jQuery multiple events to trigger the same functio

Question

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.

Answer 1

The answer by Tatu is how I would intuitively do it, but I have experienced some problems in Internet Explorer with this way of nesting/binding the events, even though it is done through the .on() method.

I havn't been able to pinpoint exactly which versions of jQuery this is the problem with. But I sometimes see the problem in the following versions:

• 2.0.2
• 1.10.1
• 1.6.4
• Mobile 1.3.0b1
• Mobile 1.4.2
• Mobile 1.2.0

My workaround have been to first define the function,

function myFunction() {
    ...
}

and then handle the events individually

// Call individually due to IE not handling binds properly
$(window).on("scroll", myFunction);
$(window).on("resize", myFunction);

This is not the prettiest solution, but it works for me, and I thought I would put it out there to help others that might stumble upon this issue

Answer 2

If you attach the same event handler to several events, you often run into the issue of more than one of them firing at once (e.g. user presses tab after editing; keydown, change, and blur might all fire).

It sounds like what you actually want is something like this:

$('#ValidatedInput').keydown(function(evt) {
  // If enter is pressed
  if (evt.keyCode === 13) {
    evt.preventDefault();

    // If changes have been made to the input's value, 
    //  blur() will result in a change event being fired.
    this.blur();
  }
});

$('#ValidatedInput').change(function(evt) {
  var valueToValidate = this.value;

  // Your validation callback/logic here.
});

Answer 3

"Is there a way to have keyup, keypress, blur, and change events call the same function in one line?"

It's possible using .on(), which accepts the following structure: .on( events [, selector ] [, data ], handler ), so you can pass multiple events to this method. In your case it should look like this:

$('#target').on('keyup keypress blur change', function(e) {
    // "e" is an event, you can detect the type of event using "e.type"
});

And here is the live example:

$('#target').on('keyup keypress blur change', function(e) {
  console.log(`"${e.type.toUpperCase()}" event happened`)
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="target">

Answer 4

You could define the function that you would like to reuse as below:

var foo = function() {...}

And later you can set however many event listeners you want on your object to trigger that function using on('event') leaving a space in between as shown below:

$('#selector').on('keyup keypress blur change paste cut', foo);

Answer 5

You can use bind method to attach function to several events. Just pass the event names and the handler function as in this code:

$('#foo').bind('mouseenter mouseleave', function() {
  $(this).toggleClass('entered');
});

Another option is to use chaining support of jquery api.

Answer 6

$("element").on("event1 event2 event..n", function() {
   //execution
});

This tutorial is about handling multiple events.