我有一个ul（无序列表），其中包含几个li（列表项）当我点击左边的+符号li时，控制台日志应该输出“description expanded”对于前两个li，它工作得很好，但是不是任何其他的李。默认情况下，html代码仅包含2个li。之后的任何li都是通过表单添加的。但是，任何新的li都不会产生控制台日志输出。这意味着他们没有对点击做出回应。我正在使用jQuery来监听点击事件。单击图标时。 项目链接http://pctechtips.org/apps/todo/
//variables
//todoList array to hold (title, description) for every todo tiem
var todoList = []; //{title: "value", desc: "value"},
var numId = 2; //num is for desc paragraph id eg <p id="plus-3">
/*
* Script main body
*/
$(document).ready(function() {
//hide form when doc loads first time
$("#submit-form").hide();
//hide list item description <p>
$(".item-desc").hide();
//listener for show hide form functionality
$("#add-todo").click(function() {
toggleForm();
return false; //return false to prevent page reload
});
//listener for add new item form (submit button)
$(".btn").click(function() {
console.log("submit item");
addToList();
});
//listener for expanding li description
$(".plus").click(function() {
console.log("description expanded")
var plusId = $(this).attr("id"); //grabbing id of plus sign
showDescription(plusId);
return false;
});
});
//functionality for show / hide form
function toggleForm() {
if($("#submit-form").is(":hidden")) {
console.log("form exapnded");
$("#submit-form").show("slow");
$("#form-icon").removeClass("fa-plus-square-o");
$("#form-icon").addClass("fa-minus-square-o");
}
else {
console.log("form hidden");
$("#submit-form").hide("slow");
$("#form-icon").removeClass("fa-minus-square-o");
$("#form-icon").addClass("fa-plus-square-o");
}
}
//add new item to todo list items
function addToList() {
numId++;
//getting data from input fields
var todoTitle = $("#todo-title").val();
var todoDesc = $("#todo-desc").val();
//checking user input
if(todoTitle == "" || todoDesc == "") {
alert("fill in all fields!");
}
else {
console.log(todoTitle + "\n" + todoDesc);
//adding values to array
todoList.push({title: todoTitle, desc: todoDesc},);
//adding new li to ul
var ul = document.getElementById("list");
var li = document.createElement("li");
$(li).addClass("list-group-item justify-content-between align-items-center");
$(li).append(($('<i id="plus-'+numId+'" class="plus fa fa-plus-square-o left" aria-hidden="true"></i>')));
$(li).append(($('<span class="left marg-left">'+todoTitle+'</span>')));
$(li).append(($('<i class="fa fa-trash-o right" aria-hidden="true"></i>')));
$(li).append(($('<i class="fa fa-pencil right marg-right pr-2" aria-hidden="true"></i>')));
ul.appendChild(li);
}
}
//expanding description under for each todo
function showDescription(plusId) {
//getting the number from id
var num = plusId.substring(plusId.indexOf("-")+1);
//checking for hide / show description paragraph
if($("#desc-"+num).is(":hidden")) {
$("#desc-"+num).show("slow");
$("#desc-"+num).removeClass("fa-plus-square-o");
$("#desc-"+num).addClass("fa-minus-square-o");
}
else {
$("#desc-"+num).hide("slow");
$("#desc-"+num).removeClass("fa-minus-square-o");
$("#desc-"+num).addClass("fa-plus-square-o");
}
}
的index.html
<!DOCTYPE html>
<html>
<head>
<title>TodoList App</title>
<!-- bootstrap, fontawsome cdn -->
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- local stylesheet -->
<link rel="stylesheet" type="text/css" href="css/style.css">
<!-- jquery cdn -->
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
<!-- local javascript -->
<script type="text/javascript" src="js/todo.js"></script>
</head>
<body>
<!-- navbar -->
<nav class="navbar navbar-expand-lg navbar-drak bg-dark mb-4">
<a class="navbar-brand" href="#"><i class="fa fa-thumb-tack" aria-hidden="true"></i> Todo<strong>List</strong></a>
</nav>
<!-- /navbar -->
<!-- todoList -->
<div class="container">
<div class="add-item text-white text-center col-sm-12 col-md-10 col-lg-8 mb-4">
<a id="add-todo" class="new-todo text-white text-center" href=""><i id="form-icon" class="fa fa-plus-square-o" aria-hidden="true"></i> Enter new todo item</a>
<div id="submit-form" class="form-hide text-center col-sm-12 col-md-12 col-lg-8">
<form class="">
<div class="form-group">
<input type="text" class="form-control" id="todo-title" placeholder="Todo Title" value="Pay Car Insurance">
</div>
<div class="form-group">
<input type="text" class="form-control" id="todo-desc" placeholder="Todo Description" value="This is to pay car insurance">
</div>
<button type="button" class="btn btn-primary btn-lg col-12">Submit Todo</button>
</form>
</div>
<!-- horizontal line -->
<hr>
<!-- list items -->
<h1 class="heading-4">Todo List Items</h1>
<ul id="list" class="list-group mt-4 pb-4">
<li class="list-group-item justify-content-between align-items-center">
<i id="plus-1" class="plus fa fa-plus-square-o left" aria-hidden="true"></i>
<span class="left marg-left">Pay Car Insurance </span>
<i class="fa fa-trash-o right" aria-hidden="true"></i>
<i class="fa fa-pencil right marg-right pr-2" aria-hidden="true"></i>
</li>
<p id="desc-1" class="item-desc bg-white">Helloooooooooo this is description</p>
<li class="list-group-item justify-content-between align-items-center">
<i id="plus-2" class="plus fa fa-plus-square-o left" aria-hidden="true"></i>
<span class="left marg-left">Pay Car Insurance </span><i class="fa fa-trash-o right" aria-hidden="true"></i>
<i class="fa fa-pencil right marg-right pr-2" aria-hidden="true"></i>
</li>
<p id="desc-2" class="item-desc bg-white">Helloooooooooo this is description</p>
</ul>
</div>
</div>
</body>
</html>
答案 0 :(得分：0)
使用
$(document).on("click", ".plus", function() {
console.log("description expanded")
var plusId = $(this).attr("id"); //grabbing id of plus sign
showDescription(plusId);
return false;
});
而不是在文档加载时定义静态单击侦听器。
答案 1 :(得分：0)
对于动态添加的元素，可以在根/文档级别定义偶数侦听器。所以
$("class").on("click", function() { });
不起作用。它必须是
$(document).on("click", ".class", function() { });
感谢＆＃34; MADDY BLACKLISTED＆＃34;上面指出了正确的方向