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This is done by using validation attributes on form elements. We've seen many of these earlier in the course, but to recap:. If the data entered in a form field follows all of the rules specified by the above attributes, it is considered valid. If not, it is considered invalid. Note : There are several errors that will prevent the form from being submitted, including a badInput , patternMismatch , rangeOverflow or rangeUnderflow , stepMismatch , tooLong or tooShort , typeMismatch , valueMissing , or a customError.
Let's start with a simple example: an input that allows you to choose whether you prefer a banana or a cherry. Find the source code on GitHub at fruit-start. The simplest HTML5 validation feature is the required attribute. To make an input mandatory, add this attribute to the element. When this attribute is set, the element matches the :required UI pseudo-class and the form won't submit, displaying an error message on submission when the input is empty.
While empty, the input will also be considered invalid, matching the :invalid UI pseudo-class. This CSS causes the input to have a red dashed border when it is invalid and a more subtle solid black border when valid. We also added a background gradient when the input is required and invalid.
Try out the new behavior in the example below:. Note : You can find this example live on GitHub as fruit-validation. Try submitting the form without a value. Note how the invalid input gets focus, a default error message "Please fill out this field" appears, and the form is prevented from being sent. The presence of the required attribute on any element that supports this attribute means the element matches the :required pseudoclass whether it has a value or not.
Regexps are quite complex, and we don't intend to teach you them exhaustively in this article. Below are some examples to give you a basic idea of how they work. There are many more possibilities that we don't cover here. For a complete list and many examples, consult our Regular expressions documentation.
Let's implement an example. Update your HTML to add a pattern attribute like this:. Note : You can find this example live on GitHub as fruit-pattern. Regular expressions are case-sensitive, but we've made it support capitalized as well as lower-case versions using an extra "Aa" pattern nested inside square brackets. At this point, try changing the value inside the pattern attribute to equal some of the examples you saw earlier, and look at how that affects the values you can enter to make the input value valid.
Try writing some of your own, and see how it goes. Make them fruit-related where possible so that your examples make sense! Specifying the email type, for example, validates the inputs value against a well-formed email address pattern or a pattern matching a comma-separated list of email addresses if it has the multiple attribute.
A field is invalid if it has a value and that value has fewer characters than the minlength value or more than the maxlength value. Browsers often don't let the user type a longer value than expected into text fields. A better user experience than just using maxlength is to also provide character count feedback in an accessible manner and let them edit their content down to size.
Let's look at another example. Create a new copy of the fruit-start. Note : You can find this example live on GitHub as fruit-length. In the above example we've not included a step attribute, so the value defaults to 1.
In this section we will look at the different ways to do this. Most browsers support the Constraint Validation API , which consists of a set of methods and properties available on the following form element DOM interfaces:.
The Constraint validation API makes the following properties available on the above elements. As you saw in the HTML5 validation constraint examples earlier, each time a user tries to submit an invalid form, the browser displays an error message. The way this message is displayed depends on the browser.
Customizing these error messages is one of the most common use cases of the constraint validation API. Let's work through a simple example of how to do this. Here we store a reference to the email input, then add an event listener to it that runs the contained code each time the value inside the input is changed. Inside the contained code, we check whether the email input's validity. If so, we call the setCustomValidity method with a custom message. This renders the input invalid, so that when you try to submit the form, submission fails and the custom error message is displayed.
If the validity. This renders the input valid, so the form will submit. Note : You can find this example live on GitHub as custom-error-message. Now that we've seen a really simple example, let's see how we can use this API to build some slightly more complex custom validation. This simple form uses the novalidate attribute to turn off the browser's automatic validation; this lets our script take control over validation. However, this doesn't disable support for the constraint validation API nor the application of CSS pseudo-classes like :valid , etc.
That means that even though the browser doesn't automatically check the validity of the form before sending its data, you can still do it yourself and style the form accordingly. Let's check these using our own code, and show a custom error message for each one. Note : A key point here is that setting the novalidate attribute on the form is what stops the form from showing its own error message bubbles, and allows us to instead display the custom error messages in the DOM in some manner of our own choosing.
Now onto some basic CSS to improve the look of the form slightly, and provide some visual feedback when the input data is invalid:. Note : You can find this example live on GitHub as detailed-custom-validation. The constraint validation API gives you a powerful tool to handle form validation, letting you have enormous control over the user interface above and beyond what you can do with HTML and CSS alone. In some cases, such as legacy browser support or custom controls , you won't be able to or won't want to use the Constraint Validation API.
As you can see, it's not that hard to build a validation system on your own. The difficult part is to make it generic enough to use both cross-platform and on any form you might create. There are many libraries available to perform form validation, such as Validate.
You've reached the end of this article, but can you remember the most important information? You can find some further tests to verify that you've retained this information before you move on — see Test your skills: Form validation. LOG IN. New User? Sign Up For Free! Forgot password? Please input a number between 1 and 10 Submit Try it Yourself ». Your message has been sent to W3Schools. W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
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