Basic Introduction of jQuery

1. JQuery iFour Consultancy https://www.ifourtechnolab.com/

2. Introduction to JQuery • JavaScript Library • Greatly simplifies JavaScript programming • It is a lightweight, "write less, do more", JavaScript library • Simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development • The purpose is to make it much easier to use JavaScript on your website https://www.ifourtechnolab.com/

3. Advantages of jQuery • There are lots of other JavaScript frameworks out there, but jQuery seems to be the most popular, and also the most extendable • Many of the biggest companies on the Web use jQuery, such as: • Google • Microsoft • IBM • Netflix https://www.ifourtechnolab.com/

4. How to Install • There are several ways to start using jQuery on your website • Download the jQuery library from jQuery.com • Include jQuery from a CDN, like Google • There are two versions of jQuery available for downloading: • Production version • Development version • If you don't want to download and host jQuery yourself, you can include it from a CDN (Content Delivery Network) • Both Google and Microsoft host jQuery https://www.ifourtechnolab.com/

5. jQuery Syntax • It is tailor made for selecting HTML elements and performing some action on the element(s) • Basic syntax is: $(selector).action() • A $ sign to define/access jQuery • A (selector) to "query (or find)" HTML elements • A jQuery action() to be performed on the element(s) • The Document Ready event is used to prevent any jQuery code from running before the document is finished loading (is ready) • It is good practice to wait for the document to be fully loaded and ready before working with it https://www.ifourtechnolab.com/

6. Enable jQuery in your page • jQuery can be enabled in your page by including reference to jQuery library file<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"> • Introduce a jQuery function by using the below given function$(document).ready(function(){//Script goes here});OR$(function(){//Script goes here}); https://www.ifourtechnolab.com/

7. JavaScript vs jQuery • Example 1 - Hide an element with id "textbox“//JavaScriptdocument.getElementById('textbox').style.display = "none";//jQuery$(' #textbox' ).hide(); • Example 2 - Create a <h1> tag with "my text“//JavaScriptvar h1 = document.CreateElement("h1"); h1.innerHTML = "my text"; document.getElementsByTagName('body')[0].appendChild(h1); • //jQuery$(' body').append( $("<h1/>").html("my text") ; https://www.ifourtechnolab.com/

8. jQuery Selectors • One of the most important parts of the jQuery library • Allow you to select and manipulate HTML element(s) • Used to "find" (or select) HTML elements based on their id, classes, types, attributes, values of attributes and much more • Selects elements based on the element name • The jQuery #id selector uses the id attribute of an HTML tag to find the specific element. • The jQuery class selector finds elements with a specific class https://www.ifourtechnolab.com/

9. Positional Selectors Syntax: Examples:$("selector:first") $("p:first") $("selector:last") $("p:last") $("selector:odd") $("p:odd") $("selector:even") $("p:even") $("selector:eq(i)") $("p:eq(1)") $("selector:gt(i)") $("p:gt(1)") $("selector:lt(i)") $("p:lt(1)") https://www.ifourtechnolab.com/

10. Basic selectors • Tag Namedocument.getElementsByTagName("tagName"); (JavaScript)$("tagName") - $("div"), $("p"), $("div") • Tag IDdocument.getElementById("id"); (JavaScript)$("#id") - $("#name"), $("#address") • Tag Classdocument.getElementsByClassName("className"); (JavaScript)$(".className") - $(".comment"), $(".code") • To select all elements - $("*") https://www.ifourtechnolab.com/

11. Form Element(Custom) Selectors $("selector:visible") $("selector:input") $("selector:hidden") $("selector:text")$("selector:disabled") $("selector:password") $("selector:enabled") $("selector:radio")$("selector:checked") $("selector:checkbox") $("selector:selected") $("selector:submit")$("selector:header") $("selector:reset") $("selector:animated") $("selector:image")$("selector:not(selector:not)") $("selector:file") $("selector:button") https://www.ifourtechnolab.com/

12. Retrieve, Set and Remove attribute Syntax: Examples: $("selector").attr("name") $("img").attr("src") $("selector").attr("key","val") $("p").attr("class","source") $("selector").attr("key",fn()) $("img").attr("height",calHt()) $("selector").attr(properties) $("img").attr({"src":"/path/","title" : "My Img"}); $("selector").removeAttr(attr) $("div").removeAttr("class“) https://www.ifourtechnolab.com/

13. Class, HTML, Text, Value - Functions $("selector").hasClass("className") $("selector").addClass("className") $("selector").removeClass("className") $("selector").toggleClass("className") $("selector").html() $("selector").html("html code") $("selector").text() $("selector").text("text content") $("selector").val() $("selector").val("value") https://www.ifourtechnolab.com/

14. Events • All the different visitor's actions that a web page can respond to are called events • Represents the precise moment when something happens • Examples: • moving a mouse over an element • selecting a radio button • clicking on an element • The term "fires/fired" is often used with events. Example: "The keypress event is fired, the moment you press a key" https://www.ifourtechnolab.com/

15. Commonly Used jQuery Event Methods • click() • This method attaches an event handler function to an HTML element • The function is executed when the user clicks on the HTML element • The following example says: When a click event fires on a <p> element; hide the current <p> element: • Example: • $("p").click(function(){$(this).hide(); }); https://www.ifourtechnolab.com/

16. Commonly Used jQuery Event Methods • dblclick() • This method attaches an event handler function to an HTML element • The function is executed when the user double-clicks on the HTML element: • Example: • $("p").dblclick(function(){ • $(this).hide();}); https://www.ifourtechnolab.com/

17. Commonly Used jQuery Event Methods • mouseenter() • This method attaches an event handler function to an HTML element • The function is executed when the mouse pointer enters the HTML element: • Example: • $("#p1").mouseenter(function(){ • alert("You entered p1!");}); https://www.ifourtechnolab.com/

18. Commonly Used jQuery Event Methods • mouseleave() • This method attaches an event handler function to an HTML element • The function is executed when the mouse pointer leaves the HTML element: • Example: • $("#p1").mouseleave(function(){ • alert("Bye! You now leave p1!");}); https://www.ifourtechnolab.com/

19. Commonly Used jQuery Event Methods • mousedown() • This method attaches an event handler function to an HTML element • The function is executed, when the left, middle or right mouse button is pressed down, while the mouse is over the HTML element: • Example: • $("#p1").mousedown(function(){ • alert("Mouse down over p1!");}); https://www.ifourtechnolab.com/

20. Commonly Used jQuery Event Methods • mouseup() • Thismethod attaches an event handler function to an HTML element • The function is executed, when the left, middle or right mouse button is released, while the mouse is over the HTML element: • Example: • $("#p1").mouseup(function(){ • alert("Mouse up over p1!");}); https://www.ifourtechnolab.com/

21. Commonly Used jQuery Event Methods • hover() • This method takes two functions and is a combination of the mouseenter()and mouseleave()methods • The first function is executed when the mouse enters the HTML element, and the second function is executed when the mouse leaves the HTML element: • Example: • $("#p1").hover(function(){ • alert("You hover p1!");}) ,function(){    alert("Bye! You now leave p1!");}); https://www.ifourtechnolab.com/

22. Commonly Used jQuery Event Methods • focus() • Thismethod attaches an event handler function to an HTML form field • The function is executed when the form field gets focus: • Example: • $("input").focus(function(){ • $(this).css("background-color", "#cccccc");}); https://www.ifourtechnolab.com/

23. Commonly Used jQuery Event Methods • blur() • Thismethod attaches an event handler function to an HTML form field • The function is executed when the form field loses focus: • Example: • $("input").blur(function(){ • $(this).css("background-color", "#ffffff");}); https://www.ifourtechnolab.com/

24. Useful Event Functions • .hide() display:true • .show() display:none • .toggle(func1, func2) first click calls func1, next click executes func2 • .hover(over, out) mouseover, mouseout https://www.ifourtechnolab.com/

25. Effects • show() Shows the selected elements • Hide() Hides the selected elements • fadeIn() Fades in the selected elements • fadeOut() Fades out the selected elements • fadeToggle() Toggles between the fadeIn() and fadeOut() methods • slideUp() Slides-up (hides) the selected elements https://www.ifourtechnolab.com/

26. Effects • slideDown() Slides-down (shows) the selected elements • Finish() Stops, removes and completes all queued animations for the selected elements • Delay() Sets a delay for all queued functions on the selected elements • Animate() Runs a custom animation on the selected elements • Stop() Stops the currently running animation for the selected elements • Dequeue() Removes the next function from the queue, and then executes the function https://www.ifourtechnolab.com/

27. jQuery UI • Collection of GUI widgets, animated visual effects, and themes implemented with jQuery (a JavaScript library), Cascading Style Sheets, and HTML. Whether you're building highly interactive web applications or you just need to add a date picker to a form control, jQuery UI is the perfect choice. • Features • Interactions • Widgets • Effects https://www.ifourtechnolab.com/

28. jQuery UI : Interactions • Draggable : Allow elements to be moved using the mouse • Droppable : Create targets for draggable elements • Resizable : Change the size of an element using the mouse • Selectable : Use the mouse to select elements, individually or in a group • Sortable : Reorder elements in a list or grid using the mouse https://www.ifourtechnolab.com/

29. jQuery UI : Interactions - Example (Draggable, Resizable) https://www.ifourtechnolab.com/

30. jQuery UI : Widgets • Accordion : Displays collapsible content panels for presenting information in a limited amount of space • Autocomplete: Enables users to quickly find and select from a pre-populated list of values as they type, leveraging searching and filtering • Button : Enhances standard form elements like buttons, inputs and anchors to themeable buttons with appropriate hover and active styles • Checkboxradio : Enhances standard checkbox and radio input element to themeable buttons with appropriate hover and active styles • ControlGroup : Groups multiple buttons and other widgets into one visual set • Datepicker : Select a date from a popup or inline calendar https://www.ifourtechnolab.com/

31. jQuery UI : Widgets • Dialog : Open content in an interactive overlay • Menu : Themeable menu with mouse and keyboard interactions for navigation • Progressbar : Display status of a determinate or indeterminate process • SelectMenu : Duplicates and extends the functionality of a native HTML select element to overcome the limitations of the native control • Slider : Drag a handle to select a numeric value • Spinner : Enhance a text input for entering numeric values, with up/down buttons and arrow key handling • Tabs : A single content area with multiple panels, each associated with a header in a list • Tooltip : Customizable, themeable tooltips, replacing native tooltips https://www.ifourtechnolab.com/

32. jQuery UI : Widgets - Examples • Accordion https://www.ifourtechnolab.com/

33. jQuery UI : Widgets - Examples • Autocomplete https://www.ifourtechnolab.com/

34. jQuery UI : Widgets - Examples • Datepicker https://www.ifourtechnolab.com/

35. jQuery UI : Effects • Add Class : Adds class(es) to elements while animating all style changes • Color Animation : Animate the properties of elements between colors • Easing : Apply an easing equation to an animation • Effect : Apply an animation effect to an element • Hide : Hide elements using custom effects • Remove Class : Removes class(es) from elements while animating all style changes • Show : Display elements using custom effects • Switch Class : Add and remove class(es) to elements while animating all style changes • Toggle : Display or hide elements using custom effects • Toggle Class : Toggle class(es) on elements while animating all style changes https://www.ifourtechnolab.com/

36. jQuery UI : Effects - Examples • Add Class and Remove Class https://www.ifourtechnolab.com/

37. Thank You!! https://www.ifourtechnolab.com/