Question

我将参数发送到服务器，它用数组对象响应我。我得到它并使用JSON.stringify函数，然后使用JSON.parse。当我在主体中分配按钮时，它可以正常工作，虽然它没有正确放置在html中。如果我分配给迭代id则会出错。我该怎么做才能处理问题，并有一个click事件来删除当前项并删除它。这是我的代码：

<script>
var param={user_id: localStorage.getItem('user_id')};
getmyItems(param,function(data){
    var mtItem=JSON.stringify(data);
    myItem=JSON.parse(mtItem);
    console.log(myItem);
    var Item=document.getElementById('myItems');
    var buffer="";
    for(var i=0;i<myItem.results.length;i++){

        buffer +='<div class="row">';
            buffer +='<div class="col-md-12">';
                buffer +='<img src="'+myItem.results[i].images+'"/>';
            buffer +='</div>';
        buffer +='</div>';
        buffer +='<div class="row">';
            buffer +='<div class="col-md-4">';
                buffer +='Created on:'+myItem.results[i].creation_date;
            buffer +='</div>';
            buffer +='<div class="col-md-4">';
                buffer +='incident_date:'+myItem.results[i].item_date;
            buffer +='</div>';
            buffer += '<div class="col-md-4">';
                buffer +='approval_date:'+myItem.results[i].approved_date;
            buffer +='</div>';
        buffer +='</div>';
        buffer+='<div class="row">';
            buffer+='<div class="col-md-12">';
                buffer+='Title: '+myItem.results[i].title;
            buffer+='</div>';
        buffer+='</div>';
        buffer+='<div class="row" id="'+i+'">';
            var btn=document.createElement('input');
            btn.setAttribute('type','button');
            btn.setAttribute('class','btn btn-danger');
            btn.value="Delete";
            btn.onclick=(function (i){
                return function(){
                    doDelete(myItem.results[i].item_id);
                };
                })(i);

            document.getElementById('i').appendChild(btn);

        buffer+='</div><hr/>';
    }
    Item.innerHTML=buffer;
});

function doDelete(s){
        var param={
            user_id: localStorage.getItem('user_id'),
            session: sessionStorage.getItem('session'),
            item_id: s
        };
        deleteItem(param, function(data){
            alert(JSON.stringify(data));
        });
    }
   </script>

Answer 1

嗯，在您的情况下，您正在尝试访问DOM
中不存在的元素

不是在循环结束时创建buffer并设置innerHTML，而是创建div元素并将buffer元素设置为innerHTML创建的{ {1}}元素。 div appendChild内的buffer元素，之后，您可以访问for-loop作为变量值id的元素

试试这个：

var myItem = {
  success: true,
  error_cod: 0,
  results: [{
    title: "flood",
    creation_date: "2016/01/01"
  }, {
    title: "earthquake",
    creation_date: "2016/01/05"
  }]
};
var Item = document.getElementById('myItems');
for (var i = 0; i < myItem.results.length; i++) {
  var buffer = "";
  buffer += '<div><div class="row">';
  buffer += '<div class="col-md-12">';
  buffer += '<img src="' + myItem.results[i].title + '"/>';
  buffer += '</div>';
  buffer += '</div>';
  buffer += '<div class="row">';
  buffer += '<div class="col-md-4">';
  buffer += 'Created on:' + myItem.results[i].creation_date;
  buffer += '</div>';
  buffer += '<div class="col-md-4">';
  buffer += 'incident_date:' + myItem.results[i].creation_date;
  buffer += '</div>';
  buffer += '<div class="col-md-4">';
  buffer += 'approval_date:' + myItem.results[i].creation_date;
  buffer += '</div>';
  buffer += '</div>';
  buffer += '<div class="row">';
  buffer += '<div class="col-md-12">';
  buffer += 'Title: ' + myItem.results[i].title;
  buffer += '</div>';
  buffer += '</div>';
  buffer += '<div class="row" id="' + i + '">';
  buffer += '</div><hr/></div>';
  var div = document.createElement('div');
  div.innerHTML = buffer;
  var elem = div.firstChild;
  Item.appendChild(elem);
  var btn = document.createElement('input');
  btn.setAttribute('type', 'button');
  btn.setAttribute('class', 'btn btn-danger');
  btn.value = "Delete";
  btn.onclick = (function(i) {
    return function() {
      doDelete(myItem.results[i].creation_date);
    };
  })(i);
  document.getElementById(i).appendChild(btn);
}

function doDelete(s) {
  alert(s);
}

Answer 2

我通过一点改变来解决问题。我评论人造丝提供的线条。它很好用。

var div = document.createElement('div');
div.innerHTML = buffer;
//var elem = div.firstChild;
Item.appendChild(div);
var btn = document.createElement('input');
btn.setAttribute('type', 'button');
btn.setAttribute('class', 'btn btn-danger');
btn.value = "Delete";
btn.onclick = (function(i) {
  return function() {
    doDelete(myItem.results[i].item_id);
  };
})(i);
Item.appendChild(btn);
//document.getElementById(i).appendChild(btn);

使用javascript在for循环中创建按钮

2 个答案: