我创建了一个待办事项列表，所以当你在文本框中添加内容并单击添加按钮时，它会将其添加到列表中，如下所示。然而，我想快速添加一堆东西，而不是繁琐地使用我的鼠标每次点击添加按钮，这就是为什么我一直在尝试添加功能，当我按下回车键时，它将被添加。但是我所尝试的一切都没有起作用，是的，我已经阅读并试图使用stackoverflow上其他问题的代码，这就是为什么我最终决定问这个问题。
请帮忙![代码片段JavaScript部分的结尾是我最近的一次尝试]
// Create a "close" button and append it to each list item
var myNodelist = document.getElementsByTagName("LI");
var i;
for (i = 0; i < myNodelist.length; i++) {
var span = document.createElement("SPAN");
var txt = document.createTextNode("u00D7");
span.className = "close";
span.appendChild(txt);
myNodelist[i].appendChild(span);
}
// Click on a close button to hide the current list item
var close = document.getElementsByClassName("close");
var i;
for (i = 0; i < close.length; i++) {
close[i].onclick = function() {
var div = this.parentElement;
div.style.display = "none";
}
}
// Add a "checked" symbol when clicking on a list item
var list = document.querySelector('ul');
list.addEventListener('click', function(ev) {
if (ev.target.tagName === 'LI') {
ev.target.classList.toggle('checked');
}
}, false);
// Create a new list item when clicking on the "Add" button
function newElement() {
var li = document.createElement("li");
var inputValue = document.getElementById("myInput").value;
var t = document.createTextNode(inputValue);
li.appendChild(t);
if (inputValue === '') {
alert("You must write something!");
} else {
document.getElementById("myUL").appendChild(li);
}
document.getElementById("myInput").value = "";
var span = document.createElement("SPAN");
var txt = document.createTextNode("u00D7");
span.className = "close";
span.appendChild(txt);
li.appendChild(span);
for (i = 0; i < close.length; i++) {
close[i].onclick = function() {
var div = this.parentElement;
div.style.display = "none";
}
}
window.addEventListener('keyup', function (e) {
if (e.keyCode === 13) {
var button = document.getElementById("myInput");
button.click();
}
}, false);
}body {
background-color: #81B9E3;
font-family: 'Handlee', cursive;
}
h1 {
color: #2F90DA;
font-size: xxx-large;
font-family: 'Concert One', cursive;
}
a {
text-decoration: none;
color: #2F90DA;
}
p{
color: black;
}
body {
margin: 0;
min-width: 250px;
}
/* Include the padding and border in an element's total width and height */
* {
box-sizing: border-box;
}
/* Remove margins and padding from the list */
ul {
margin: 0;
padding: 0;
}
/* Style the list items */
ul li {
cursor: pointer;
position: relative;
padding: 12px 8px 12px 40px;
list-style-type: none;
background: #7DB9FF;
font-size: 18px;
transition: 0.2s;
/* make the list items unselectable */
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
/* Set all odd list items to a different color (zebra-stripes) */
ul li:nth-child(odd) {
background: #93C5FF;
}
/* Darker background-color on hover */
ul li:hover {
background: #51CA4C;
}
/* When clicked on, add a background color and strike out text */
ul li.checked {
background: #9DF599;
color: #51CA4C;
text-decoration: line-through;
}
/* Add a "checked" mark when clicked on */
ul li.checked::before {
content: '';
position: absolute;
border-color: #51CA4C;
border-style: solid;
border-width: 0 2px 2px 0;
top: 10px;
left: 16px;
transform: rotate(45deg);
height: 15px;
width: 7px;
}
/* Style the close button */
.close {
position: absolute;
right: 0;
top: 0;
padding: 12px 16px 12px 16px;
}
.close:hover {
background-color: #F44336;
color: white;
}
/* Style the header */
.header {
background-color: #2F90DA;
padding: 30px 40px;
color: white;
text-align: center;
}
/* Clear floats after the header */
.header:after {
content: "";
display: table;
clear: both;
}
/* Style the input */
input {
margin: 0;
border: none;
border-radius: 0;
width: 75%;
padding: 10px;
float: left;
font-size: 16px;
}
/* Style the "Add" button */
.addBtn {
padding: 8.5px;
width: 25%;
background: #81B9E3;
color: #fff;
float: left;
text-align: center;
font-size: 16px;
cursor: pointer;
transition: 0.3s;
border-radius: 0;
}
.addBtn:hover {
background-color: #51CA4C;
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>To Do List</title>
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Actor&family=Luckiest+Guy&display=swap" rel="stylesheet">
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Concert+One&family=Handlee&family=Actor&display=swap" rel="stylesheet">
<link href="todo.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div style="background-color: #DCEEF5; padding: 20px; text-align: center;">
<h1> 📖 To Do List 📖</h1>
<h2 style="margin-top: 0; margin-left: 20%; margin-right: 20%">Make your own to do list!</h2>
<h3>Type your task and click "Add". Once your task is completed, just click on the task to cross it off. Press the x button on the far right of a task to remove it.</h3>
<h4 style="margin-bottom: 3%;">Go back to <a href="home.html">Productify Home</a> or <a href="navigate.html">Navigation</a></h4>
</div><br/>
</body>
<style>
</style>
</head>
<body>
<div id="myDIV" class="header">
<h2 style="margin:5px">📖 My To Do List 📖</h2>
<input type="text" id="myInput" placeholder="New Task...">
<span onclick="newElement()" class="addBtn">Add</span>
</div>
<ul id="myUL"></ul>
<script src="todo.js"></script>
</body>
</html>您可以使用闭包对按钮和输入使用相同的处理程序。
// Cache your elements
const input = document.querySelector('input');
const list = document.querySelector('div');
const button = document.querySelector('button');
// Pass in the input and list elements to the handler
// The handler returns a new function that will be used
// for both the button and input listeners
const handler = handleInput(input, list);
button.addEventListener('click', handler, false);
input.addEventListener('keyup', handler, false);
function handleInput(input, list) {
// Initialise the text in the input
let text = '';
// Add the text to the page, reset `text`,
// and reset the input value
function printLine(text) {
list.innerHTML += `<div>${text}</div>`;
text = '';
input.value = '';
}
// This is the listener
return function(e) {
const { code, target: { value, type } } = e;
// If the button is clicked call `printLine`
if (type === 'submit') printLine(text);
// If the input has changed
// If return has been pressed call printLine
// otherwise update the text value
if (type === 'text') {
if (code === 'Enter') {
printLine(text);
} else {
text = value;
}
}
}
}<input />
<button>Add to list</button>
<div></div>