Set content - text(), html() and val()
Use the same three methods from the previous chapter to set content:
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() - Sets or returns the value of a form field
<!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("欢迎!");
});
$("#btn2").click(function(){
$("#test2").html("<b>Hello world!</b>");
});
$("#btn3").click(function(){
$("#test3").val("php");
});
});
</script>
</head>
<body>
<p id="test1">段落1</p>
<p id="test2">段落2</p>
<p>输入框: <input type="text" id="test3" value="php中文网"></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>Callback functions of text(), html() and val()
The above three jQuery methods: text(), html() and val() also have callback functions.
The callback function takes two parameters:
The subscript of the current element in the selected element list, and the original (old) value.
Then return the string you wish to use as the new value of the function.
<!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>
attr()Set attributes
attr() method allows You set multiple properties 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(){
$("#php").attr({
"href" : "http://www.php.cn/jquery",
"title" : "jQuery 教程"
});
});
});
</script>
</head>
<body>
<p><a href="http://www.php.cn" id="php">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>attr() callback function
The callback function takes two parameters:
The subscript of the current element in the selected element list, and the original (old) value .
Then return the string you wish to use as the new value of the function.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文网(php.cn)</title>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#php").attr("href", function(i, origValue){
return origValue + "/jquery";
});
});
});
</script>
</head>
<body>
<p><a href="http://www.php.cn" id="php">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>
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