


This article mainly introduces the detailed steps to implement the drag and drop function in HTML5. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look.
Question: I suddenly had a whim and wanted to add a collection (something similar to a shopping cart) on the movie website. You can add it by dragging the picture
Premise: You need to understand HTML5 China Loacl Strorage (of course, other web storage will also work, I use Local Stroage)
Solution: The main emphasis here is on the details of the drag and drop function, specifically html and css Just do it slowly by yourself
First of all, click the collection button to display the new p box (to store the collected movies), and click the second time to hide the p box. I won’t do too much here. Introduction
Set properties for pictures that can be dragged: draggable properties and ondragstart events
var pic_list=document.getElementsByClassName("middle_content")[0]; var pic_list_li=pic_list.getElementsByTagName("li"); for(var i=0;i<pic_list_li.length;i++){ var image=pic_list_li[i].getElementsByTagName("img")[0]; image.setAttribute("draggable",true); image.ondragstart=drag;
My code here is to get the selected To drag the parent element of the image, then traverse, set attributes and events for each img
3. Write the function when dragging and the function when dragging is completed
//设置拖拽效果 function drag(e){ e=e||event; e.dataTransfer.effectAllowed = "copy"; //IE需通过服务器访问方式,FF、chrome支持本地方式进行访问 e.dataTransfer.setData("text", e.target.src); //IE兼容写法 //e.dataTransfer.setData("text/plain", e.target.src); //标准写法 }
"copy" means literally, copying a copy of the natural data, and of course other attribute values, there will be no further explanation here
//拖拽释放效果 function drop(e){ //方式拖拽事件传播 allowDrop(e); //从拖拽事件中获取数据 var data=e.dataTransfer.getData("text"); //e.target.id=="dropdown",表示目标对象是p(dropdown) //e.target.parentNode.id=="dropdown"表示目标对象是dropdown的直接子元素UL //e.target.parentNode.parentNode.id=="dropdown" 表示目标对象是UL中的LI //e.target.parentNode.parentNode.parentNode.id=="dropdown"表示目标对是<a>元素 //e.target.parentNode.parentNode.parentNode.parentNode.id=="dropdown"表示目标对象是<img alt="Detailed explanation of the steps to implement drag and drop function in HTML5" >元素 if(e.target.id=="dropdown" || e.target.parentNode.id=="dropdown" || e.target.parentNode.parentNode.id=="dropdown" || e.target.parentNode.parentNode.parentNode.id=="dropdown" || e.target.parentNode.parentNode.parentNode .parentNode.id=="dropdown"){ //从localStorage中尝试根据Src读取数据 var newFilms=readFromStorage(data); if (newFilms==null){ films.filmsSrc=data; } //把处理后的商品信息存储到localStorage localStorage.setItem(data, JSON.stringify(films)); //重新加载并刷新页面中的collect document.getElementsByClassName("dropdown")[0].innerHTML=loadCollect(); } }
4. The above code contains information about key value reading For the value of localstrorage, I encapsulated it into a json object because the data may increase later. For example, it is not only the src of the picture, but also the introduction of the picture, such as the director, actor, introduction and other information. , at this time, it is better to use a json object
All the localstroage values that need to be read need to be encapsulated into a json object
//根据key读取localStorage的值并封装成JSON function readFromStorage(key){ var jsonStr=localStorage.getItem(key); var newFilms=JSON.parse(jsonStr); return newFilms; }
5. In fact, here, this drag and drop function is equivalent to realizing
Related recommendations:
Basic ideas for implementing drag and drop function in native js
How to implement drag and drop function in vue
WPF implements drag and drop function
The above is the detailed content of Detailed explanation of the steps to implement drag and drop function in HTML5. For more information, please follow other related articles on the PHP Chinese website!

html5的div元素默认一行不可以放两个。div是一个块级元素,一个元素会独占一行,两个div默认无法在同一行显示;但可以通过给div元素添加“display:inline;”样式,将其转为行内元素,就可以实现多个div在同一行显示了。

html5中列表和表格的区别:1、表格主要是用于显示数据的,而列表主要是用于给数据进行布局;2、表格是使用table标签配合tr、td、th等标签进行定义的,列表是利用li标签配合ol、ul等标签进行定义的。

固定方法:1、使用header标签定义文档头部内容,并添加“position:fixed;top:0;”样式让其固定不动;2、使用footer标签定义尾部内容,并添加“position: fixed;bottom: 0;”样式让其固定不动。

html5中不支持的标签有:1、acronym,用于定义首字母缩写,可用abbr替代;2、basefont,可利用css样式替代;3、applet,可用object替代;4、dir,定义目录列表,可用ul替代;5、big,定义大号文本等等。

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

3种取消方法:1、给td元素添加“border:none”无边框样式即可,语法“td{border:none}”。2、给td元素添加“border:0”样式,语法“td{border:0;}”,将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式,语法“td{border:transparent;}”,将td边框的颜色设置为透明即可。

因为html5不基于SGML(标准通用置标语言),不需要对DTD进行引用,但是需要doctype来规范浏览器的行为,也即按照正常的方式来运行,因此html5只需要写doctype即可。“!DOCTYPE”是一种标准通用标记语言的文档类型声明,用于告诉浏览器编写页面所用的标记的版本。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.