How to call multiple JavaScript functions in onclick event?

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Is there any way to use the onclick html attribute to call more than one JavaScript function?

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生来不讨喜

2020-11-22 07:08

One addition, for maintainable JavaScript is using a named function.

This is the example of the anonymous function:

var el = document.getElementById('id');

// example using an anonymous function (not recommended):
el.addEventListener('click', function() { alert('hello world'); });
el.addEventListener('click', function() { alert('another event') });

But imagine you have a couple of them attached to that same element and want to remove one of them. It is not possible to remove a single anonymous function from that event listener.

Instead, you can use named functions:

var el = document.getElementById('id');

// create named functions:
function alertFirst() { alert('hello world'); };
function alertSecond() { alert('hello world'); };

// assign functions to the event listeners (recommended):
el.addEventListener('click', alertFirst);
el.addEventListener('click', alertSecond);

// then you could remove either one of the functions using:
el.removeEventListener('click', alertFirst);

This also keeps your code a lot easier to read and maintain. Especially if your function is larger.

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忘了有多久

2020-11-22 07:14

Sure, simply bind multiple listeners to it.

Short cutting with jQuery

$("#id").bind("click", function() {
  alert("Event 1");
});
$(".foo").bind("click", function() {
  alert("Foo class");
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="foo" id="id">Click</div>

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别那么骄傲

2020-11-22 07:16

ES6 React

<MenuItem
  onClick={() => {
    this.props.toggleTheme();
    this.handleMenuClose();
  }}
>

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[愿得一人]

2020-11-22 07:17

I would use the element.addEventListener method to link it to a function. From that function you can call multiple functions.

The advantage I see in binding an event to a single function and then calling multiple functions is that you can perform some error checking, have some if else statements so that some functions only get called if certain criteria are met.

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隐瞒了意图╮

2020-11-22 07:17
You can compose all the functions into one and call them.Libraries like Ramdajs has a function to compose multiple functions into one.
```
<a href="#" onclick="R.compose(fn1,fn2,fn3)()">Click me To fire some functions</a>
```
or you can put the composition as a seperate function in js file and call it
```
const newFunction = R.compose(fn1,fn2,fn3);


<a href="#" onclick="newFunction()">Click me To fire some functions</a>
```
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逝去的感伤

2020-11-22 07:20

var btn = document.querySelector('#twofuns');
btn.addEventListener('click',method1);
btn.addEventListener('click',method2);
function method2(){
  console.log("Method 2");
}
function method1(){
  console.log("Method 1");
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Pramod Kharade-Javascript</title>
</head>
<body>
<button id="twofuns">Click Me!</button>
</body>
</html>

You can achieve/call one event with one or more methods.

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