写一个带有“请选择的”的下拉框，需要用到 map（用于设置默认值）和 Array(用于填充数据)

来源：互联网发布：centos svn 防火墙编辑：程序博客网时间：2024/06/14 18:58

 var expressNameList = new Array();var  expressNameMap= new Map();$.ajax({                type: "post",                url: "${ctx}/staticData/query?typeCode=EXPRESS_NAME&dataCode=",                contentType: "application/json;charset=utf-8",                success: function(data) {                    if (data != null && data.length > 0) {                        $(eval(data)).each(function(){                            expressNameMap.put(this.value,this.name);                            expressNameList[expressNameList.length] = {itemText: this.name, itemData: this.value};                        });                        // 设置快递名称类型下拉列表                        expressName = $("#qexpressName-dropdownlist").dropDownList({                            inputName: "qexpressName",                            inputValName: "qexpressNameId",                            buttonText: "",                            width: "117px",                            readOnly: false,                            required: true,                            maxHeight: 200,                            onSelect: function(i, data, icon) {},                            items: expressNameList                        });                        expressName.setData("请选择", "0", "");                    }                },                error: function(req, error, errObj) {                }            });

1 map的用法

在grid栏显示数据的时候：

{title:'快递名称',name:'expressName',width:100,sortable:true,align:'left'    ,renderer: function (val, item, rowIndex){                    if (item && item.expressName) {                        return expressMap.get(item.expressName)                    }                     }},

2.修改界面显示数据的时候：

                       $('#expressState').val(expressStateListMap.get(rowExpress.expressState).itemData);$('#expressStateId1').val(expressStateListMap.get(rowExpress.expressState).itemText);

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