How Can I Simulate Mouse Click Events in JavaScript?

Simulating Mouse Click Events in JavaScript

While the document.form.button.click() method is a common approach for triggering button clicks, there may be instances where you want to simulate the actual onclick event.

Simulating Events without Prototype.js

To simulate an onclick event without using Prototype.js, you can leverage the following code:

function simulate(element, eventName) {
  // Define options and event type
  const options = extend(defaultOptions, arguments[2] || {});
  let oEvent, eventType = null;

  for (const name in eventMatchers) {
    if (eventMatchers[name].test(eventName)) {
      eventType = name;
      break;
    }
  }

  // Ensure event type support
  if (!eventType) {
    throw new SyntaxError("Only HTMLEvents and MouseEvents interfaces are supported.");
  }

  // Create event using `document.createEvent`
  if (document.createEvent) {
    oEvent = document.createEvent(eventType);
    if (eventType === "HTMLEvents") {
      oEvent.initEvent(eventName, options.bubbles, options.cancelable);
    } else {
      oEvent.initMouseEvent(
        eventName,
        options.bubbles,
        options.cancelable,
        document.defaultView,
        options.button,
        options.pointerX,
        options.pointerY,
        options.pointerX,
        options.pointerY,
        options.ctrlKey,
        options.altKey,
        options.shiftKey,
        options.metaKey,
        options.button,
        element
      );
    }
    element.dispatchEvent(oEvent);
  } else {
    // Internet Explorer fallback
    options.clientX = options.pointerX;
    options.clientY = options.pointerY;
    const evt = document.createEventObject();
    oEvent = extend(evt, options);
    element.fireEvent("on" + eventName, oEvent);
  }

  return element;
}

Using the Simulation Function

To use this function, simply pass in the element and the event name:

simulate(document.getElementById("btn"), "click");

You can also specify additional options to customize the event, such as mouse coordinates:

simulate(document.getElementById("btn"), "click", { pointerX: 123, pointerY: 321 });

This approach provides greater flexibility and control over simulating mouse click events in JavaScript.

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