Validating a web form

In other web browsers they can be used in combination with the .

Obviously neither example is very limiting, but it will prevent people from entering completely wrong values, such as phone number, strings with multiple '@'s or spaces.

For the browser-impaired, this is how the required input field will appear in Safari with either the image or the elements, but won't work for checkboxes, select elements, etc.

For those you might want to place the valid/invalid markers alongside the element or format the input elements themselves using borders, background colours, etc.

While it would be great to see something like this in every browser, for now you probably need to stick with the ubiquitous Java Script plugins. Arjen, You're correct: and it's not just the plus sign ( ), although I have to admit, I've never seen that used in an email address before.

While the code we're using is slightly more complicated, this should get you started: Some of the articles below, particularly the first two, provide other style/scripting options and solutions for supporting older browsers. Wikipedia has a list of potentially valid email formats here: en.wikipedia.org/wiki/Email_address#Valid_email_addresses Most browsers accept [email protected] as valid for email input as it can be technically correct in some situations - on an intranet for example. How do you only show the fields as 'invalid' after the user leaves (blurs? It's ugly to have ready icons displayed when the page loads.

The option of using pure HTML, sometimes with a touch of CSS, to complement Java Script form validation was until recently unthinkable.

In a few minutes you could have your whole website updated. I would highly recommend using one the various placeholder polyfill scripts if you want to support the placeholder attribute in older browsers: e.g.As shown above, once you've added HTML5 attributes to your form elements, they can be easily styled using CSS so that each input field is clearly marked as valid or invalid. If you want something more restrictive you can add a 'pattern' attribute. thx Safari doesn't display any HTML5 validation messages, but it may prevent the form from submitting if any "required" fields are left blank. The red/green symbols are applied using CSS and do work in Safari, but are only an indication of whether the input for that field is valid.input field: This solution is still more complicated than it needs to be as it requires two extra images to be loaded. You forgot the most important part: by having these standard types to identify the fields, browsers can provide helpful autofill interfaces.Like most Spring Getting Started guides, you can start from scratch and complete each step, or you can bypass basic setup steps that are already familiar to you. If you’re not familiar with either, refer to Building Java Projects with Gradle or Building Java Projects with Maven. Thymeleaf settings can be changed and overridden in a variety of ways depending on what you need to achieve, but the details are not relevant to this guide.buildscript apply plugin: 'java' apply plugin: 'eclipse' apply plugin: 'idea' apply plugin: 'org.springframework.boot' apply plugin: 'io.spring.dependency-management' boot Jar repositories source Compatibility = 1.8 target Compatibility = 1.8 dependencies First you set up a basic build script. You can run the application from the command line with Gradle or Maven.

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