扩展历史对象

Question

我正在抓取popstate，需要根据历史堆栈中的current和originalEvent做各种事情。但是，我无法弄清楚如何获取当前状态进行比较，但originalEvent有效。这是我的JS代码。第一个IF语句抛出一个异常，即未定义e.state.id ......

$(window).on("popstate", function(e) {
        //check and compare current state
        if (e.state.id == 'something') {  // throws an exception
            *do something*
        } else if (e.originalEvent.state !== null) { //previous state exists?
            *do something*
        } else { //no previous state
            *do something*
        }
    });

仅供参考，推送状态设置为：

history.pushState({id: 'view'}, '', '/view');

Answer 1

扩展历史对象

这是我的资源，您可以从https://gist.github.com/HasanDelibas/12050fc59d675181ea973d21f882081a看到完整的资源

此库包含：

history.states->获取状态列表
history.stateIndex->当前状态索引
“ historyChange”事件->检测历史记录更改（从，到，side =“ back” |“转发”）
重要！ state必须是history.pushState( **state**, ...)的对象

(function(){
  let stateSymbol = "__state__index__";
  history.stateIndex =-1;
  history.states=[];
  let pushState = history.pushState;
  function add(data,title,url){
    if(data==null) data={};
    if(typeof data!="object") data={data:data};
    data[stateSymbol] = (history.stateIndex+1);
    history.states.splice(history.stateIndex+1,0,[data,title,url])
    history.states.splice(history.stateIndex+2)
    history.stateIndex++;
  }
  history.pushState =function(data,title,url=null){
    add(data,title,url);
    pushState.bind(history)(data,title,url);
  }
  addEventListener("popstate",function(e){
    var eventObject= {};
    var newStateIndex =  e.state!=null ? e.state[stateSymbol] : -1;
    eventObject.from = history.states[history.stateIndex];
    eventObject.to   = newStateIndex>-1 ? history.states[newStateIndex] : null;
    eventObject.side = history.stateIndex>newStateIndex ? "back" : "forward"; 
    if( newStateIndex > -1 && !(newStateIndex in history.states) ){
      add(history.state,"",window.location.href);
    }
    window.dispatchEvent(new CustomEvent("historyChange", {detail: eventObject} ))
    history.stateIndex = e.state!=null ? e.state[stateSymbol] : -1;
  });
})();

现在，您可以使用history.states对象获取所有状态，并使用addEventListener("popstate",function(e))

检测历史更改

使用

/**
  * @param e.detail.from [data,title,url]
  * @param e.detail.to   [data,title,url]
  * @param e.detail.side "back" | "forward"
  */
addEventListener("historyChange",function(e){
  var from = e.detail.from; // [ data , title , url ]
  var to   = e.detail.to;   // [ data , title , url ]
  var side = e.detail.side; // "back" | "forward"
  console.log( `You changed history. Side is ${e.detail.side}.\nFrom:${e.detail.from[2]}\nTo:${e.detail.to[2]}`)
})


history.pushState("1", "DENEME-TEST" ,"?1");
history.pushState("2", "DENEME-TEST" ,"?2");
// list of history states
console.log( history.states )
/*
[
  [ {...} ,  "DENEME-TEST" ,"?1" ]
  [ {...} ,  "DENEME-TEST" ,"?2" ]
]
*/
// get history current state index
console.log( history.stateIndex )
/*
1
*/

如何在Windows popstate上显示当前（不是以前的）状态

1 个答案:

扩展历史对象