Question

我有30个用户，ID为1~30
memberInThisGroup是一个数组[2,24]
我想检查id是否在数组中（2,24）然后给它选择selected

string +="<option value=\""+data.userId+"\"  selected >"+data.userName+"</option>";

否则，只是一个正常选项

string +="<option value=\""+data.userId+"\">"+data.userName+"</option>";

这是我的代码有错误，似乎只是检查了一次，而selected选项是相反的请指导我如何写谢谢

function getCurrentusers(memberInThisGroup,groupId) {
    console.log(memberInThisGroup);  //2,24
    $.ajax({
        type : 'GET',
        url : 'currentusers',
        async : true,
        success : function(datas) {  
                //for loop every elements
                var string ="";
                for(var i in datas){
                    var data = datas[i];    
                    if(memberInThisGroup.indexOf(data.userId)){
                        console.log("We have member"+data.userId);
                        string +="<option value=\""+data.userId+"\"  selected >"+data.userName+"</option>"; 
                    }else{
                        console.log("We don't have member"+data.userId);
                        string +="<option value=\""+data.userId+"\">"+data.userName+"</option>";    
                    }
                }
                $("#e_"+groupId).append(string);    
                $('#e_'+groupId).multiSelect('refresh');            

        }
    });
}

datas ajax get是json喜欢：

[{"userId":1,"userName":"Ken","password":"a12345","account":"ken@qq.com"},
{"userId":2,"userName":"wen","password":"qqqq","account":"wen@gmail.com"},
{"userId":3,"userName":"win","password":"1234","account":"win@gmail.com"},...]

这是我的控制台输出：

We have member1
We don't have member2
We have member3
We have member4
We have member5
....

但我的期望是：

We have member2
We have member24
We don't have member1
We don't have member3
We don't have member4
We don't have member5
....

Answer 1

试试这个

var string = "",
    memberInThisGroup = [2, 24], // just for test 
    data, selected;

for (var i = 0, len = datas.length; i < len; i++) {
    data     = datas[i];
    selected = (memberInThisGroup.indexOf(data.userId) >= 0) ? 'selected' : '';

    string += "<option value=\"" + data.userId + "\" " + selected + ">" + data.userName + "</option>"; 
}

Example

Javascript：检查是否为数组中的循环值

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