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http://jquery.com/

http://jquery.com/. What is jQuery?

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http://jquery.com/

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  1. http://jquery.com/ • What is jQuery? • jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript.

  2. jQuery library • HTML/DOM manipulation • CSS manipulation • HTML event methods • Effects and animations • AJAX • Utilities

  3. jQuery download • Production version - this is for your live website because it has been minified and compressed • Development version - this is for testing and development (uncompressed and readable code) • jQuery 1.x • http://code.jquery.com/jquery-1.11.1.js • http://code.jquery.com/jquery-1.11.1.min.js • jQuery 2.x • http://code.jquery.com/jquery-2.1.1.js • http://code.jquery.com/jquery-2.1.1.min.js

  4. jQuery install • <head><script src="jquery-1.11.1.min.js"></script></head> • GOOGLE CDN(Content Delivery Network): • <head><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script></head> • Microsoft CDN: • <head><script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.11.1.min.js"></script></head>

  5. jQuery Syntax • 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) • Examples: • $(this).hide() - hides the current element. • $("p").hide() - hides all <p> elements. • $(".test").hide() - hides all elements with class="test". • $("#test").hide() - hides the element with id="test".

  6. Document Ready Event • $(document).ready(function(){// jQuery methods go here...}); • $(function(){// jQuery methods go here...});

  7. jQuery Selectors • All selectors in jQuery start with the dollar sign and parentheses: $(). • The element Selector: $("p") • The #id Selector: $("#test") • The .class Selector: $(".test")

  8. jQuery Event Methods $("p").click(function(){  // action goes here!!});

  9. jQuery Effects - Hide and Show • $(selector).hide(speed,callback); • $("#hide").click(function(){ $("p").hide(); }); • $(selector).show(speed,callback); • $("#show").click(function(){ $("p").show(); }); • $(selector).toggle(speed,callback); $("button").click(function(){$("p").toggle();});

  10. jQuery Effects - Fading • $(selector).fadeIn(speed,callback); • $(selector).fadeOut(speed,callback); • $(selector).fadeToggle(speed,callback); • $(selector).fadeTo(speed,opacity,callback);

  11. jQuery Effects - Sliding • $(selector).slideDown(speed,callback); • $(selector).slideUp(speed,callback); • $(selector).slideToggle(speed,callback);

  12. jQuery Animations - The animate() Method • $(selector).animate({params},speed,callback); • $("button").click(function(){  $("div").animate({    left:'250px',    height:'+=150px',    width:'+=150px'  });}); • $("button").click(function(){  $("div").animate({height:'toggle'  });}); 

  13. jQuery stop() animation Method • $(selector).stop(stopAll,goToEnd); • $("#stop").click(function(){  $("#panel").stop();});

  14. <script> • $(document).ready(function(){ • $("#start").click(function(){ • $("div").animate({left:'100px'},5000); • $("div").animate({fontSize:'3em'},5000); • }); • $("#stop").click(function(){ • $("div").stop(); • }); • $("#stop2").click(function(){ • $("div").stop(true); • }); • $("#stop3").click(function(){ • $("div").stop(true,true); • }); • }); • </script>

  15. Simultaneous animations $(document).ready(function(){ $("#start").click(function(){ $("div").animate({left:'100px', fontSize:'3em'},5000); //$("div").animate({fontSize:'3em'},5000); });

  16. jQuery Callback Functions • $(selector).hide(speed,callback); • $("button").click(function(){  $("p").hide("slow",function(){    alert("The paragraph is now hidden");  });}); • $("button").click(function(){  $("p").hide(1000);  alert("The paragraph is now hidden");});

  17. jQuery Method Chaining • $("#p1").css("color","red").slideUp(2000).slideDown(2000);

  18. jQuery DOM Manipulation • text() - Sets or returns the text content of selected elements • html() - Sets or returns the content of selected elements (including HTML markup) • val() - Sets or returns the value of form fields • $("#btn1").click(function(){alert("Text: " + $("#test").text());}); • $("#btn2").click(function(){alert("HTML: " + $("#test").html());}); • $("#btn1").click(function(){alert("Value: " + $("#test").val());}); • $("button").click(function(){alert($("#w3s").attr("href"));});

  19. Set Content - text(), html() and val() • $("#btn1").click(function(){ $("#test1").text("Hello world!");}); • $("#btn2").click(function(){$("#test2").html("<b>Hello world!</b>");}); • $("#btn3").click(function(){$("#test3").val("Dolly Duck");});

  20. Callback Function for text(), html(), and val() • $("#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 + ")";   });});

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

  22. jQuery - Add Elements Add New HTML Content • 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

  23. $("p").append("Some appended text."); • $("p").prepend("Some prepended text."); • function appendText(){vartxt1="<p>Text.</p>";               // Create element with HTML  vartxt2=$("<p></p>").text("Text.");   // Create with jQueryvartxt3=document.createElement("p");  // Create with DOM txt3.innerHTML="Text."; $("p").append(txt1,txt2,txt3);         // Append the new elements } • $("img").after("Some text after");$("img").before("Some text before");

  24. jQuery - Remove Elements /Content • remove() - Removes the selected element (and its child elements) • empty() - Removes the child elements from the selected element • $("#div1").remove(); • $("#div1").empty(); • $("p").remove(".italic");

  25. jQuery Manipulating CSS • jQuery Manipulating CSS • addClass() - Adds one or more classes to the selected elements • removeClass() - Removes one or more classes from the selected elements • toggleClass() - Toggles between adding/removing classes from the selected elements • css() - Sets or returns the style attribute

  26. .important{font-weight:bold;font-size:xx-large;}.blue{color:blue;}.important{font-weight:bold;font-size:xx-large;}.blue{color:blue;} • $("button").click(function(){  $("h1,h2,p").addClass("blue");  $("div").addClass("important");});

  27. $("button").click(function(){  $("#div1").addClass("important blue");}); • $("button").click(function(){  $("h1,h2,p").removeClass("blue");}); • $("button").click(function(){  $("h1,h2,p").toggleClass("blue");});

  28. jQuery css() Method • css("propertyname"); • $("p").css("background-color"); • css("propertyname","value"); • $("p").css("background-color","yellow"); • css({"propertyname":"value","propertyname":"value",...}); • $("p").css({"background-color":"yellow","font-size":"200%"});

  29. jQuery Dimension Methods • width() • height() • innerWidth() • innerHeight() • outerWidth() • outerHeight()

  30. $("button").click(function(){var txt="";  txt+="Width: " + $("#div1").width() + "</br>";  txt+="Height: " + $("#div1").height();  $("#div1").html(txt);}); • $("button").click(function(){var txt="";  txt+="Inner width: " + $("#div1").innerWidth() + "</br>";  txt+="Inner height: " + $("#div1").innerHeight();  $("#div1").html(txt);});

  31. $("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(){  $("#div1").width(500).height(500);});

  32. jQuery Traversing

  33. Traversing Up the DOM Tree • parent() • $("span").parent().css({"color":"red","border":"2px solid red"}); • parents() • $("span").parents().css({"color":"red","border":"2px solid red"}); • $("span").parents("ul").css({"color":"red","border":"2px solid red"}); • parentsUntil() • $("span").parentsUntil("div").css({"color":"red","border":"2px solid red"});

  34. Traversing Down the DOM Tree • children() • $("div").children().css({"color":"red","border":"2px solid red"}); • $("div").children("p.1").css({"color":"red","border":"2px solid red"}); • find() • $("div").find("span").css({"color":"red","border":"2px solid red"}); • $("div").find("*").css({"color":"red","border":"2px solid red"});

  35. Traversing Sideways in The DOM Tree • siblings() • next() • nextAll() • nextUntil() • prev() • prevAll() • prevUntil()

  36. $("h2").siblings().css({"color":"red","border":"2px solid red"}); • $("h2").siblings("p").css({"color":"red","border":"2px solid red"}); • $("h2").next().css({"color":"red","border":"2px solid red"}); • $("h2").nextAll().css({"color":"red","border":"2px solid red"}); • $("h2").nextUntil("h6").css({"color":"red","border":"2px solid red"});

  37. Narrow Down The Search For Elements • jQuery first() Method • $("div p").first().css("background-color","yellow"); }); • jQuery last() Method • $("div p").last().css("background-color","yellow"); }); • jQuery eq() method • $("p").eq(1).css("background-color","yellow"); }); • jQuery filter() Method • $("p").filter(".intro").css("background-color","yellow"); }); • jQuery not() Method • $("p").not(".intro").css("background-color","yellow"); });

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