server. The PHP server performs all the necessary validation and comparison processes based on the variable name, the variable value, and additional variables and values sent by the AJAX code to the PHP Code. The PHP Script sends the resulting data back to the AJAX connector, which receives the results. Using innerHTML and other Javascript code, the form can be manipulated to display appropriate colors, change the form data, and indicate to the user what data must be modified in which form objects for specified reasons or benefits.

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