将 .change 函数中变量的值传递和更新到全局变量 Jquery

Question

我正在寻找一种方法将值数组从 .change(function{}) 中的 var selectedId = [] 传递到全局 var globalId = []。所以每次selectedId中的值发生变化时，我都希望有一个像selectedId.update(globalId)或selectedId = globalId.update()这样的函数来更新全局id，但我不知道这部分怎么写.最终，我可以在其他更改功能中使用最新的 globalId。这是我的代码

$(function(){
    var globalId = [];

    $("#listbox1").change(function(){
        var selectedId =[];
        //get each selection
        $.each(selectedId , function (fIndex, fValue) {
            $.each(this.options, function (value, option) {
                if (this.selected) {
                    selectedId.push(option.value);
                }
            });
        });
        // send value to globalId 
        selectedId = globalId; // how to keep globalId up-to-date 
        // for everytime selectedId changes
        $.ajax({
            //....
            traditional: true, 
            data:{"// id in the controller": selectedId},
            success{...},
            error{...}
        });//end ajax

    });//end listbox1 change

    $("#listbox2").change(function(){
        var selectedId2 = [];
        // same each function to get selected <option>s as listbox1
        $.each{...
            $each{...
            };
        };
        $.ajax({
            //...
            data:{
                "//id1 in the controller": selectedId2, 
                "//id2 in the controller": globalId 
            },// this is the reason why I want to pass those values from listbox1  
            //to globalId so that I can use these two arrays in my controller function
            success{...},  
            error{}              
        });
    })//end listbox2 change
});//end ready

如果有人有解决这个问题的想法，我将不胜感激。

谢谢！

凯文

Answer 1

你可以这样做。

function GlobalIds(){
   var globalIds;
   return{
     getGlobalIds: function(){ return globalIds;},
     setGlobalIds: function(ids){ globalIds = ids}
    }
}

var globalIds = new GlobalIds();
globalIds.setGlobalIds([1,2]);
console.log(globalIds.getGlobalIds());
globalIds.setGlobalIds([3,4]);
console.log(globalIds.getGlobalIds());

而且你好像做错了作业。而不是

// send value to globalId 
          selectedId = globalId; // how to keep globalId up-to-date 
                                // for everytime selectedId changes

应该是

 globalId = selectedId;

将 .change 函数中变量的值传递和更新到全局变量 Jquery

Pass and update values from variable in .change function to global variable Jquery

javascript

ajax

jquery

getter-setter