HTML DOM

HTML DOM

      文档对象模型(Document Object Model,DOM)是一种用于HTML和XML文档的编程接口。它给文档提供了一种结构化的表示方法,可以改变文档的内容和呈现方式。我们最为关心的是,DOM把网页和脚本以及其他的编程语言联系了起来。DOM属于浏览器,而不是JavaScript语言规范里的规定的核心内容。

一、查找元素

1.直接查找

document.getElementById             //根据ID获取一个标签
document.getElementsByName          //根据name属性获取标签集合
document.getElementsByClassName     //根据class属性获取标签集合
document.getElementsByTagName       //根据标签名获取标签集合

 

2、间接查找

//含文本
parentNode          // 父节点
childNodes          // 所有子节点
firstChild          // 第一个子节点
lastChild           // 最后一个子节点
nextSibling         // 下一个兄弟节点
previousSibling     // 上一个兄弟节点
 
//不含文本
parentElement           // 父节点标签元素
children                // 所有子标签
firstElementChild       // 第一个子标签元素
lastElementChild        // 最后一个子标签元素
nextElementtSibling     // 下一个兄弟标签元素
previousElementSibling  // 上一个兄弟标签元素

 

二、操作

1、内容

innerHTML   //获取标签内的HTML
outerHTML  //获取标签及标签内的HTML
innerText   //设置或获取位于对象起始和结束标签内的文本
outerText  //设置(包括标签)或获取(不包括标签)对象的文本
value        //获取表单类(text、password、textarea、checkbox、radio、select)的标签里的值
/*
取值
obj.innerHTML
obj.innerText
赋值
obj.innerHTML=‘<p>123</p>’
obj.innerText='123'
*/

 

注意:

1、innerText和outerText在获取时是相同效果,但在设置时,innerText仅设置标签内的文本,而outerText设置包括标签在内的文本。 

2、innerHTML和outerHTML、innerText与outerText的不同之处在于:
  1)innerHTML与outerHTML在设置对象的内容时包含的HTML会被解析,而innerText与outerText则不会。
  2)在设置时,innerHTML与innerText仅设置标签内的文本,而outerHTML与outerText设置包括标签在内的文本。

更详细:http://walsh.iteye.com/blog/261966

2、属性

attributes                // 获取所有标签属性

setAttribute(key,value)   // 设置标签属性
getAttribute(key)         // 获取指定标签属性
 
/*
var atr = document.createAttribute("class");
atr.nodeValue="democlass";
document.getElementById('n1').setAttributeNode(atr);
*/
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <input type="button" value="全选"  onclick="CheckAll();"/>
    <input type="button" value="取消" onclick="CancelAll();"/>
    <input type="button" value="反选" onclick="ReverseCheck();"/>

    <table border="1" >
        <thead>

        </thead>
        <tbody id="tb">
            <tr>
                <td><input type="checkbox" /></td>
                <td>111</td>
                <td>222</td>
            </tr>
            <tr>
                <td><input type="checkbox" /></td>
                <td>111</td>
                <td>222</td>
            </tr>
            <tr>
                <td><input type="checkbox" /></td>
                <td>111</td>
                <td>222</td>
            </tr>
            <tr>
                <td><input type="checkbox" /></td>
                <td>111</td>
                <td>222</td>
            </tr>
        </tbody>
    </table>
    <script>
        function CheckAll(ths){
            var tb = document.getElementById('tb');
            var trs = tb.childNodes;
            for(var i =0; i<trs.length; i++){

                var current_tr = trs[i];
                if(current_tr.nodeType==1){
                    var inp = current_tr.firstElementChild.getElementsByTagName('input')[0];
                    inp.checked = true;
                }
            }
        }

        function CancelAll(ths){
            var tb = document.getElementById('tb');
            var trs = tb.childNodes;
            for(var i =0; i<trs.length; i++){

                var current_tr = trs[i];
                if(current_tr.nodeType==1){
                    var inp = current_tr.firstElementChild.getElementsByTagName('input')[0];
                    inp.checked = false;
                }
            }
        }

        function ReverseCheck(ths){
            var tb = document.getElementById('tb');
            var trs = tb.childNodes;
            for(var i =0; i<trs.length; i++){
                var current_tr = trs[i];
                if(current_tr.nodeType==1){
                    var inp = current_tr.firstElementChild.getElementsByTagName('input')[0];
                    if(inp.checked){
                        inp.checked = false;
                    }else{
                        inp.checked = true;
                    }
                }
            }
        }

    </script>
</body>
</html>

Demo
demo

3、class操作

className                // 获取所有样式类名(以字符串的形式返回,若要以数组的形式返回 classList)
classList.remove(cls)    // 删除指定样式类
classList.add(cls)       // 添加样式类

4、标签操作

a.创建标签

// 方式一
var tag = document.createElement('a')
tag.innerText = "baidu"
tag.className = "c1"
tag.href = "http://www.baidu.com"
 
// 方式二
var tag = "<a class='c1' href='http://www.baidu.com'>baidu</a>"

b.操作标签

// 方式一
var obj = "<input type='text' />";
xxx.insertAdjacentHTML("beforeEnd",obj);
xxx.insertAdjacentElement('afterBegin',document.createElement('p'))
 
//注意:第一个参数只能是'beforeBegin'、 'afterBegin'、 'beforeEnd'、 'afterEnd'
 
// 方式二
var tag = document.createElement('a')
xxx.appendChild(tag)
xxx.insertBefore(tag,xxx[1])

5、样式操作

var obj = document.getElementById('i1')
 
obj.style.fontSize = "32px";
obj.style.backgroundColor = "red";
 <input onfocus="Focus(this);" onblur="Blur(this);" id="search" value="请输入关键字" style="color: gray;" />

    <script>
        function Focus(ths){
            ths.style.color = "black";
            if(ths.value == '请输入关键字' || ths.value.trim() == ""){

                ths.value = "";
            }
        }

        function Blur(ths){
            if(ths.value.trim() == ""){
                ths.value = '请输入关键字';
                ths.style.color = 'gray';
            }else{
                ths.style.color = "black";
            }
        }
    </script>
demo

6、位置操作

//总文档高度
document.documentElement.offsetHeight
  
//当前文档占屏幕高度
document.documentElement.clientHeight
  
//自身高度
tag.offsetHeight
  
//距离上级定位高度
tag.offsetTop
  
//父定位标签
tag.offsetParent
  
//滚动高度
tag.scrollTop
 
/*
    clientHeight -> 可见区域:height + padding
    clientTop    -> border高度
    offsetHeight -> 可见区域:height + padding + border
    offsetTop    -> 上级定位标签的高度
    scrollHeight -> 全文高:height + padding
    scrollTop    -> 滚动高度
    特别的:
        document.documentElement代指文档根节点
*/
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body style="margin: 0;">
    <div style="height: 900px;">

    </div>
    <div style="padding: 10px;">
        <div id="i1" style="height:190px;padding: 2px;border: 1px solid red;margin: 8px;">
                <p>asdf</p>
                <p>asdf</p>
                <p>asdf</p>
                <p>asdf</p>
                <p>asdf</p>
        </div>
    </div>

    <script>
        var i1 = document.getElementById('i1');

        console.log(i1.clientHeight); // 可见区域:height + padding
        console.log(i1.clientTop);    // border高度
        console.log('=====');
        console.log(i1.offsetHeight); // 可见区域:height + padding + border
        console.log(i1.offsetTop);    // 上级定位标签的高度
        console.log('=====');
        console.log(i1.scrollHeight);   //全文高:height + padding
        console.log(i1.scrollTop);      // 滚动高度
        console.log('=====');

    </script>
</body>
</html>

test
test
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<style>

    body{
        margin: 0px;
    }
    img {
        border: 0;
    }
    ul{
        padding: 0;
        margin: 0;
        list-style: none;
    }
    .clearfix:after {
        content: ".";
        display: block;
        height: 0;
        clear: both;
        visibility: hidden;
    }

    .wrap{
        width: 980px;
        margin: 0 auto;
    }

    .pg-header{
        background-color: #303a40;
        -webkit-box-shadow: 0 2px 5px rgba(0,0,0,.2);
        -moz-box-shadow: 0 2px 5px rgba(0,0,0,.2);
        box-shadow: 0 2px 5px rgba(0,0,0,.2);
    }
    .pg-header .logo{
        float: left;
        padding:5px 10px 5px 0px;
    }
    .pg-header .logo img{
        vertical-align: middle;
        width: 110px;
        height: 40px;

    }
    .pg-header .nav{
        line-height: 50px;
    }
    .pg-header .nav ul li{
        float: left;
    }
    .pg-header .nav ul li a{
        display: block;
        color: #ccc;
        padding: 0 20px;
        text-decoration: none;
        font-size: 14px;
    }
    .pg-header .nav ul li a:hover{
        color: #fff;
        background-color: #425a66;
    }
    .pg-body{

    }
    .pg-body .catalog{
        position: absolute;
        top:60px;
        width: 200px;
        background-color: #fafafa;
        bottom: 0px;
    }
    .pg-body .catalog.fixed{
        position: fixed;
        top:10px;
    }

    .pg-body .catalog .catalog-item.active{
        color: #fff;
        background-color: #425a66;
    }

    .pg-body .content{
        position: absolute;
        top:60px;
        width: 700px;
        margin-left: 210px;
        background-color: #fafafa;
        overflow: auto;
    }
    .pg-body .content .section{
        height: 500px;
    }
</style>
<body onscroll="ScrollEvent();">
<div class="pg-header">
    <div class="wrap clearfix">
        <div class="logo">
            <a href="#">
                <img src="http://core.pc.lietou-static.com/revs/images/common/logo_7012c4a4.pn">
            </a>
        </div>
        <div class="nav">
            <ul>
                <li>
                    <a  href="#">首页</a>
                </li>
                <li>
                    <a  href="#">功能一</a>
                </li>
                <li>
                    <a  href="#">功能二</a>
                </li>
            </ul>
        </div>

    </div>
</div>
<div class="pg-body">
    <div class="wrap">
        <div class="catalog">
            <div class="catalog-item" auto-to="function1"><a>第1张</a></div>
            <div class="catalog-item" auto-to="function2"><a>第2张</a></div>
            <div class="catalog-item" auto-to="function3"><a>第3张</a></div>
        </div>
        <div class="content">
            <div menu="function1" class="section">
                <h1>第一章</h1>
            </div>
            <div menu="function2" class="section">
                <h1>第二章</h1>
            </div>
            <div menu="function3" class="section">
                <h1>第三章</h1>
            </div>
        </div>
    </div>

</div>
    <script>
        function ScrollEvent(){
            var bodyScrollTop = document.body.scrollTop;
            if(bodyScrollTop>50){
                document.getElementsByClassName('catalog')[0].classList.add('fixed');
            }else{
                document.getElementsByClassName('catalog')[0].classList.remove('fixed');
            }

        }
    </script>
</body>
</html>

Demo-滚动固定
滚动条固定
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<style>

    body{
        margin: 0px;
    }
    img {
        border: 0;
    }
    ul{
        padding: 0;
        margin: 0;
        list-style: none;
    }
    h1{
        padding: 0;
        margin: 0;
    }
    .clearfix:after {
        content: ".";
        display: block;
        height: 0;
        clear: both;
        visibility: hidden;
    }

    .wrap{
        width: 980px;
        margin: 0 auto;
    }

    .pg-header{
        background-color: #303a40;
        -webkit-box-shadow: 0 2px 5px rgba(0,0,0,.2);
        -moz-box-shadow: 0 2px 5px rgba(0,0,0,.2);
        box-shadow: 0 2px 5px rgba(0,0,0,.2);
    }
    .pg-header .logo{
        float: left;
        padding:5px 10px 5px 0px;
    }
    .pg-header .logo img{
        vertical-align: middle;
        width: 110px;
        height: 40px;

    }
    .pg-header .nav{
        line-height: 50px;
    }
    .pg-header .nav ul li{
        float: left;
    }
    .pg-header .nav ul li a{
        display: block;
        color: #ccc;
        padding: 0 20px;
        text-decoration: none;
        font-size: 14px;
    }
    .pg-header .nav ul li a:hover{
        color: #fff;
        background-color: #425a66;
    }
    .pg-body{

    }
    .pg-body .catalog{
        position: absolute;
        top:60px;
        width: 200px;
        background-color: #fafafa;
        bottom: 0px;
    }
    .pg-body .catalog.fixed{
        position: fixed;
        top:10px;
    }

    .pg-body .catalog .catalog-item.active{
        color: #fff;
        background-color: #425a66;
    }

    .pg-body .content{
        position: absolute;
        top:60px;
        width: 700px;
        margin-left: 210px;
        background-color: #fafafa;
        overflow: auto;
    }
    .pg-body .content .section{
        height: 500px;
        border: 1px solid red;
    }
</style>
<body onscroll="ScrollEvent();">
<div class="pg-header">
    <div class="wrap clearfix">
        <div class="logo">
            <a href="#">
                <img src="http://core.pc.lietou-static.com/revs/images/common/logo_7012c4a4.pn">
            </a>
        </div>
        <div class="nav">
            <ul>
                <li>
                    <a  href="#">首页</a>
                </li>
                <li>
                    <a  href="#">功能一</a>
                </li>
                <li>
                    <a  href="#">功能二</a>
                </li>
            </ul>
        </div>

    </div>
</div>
<div class="pg-body">
    <div class="wrap">
        <div class="catalog" id="catalog">
            <div class="catalog-item" auto-to="function1"><a>第1张</a></div>
            <div class="catalog-item" auto-to="function2"><a>第2张</a></div>
            <div class="catalog-item" auto-to="function3"><a>第3张</a></div>
        </div>
        <div class="content" id="content">
            <div menu="function1" class="section">
                <h1>第一章</h1>
            </div>
            <div menu="function2" class="section">
                <h1>第二章</h1>
            </div>
            <div menu="function3" class="section">
                <h1>第三章</h1>
            </div>
        </div>
    </div>

</div>
    <script>
        function ScrollEvent(){
            var bodyScrollTop = document.body.scrollTop;
            if(bodyScrollTop>50){
                document.getElementsByClassName('catalog')[0].classList.add('fixed');
            }else{
                document.getElementsByClassName('catalog')[0].classList.remove('fixed');
            }

            var content = document.getElementById('content');
            var sections = content.children;
            for(var i=0;i<sections.length;i++){
                var current_section = sections[i];

                // 当前标签距离顶部绝对高度
                var scOffTop = current_section.offsetTop + 60;

                // 当前标签距离顶部,相对高度
                var offTop = scOffTop - bodyScrollTop;

                // 当前标签高度
                var height = current_section.scrollHeight;

                if(offTop<0 && -offTop < height){
                    // 当前标签添加active
                    // 其他移除 active
                    var menus = document.getElementById('catalog').children;
                    var current_menu = menus[i];
                    current_menu.classList.add('active');
                    for(var j=0;j<menus.length;j++){
                        if(menus[j] == current_menu){

                        }else{
                            menus[j].classList.remove('active');
                        }
                    }
                    break;
                }

            }


        }
    </script>
</body>
</html>

Demo-滚动菜单
滚动菜单
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<style>

    body{
        margin: 0px;
    }
    img {
        border: 0;
    }
    ul{
        padding: 0;
        margin: 0;
        list-style: none;
    }
    h1{
        padding: 0;
        margin: 0;
    }
    .clearfix:after {
        content: ".";
        display: block;
        height: 0;
        clear: both;
        visibility: hidden;
    }

    .wrap{
        width: 980px;
        margin: 0 auto;
    }

    .pg-header{
        background-color: #303a40;
        -webkit-box-shadow: 0 2px 5px rgba(0,0,0,.2);
        -moz-box-shadow: 0 2px 5px rgba(0,0,0,.2);
        box-shadow: 0 2px 5px rgba(0,0,0,.2);
    }
    .pg-header .logo{
        float: left;
        padding:5px 10px 5px 0px;
    }
    .pg-header .logo img{
        vertical-align: middle;
        width: 110px;
        height: 40px;

    }
    .pg-header .nav{
        line-height: 50px;
    }
    .pg-header .nav ul li{
        float: left;
    }
    .pg-header .nav ul li a{
        display: block;
        color: #ccc;
        padding: 0 20px;
        text-decoration: none;
        font-size: 14px;
    }
    .pg-header .nav ul li a:hover{
        color: #fff;
        background-color: #425a66;
    }
    .pg-body{

    }
    .pg-body .catalog{
        position: absolute;
        top:60px;
        width: 200px;
        background-color: #fafafa;
        bottom: 0px;
    }
    .pg-body .catalog.fixed{
        position: fixed;
        top:10px;
    }

    .pg-body .catalog .catalog-item.active{
        color: #fff;
        background-color: #425a66;
    }

    .pg-body .content{
        position: absolute;
        top:60px;
        width: 700px;
        margin-left: 210px;
        background-color: #fafafa;
        overflow: auto;
    }
    .pg-body .content .section{
        height: 500px;
        border: 1px solid red;
    }
</style>
<body onscroll="ScrollEvent();">
<div class="pg-header">
    <div class="wrap clearfix">
        <div class="logo">
            <a href="#">
                <img src="http://core.pc.lietou-static.com/revs/images/common/logo_7012c4a4.pn">
            </a>
        </div>
        <div class="nav">
            <ul>
                <li>
                    <a  href="#">首页</a>
                </li>
                <li>
                    <a  href="#">功能一</a>
                </li>
                <li>
                    <a  href="#">功能二</a>
                </li>
            </ul>
        </div>

    </div>
</div>
<div class="pg-body">
    <div class="wrap">
        <div class="catalog" id="catalog">
            <div class="catalog-item" auto-to="function1"><a>第1张</a></div>
            <div class="catalog-item" auto-to="function2"><a>第2张</a></div>
            <div class="catalog-item" auto-to="function3"><a>第3张</a></div>
        </div>
        <div class="content" id="content">
            <div menu="function1" class="section">
                <h1>第一章</h1>
            </div>
            <div menu="function2" class="section">
                <h1>第二章</h1>
            </div>
            <div menu="function3" class="section" style="height: 200px;">
                <h1>第三章</h1>
            </div>
        </div>
    </div>

</div>
    <script>
        function ScrollEvent(){
            var bodyScrollTop = document.body.scrollTop;
            if(bodyScrollTop>50){
                document.getElementsByClassName('catalog')[0].classList.add('fixed');
            }else{
                document.getElementsByClassName('catalog')[0].classList.remove('fixed');
            }

            var content = document.getElementById('content');
            var sections = content.children;
            for(var i=0;i<sections.length;i++){
                var current_section = sections[i];

                // 当前标签距离顶部绝对高度
                var scOffTop = current_section.offsetTop + 60;

                // 当前标签距离顶部,相对高度
                var offTop = scOffTop - bodyScrollTop;

                // 当前标签高度
                var height = current_section.scrollHeight;

                if(offTop<0 && -offTop < height){
                    // 当前标签添加active
                    // 其他移除 active

                    // 如果已经到底部,现实第三个菜单
                    // 文档高度 = 滚动高度 + 视口高度

                    var a = document.getElementsByClassName('content')[0].offsetHeight + 60;
                    var b = bodyScrollTop + document.documentElement.clientHeight;
                    console.log(a+60,b);
                    if(a == b){
                        var menus = document.getElementById('catalog').children;
                        var current_menu = document.getElementById('catalog').lastElementChild;
                        current_menu.classList.add('active');
                        for(var j=0;j<menus.length;j++){
                            if(menus[j] == current_menu){

                            }else{
                                menus[j].classList.remove('active');
                            }
                        }
                    }else{
                        var menus = document.getElementById('catalog').children;
                        var current_menu = menus[i];
                        current_menu.classList.add('active');
                        for(var j=0;j<menus.length;j++){
                            if(menus[j] == current_menu){

                            }else{
                                menus[j].classList.remove('active');
                            }
                        }
                    }




                    break;
                }

            }


        }
    </script>
</body>
</html>

Demo-滚动高度
滚动高度

7、提交表单

document.geElementById('form').submit()

8、其他操作

console.log                 //输出框
alert                       //弹出框
confirm                     //确认框
  
// URL和刷新
location.href               //获取URL
location.href = "url"      // 重定向
location.reload()           //重新加载
  
// 定时器
setInterval                 //多次定时器
clearInterval               //清除多次定时器
setTimeout                  //单次定时器
clearTimeout                //清除单次定时器

 

posted @ 2017-03-16 10:26  似是故人来~  阅读(165)  评论(0编辑  收藏  举报