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javascript - 如何模拟对按钮类的按住单击

问题描述

如何模拟按住按钮单击？我可以elements.[0].click();用来模拟点击的地方，我怎样才能让它按住按钮例如 5 秒而不是放开它？

示例代码

<!DOCTYPE html>
<html>
<body>

<button class="button" id="button">You released the mouse button.</p>

<script>
document.getElementById("button").onmousedown = function() {mouseDown()};
document.getElementById("button").onmouseup = function() {mouseUp()};

function mouseDown() {
  document.getElementById("button").innerHTML = "The mouse button is held down.";
}

function mouseUp() {
  document.getElementById("button").innerHTML = "You released the mouse button.";
}
</script>

</body>
</html>

标签： javascriptjquery

解决方案

你可以自己创造事件，当然也可以MouseEvents自己创造。

在现代浏览器中，您可以通过调用所需事件类型的构造函数来执行此操作，或者通过调用document.createEvent('<EventName>') https://developer.mozilla.org/en-US/docs/Web/API/Event

然后，您可以使用https://developer.mozilla.org/de/docs/Web/API/EventTarget/dispatchEvent在您喜欢的任何元素上触发此事件dispatchEvent() 

document.getElementById("button").addEventListener('mousedown', mouseDown);
document.getElementById("button").addEventListener('mouseup', mouseUp);

function mouseDown() {
  document.getElementById("button").innerHTML = "The mouse button is held down.";
}

function mouseUp() {
  document.getElementById("button").innerHTML = "You released the mouse button.";
}


// bind click event on simulate button
document.querySelector('.simulate').addEventListener('click', () => {
  console.log('start');
  simulateMouseEvent(document.getElementById("button"), 'mousedown')
  setTimeout(() => {
    console.log('end');
    simulateMouseEvent(document.getElementById("button"), 'mouseup')
  }, 5000)
})

// capsulate the event trigger stuff
// see: http://youmightnotneedjquery.com/
function simulateMouseEvent(el, eventName){
  let event;
  if (window.MouseEvent && typeof window.MouseEvent === 'function') {
    event = new MouseEvent(eventName);
  } else {
    event = document.createEvent('MouseEvent');
    event.initMouseEvent(eventName);
  }

  el.dispatchEvent(event);
}
<!DOCTYPE html>
<html>
<body>

  <p>
    <button class="button" id="button">You released the mouse button.</button>
  </p>

  <p>
    <button class="simulate">simulate</button>
  </p>

</body>
</html>

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