jQuery plugins & JSON

iFour ConsultancyjQuery Plugins & JSON

 JQuery Plugins
 How to use Plugins
 How to develop a Plugin
 Jquery Plugin Examples
 Introduction to JSON
 JSON Objects
 Arrays in JSON
 Data types : Objects and Arrays
INDEX
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 Simply a new method that we use to extend jQuery's prototype object. By extending the
prototype object you enable all jQuery objects to inherit any methods that you add.
 As established, whenever you call JQuery() you're creating a new jQuery object, with all of
jQuery's methods inherited.
 The idea of a plugin is to do something with a collection of elements. You could consider
each method that comes with the jQuery core a plugin, like .fadeout() and .addclass()
JQuery Plugins
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 Following example shows how to include jquery.plug-in.js plugin
How to use Plugins
<head>
<title>The jQuery Example</title>
<script type = "text/javascript" src =
"https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src = "jquery.plug-in.js" type = "text/javascript"></script>
<script src = "custom.js" type = "text/javascript"></script>
<script type = "text/javascript" language = "javascript">
$(document).ready(function() {
.......your custom code.....
});
</script>
</head>
<body>
.......
</body>

 Any methods or functions you attach must have a semicolon (;) at the end
 Your method must return the jQuery object, unless explicitly noted otherwise
 You should use this.each to iterate over the current set of matched elements - it
produces clean and compatible code that way
 Prefix the filename with jQuery, follow that with the name of the plugin and
conclude with .js
 Always attach the plugin to jQuery directly instead of $, so users can use a custom
alias via noConflict() method
How to develop a plug-in

How to develop a plug-in : Example
 Keep this code in custom.js file
 Html page
JQuery.fn.warning = funcation(){
Return this.each(function(){
alert(‘Tag Name :”’+ $(this).prop(“tagname”) + ‘”.’);
});
};
<script type=“text/javascript”>
$(document).ready(function(){
$(“div”).warning();
$(“p”).warning();
});
</script>

jQuery Plug-in : Chosen
jQuery plug-in that makes long, unwieldy select boxes much more user-friendly
Has a number of options and attributes that allow you to have full control of your select
boxes
• Standard Select
• Multiple Select
• <optgroup > Support
• Selected and Disabled Support
• Hide Search on Single Select
• Default Text Support
• No Results Text Support
• Limited Selected Options in MultiSelect
• Allow Deselect on Single Selects
• Right to Left Support
• Observing, Updating, and Destroying Chosen
• Custom Width Support
For more info refer this link : https://harvesthq.github.io/chosen/

jQuery Plug-in : Chosen - Example
Standard Select

Multiple Select
jQuery Plug-in : Chosen - Example

jQuery Plug-in : Select2
It gives you a customizable select box with support for searching, tagging, remote
data sets, infinite scrolling, and many other highly used options
Supports a wide variety of options that allow you to customize it to your needs
• Single select boxes
• Multiple select boxes
• Placeholders
• Data sources
• Disabled mode
• Disabled results
• Limiting the number of selections
• Hiding the search box
• Tagging Support
For more info refer this link : https://select2.github.io/examples.html

jQuery Plug-in : Select2- Example
Single select boxes

jQuery Plug-in : Select2- Example
Multiple select boxes

What is JSON?
 A lightweight text based data-interchange format
 Completely language independent
 Based on a subset of the JavaScript Programming Language
 Easy to understand, manipulate and generate
 JSON is not a
• Overly Complex
• A “document” format
• A markup language
• A programming language

JSON Object Syntax
 Unordered sets of name/values pairs
 Begins with { (left brace)
 Ends with } (right brace)
 Each name followed by : (colon)
 Name/value pairs are separated by , (comma)
 Example :
var employee = {
"employee_id": 1234,
"name": “ifour",
"hire_date": "1/1/2016",
"location": "Ahmedabad",
"consultant": false
};

 An ordered collection of values
 Begins with [ (left bracket)
 Ends with ] (right bracket)
 Name/value pairs are separated by , (comma)
 Example :
Arrays in JSON
var employee = {
"employee_id": 123,
"name": “ifour",
"hire_date": “01/01/2013",
"location": "Ahmedabad",
"consultant": false,
"random_nums": [ 24,65,12,94 ]
};

Data types : Objects and Arrays
 Objects : Unordered key/value pairs wrapped in {}
 Arrays : Ordered key/value pairs wrapped in []
 How and when to use JSON
• Transfer data to and from a server
• Perform asynchronous data calls without requiring a page refresh
• Working with data stores
• Compile and save form or user data for local storage

Where is JSON used today?
 Anywhere and everywhere

 https://www.tutorialspoint.com/jquery/jquery-plugins.htm
 https://harvesthq.github.io/chosen/
 https://select2.github.io/
 https://select2.github.io/examples.html
 http://www.w3schools.com/js/js_json_intro.asp
References

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jQuery plugins & JSON

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