Asked  7 Months ago    Answers:  5   Viewed   42 times

Is there a way to have keyup, keypress, blur, and change events call the same function in one line or do I have to do them separately?

The problem I have is that I need to validate some data with a db lookup and would like to make sure validation is not missed in any case, whether it is typed or pasted into the box.



You can use .on() to bind a function to multiple events:

$('#element').on('keyup keypress blur change', function(e) {
    // e.type is the type of event fired

Or just pass the function as the parameter to normal event functions:

var myFunction = function() {

Tuesday, June 1, 2021
answered 7 Months ago

Using $('#myDiv').click(function(){ is better as it follows standard event registration model. (jQuery internally uses addEventListener and attachEvent).

Basically registering an event in modern way is the unobtrusive way of handling events. Also to register more than one event listener for the target you can call addEventListener() for the same target.

var myEl = document.getElementById('myelement');

myEl.addEventListener('click', function() {
    alert('Hello world');
}, false);

myEl.addEventListener('click', function() {
    alert('Hello world again!!!');
}, false);

Why use addEventListener? (From MDN)

addEventListener is the way to register an event listener as specified in W3C DOM. Its benefits are as follows:

  • It allows adding more than a single handler for an event. This is particularly useful for DHTML libraries or Mozilla extensions that need to work well even if other libraries/extensions are used.
  • It gives you finer-grained control of the phase when the listener gets activated (capturing vs. bubbling)
  • It works on any DOM element, not just HTML elements.

More about Modern event registration ->

Other methods such as setting the HTML attributes, example:

<button onclick="alert('Hello world!')">

Or DOM element properties, example:

myEl.onclick = function(event){alert('Hello world');}; 

are old and they can be over written easily.

HTML attribute should be avoided as It makes the markup bigger and less readable. Concerns of content/structure and behavior are not well-separated, making a bug harder to find.

The problem with the DOM element properties method is that only one event handler can be bound to an element per event.

More about Traditional event handling ->

MDN Reference:

Tuesday, June 1, 2021
answered 7 Months ago

To make sure a click only actions once use this:

$(".bet").unbind().click(function() {
Tuesday, June 1, 2021
answered 7 Months ago

If you want an exact replication of jQuery's behaviour, you're probably best off digging through the jQuery source code.

If you just want to do normal event dispatching and listening, see CustomEvent for how to dispatch an event with custom data and addEventListener for how to listen to it.

Your example would probably look something like

document.addEventListener('hey', function(customEvent)
    console.log(customEvent.type + ' ' + customEvent.detail.user); // hey stackoverflow
document.dispatchEvent(new CustomEvent('hey', {'detail': {'user': 'stackoverflow'}}));
Tuesday, August 3, 2021
answered 4 Months ago

The short answer is no. You cannot bind multiple input triggers to the same function:

A function can only have a single trigger binding, and can have multiple input/output bindings.

However, you can call the same "shared" code from multiple functions by either wrapping the shared code in a helper method, or using Precompiled Functions.

Monday, October 18, 2021
answered 2 Months ago
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