How to dynamically control page elements in jQuery

This article mainly introduces jQuery's method of dynamically controlling page elements, and analyzes jQuery event response and dynamic operation of page elements related implementation techniques in the form of examples. Friends in need can refer to the following

Examples of this article Introduce jQuery to implement dynamic control of page elements. Share it with everyone for your reference, the details are as follows:

Background

I recently made a small system, which requires the user’s friends to be displayed on the page Perform additions, deletions, modifications and checks. It's not that complicated originally and can be implemented relatively easily in tabular form.

But considering the user experience, first add as little as possible without typing, just display all users in categories, and then click to add.

The added users are also displayed on the interface, showing the user's current friends. At the same time, click on the added friend to proceed with the next business operation.

Of course, the deletion operation is the same as on the mobile phone. There is a red "x" in the upper right corner. Click on the friend to delete it.

The final interface can also exit the deleted mode and return to the normal mode.

Function description

1. Add a user: Click on the list to add a user and add an onclick event at the same time
2. Delete a user : Click on the friend to delete it
3. Enter deletion mode: change the interface to delete mode, switch onclick event
4. Return to normal mode: change the interface to normal mode, switch onclick event

Picture display

##Code

//添加用户为自己常用好友
function Add(e) {
  var friend_id = e.id;
  var name = $("#" + friend_id).html();
  //将要插入页面的好友html代码
  var content = "<p id=\"friend" + friend_id + "\" class=\"case-item\" onclick=\"" + game_type + "(this)\"><p class=\"ih-item circle effect1\"><a href=\"#\"><img class=\"img_wrong\" src=\"image/wrong.png\" style=\"float: right; width: 15px; height: 15px;display:none\" /><p class=\"spinner\"></p><p class=\"img\"><h3 id=\"" + friend_id + "\">" + name + "</h3></p><p class=\"info\"><p class=\"info-back\"><h3 class=\"info-word\">" + info_word + "</h3></p></p></a></p></p>";
  //向数据库添加，通过结果来确定界面显示
  $.ajax({
   url: "userlist.aspx/AddFriend",
   data: "{&#39;username&#39;:&#39;" + $(&#39;#username&#39;).text() + "&#39;,&#39;friend_id&#39;:&#39;" + friend_id + "&#39;}",
   type: &#39;Post&#39;,
   contentType: "application/json; charset=utf-8",
   dataType: "json",
   success: function (result) {
    if (result.d == "true") {
     $(".case-content").append(content);//数据库添加成功，插入html代码
    }
    else {
     alert(result.d);
    }
   },
   error: function (err) {
    alert("未知错误");
   }
  });
}
//删除好友
function Delete(e) {
  var friend_id = e.id;
  $.ajax({
   url: "userlist.aspx/DeleteFriend",
   data: "{&#39;username&#39;:&#39;" + $(&#39;#username&#39;).text() + "&#39;,&#39;friend_id&#39;:&#39;" + friend_id + "&#39;}",
   type: &#39;Post&#39;,
   contentType: "application/json; charset=utf-8",
   dataType: "json",
   success: function (result) {
    if (result.d == true) {
     $("#" + friend_id).remove();//在界面移除好友
    }
    if (result.d == false) { alert("删除失败"); }
   },
   error: function (err) {
    alert("未知错误");
   }
  });
}
//重置好友-切换到删除模式
function ChangeToDelete() {
  $(".case-item").removeAttr("onclick");//删除onclick事件
  $(".case-item").attr("onclick", "Delete(this);");//添加新的onclick事件
  $(".img_wrong").css("display", "block");//使删除图标可见
  $(".info-word").html("删除");//改变提示文字
}
//关闭重置-切换到正常模式
function ChangeToNormal() {
  $(".case-item").removeAttr("onclick");//删除onclick事件
  $(".case-item").attr("onclick", "");//添加新的onclick事件
  $(".img_wrong").css("display", "none");//使删除图标不可见
  $(".info-word").html(info_back);//恢复提示文字
}

Summary

There are two points learned in this exercise:

1. The interaction between Ajax and the background;

2. JQuery Attribute control of page elements

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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