18

在 Javascript 代码中,我想以编程方式使浏览器跟随我页面上的链接。简单案例:

<a id="foo" href="mailto:somebody@example.com">something</a>

function goToBar() {
   $('#foo').trigger('follow');
}

这是假设的,因为它实际上不起作用。不,触发click不会这样做。

我知道,window.location但是window.open这些在某些对我很重要的方面与原生链接跟踪不同:a)在<base />元素存在的情况下,b)在mailtoURL 的情况下。后者尤其重要。至少在 Firefox 中,调用window.location.href = "mailto:somebody@example.com"会导致窗口的unload处理程序触发,而仅单击mailto链接不会,据我所知。

我正在寻找一种方法来触发浏览器对链接的默认处理,从 Javascript 代码。

这样的机制存在吗?也欢迎工具包特定的答案(尤其是对于 Gecko)。

4

2 回答 2

28

据我所知, window.location 完全符合您的要求,触发了浏览器的默认链接点击行为。

一些浏览器会在触发任何事件或更改实际 href 之前注意到协议。

window.location = "mailto:somebody@example.com";

尝试下面提到的小提琴演示,我得到以下结果:

  • Chromium:onbeforeunload使用按钮和链接触发
  • Firefoxonbeforeunload只为按钮触发
  • Safari:从不触发onbeforeunload
  • Opera:与 Safari 相同

因此,防止unload事件被触发的一个好方法是返回 false in beforeunload

于 2012-06-05T23:18:03.910 回答
6

方法 1点击方法

HTMLElements 有一个方法click() https://developer.mozilla.org/en/DOM/element.click

function goToBar() {
   document.getElementById('foo').click();
}

方法 2触发合成事件

我想知道为什么 saluce 删除了他的答案。该解决方案是我过去使用过的(当点击只是 IE 时)。也就是说,触发一个合成浏览器事件(不是像 jQuery 那样的假事件click())。让我使用这个想法发布一个解决方案......

演示:http: //jsfiddle.net/eyS6x/3/

/**
 * Fire an event handler to the specified node. Event handlers can detect that the event was fired programatically
 * by testing for a 'synthetic=true' property on the event object
 * @param {HTMLNode} node The node to fire the event handler on.
 * @param {String} eventName The name of the event without the "on" (e.g., "focus")
 */
function fireEvent(node, eventName) {
  // Make sure we use the ownerDocument from the provided node to avoid cross-window problems
  var doc;
  if (node.ownerDocument) {
    doc = node.ownerDocument;
  } else if (node.nodeType == 9 /** DOCUMENT_NODE */){
    // the node may be the document itself
    doc = node;
  } else {
    throw new Error("Invalid node passed to fireEvent: " + +node.tagName + "#" + node.id);
  }

  if (node.fireEvent) {
    // IE-style
    var event = doc.createEventObject();
    event.synthetic = true; // allow detection of synthetic events
    node.fireEvent("on" + eventName, event);
  } else if (node.dispatchEvent) {
    // Gecko-style approach is much more difficult.
    var eventClass = "";

    // Different events have different event classes.
    // If this switch statement can't map an eventName to an eventClass,
    // the event firing is going to fail.
    switch (eventName) {
      case "click":
      case "mousedown":
      case "mouseup":
        eventClass = "MouseEvents";
        break;

      case "focus":
      case "change":
      case "blur":
      case "select":
        eventClass = "HTMLEvents";
        break;

      default:
        throw "JSUtil.fireEvent: Couldn't find an event class for event '" + eventName + "'.";
        break;
    }
    var event = doc.createEvent(eventClass);
    var bubbles = eventName == "change" ? false : true;  
    event.initEvent(eventName, bubbles, true); // All events created as bubbling and cancelable.

    event.synthetic = true; // allow detection of synthetic events
    node.dispatchEvent(event);
  }
};

document.getElementById('button').onclick = function() {
   fireEvent( document.getElementById('link'), 'click');
}
于 2012-06-05T23:03:42.753 回答