jquery - How to bind to the submit event when HTML5 validation is used?

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jquery - How to bind to the submit event when HTML5 validation is used?

posted Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

jquery - How to bind to the submit event when HTML5 validation is used?

Using HTML5 validation...

In HTML5 browsers, validation occurs before the submit event. So if the form is invalid, the submit event never fires.

I would like to hook an event into the form submit, to fire whether the form validates or not. Here's a small example, where I'm trying to alert() when the user submits the form.

HTML:

<!DOCTYPE html>
<html>
    <head><title>Example</title></head>
    <body>
        <form>
            <input type="text" name="foo" required title="Foo field"/>
            <input type="submit"/>
        </form>
    </body>
</html>

JavaScript:

$(function() {
    $('form').submit(function() {
        alert('submit!')
    });
});

Interactive demo: http://jsfiddle.net/gCBbR/

My question is: do browsers provide an alternative event that I can bind to that will run before the validation?

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1 Reply

深蓝 · Answer 1 · 2021-10-23T19:27:16+0000

Yes, there is an event for that reason. The event is called invalid when user tries to submit the for orr when you check validity via HTML5 validation method checkValidity(). This event does not fire on blur or something like that without calling checkValidity() just because you have HTML validation attributes in your input tags. But it does fire on before form submit.

From W3C:

When the checkValidity() method is invoked, if the element is a candidate for constraint validation and does not satisfy its constraints, the user agent must fire a simple event named invalid that is cancelable (but in this case has no default action) at the element and return false. Otherwise, it must only return true without doing anything else.

For example you have this markup:

<form>
            <input type="text" name="foo" required title="Foo field"/>
            <input type="submit"/>
</form>

Then you need to call checkValidity() to fire invalid event if the input data is invalid:

document.querySelectorAll('input')[0].addEventListener('blur', function(){
        this.checkValidity();
    }, false);

document.querySelectorAll('input')[0].addEventListener('invalid', function(){
        console.log('invalid fired');
    }, false);

Look at my example here: http://jsbin.com/eluwir/2

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jquery - How to bind to the submit event when HTML5 validation is used?

jquery - How to bind to the submit event when HTML5 validation is used?

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