botón de activación haga clic en código javascript ejemplo

Ejemplo 1: clic del gatillo js

var element = document.getElementById('element');
element.click();

Ejemplo 2: javascript enlazar la tecla al botón

//https://stackoverflow.com/questions/6542413/bind-enter-key-to-specific-button-on-page
//upvote them on stackoverflow
//jquery------------------------------------------------------
//answer by Chris Laplante  
$(document).keypress(function(e){
    if (e.which == 13){
        $("#button").click();
    }
});

//pure javascript--------------------------------------------
//answer by Alexander Kim
window.addEventListener('keyup', function(event) {
  if (event.keyCode === 13) {
    alert('enter was pressed!');
  }
});

//https://www.w3schools.com/howto/howto_js_trigger_button_enter.asp
// Get the input field
var input = document.getElementById("myInput");
// Execute a function when the user releases a key on the keyboard
input.addEventListener("keyup", function(event) {
  // Number 13 is the "Enter" key on the keyboard
  if (event.keyCode === 13) {
    // Cancel the default action, if needed
    event.preventDefault();
    // Trigger the button element with a click
    document.getElementById("myBtn").click();
  }
});

Ejemplo 3: clic del gatillo js

<a href="#" target="_blank" onclick="javascript:Test("Test");">MSDN</a>

Ejemplo 4: clic del gatillo js

<form>
  <input type="checkbox" id="myCheck" onmouseover="myFunction()" onclick="alert('click event occurred')">
</form>

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