How can I trigger the same function from multiple events with jQuery?

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

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() {
   ...
}

$('#element')
    .keyup(myFunction)
    .keypress(myFunction)
    .blur(myFunction)
    .change(myFunction)

Answer 2

As of jQuery 1.7, the .on() method is the preferred method for attaching event handlers to a document. For earlier versions, the .bind() method is used for attaching an event handler directly to elements.

$(document).on('mouseover mouseout',".brand", function () {
  $(".star").toggleClass("hovered");
})

Answer 3

I was looking for a way to get the event type when jQuery listens for several events at once, and Google put me here.

So, for those interested, event.type is my answer :

$('#element').on('keyup keypress blur change', function(event) {
    alert(event.type); // keyup OR keypress OR blur OR change
});

More info in the jQuery doc.

Answer 4

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 5

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 6

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 7

This is how i do it.

$("input[name='title']").on({
    "change keyup": function(e) {
        var slug = $(this).val().split(" ").join("-").toLowerCase();
        $("input[name='slug']").val(slug);
    },
});

Answer 8

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 9

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 10

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

This tutorial is about handling multiple events.

Answer 11

It's simple to implement this with the built-in DOM methods without a big library like jQuery, if you want, it just takes a bit more code - iterate over an array of event names, and add a listener for each:

function validate(event) {
  // ...
}

const element = document.querySelector('#element');
['keyup', 'keypress', 'blur', 'change'].forEach((eventName) => {
  element.addEventListener(eventName, validate);
});

If you'd want to mimic adding to more than 1 element:

const elements = document.querySelectorAll('.commonSelector');
['keyup', 'keypress', 'blur', 'change'].forEach((eventName) => {
  elements.forEach(element => {
      element.addEventListener(eventName, validate);
  });
});

Answer 12

Instead of:

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

You can use:

$('#element').on('input', function(e) {
    // e.type is the type of event fired
});

input is trigerred for keyup keypress blur change events even for paste!

Answer 13

But to prevent multiple triggering:

var a;
var foo = function() {
    clearTimeout(a);
    a=setTimeout(function(){
        //your code
        console.log("Runned")
    },50);
}
$('textarea').on('blur change', foo);