jQuery-Settings
jQuery - Setting content and attributes
##Setting content - text(), html() and val()
- text() - Set or Returns the text content of the selected element
- html() - Sets or returns the content of the selected element (including HTML tags)
- val( ) - Set or return the value of a form field
Example
Run instance»Click the "Run instance" button to view the online instance
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("#btn1").click(function(){
$("#test1").text("Hello world!");
});
$("#btn2").click(function(){
$("#test2").html("<b>Hello world!</b>");
});
$("#btn3").click(function(){
$("#test3").val("RUNOOB");
});
});
</script>
</head>
<body>
<p id="test1">这是一个段落。</p>
<p id="test2">这是另外一个段落。</p>
<p>输入框: <input type="text" id="test3" value="菜鸟教程"></p>
<button id="btn1">设置文本</button>
<button id="btn2">设置 HTML</button>
<button id="btn3">设置值</button>
</body>
</html>Run instance»Click the "Run instance" button to view the online instance
The callback functions of text(), html() and val()
Example
Run Instance»Click the "Run Instance" button to view the online instance
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("#btn1").click(function(){
$("#test1").text(function(i,origText){
return "旧文本: " + origText + " 新文本: Hello world! (index: " + i + ")";
});
});
$("#btn2").click(function(){
$("#test2").html(function(i,origText){
return "旧 html: " + origText + " 新 html: Hello <b>world!</b> (index: " + i + ")";
});
});
});
</script>
</head>
<body>
<p id="test1">这是一个有 <b>粗体</b> 字的段落。</p>
<p id="test2">这是另外一个有 <b>粗体</b> 字的段落。</p>
<button id="btn1">显示 新/旧 文本</button>
<button id="btn2">显示 新/旧 HTML</button>
</body>
</html>Run Instance»Click the "Run Instance" button to view the online instance
Set attributes - attr()
The jQuery attr() method is also used to set/change attribute values. The following example demonstrates how to change (set) the value of the href attribute in the link:Example
Running Example »Click the "Run Instance" button to view the online instance
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#runoob").attr("href","http://www.php.cn/jquery");
});
});
</script>
</head>
<body>
<p><a href="http://www.runoob.com" id="runoob">php中文网</a></p>
<button>修改 href 值</button>
<p>点击按钮修改后，可以点击链接查看链接地址是否变化。</p>
</body>
</html>Running Example »Click the "Run Instance" button to view the online instance
##attr() method Also allows you to set multiple properties at the same time.
The following example demonstrates how to set the href and title attributes at the same time:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#runoob").attr({
"href" : "http://www.runoob.com/jquery",
"title" : "jQuery 教程"
});
});
});
</script>
</head>
<body>
<p><a href="http://www.php.cn" id="runoob">php中文网</a></p>
<button>修改 href 和 title</button>
<p>点击按钮修改后，可以查看 href 和 title 是否变化。</p>
</body>
</html>
Click the "Run instance" button to view the online instance
attr() callback function
jQuery method attr() also provides a callback function. The callback function takes two parameters: the index of the current element in the selected element list, and the original (old) value. Then return the string you wish to use as the function's new value.
The following example demonstrates the attr() method with a callback function:
Example
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#runoob").attr("href", function(i, origValue){
return origValue + "/jquery";
});
});
});
</script>
</head>
<body>
<p><a href="http://www.php.cn" id="runoob">php中文网</a></p>
<button>修改 href 值</button>
<p>点击按钮修改后，可以点击链接查看 href 属性是否变化。</p>
</body>
</html>Running Example»
Click the "Run Instance" button to view the online instance
