Web Front-endJS TutorialJavaScript implements automatic generation of web page elements (buttons, text, etc.)_javascript skills
Methods to create elements:
- 1. Use createTextNode() to create a text object
- 2. Use createElement() to create a label object
- 3. Directly use an attribute in the container tag: innerHTML - essentially changing the "html code" in the tag container is not an operation of the object tree as we think
Detailed code:
<body> <input type="button" value="创建并添加节点1" onclick="addNode1()"/> <input type="button" value="创建并添加节点2" onclick="addNode2()"/> <input type="button" value="创建并添加节点3" onclick="addNode3()"/> <input type="button" value="remove节点1 " onclick='removenode()'/> <input type="button" value="replaceNode节点2替换 " onclick='remove2()'/><!--1替换2，并且1没有保留--> <input type="button" value="clone替换 " onclick='clone()'/> <div id="div_id1">这是div模块--</div> <div id="div_id2">必须好好地学习，这样才能让自己有很好的回报</div> <div id="div_id3">好好干，加油↖(^ω^)↗</div> <div id="div_id4">你懂得区域，实验区域</div> </body>
Method 1: Create a text document
<span style="font-size:18px;">function addNode1(){
//1利用createTextNode()创建一个文本对象
var text=document.createTextNode("这是修改的，创建的文档");
//2获取div对象
var node1=document.getElementById("div_id1");
//添加成div对象的孩子
node1.appendChild(text);}</span><span style="font-size:24px;">
</span>
Method 2: Use createElement() to create a label object
function addNode2(){
//1,利用createElement（）创建一个标签对象
var nn=document.createElement("input");
nn.type="button"
nn.value="创建的按钮";
nn.target="_blank";
//2,获得div对象
var node2=document.getElementById("div_id2");
//添加成div对象的孩子
node2.appendChild(nn);
}
Method 3: Directly use an attribute in the container tag: innerHTML-----essentially changing the "html code" in the tag container, which is not an object tree operation as we think
function addNode3(){
var mm=document.getElementById("div_id3");
mm.innerHTML="<a href='http://www.baidu.com'><input type='button' value='新建的按钮'></a>";
}
- Delete node
Use removeNode and removeChild to delete child nodes from an element. The second method is usually used
function removenode(){
var node =document.getElementById("div_id4");
// alert(node.nodeName);//DIV
// 自杀式 node.removeNode(true); //removeNode 从文档层次中删除对象。ie可以出现现象，一般不采用自杀式
node.parentNode.removeChild(node);////通过父节点去删除它的孩子,一般常用
alert("aa");
}
- Replacement does not retain the replaced one
function remove2(){
var node1 =document.getElementById("div_id1");
var node2 =document.getElementById("div_id2");
// node1.replaceNode(node2);//自杀式不通用
////通过父节点去替换它的孩子：用node1去替换node2
node1.parentNode.replaceChild(node1,node2);//object.replaceChild(oNewNode, oChildNode)
}
- clone node
function clone(){
var node1 =document.getElementById("div_id1");
var node2 =document.getElementById("div_id2");
var node1_2=node1.cloneNode(true);//false只能clone基本的，不会clone下面的其他子节点
//克隆一个对象,默认参数为false。参数为true时，连子节点一起克隆
node1.parentNode.replaceChild(node1_2,node2);
}
Rendering:
Full source code:
<!DOCTYPE html>
<html>
<head>
<title>DOM_operation.html</title>
<style type="text/css">
div{
border:#00f solid 1px;
width:200px;
height:100px;
}
</style>
<script type="text/javascript">
//AAAA 增
//方式一 创建文本文档
function addNode1(){
//1利用createTextNode()创建一个文本对象
var text=document.createTextNode("这是修改的，创建的文档");
//2获取div对象
var node1=document.getElementById("div_id1");
//添加成div对象的孩子
node1.appendChild(text);
}
function addNode2(){
//1,利用createElement（）创建一个标签对象
var nn=document.createElement("input");
nn.type="button"
nn.value="创建的按钮";
nn.target="_blank";
//2,获得div对象
var node2=document.getElementById("div_id2");
//添加成div对象的孩子
node2.appendChild(nn);
}
//直接利用容器标签中的一个属性：innerHTML-----本质上改该标签容器中的“html代码”，不是我们认为的对象树的操作
function addNode3(){
var mm=document.getElementById("div_id3");
mm.innerHTML="<a href='http://www.baidu.com'><input type='button' value='新建的按钮'></a>";
}
//BBBBBB-------删
//删除节点 使用 removeNode 和 removeChild 从元素上删除子结点两种方法，通常采用第二种方法
function removenode(){
var node =document.getElementById("div_id4");
// alert(node.nodeName);//DIV
// 自杀式 node.removeNode(true); //removeNode 从文档层次中删除对象。ie可以出现现象，一般不采用自杀式
node.parentNode.removeChild(node);////通过父节点去删除它的孩子,一般常用
alert("aa");
}
//替换 没有保留替换的那个
function remove2(){
var node1 =document.getElementById("div_id1");
var node2 =document.getElementById("div_id2");
// node1.replaceNode(node2);//自杀式不通用
////通过父节点去替换它的孩子：用node1去替换node2
node1.parentNode.replaceChild(node1,node2);//object.replaceChild(oNewNode, oChildNode)
}
function clone(){
var node1 =document.getElementById("div_id1");
var node2 =document.getElementById("div_id2");
var node1_2=node1.cloneNode(true);//false只能clone基本的，不会clone下面的其他子节点
//克隆一个对象,默认参数为false。参数为true时，连子节点一起克隆
node1.parentNode.replaceChild(node1_2,node2);
}
</script>
</head>
<body>
<input type="button" value="创建并添加节点1" onclick="addNode1()"/>
<input type="button" value="创建并添加节点2" onclick="addNode2()"/>
<input type="button" value="创建并添加节点3" onclick="addNode3()"/>
<input type="button" value="remove节点1 " onclick='removenode()'/>
<input type="button" value="replaceNode节点2替换 " onclick='remove2()'/><!--1替换2，并且1没有保留-->
<input type="button" value="clone替换 " onclick='clone()'/>
<div id="div_id1">这是div模块--</div>
<div id="div_id2">必须好好地学习，这样才能让自己有很好的回报</div>
<div id="div_id3">好好干，加油↖(^ω^)↗</div>
<div id="div_id4">你懂得区域，实验区域</div>
</body>
</html>
The above is to share with you how to automatically generate web page elements through JavaScript. I hope it will be helpful to your learning.
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