html5 has new attributes, such as contextmenu, contentEditable, hidden, draggable, "data-*", placeholder, required, pattern, autofocus, autocomplete, etc.

Does html5 have new attributes?

The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.

HTML5 new attributes

1.1, contextmenu

The function of contextmenu is to specify the right-click menu.

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <div id="div1" style="height:900px; background: lightgreen;" contextmenu="menuShare">
        </div>
        <menu id="menuShare" type="context">
            <menuitem label="分享到QQ空间" onclick="alert(&#39;QQ&#39;);"></menuitem>
            <menuitem label="分享到朋友圈" onclick="alert(&#39;朋友圈&#39;);"></menuitem>
            <menuitem label="分享到微博" onclick="alert(&#39;微博&#39;);"></menuitem>
        </menu>
    </body>
</html>

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Running effect:

contextmenu In Html5, each element has a new attribute: contextmenu, contextmenu is the context menu, that is, right-click the mouse A menu will appear for the element.
menu To realize that a menu will appear when you right-click an element, you must also understand another new element in HTML5: menu. As the name suggests, menu defines the menu. The menu element attributes: type: menu type attribute. There are three values 1) context: context; 2) toolbar: toolbar; 3) list: list

Menu items can be embedded inside, that is, < ;menuitem>.
menuitem attributes:
label: the name displayed by the menu item
icon: the icon displayed on the left side of the menu item
onclick: the event triggered by clicking the menu item

1.2 , contentEditable

Specifies whether the content of the element can be edited
Attribute value:
true -----The content of the element can be edited
false -----The element cannot be edited Content
inherit -----Inherit the contenteditable attribute of the parent element
When it is an empty string, the effect is the same as true.
When the contenteditable status of an element is true (the contenteditable attribute is an empty string, or is true, or is inherit and its parent element status is true), it means that the element is editable. Otherwise, the element is not editable.

document.body.contentEditable=true; You can modify the published website

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>contentEditable属性</title>
    </head>
    <body>
        <h2>contentEditable属性</h2>
        <div contenteditable="true">
            Hello contentEditable
        </div>
    </body>
</html>

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1.3、hidden

The hidden attribute is used to hide the element. Once this attribute is used, the element will not be displayed in the browser
2 Boolean values
true specifies that the element is visible.
false specifies that the element is invisible.

        <div hidden="hidden">
            Hello Hidden
        </div>

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In order to be compatible with some browsers (IE8) that do not support this attribute, you can add the following style to CSS:

*[hidden]{
   display: none;
}

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var p1=document.querySelector("body #p1");
p1.innerHTML+=" +++";

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1.4, draggable

Specifies whether the element can be dragged
3 enumeration values
true specifies whether the element is draggable.
false specifies that the element is not draggable.
auto uses the browser's default features.

Example:

<!DOCTYPE html><html>

    <head>
        <meta charset="utf-8">
        <script src="Scripts/jquery-1.11.3.min.js" type="text/javascript" charset="utf-8"></script>    
        <title></title>
        <style>
            #p1,
            #p3 {
                height: 200px;
                width: 200px;
                border: 1px solid #00f;
                margin-bottom: 10px;
            }
            #p2 {
                height: 100px;
                width: 100px;
                background: yellow;
            }
        </style>
        <script>
            var p1, p2, p3, msg;
            window.onload = function() {
                p1 = document.getElementById("p1");
                p2 = document.getElementById("p2");
                p3 = document.getElementById("p3");
                msg = document.getElementById("msg");
                
                p2.ondragstart=function(){
                    msg.innerHTML+="p2开始拖动了<br/>";
                }
                p2.ondrag=function(){
                    msg.innerHTML+="拖动中<br/>";
                }
                p2.ondragend=function(){
                    msg.innerHTML+="拖动结束<br/>";
                }
                
                p1.ondragover = function(e) {
                    e.preventDefault();
                }
                p1.ondrop = function(e) {
                    p1.appendChild(p2);
                }
                p3.ondragover = function(e) {
                    e.preventDefault();
                }
                p3.ondrop = function(e) {
                    p3.appendChild(p2);
                }
                
                $("#p1").data("name","电池");
                alert($("#p1").data("name"));
                
                p1.setAttribute("data-order-price",998.7);
                alert(p1.getAttribute("data-order-price"));
            }        </script>
    </head>

    <body>
        <p id="p1" data-order-price="98.5" data-name="充电宝"></p>
        <p id="p3"></p>
        <p id="p2" draggable="true"></p>
        <h3 id="msg"></h3>
    </body></html>

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Run result:

<!DOCTYPE html><html lang="en"><head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title></head><body>
    <p style="height: 300px; background: lightgoldenrodyellow;"  ondrop="ondropEvent(event)" ondragover="ondragoverEvent(event)"></p>
    <img src="img/x.png" width="200" draggable="true" ondragstart="ondragstartEvent(event)"/>
    <img src="img/tv.png" width="200" draggable="true" ondragstart="ondragstartEvent(event)"/>
    <script>
        var target;        function ondragstartEvent(e){
            target=e.target;            //记住当前被拖动的对象            console.log(e.target);
        }        function ondropEvent(e){
            e.preventDefault();
            e.target.appendChild(target);

        }        function ondragoverEvent(e){
            e.preventDefault();
        }    </script></body></html>

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##1.5, data- *

data-*attribute allows users to store data in the form of customized attributes

Value:
getAttribute('data-order-amount')
dataset.orderAmount
The data() method in jQuery can also be accessed

Example of using jQuery and javascript to add and obtain data attributes:

<!DOCTYPE html><html>
    <head>
        <meta charset="UTF-8">
        <title>data-*</title>
        <script src="js/jquery-1.11.3.min.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body>
        <h2>data-*</h2>
        <p id="p1" data-student-name="Tom" data-stu=&#39;{"a":1,"b":2}&#39;></p>
        <button onclick="addData()">添加数据</button>
        <button onclick="getData()">获取数据</button>
        <script type="text/javascript">
            var p1=document.getElementById("p1");            function addData()
            {                //给p1添加属性data-student-name，值为rose                p1.setAttribute("data-student-name","Rose");
                $("#p1").data("stu-mark","99分");
            }            function getData()
            {                //原生JavaScript
                //alert(p1.getAttribute("data-student-name"));
                
                //jQuery                alert($("#p1").data("student-name"));
                alert($("#p1").data("stu").a);
                alert($("#p1").data("stu-mark"));
            }            
            
            var x="{a:1}";
            alert(eval("("+x+")").a);        </script>
    </body></html>

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Running effect:

1.6, placeholder attribute

This is a very practical attribute. There is no need to use JS to realize the click to clear the initial value of the form. Browser support is also pretty good. In addition to Firefox, other standard browsers can support it well

            <p>
                <label>邮箱：</label>
                <input type="email" name="mail" id="mail" value="" placeholder="请输入邮箱"/>
            </p>

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1.7, requiredRequired attribute

The constraint table unit must enter a value before submitting.

            <p>
                <label>博客：</label>
                <input type="url" name="blog" id="blog" value="" required="required"/>
            </p>

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1.8, pattern regular attribute

Constrains the value entered by the user to match the regular expression.

            <p>
                <label>帐号：</label>
                <input type="text" required="required" pattern="^[0-9a-zA-Z]{6,16}$" />请输入a-zA-Z0-9且长度6-16位的字符            
                </p>

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1.9, autofocus automatic focus attribute

            <p>
                <label>博客：</label>
                <input type="url" name="blog" id="blog" value="" required="required" autofocus="autofocus"/>
            </p>

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Let the specified form element get focus.

1.10. autocomplete attribute

When the autocomplete function is set on a form element, the information entered by the user will be recorded. Content, double-clicking the form element will display historical input.

该属性默认是打开的。

1.11、novalidate不验证属性

novalidate 属性规定在提交表单时不应该验证 form 或 input 域。

<form action="demo_form.asp" method="get" novalidate="true">
<button formnovalidate="formnovalidate" >提交</button>

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1.12、multiple多选属性

multiple 属性规定输入域中可选择多个内容，如：email 和 file

<input type="file" multiple="multiple” />

            <p>
                <label>相片：</label>
                <input type="file" multiple="multiple"/>
            </p>

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        HTML5新的表单元素
    


    
        HTML5新的表单元素
        
            
                姓名：
                
            
            <p>
                <label>相片：</label>
                <input type="file" multiple="multiple"/>
            </p>
            
                帐号：
                请输入a-zA-Z0-9且长度6-16位的字符            
            <p>
                <label>邮箱：</label>
                <input type="email" name="mail" id="mail" value="" placeholder="请输入邮箱"/>
            </p>
            <p>
                <label>博客：</label>
                <input type="url" name="blog" id="blog" value="" required="required" autofocus="autofocus"/>
            </p>
            
                生日：
                
            
            
                身高：
                
            
            
                肤色：
                
            
            
                体重：

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