单击带有History.js的后退按钮时恢复内容 [英] Restoring content when clicking back button with History.js

问题描述

我在本地测试应用程序上实现了History.js.一切似乎都有效，但是如果我按下浏览器中的后退按钮，之前的内容就无法恢复。

I've implemented History.js on a local test application. Everything seems to work, however if I press the back button in the browser, the previous content does not get restored.

我是否真的必须再次手动加载内容（当用户按下后退按钮时，即进行另一个ajax调用？然后github如何做到这一点？我看到他们在点击代码树中的后退按钮时不再进行另一个ajax调用。

Do I actually have to load the content manually again (i.e. make another ajax call) when user presses the back button? Then how does github do it? I see they don't make another ajax call when clicking back button in the code tree.

这是我的代码：

History.Adapter.bind(window,'statechange',function()
    {
        var State = History.getState();
        History.log(State.data, State.title, State.url);
    });


    $('a').each(function(index, link) {

    if ($(link).attr('data-ajax-disabled') != 'true')    {

      $(link).click(function(event)
      {

         var clips = $(this).attr('data-ajax-clips') || '';

         $.ajax($(this).attr('href'),
         {
            data: {_clips:clips},
            success: function(data)
            {

               var data = $.parseJSON(data);


               History.pushState({state:1}, data.title || document.title, 'http://127.0.0.1/site/www/');


               $.each(data.clips, function(key, val)
               {
                  $(key).replaceWith(val);
               });

            }
         });

         return false;

      });
  }
  });

data.clips是一个json数组，其中包含html对象的id作为键，实际的html内容为值。例如

data.clips is a json array which contains id's of html objects as key and the actual html content as value. For example

'＃header'=>'标题div中的内容'

'#header' => 'content in header div'

如上所述，更换工作正常。我在标题中输出一个随机数。链接上的每次点击都会在标题中吐出另一个随机数。但是，如果按下后退按钮，数字保持不变，只会恢复标题（也是随机数）。

As noted, the replacement works fine. I output a random number in the header. Every click on a link spits out another random number in the header. However, if I push the back button the number stays the same, only the title will be restored (also random number).

推荐答案

好的，我得到了它，也感谢Tobias Cohen提示。

Ok I got it, also thanks to Tobias Cohen for the hint.

必须将加载的数据存储在历史对象（State.data）中。首先让我们看看statechange回调是如何改变的：

One has to store the loaded data in the history object (State.data). First let's see how the statechange callback changed:

History.Adapter.bind(window, 'statechange', function()
{

    var State = History.getState();

    $.each(State.data.clips, function(key, val)
    {
        $(key).replaceWith(val);
    });

    History.log(State.data, State.title, State.url);

});

正如您所看到的，在每个状态变化中，我可以访问State.data.clips并替换html内容。

As you can see, on each statechange I can access State.data.clips and replace the html content.

注意：调用History.pushState（）时也会发生状态转换。这意味着在我最初的问题中，第二个代码片段是错误的，因为我在那里进行内容操作。没有必要。只需调用History.pushState（）并在statechange回调中进行任何内容操作。

NOTE: A statechange does also happen when calling History.pushState(). That means in my initial question the second code snippet is wrong in the fact that I do the content manipulation in there. There's no need for it. Just call History.pushState() and do any content manipulation within the statechange callback.

因此，为了完整性，我将这些剪辑推送到历史对象中：

So for completeness, this is how I push the clips into the history object:

History.pushState({state:1, clips:data.clips}, data.title || document.title, 'http://127.0.0.1/site/www/');

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