Question

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

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

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

这是假设的，因为它实际上并不起作用。不，触发click不会这样做。

我知道window.location和window.open但这些与本地链接跟踪有所不同，在某些方面对我来说很重要：a）存在<base />元素，和b ）在mailto个网址的情况下。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，而根据我的判断，只需单击mailto链接就不会。

我正在寻找一种方法来触发浏览器对Javascript代码的链接的默认处理。

这种机制存在吗？工具包特定的答案也欢迎（特别是对于Gecko）。

Answer 1

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

有些浏览器会在触发任何事件或更改实际href之前注意协议。

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：使用按钮和链接

onbeforeunload

Firefox仅针对按钮

onbeforeunload

Safari：永远不会触发onbeforeunload
Opera：与Safari相同

因此，阻止unload事件被触发的好方法是在beforeunload中返回false。

Answer 2

方法1 点击方法

HTMLElement有方法click() https://developer.mozilla.org/en/DOM/element.click

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

方法2 解雇合成事件

我想知道为什么saluce删除了他的答案。这个解决方案就是我过去使用的（当点击是IE唯一的东西时）。也就是说，触发合成浏览器事件（不是像jQuery的click()那样的假事件）。让我用这个想法发布一个解决方案......

DEMO：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');
}

Javascript / jQuery：以编程方式关注链接

2 个答案: