- Tags: Form, HTML Form Event
- Categories: HTML Events, HTML Reference, Reference
Quick Reference
The oninvalid event fires when an input element is invalid (e.g., if the required attribute is set and the field is empty).
Supported HTML tags:
input
<!-- HTML -->
<input id="my_input" type="text" oninvalid="my_function()" required>
// JavaScript
function my_function() {
alert('This field cannot be left blank.');
}
JavaScript
Any of the following are valid.
oninvalid
document.getElementById('my_input').oninvalid = function() {my_function()};
function my_function() {
alert('This field cannot be left blank.');
}
invalid
// method 1
document.getElementById('my_input').addEventListener('invalid', function() {
alert('This field cannot be left blank.');
});
// method 2
document.getElementById('my_input').addEventListener('invalid', my_function);
function my_function() {
alert('This field cannot be left blank.');
}
Event
| Bubbles | no |
| Can be canceled | yes |
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HTML NOTES:
- In our HTML section the term “tag” and “element” are often used interchangeably to refer to both the tag used to create a page element and the element created by the tag (
ptag =pelement = paragraph on the page) - HTML5 is not case sensitive; so
Pis the same asp,ÂH1is the same ash1 - Global attributes can be used with all HTML tags and are therefore not mentioned on every tag page
- To write clean, readable HTML code, it is best to use indentation whereas elements within elements are indented (tabbed or spaces) to create something that looks like a project outline
- The browser will automatically remove any extra spaces and lines in your HTML code when the page is displayed
- Double quotes or single quotes can be used around HTML attribute values, but when the attribute value itself contains one form of quote, it will be necessary to use the other around the attribute
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