Web Front-endJS TutorialA brief analysis of the differences between html(), text(), and val() in JQuery_jqueryA brief analysis of the differences between html(), text(), and val() in JQuery_jquery
1.HTML
html(): Get the html content of the first matching element. This function cannot be used with XML documents. But can be used for XHTML documents
html(val): Set the html content of each matching element. This function cannot be used with XML documents. But it can be used for XHTML documents.
2.TEXT
text(): Get the content of all matching elements.
The result is the text combined from the text content contained in all matching elements. This method works for both HTML and XML documents.
text(val): Set the text content of all matching elements
Similar to html(), but will encode HTML (replace "" with corresponding HTML entities).
3.VAL
val(): Get the current value of the first matching element.
val(val): Set the value of each matching element.
The above content is copied from the JQuery help document, so I won’t go into too much nonsense. Here are some exercises I did, the code is as follows:
While doing the exercises, I discovered another difference between html and text
Whenhtml() removes the content of an element, the format under the selected element can also be retrieved.
For example:
If we use var strHTML = $("#divShow").html(); to get it,
The result is:Write Less Do More
If we use var strHTML2 = $("#divShow b i").html(); to get it
The result is Write Less Do More
And text does not have the first situation,
If we take var strText = $("#divShow").text();
The result is Write Less Do More
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<script src="js/jquery.js" type="text/javascript"></script>
<!--
<script src="http://code.jquery.com/jquery-latest.js"></script>
-->
<title> 获取或设置元素的内容</title>
<style type="text/css">
body{font-size:15px;text-align:center}
div{border:solid 0px #666;padding:5px;width:220px;margin:5px}
</style>
<script type="text/javascript">
$(function() {
var strHTML = $("#divShow").html();// 获取HTML 内容(包含div下面的两个格式)
var strHTML2 = $("#divShow b i").html(); //获取HTML内容
var strHTML3 = $("div").html();
var strText = $("#divShow").text();// 获取文本内容
var strText2 = $("div").text();
$("#divHTML").html(strHTML);// 设置HTML 内容
$("#divHTML2").html(strHTML2); //设置HTML内容
$("#divHTML3").html(strHTML3); //设置HTML内容
$("p").html(strHTML);
$("#divText").text(strText);// 设置文本内容
$("#divText2").text(strText2);// 设置文本内容
$("a").text(strText);
$("select").change(function() { // 设置列表框change 事件
// 获取列表框所选中的全部选项的值
alert($("select").val());
var strSel = $("select").val().join(",");
$("input").val(strSel); // 显示列表框所选中的全部选项的值
})
})
</script>
</head>
<body>
<table border="1" bordercolor="#A9A9A9" cellspacing="0">
<tr><td>******************************</td><td>*******************************************</td></tr>
<tr>
<td><div id="divShow"><b><i>Write Less Do More</i></b></div></td>
<td>这是原内容</td>
</tr>
<tr>
<td><div id="divShow"><b><i>Write XXXX Do XXXX</i></b></div></td>
<td>这是原内容</td>
</tr>
<tr><td>******************************</td><td>*******************************************</td></tr>
<tr>
<td><div id="divHTML">1</div></td>
<td>获取原内容(连带内容的格式)后以html方式输出</td>
</tr>
<tr>
<td><div id="divHTML2">2</div></td>
<td>获取原内容(不带内容的格式)后以html方式输出</td>
</tr>
<tr>
<td><div id="divHTML3">3</div></td>
<td>获取原内容(获取第一个匹配元素的内容)后以html方式输出</td>
</tr>
<tr>
<td><p></p></td>
<td>HTML方式设置段落的文本</td>
</tr>
<tr>
<td><p></p></td>
<td>如果这个也有内容了，就是设置每个匹配元素的内容</td>
</tr>
<tr><td>******************************</td><td>*******************************************</td></tr>
<tr>
<td><div id="divText">4</div></td>
<td>获取原内容后以text方式输出</td>
</tr>
<tr>
<td><div id="divText2"></div></td>
<td>获取原内容(获取所有匹配元素的内容)后以text方式输出</td>
</tr>
<tr>
<td><a></a></td>
<td>TEXT方式设置段落的文本</td>
</tr>
<tr>
<td><a></a></td>
<td>如果这个也有内容了，就是设置每个匹配元素的内容</td>
</tr>
<tr><td>******************************</td><td>*******************************************</td></tr>
<tr>
<td>
<select multiple="multiple"style="height:96px;width:85px">
<option value="1">Item 1</option>
<option value="2">Item 2</option>
<option value="3">Item 3</option>
<option value="4">Item 4</option>
<option value="5">Item 5</option>
<option value="6">Item 6</option>
</select>
<select>
<option value="7">Item 7</option>
<option value="8">Item 8</option>
<option value="9" selected>Item 9</option>
</select>
</td>
<td>
</td>
</tr>
<tr>
<td><input ></input></td>
<td><input ></input></td>
</tr>
</table>
</body>
</html>
You can also verify it yourself. The above is an experiment I did. The JQuery I used is 1.6
To summarize:
.html() is used to read and modify the HTML tag of the element
.text() is used to read or modify the plain text content of the element
.val() is used to read or modify the value of a form element.
Comparison of the functions of these three methods
.html(), .text(), and .val() are all used to read the content of the selected element; only .html() is used to read the HTML content of the element (including its Html tag), .text() is used to read the plain text content of the element, including its descendant elements, and .val() is used to read the "value" value of the form element. Among them, the .and .text() methods cannot be used on form elements, and .val() can only be used on form elements; in addition, when the .html() method is used on multiple elements, only the first element is read; The .val() method is the same as .html(). If it is applied to multiple elements, only the "value" value of the first form element can be read, but .text() is different from them. If .text () When applied to multiple elements, the text content of all selected elements will be read.
.html(htmlString), .text(textString) and .val(value) are all used to replace the content of the selected element. If the three methods are used on multiple elements at the same time, they will be replaced. The contents of all selected elements.
.html(), .text(), and .val() can all use the return value of the callback function to dynamically change the content of multiple elements.
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