Jquery w3schools 3 :Jquery HTML

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GIáo trình từ w3schools

 

 

 

3. Jquery HTML

3.1 jQuery – Get Content and Attributes

Get Content – text(), html(), and val()

 

text () – Bộ hoặc trả về nội dung văn bản của các yếu tố lựa chọn
html () – Bộ hoặc trả về nội dung của các yếu tố được lựa chọn (bao gồm cả đánh dấu HTML)
val () – Bộ hoặc trả về giá trị của các trường mẫu

$("#btn1").click(function(){
  alert("Value: " + $("#test").val());
});

$("#btn1").click(function(){
  alert("Text: " + $("#test").text());
});
$("#btn2").click(function(){
  alert("HTML: " + $("#test").html());
});

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
alert("Value: " + $("#test").val());
});
});
</script>
</head>

<body>
<p>Name: <input type="text" id="test" value="Mickey Mouse"></p>
<button>Show Value</button>
</body>
</html>

Get Attributes – attr()

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
alert($("#w3s").attr("href"));
});
});
</script>
</head>

<body>
<p><a href="http://www.w3schools.com" id="w3s">W3Schools.com</a></p>
<button>Show href Value</button>
</body>
</html>

3.2jQuery – Set Content and Attributes

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/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("Dolly Duck");
});
});
</script>
</head>

<body>
<p id="test1">This is a paragraph.</p>
<p id="test2">This is another paragraph.</p>
<p>Input field: <input type="text" id="test3" value="Mickey Mouse"></p>
<button id="btn1">Set Text</button>
<button id="btn2">Set HTML</button>
<button id="btn3">Set Value</button>
</body>
</html>

 

A Callback Function for text(), html(), and val()

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("#btn1").click(function(){
$("#test1").text(function(i,origText){
return "Old text: " + origText + " New text: Hello world! (index: " + i + ")";
});
});

$("#btn2").click(function(){
$("#test2").html(function(i,origText){
return "Old html: " + origText + " New html: Hello <b>world!</b> (index: " + i + ")";
});
});

});
</script>
</head>

<body>
<p id="test1">This is a <b>bold</b> paragraph.</p>
<p id="test2">This is another <b>bold</b> paragraph.</p>
<button id="btn1">Show Old/New Text</button>
<button id="btn2">Show Old/New HTML</button>
</body>
</html>

Set Attributes – attr()

$("button").click(function(){
  $("#w3s").attr("href","http://www.w3schools.com/jquery");
});

$("button").click(function(){
  $("#w3s").attr({
    "href" : "http://www.w3schools.com/jquery",
    "title" : "W3Schools jQuery Tutorial"
  });
});

A Callback Function for attr()

$("button").click(function(){
  $("#w3s").attr("href", function(i,origValue){
    return origValue + "/jquery"; 
  });
});

3.2 jQuery – Add Elements

  • append() – Inserts content at the end of the selected elements
  • prepend() – Inserts content at the beginning of the selected elements
  • after() – Inserts content after the selected elements
  • before() – Inserts content before the selected elements

$("p").append("Some appended text.");

Phương pháp jQuery append () chèn nội dung CUỐI của các phần tử HTML được lựa chọn.

$("p").prepend("Some prepended text.");

Phương pháp jQuery append () chèn nội dung Đầu của các phần tử HTML được lựa chọn.

Add Several New Elements With append() and prepend()

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
function appendText()
{
var txt1="<p>Text.</p>"; // Create text with HTML
var txt2=$("<p></p>").text("Text."); // Create text with jQuery
var txt3=document.createElement("p");
txt3.innerHTML="Text."; // Create text with DOM
$("body").append(txt1,txt2,txt3); // Append new elements
}
</script>
</head>
<body>

<p>This is a paragraph.</p>
<button onclick="appendText()">Append text</button>

</body>
</html>

jQuery after() and before() Methods

$("img").after("Some text after");

$("img").before("Some text before");

Add Several New Elements With after() and before()

function afterText()
{
var txt1="<b>I </b>";                    // Create element with HTML  
var txt2=$("<i></i>").text("love ");     // Create with jQuery
var txt3=document.createElement("big");  // Create with DOM
txt3.innerHTML="jQuery!";
$("img").after(txt1,txt2,txt3);          // Insert new elements after img
}

3.2 jQuery – Remove Elements

  • remove() – Removes the selected element (and its child elements)
  • empty() – Removes the child elements from the selected element

 

$("#div1").remove();

$("#div1").empty();

Xóa các phần tử p có class="italic":  

$("p").remove(".italic");

3.3 jQuery – Get and Set CSS Classes

ví dụ file css

.important
{
font-weight:bold;
font-size:xx-large;
}

.blue
{
color:blue;
}

$("button").click(function(){
  $("h1,h2,p").addClass("blue");
  $("div").addClass("important");
});

$("button").click(function(){
  $("#div1").addClass("important blue");
});

jQuery removeClass() Method

$("button").click(function(){
  $("h1,h2,p").removeClass("blue");
});

toggle class

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1,h2,p").toggleClass("blue");
});
});
</script>
<style type="text/css">
.blue
{
color:blue;
}
</style>
</head>
<body>

<h1>Heading 1</h1>
<h2>Heading 2</h2>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
<button>Toggle class</button>
</body>
</html>

3.4 jQuery – css() Method

css("propertyname");  

$("p").css("background-color");

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
alert("Background color = " + $("p").css("background-color"));
});
});
</script>
</head>

<body>
<h2>This is a heading</h2>
<p style="background-color:#ff0000">This is a paragraph.</p>
<p style="background-color:#00ff00">This is a paragraph.</p>
<p style="background-color:#0000ff">This is a paragraph.</p>
<button>Return background-color of p</button>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("p").css("background-color","yellow");
});
});
</script>
</head>

<body>
<h2>This is a heading</h2>
<p style="background-color:#ff0000">This is a paragraph.</p>
<p style="background-color:#00ff00">This is a paragraph.</p>
<p style="background-color:#0000ff">This is a paragraph.</p>
<p>This is a paragraph.</p>
<button>Set background-color of p</button>
</body>
</html>

 

Set Multiple CSS Properties

 

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("p").css({"background-color":"yellow","font-size":"200%"});
});
});
</script>
</head>

<body>
<h2>This is a heading</h2>
<p style="background-color:#ff0000">This is a paragraph.</p>
<p style="background-color:#00ff00">This is a paragraph.</p>
<p style="background-color:#0000ff">This is a paragraph.</p>
<p>This is a paragraph.</p>
<button>Set multiple styles for p</button>
</body>
</html>

 

jQuery – Dimensions

  • width()
  • height()
  • innerWidth()
  • innerHeight()
  • outerWidth()
  • outerHeight()

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
var txt="";
txt+="Width of div: " + $("#div1").width() + "</br>";
txt+="Height of div: " + $("#div1").height();
$("#div1").html(txt);
});
});
</script>
</head>
<body>

<div id="div1" style="height:100px;width:300px;padding:10px;margin:3px;border:1px solid blue;background-color:lightblue;"></div>
<br>
<button>Display dimensions of div</button>
<p>width() – returns the width of an element.</p>
<p>height() – returns the height of an element.</p>

</body>
</html>

 

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
var txt="";
txt+="Width of div: " + $("#div1").width() + "</br>";
txt+="Height of div: " + $("#div1").height() + "</br>";
txt+="Inner width of div: " + $("#div1").innerWidth() + "</br>";
txt+="Inner height of div: " + $("#div1").innerHeight();
$("#div1").html(txt);
});
});
</script>
</head>

<body>
<div id="div1" style="height:100px;width:300px;padding:10px;margin:3px;border:1px solid blue;background-color:lightblue;"></div>
<br>

<button>Display dimensions of div</button>
<p>innerWidth() – returns the width of an element (includes padding).</p>
<p>innerHeight() – returns the height of an element (includes padding).</p>

</body>
</html>

$("button").click(function(){
  var txt="";
  txt+="Outer width: " + $("#div1").outerWidth() + "</br>";
  txt+="Outer height: " + $("#div1").outerHeight();
  $("#div1").html(txt);
});

 

$("button").click(function(){
  var txt="";
  txt+="Outer width (+margin): " + $("#div1").outerWidth(true) + "</br>";
  txt+="Outer height (+margin): " + $("#div1").outerHeight(true);
  $("#div1").html(txt);
});

 

$("button").click(function(){
  var txt="";
  txt+="Document width/height: " + $(document).width();
  txt+="x" + $(document).height() + "\n";
  txt+="Window width/height: " + $(window).width();
  txt+="x" + $(window).height();
  alert(txt);
});

Chú ý sezire

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").width(500).height(500);
});
});
</script>
</head>
<body>

<div id="div1" style="height:100px;width:300px;padding:10px;margin:3px;border:1px solid blue;background-color:lightblue;"></div>
<br>
<button>Resize div</button>

</body>
</html>

 

 

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