$('.btn').click(function() {

  $('[title=selected]').removeAttr("title");

  $(this).attr("title", "selected");

});

document.getElementById('button').onclick = function() {

   alert("button was clicked");

}•;•

var x = document.getElementById('container');

//click can also be antother event

x.addEventListener('click', function (x) {

  console.log('hi');

});

​

document.querySelector("span.testClass#testID").click()

// Create variable for what you are trying to click

let button = document.querySelector("#IDofItem");

​

// Click the button

​

if (button) {

  button.click();

}

else {

  console.log("Error");

}

window.onload = function() {

    var userImage = document.getElementById('imageOtherUser');

    var hangoutButton = document.getElementById("hangoutButtonId");

    userImage.onclick = function() {

       hangoutButton.click(); // this will trigger the click event

    };

};

function onClickFunction() {

  // Function code here

  console.log("Button clicked!");

}

​

// Attach the function to the button's click event

document.getElementById("myButton").addEventListener("click", onClickFunction);

<element onclick="functionToExecute()">Click</element>