Validate filters. 25 PHP Form Validation Snippets. Recently i have involve myself in another application development. Regular Hungred Dot Com visitors will notice that the site currently offer advertisement space through this form. But really, we as a developers are always looking for such snippets or writing them out from scratch every single time regardless of how many time we know we have store it somewhere in our laptop! Man, its really frustrating searching on Google and find all sort of solution and trying to figure out whether the regular expression implemented is expensive or complete. So i came out with an idea to ease my life a bit and other developers by putting up an article such as this for my/our references. (This can be made into a class if you like to) Validate Email We can perform an email validation through this function.
After fainted for a few seconds when i saw unreal4u finding, i decided to throw up preg_match solution instead. PHP 5.2 and above. Sanitize Email Validate Email Exist Validate Number Only Sanitize Number. Using Ajax to Validate Forms. There’s two types of validation: Simple, server-independent validation, i.e. checking email address are the right format, password and confirm password matches, etc.Server-based validation, with can be delivered with a page refresh, or live (as this tutorial will explain), i.e. for checking whether a username is taken.
What can we do? Live username checkingPassword confirmation and strengthChecking if an email address is already registeredURL validation, i.e. Basecamp’s site address checks if the URL is available (pretty much the same as username validation) So why do it? It makes the user’s experience quicker, or arguably betterIt’s not much extra work to put in place (explained below) Examples in the wild Howto As with all these tutorials, I expect that you have built your solution to the point where it works, but now we want to add our splash of JavaScript magic. In our baseline example, my requirements are: Username validation Our PHP function to validate the username reads: Markup jQuery. JavaScript Form Validation Script: More features. This is in continuation of the JavaScript Form Validation script in this page. In this page, we will see some of the advanced features of the script. Showing all the form validation errors together in a message box If you want to show all the error messages together, then just call the EnableMsgsTogether() function as shown below.
See the form validation demo Showing the form validation errors on the page itself You can display the validation errors on the page itself. Here are the steps: Create a place on the page for displaying the errors create a DIV on the page for the errors the DIV should be named as {formname}_errorloc where {formname} is the name of your form. Enable on-page error display Call the EnableOnPageErrorDisplaySingleBox() function to enable on page error display. See the form validation demo here Showing the error messages next to the input element Here are the steps: Create a place to display the error message next to the input elements call EnableOnPageErrorDisplay() Javascript form validation - doing it right. Web Matters When using Javascript for form validation, there is a right way, a wrong way, a very wrong way, and a suicidally wrong way!
Unfortunately many sites use one of the wrong ways, including even some which claim to be form-validation tutorials. This page tries to help people in the right direction. The suicidally wrong way is to have the validation in Javascript only, and not on the server. A malicious user can easily bypass it and – depending on what you are doing – may wreak havoc with your database. Apparently there have been cases of online shops shipping computers for $1 because they had no server-side validation! The very wrong (but all too common) way is to simply assume the user has Javascript.
The essence is thus that Javascript validation is always optional. Having said that, there are actually two right ways, of which the better one is hardly ever used! Acceptable: validate the entered data when the submit button is pressed. Example How it works Auto-completion problem. JavaScript Form Validation : quick and easy! Using client side JavaScript is an efficient way to validate the user input in web forms. When there are many fields in the form, the JavaScript validation becomes too complex.
The JavaScript class presented here makes the form validations many times easier. Contents How to add JavaScript Form Validation quickly First, download the JavaScript form validation script here. The script has a catalog of almost all the common validation types built-in. The idea is to create a set of “validation descriptors” associated with each element in a form. Each field in the form can have zero one or more validations. In other words, in order to validate a field, you just associate a set of validation descriptors for each input field in the form. Just Choose Validations! Simfatic Forms is a feature-rich web form maker.
Using the form validation script Include gen_validatorv4.js in your html file just before closing the HEAD tag Now, add the validations required The format of the addValidation() function is: