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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?
803
To ignore HTML validation, you can remove the attribute on button click using JavaScript. Uer removeAttribute() to remove an attribute from each of the matched elements.
on('click', function(event) { var isvalidate = $("#formID")[0]. checkValidity(); if (isvalidate) { event. preventDefault(); // HERE YOU CAN PUT YOUR AJAX CALL } }); }); Code described above will allow You to use basic HTML5 validation (with type and pattern matching) WITHOUT submitting form.
Submit 's default action is to submit the data, but if you give onSubmit a value of return false , it will not be submitted; just like how we can stop a link from being followed. Of course, if there are no problems, the function call will be replaced by true and the data will be submitted. Simple...
The pattern attribute of the <input> element allows you to add basic data validation without resorting to JavaScript. It works by matching the input value against a regular expression.
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 namedinvalidthat 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
125
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