Showing posts with label JQUERY. Show all posts
Showing posts with label JQUERY. Show all posts

Wednesday, August 13, 2014

Handling Attributes of an Element in JQuery

INTRODUCTION

Attributes define the actual element's style, id etc for any element. For example, element <div> will have attributes like.
  • id
  • style
  • align
  • lang
  • title
Now we will see how can we get the existing value of these attribute and also how to reset the values by the following example.

Example Program

attributes.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Attributes Setter/Getter</title>
</head>
<script type="text/javascript" src="lib/jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="js/attributes.js"></script>

<body>
 <div id="myDiv" style="background: red; width: 200px" align="left" lang="en" title="MySampleDiv">MyDivContent</div>
 <input type="button" id="btn" value="Attributes" />
 <br>
 <br>
 <table border="1">
   <tr>
     <td id="td1"></td>
     <td id="td2"></td>
     <td id="td3"></td>
     <td id="td4"></td>
   </tr>
 </table>

</body>
</html>

attributes.js
$(document).ready(function() {
 $("#btn").click(function() {
   // Get the existing attribute values
   $("#td1").text($("#myDiv").attr("style"));
   $("#td2").text($("#myDiv").attr("align"));
   $("#td3").text($("#myDiv").attr("title"));
   $("#td4").text($("#myDiv").attr("lang"));

   // Reset the existing attribute values
   $("#td1").text($("#myDiv").attr('style', 'background:blue'));
   $("#td2").text($("#myDiv").attr("align", 'right'));
   $("#td2").text($("#myDiv").attr("title", "NewDivValue"));
   $("#td2").text($("#myDiv").attr("lang", "jp"));

 });
});

How to handle styles in JQuery

In this example, we will learn how to add or remove styles in Jquery.

Syntax to Apply Style

$("#elementId").addClass("cssClassName");

Syntax to Remove Style

$("#elementId").removeClass("cssClassName");

Example Program

addRemoveCss.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JQuery CSS Example</title>
<link type="text/css" href="styles/addRemoveCss.css" rel="stylesheet" />
</head>
<script type="text/javascript" src="lib/jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="js/addRemoveCss.js"></script>

<body>
 <input type="button" id="changeColorBtn" value="Change Color" />
 <br>
 <br>
 <div id="myDiv" style="width: 375px">Div</div>
</body>
</html>

addRemoveCss.css
@CHARSET "ISO-8859-1";

.redColor {
 background: red;
}

.blueColor {
 background: blue;
}

addRemoveCss.js
$(document).ready(function() {
 $("#changeColorBtn").click(function() {
   $("#myDiv").addClass("redColor");
   alert("redColor added");
   $("#myDiv").addClass("blueColor");
   alert("blueColor added.....");
   $("#myDiv").removeClass("blueColor");
   alert("blueColor removed");
 });
});

How to enable or disable an element using JQuery

Syntax to Enable An Element

$('#submitbutton').prop("disabled", false);

Syntax to Disable An Element

$('#submitbutton').prop("disabled", true);

Example Program

enableDisableElement.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JQuery Example</title>
</head>
<script type="text/javascript" src="lib/jquery-1.8.0.min.js"></script>
<script type="text/javascript" src="js/enableDisableInJQuery.js"></script>

<body>
 <table>
   <tr>
     <td><input type="text" id="myTextBox" value="Hi Dear" /></td>
   </tr>
   <tr>
     <td><input type="button" id="disableTxt" value="Disable Text" /></td>
     <td><input type="button" id="enableTxt" value="Enable Text" /></td>
   </tr>
 </table>
</body>
</html>

enableDisableElement.js
$(document).ready(function() {
 $("#disableTxt").click(function() {
   $("#myTextBox").prop("disabled", true);
 }),

 $("#enableTxt").click(function() {
   $("#myTextBox").prop("disabled", false);
 });
});