What about something simple like:

document.getElementById('elementID').click();

Supported even by IE.

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[Edit 2022] The answer was really outdated. Simplified and modernized it.

Use element.dispatchEvent with a freshly created Event of the desired type.

Here's an example using event delegation.

Fork this stackblitz project to play around with it.

// Note: {bubbles: true} because of the event delegation ... document.addEventListener(`click`, handle); document.addEventListener(`virtualhover`, handle); // the actual 'trigger' function const trigger = (el, etype, custom) => { const evt = custom ?? new Event( etype, { bubbles: true } ); el.dispatchEvent( evt ); }; // a custom event ;) const vHover = new CustomEvent(`virtualhover`, { bubbles: true, detail: `red` }); setTimeout( _ => trigger( document.querySelector(`#testMe`), `click` ), 1000 ); function handle(evt) { if (evt.target.id === `clickTrigger`) { trigger(document.querySelector(`#testMe`), `click`); } if (evt.type === `virtualhover`) { evt.target.style.color = evt.detail; return setTimeout( _ => evt.target.style.color = ``, 1000 ); } if (evt.target.id === `testMe`) { document.querySelector(`#testMeResult`) .insertAdjacentHTML(`beforeend`, `

One of us clicked #testMe. It was ${evt.isTrusted ? `you` : `me`}.

`); trigger( document.querySelector(`#testMeResult p:last-child`), `virtualhover`, vHover ); } } body { font: 1.2rem/1.5rem verdana, arial; margin: 2rem; } #testMe { cursor: pointer; } p { margin: 0.2rem 0; }

Click #testMe

The old answer:

Here's what I cooked up. It's pretty simple, but it works: function eventFire(el, etype){ if (el.fireEvent) { el.fireEvent('on' + etype); } else { var evObj = document.createEvent('Events'); evObj.initEvent(etype, true, false); el.dispatchEvent(evObj); } }

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Have you considered using jQuery to avoid all the browser detection? With jQuery, it would be as simple as:

$("#mytest1").click();

---

var elem = document.getElementById('mytest1');

// Simulate clicking on the specified element.
triggerEvent( elem, 'click' );

/**
 * Trigger the specified event on the specified element.
 * @param  {Object} elem  the target element.
 * @param  {String} event the type of the event (e.g. 'click').
 */
function triggerEvent( elem, event ) {
  var clickEvent = new Event( event ); // Create the event.
  elem.dispatchEvent( clickEvent );    // Dispatch the event.
}

Reference

https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Creating_and_triggering_events

https://codepen.io/felquis/pen/damDA

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You could save yourself a bunch of space by using jQuery. You only need to use:

$('#myElement').trigger("click")

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The top answer is the best! However, it was not triggering mouse events for me in Firefox when etype = 'click'.

So, I changed the document.createEvent to 'MouseEvents' and that fixed the problem. The extra code is to test whether or not another bit of code was interfering with the event, and if it was cancelled I would log that to console.

function eventFire(el, etype){
  if (el.fireEvent) {
    el.fireEvent('on' + etype);
  } else {
    var evObj = document.createEvent('MouseEvents');
    evObj.initEvent(etype, true, false);
    var canceled = !el.dispatchEvent(evObj);
    if (canceled) {
      // A handler called preventDefault.
      console.log("automatic click canceled");
    } else {
      // None of the handlers called preventDefault.
    } 
  }
}

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Simulating an event is similar to creating a custom event. To simulate a mouse event

we gonna have to create MouseEvent using document.createEvent().

Then using initMouseEvent(), we've to set up the mouse event that is going to occur.

Then dispatched the mouse event on the element on which you'd like to simulate an event.

In the following code, I've used setTimeout so that the button gets clicked automatically after 1 second.

const div = document.querySelector('div'); div.addEventListener('click', function(e) { console.log('Simulated click'); }); const simulatedDivClick = document.createEvent('MouseEvents'); simulatedDivClick.initEvent( 'click', /* Event type */ true, /* bubbles */ true, /* cancelable */ document.defaultView, /* view */ 0, /* detail */ 0, /* screenx */ 0, /* screeny */ 0, /* clientx */ 0, /* clienty */ false, /* ctrlKey */ false, /* altKey */ false, /* shiftKey */ 0, /* metaKey */ null, /* button */ null /* relatedTarget */ ); // Automatically click after 1 second setTimeout(function() { div.dispatchEvent(simulatedDivClick); }, 1000);

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document.getElementById('elementId').dispatchEvent(new MouseEvent("click",{bubbles: true, cancellable: true}));

Follow this link to know about the mouse events using Javascript and browser compatibility for the same

https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent#Browser_compatibility

---

Use timeout if the event is not getting triggered

setTimeout(function(){ document.getElementById('your_id').click(); }, 200); 

---

This isn't very well documented, but we can trigger any kinds of events very simply.

This example will trigger 50 double click on the button:

let theclick = new Event("dblclick") for (let i = 0;i < 50;i++){ action.dispatchEvent(theclick) } TEST

The Event interface represents an event which takes place in the DOM. An event can be triggered by the user action e.g. clicking the mouse button or tapping keyboard, or generated by APIs to represent the progress of an asynchronous task. It can also be triggered programmatically, such as by calling the HTMLElement.click() method of an element, or by defining the event, then sending it to a specified target using EventTarget.dispatchEvent(). https://developer.mozilla.org/en-US/docs/Web/API/Event

https://developer.mozilla.org/en-US/docs/Web/API/Event/Event

---

The solution that worked for me.... Click event can be called on clicking the button or do it from JavaScript file. In this code either click on the button to show alert or simply call it on some condition or without condition

function ss(){ alert('dddddddddddddddddddddddd'); } var mybtn=document.getElementById('btn'); mybtn.click();

This is a Heading

This is a paragraph.

click to see

---

Honestly none of the answers here worked for my specific case. jquery was out of the question so all those answers are untested. I will say I built this answer up from @mnishiguchi answer above but this was the only thing that actually ended up working.

// select the element by finding the id of mytest1
const el = document.querySelector('#mytest1');

// pass the element to the simulateClick function
simulateClick( el );

function simulateClick(element){
    trigger( element, 'mousedown' );
    trigger( element, 'click' );
    trigger( element, 'mouseup' );

    function trigger( elem, event ) {
      elem.dispatchEvent( new MouseEvent( event ) );
    }
}

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document.getElementById("element").click()

Simply select the element from the DOM. The node has a click function, which you can call.

Or

document.querySelector("#element").click()

---

const Discord = require("discord.js");
const superagent = require("superagent");

module.exports = {
    name: "hug",
    category: "action",
    description: "hug a user!",
    usage: "hug <user>",
    run: async (client, message, args) => {
    let hugUser = message.mentions.users.first() 
    if(!hugUser) return message.channel.send("You forgot to mention somebody.");
    let hugEmbed2 = new Discord.MessageEmbed()
    .setColor("#36393F")
    .setDescription(`**${message.author.username}** hugged **himself**`)
    .setImage("https://i.kym-cdn.com/photos/images/original/000/859/605/3e7.gif")
     .setFooter(`© Yuki V5.3.1`, "https://cdn.discordapp.com/avatars/489219428358160385/19ad8d8c2fefd03fa0e1a2e49a2915c4.png")
  if (hugUser.id === message.author.id) return message.channel.send(hugEmbed2);
    const {body} = await superagent
    .get(`https://nekos.life/api/v2/img/hug`);

    let hugEmbed = new Discord.MessageEmbed()
    .setDescription(`**${message.author.username}** hugged **${message.mentions.users.first().username}**`)
    .setImage(body.url)
    .setColor("#36393F")
     .setFooter(`© Yuki V5.3.1`, "https://cdn.discordapp.com/avatars/489219428358160385/19ad8d8c2fefd03fa0e1a2e49a2915c4.png")
    message.channel.send(hugEmbed)
}
}

---