title
jQuery Tutorial #5 - Building a jQuery Tab Panel Widget

description
In this lesson, we're going to be building a jQuery Tab Panel Widget just like the ones you've undoubtedly seen all over. There's nothing special about what we're going to build, but this lesson will help you get a great understanding of how to build things in jQuery. Here's the code for this example: http://codepen.io/anon/pen/mJyQez Lesson #1: jQuery Tutorial for Beginners https://www.youtube.com/watch?v=hMxGhHNOkCU Lesson #2: Listen to user events and respond with jQuery actions! https://www.youtube.com/watch?v=G-POtu9J-m4 Lesson #3: Clean up the jQuery by putting some data in the HTML https://www.youtube.com/watch?v=Cc3K2jDdKTo Lesson #4: "DOM Traversal" with jQuery https://www.youtube.com/watch?v=LYKRkHSLE2E -~-~~-~~~-~~-~- Also watch: "Responsive Design Tutorial - Tips for making web sites look great on any device" https://www.youtube.com/watch?v=fgOO9YUFlGI -~-~~-~~~-~~-~-

detail
{'title': 'jQuery Tutorial #5 - Building a jQuery Tab Panel Widget', 'heatmap': [{'end': 63.579, 'start': 39.233, 'weight': 0.897}, {'end': 300.791, 'start': 278.387, 'weight': 0.723}, {'end': 765.353, 'start': 745.842, 'weight': 1}], 'summary': 'Learn to build a tab panel using jquery, lay out html structure, set up css rules, and handle tab switching functionality. understand javascript tab panels creation, jquery click event handling, and code optimization techniques for refactoring and improving performance.', 'chapters': [{'end': 119.015, 'segs': [{'end': 38.312, 'src': 'embed', 'start': 1.849, 'weight': 0, 'content': [{'end': 7.471, 'text': "So in this video, we're going to be building a tab panel using jQuery, similar to the ones you've seen around the internet.", 'start': 1.849, 'duration': 5.622}, {'end': 12.333, 'text': 'Basically, I want to be able to click on these different tabs and see different kinds of content.', 'start': 8.071, 'duration': 4.262}, {'end': 16.014, 'text': "So here's how you would lay that out in the HTML.", 'start': 12.893, 'duration': 3.121}, {'end': 23.437, 'text': "I've kind of got this whole thing, which is my tab panels, and then I've built a UL with an LI, and that is these panels up here,", 'start': 16.835, 'duration': 6.602}, {'end': 25.358, 'text': 'kind of like you would, a navigation on a web page.', 'start': 23.437, 'duration': 1.921}, {'end': 31.644, 'text': "And then I've got a bunch of divs here, each with an ID of panel 1, 2, 3, 4.", 'start': 26.078, 'duration': 5.566}, {'end': 34.087, 'text': "And so I've set up a couple CSS rules here.", 'start': 31.644, 'duration': 2.443}, {'end': 38.312, 'text': 'Is by default, any div with a class of panel is going to be hidden.', 'start': 34.628, 'duration': 3.684}], 'summary': 'Building a tab panel using jquery to display different content, with html layout and css rules.', 'duration': 36.463, 'max_score': 1.849, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA1849.jpg'}, {'end': 63.579, 'src': 'heatmap', 'start': 39.233, 'weight': 0.897, 'content': [{'end': 46.082, 'text': "But then if I also add a class of active, then it's going to have, it goes from display none to display block.", 'start': 39.233, 'duration': 6.849}, {'end': 50.007, 'text': "So here's my tab panels panel is display none.", 'start': 46.122, 'duration': 3.885}, {'end': 53.553, 'text': "And that tab panel's panel active is display block.", 'start': 50.731, 'duration': 2.822}, {'end': 56.915, 'text': "So the one that has active is the one that'll get seen.", 'start': 54.193, 'duration': 2.722}, {'end': 63.579, 'text': "I've kind of done the same thing for my LIs here, is whichever one has the class of active is a darker color.", 'start': 57.515, 'duration': 6.064}], 'summary': "Adding 'active' class changes display from none to block, allowing visibility.", 'duration': 24.346, 'max_score': 39.233, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA39233.jpg'}], 'start': 1.849, 'title': 'Building tab panel with jquery', 'summary': 'Demonstrates how to build a tab panel using jquery, including laying out the html structure, setting up css rules, and writing jquery to handle tab switching functionality.', 'chapters': [{'end': 119.015, 'start': 1.849, 'title': 'Building tab panel with jquery', 'summary': 'Demonstrates how to build a tab panel using jquery, including laying out the html structure, setting up css rules, and writing jquery to handle tab switching functionality.', 'duration': 117.166, 'highlights': ['The chapter demonstrates how to build a tab panel using jQuery The video focuses on building a tab panel using jQuery to create a tabbed navigation system for displaying different content.', 'Laying out the HTML structure for the tab panels and creating CSS rules The speaker explains the HTML structure for the tab panels, which includes a UL with LI elements and divs with unique IDs, along with CSS rules to control the visibility and styling of the panels and tabs.', "Writing jQuery to handle tab switching functionality The chapter covers writing jQuery code to handle tab switching functionality, including adding and removing the 'active' class to show and hide the correct panels when a tab is clicked."]}], 'duration': 117.166, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA1849.jpg', 'highlights': ['The chapter demonstrates how to build a tab panel using jQuery The video focuses on building a tab panel using jQuery to create a tabbed navigation system for displaying different content.', "Writing jQuery to handle tab switching functionality The chapter covers writing jQuery code to handle tab switching functionality, including adding and removing the 'active' class to show and hide the correct panels when a tab is clicked.", 'Laying out the HTML structure for the tab panels and creating CSS rules The speaker explains the HTML structure for the tab panels, which includes a UL with LI elements and divs with unique IDs, along with CSS rules to control the visibility and styling of the panels and tabs.']}, {'end': 594.879, 'segs': [{'end': 191.822, 'src': 'embed', 'start': 156.741, 'weight': 0, 'content': [{'end': 161.383, 'text': 'And these can happen probably in a couple different orders.', 'start': 156.741, 'duration': 4.642}, {'end': 162.863, 'text': 'Show new panel.', 'start': 161.943, 'duration': 0.92}, {'end': 165.017, 'text': "So that's kind of what I need to do here.", 'start': 163.556, 'duration': 1.461}, {'end': 166.338, 'text': "Let's figure out how to do this.", 'start': 165.057, 'duration': 1.281}, {'end': 172.904, 'text': "I need to figure out by clicking on an LI, I need to know which div I'm going to show.", 'start': 166.499, 'duration': 6.405}, {'end': 176.527, 'text': "So I'm going to add a rel here equals panel 1.", 'start': 172.964, 'duration': 3.563}, {'end': 182.772, 'text': "So that way I know that to look for ID panel 1, and we'll get that guy.", 'start': 176.527, 'duration': 6.245}, {'end': 188.64, 'text': 'rel equals panel 2.', 'start': 184.233, 'duration': 4.407}, {'end': 191.822, 'text': 'rel equals..', 'start': 188.64, 'duration': 3.182}], 'summary': 'Determining the order for showing new panels by clicking on an li, with specific references to panel 1 and panel 2.', 'duration': 35.081, 'max_score': 156.741, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA156741.jpg'}, {'end': 313.728, 'src': 'heatmap', 'start': 278.387, 'weight': 1, 'content': [{'end': 281.368, 'text': 'Panel.active, just like I would in CSS.', 'start': 278.387, 'duration': 2.981}, {'end': 285.989, 'text': "Hide I'll actually make it slide up 300.", 'start': 282.468, 'duration': 3.521}, {'end': 288.549, 'text': 'So there we go.', 'start': 285.989, 'duration': 2.56}, {'end': 291.61, 'text': 'So now whenever I click, yep, the existing one slides up.', 'start': 288.589, 'duration': 3.021}, {'end': 293.99, 'text': 'So no matter which button I click, the existing one slides up.', 'start': 291.65, 'duration': 2.34}, {'end': 295.39, 'text': "Great That's a good start.", 'start': 294.39, 'duration': 1}, {'end': 300.791, 'text': 'And I also, I accidentally removed my class equals active from my first one.', 'start': 296.151, 'duration': 4.64}, {'end': 301.772, 'text': 'There you go.', 'start': 301.432, 'duration': 0.34}, {'end': 303.432, 'text': 'We want to make sure we start off on panel one.', 'start': 301.932, 'duration': 1.5}, {'end': 306.085, 'text': 'So that first one is done.', 'start': 304.244, 'duration': 1.841}, {'end': 313.728, 'text': "Great Now I need to show the new panel, but I only want to show it after this one's done sliding up so I can add a function.", 'start': 306.205, 'duration': 7.523}], 'summary': 'Sliding panel up by 300 on click, ensuring start on panel one.', 'duration': 53.495, 'max_score': 278.387, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA278387.jpg'}, {'end': 472.646, 'src': 'embed', 'start': 432.669, 'weight': 3, 'content': [{'end': 436.051, 'text': "The LI got clicked, so we're running all the code within that function.", 'start': 432.669, 'duration': 3.382}, {'end': 440.794, 'text': 'Anywhere in this code, this refers to the LI that got clicked.', 'start': 436.391, 'duration': 4.403}, {'end': 447.197, 'text': "So now we're going to run, we're going to find the active panel and slide it up.", 'start': 441.634, 'duration': 5.563}, {'end': 449.899, 'text': 'And we have a callback function for the slide up.', 'start': 447.818, 'duration': 2.081}, {'end': 460.065, 'text': 'So anywhere inside of this function, if I were to do this right now, this would be the panel active that we selected, if that makes sense.', 'start': 450.539, 'duration': 9.526}, {'end': 464.2, 'text': 'So this would no longer refer to the LI tab.', 'start': 460.777, 'duration': 3.423}, {'end': 468.023, 'text': "So that's one thing that people very quickly get confused on in jQuery.", 'start': 464.66, 'duration': 3.363}, {'end': 472.646, 'text': "You have to know where you are because this will change based off of what's going on.", 'start': 468.343, 'duration': 4.303}], 'summary': 'Code within li click function runs active panel slide up with callback.', 'duration': 39.977, 'max_score': 432.669, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA432669.jpg'}, {'end': 552.314, 'src': 'embed', 'start': 520.523, 'weight': 5, 'content': [{'end': 521.024, 'text': "We're finished.", 'start': 520.523, 'duration': 0.501}, {'end': 523.804, 'text': "So here's kind of how we had to do it.", 'start': 521.484, 'duration': 2.32}, {'end': 525.545, 'text': 'We had to figure out which panel to show.', 'start': 524.083, 'duration': 1.462}, {'end': 526.885, 'text': "That's the easy part.", 'start': 526.005, 'duration': 0.88}, {'end': 531.086, 'text': 'And then we have to slide this one up.', 'start': 528.045, 'duration': 3.041}, {'end': 534.327, 'text': "And as soon as it slid up, we're going to remove the class of active.", 'start': 531.586, 'duration': 2.741}, {'end': 539.308, 'text': "This is pointing to this, the active panel that we've selected.", 'start': 534.967, 'duration': 4.341}, {'end': 544.21, 'text': "And then once we've removed our active class, we're going to slide down our new one.", 'start': 540.228, 'duration': 3.982}, {'end': 549.413, 'text': "And once it's all the way done, then we're going to fire this function and add the class of active to it.", 'start': 544.51, 'duration': 4.903}, {'end': 552.314, 'text': 'So this goes up, active class is gone.', 'start': 550.073, 'duration': 2.241}], 'summary': 'Describes the process of sliding panels and managing the active class.', 'duration': 31.791, 'max_score': 520.523, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA520523.jpg'}, {'end': 594.879, 'src': 'embed', 'start': 569.522, 'weight': 6, 'content': [{'end': 578.288, 'text': "So now this gets the active class and we also want to find the LI that has the active class and we're going to want to remove that first.", 'start': 569.522, 'duration': 8.766}, {'end': 583.411, 'text': 'There we go.', 'start': 583.011, 'duration': 0.4}, {'end': 591.316, 'text': "So, whenever we click on the LI, the first thing we do is we find the one that's active, remove that class and then add that class to me,", 'start': 583.551, 'duration': 7.765}, {'end': 592.957, 'text': 'and then go and do the rest of our panel.', 'start': 591.316, 'duration': 1.641}, {'end': 593.838, 'text': "Let's see what we got.", 'start': 593.017, 'duration': 0.821}, {'end': 594.879, 'text': 'There we go.', 'start': 594.398, 'duration': 0.481}], 'summary': 'Code removes and adds active class when clicking on li.', 'duration': 25.357, 'max_score': 569.522, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA569522.jpg'}], 'start': 120.056, 'title': 'Javascript tab panels and jquery click event handling', 'summary': "Covers the creation of tab panels in javascript, detailing the process and techniques, and also explains jquery click event handling, emphasizing the usage of 'this' and the manipulation of 'active' class.", 'chapters': [{'end': 431.797, 'start': 120.056, 'title': 'Creating tab panels in javascript', 'summary': 'Discusses the process of creating tab panels in javascript, including finding the panel to show, hiding the current panel, and showing the new panel with the use of callback functions and html attributes.', 'duration': 311.741, 'highlights': ["The process of finding the panel to show involves using HTML attributes like 'rel' to identify the panel to display, enabling the identification of the panel to be shown by clicking on an LI. The speaker explains the use of HTML attributes like 'rel' to identify the panel to display when clicking on an LI, facilitating the process of finding the panel to show.", 'The method of hiding the current panel involves using jQuery to find the active panel and making it slide up, ensuring that regardless of the button clicked, the existing panel slides up. The process of hiding the current panel is described, involving the use of jQuery to find the active panel and make it slide up, ensuring that regardless of the button clicked, the existing panel slides up.', 'The technique of showing the new panel includes adding a function as a callback to wait for the previous panel to finish sliding up before displaying the new panel, demonstrating the use of a callback function in jQuery. The speaker explains the technique of showing the new panel by adding a function as a callback to wait for the previous panel to finish sliding up before displaying the new panel, demonstrating the use of a callback function in jQuery.']}, {'end': 594.879, 'start': 432.669, 'title': 'Jquery click event handling', 'summary': "Explains the handling of click events in jquery, focusing on the usage of 'this' to refer to specific elements and the importance of removing and adding the 'active' class while manipulating panels and tabs.", 'duration': 162.21, 'highlights': ["The importance of understanding the usage of 'this' in jQuery, as it changes based on the context, causing confusion for many users.", 'The process of finding the active panel, sliding it up, and adding a callback function for the slide up action.', 'The significance of removing the active class from the panel that is being slid up, and then adding the active class to the new panel being slid down.', 'The necessity of finding the LI with the active class, removing it, and then adding the active class to the new LI when handling click events.']}], 'duration': 474.823, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA120056.jpg', 'highlights': ["The process of finding the panel to show involves using HTML attributes like 'rel' to identify the panel to display, enabling the identification of the panel to be shown by clicking on an LI.", 'The technique of showing the new panel includes adding a function as a callback to wait for the previous panel to finish sliding up before displaying the new panel, demonstrating the use of a callback function in jQuery.', 'The method of hiding the current panel involves using jQuery to find the active panel and making it slide up, ensuring that regardless of the button clicked, the existing panel slides up.', "The importance of understanding the usage of 'this' in jQuery, as it changes based on the context, causing confusion for many users.", 'The process of finding the active panel, sliding it up, and adding a callback function for the slide up action.', 'The significance of removing the active class from the panel that is being slid up, and then adding the active class to the new panel being slid down.', 'The necessity of finding the LI with the active class, removing it, and then adding the active class to the new LI when handling click events.']}, {'end': 1026.127, 'segs': [{'end': 687.39, 'src': 'embed', 'start': 641.885, 'weight': 0, 'content': [{'end': 648.151, 'text': "so instead of a callback, a written out callback here, I'm just going to go show next panel.", 'start': 641.885, 'duration': 6.266}, {'end': 649.952, 'text': "so now it's a little cleaner looking.", 'start': 648.151, 'duration': 1.801}, {'end': 657.365, 'text': "so now I'm going to hide current panel but And then I'm going to show the next panel.", 'start': 649.952, 'duration': 7.413}, {'end': 658.645, 'text': "That's a lot cleaner.", 'start': 657.725, 'duration': 0.92}, {'end': 662.186, 'text': "So now we only have one level of callbacks going on that we're visibly seeing.", 'start': 658.665, 'duration': 3.521}, {'end': 664.467, 'text': "And you know what? I'm going to leave that there.", 'start': 662.787, 'duration': 1.68}, {'end': 669.249, 'text': "I don't think this is detailed enough for me to have to pull this function out into its own function.", 'start': 664.567, 'duration': 4.682}, {'end': 670.889, 'text': "So I'm going to leave that there.", 'start': 669.809, 'duration': 1.08}, {'end': 673.15, 'text': "Let's verify everything works just as it should.", 'start': 671.01, 'duration': 2.14}, {'end': 675.231, 'text': 'Everything still looks great.', 'start': 673.751, 'duration': 1.48}, {'end': 681.193, 'text': 'Okay One more problem here is we are referencing on click.', 'start': 675.731, 'duration': 5.462}, {'end': 683.054, 'text': "We're doing this search right here.", 'start': 681.293, 'duration': 1.761}, {'end': 685.849, 'text': "and we're doing this search right here.", 'start': 684.229, 'duration': 1.62}, {'end': 687.39, 'text': 'This is bad for two reasons.', 'start': 686.009, 'duration': 1.381}], 'summary': 'Refactoring code to reduce callback levels, verifying functionality, and addressing problematic code.', 'duration': 45.505, 'max_score': 641.885, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA641885.jpg'}, {'end': 780.801, 'src': 'heatmap', 'start': 745.842, 'weight': 3, 'content': [{'end': 751.027, 'text': "so you notice, this will now look like it's turned off and this will now go away.", 'start': 745.842, 'duration': 5.185}, {'end': 753.089, 'text': "okay, that's not okay.", 'start': 751.027, 'duration': 2.062}, {'end': 756.131, 'text': 'so what we need to do is in order to scale this.', 'start': 753.089, 'duration': 3.042}, {'end': 757.112, 'text': "it's called scaling.", 'start': 756.131, 'duration': 0.981}, {'end': 765.353, 'text': 'when something has to move beyond its initial intention into more reusable intention, we actually have to make it smarter.', 'start': 757.112, 'duration': 8.241}, {'end': 772.417, 'text': 'we have to have it only operate within the panel that was clicked on, within the tab panel that was clicked.', 'start': 765.353, 'duration': 7.064}, {'end': 776.159, 'text': "so here's what we're going to do.", 'start': 772.417, 'duration': 3.742}, {'end': 780.801, 'text': "we're actually going to go, and let's go ahead.", 'start': 776.159, 'duration': 4.642}], 'summary': 'Need to scale the operation for more reusability and make it smarter.', 'duration': 27.712, 'max_score': 745.842, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA745842.jpg'}, {'end': 904.815, 'src': 'embed', 'start': 879.189, 'weight': 4, 'content': [{'end': 886.912, 'text': "one thing that's a good rule to do is whenever a variable is referencing a jQuery selector,", 'start': 879.189, 'duration': 7.723}, {'end': 890.293, 'text': "which is what we're doing here it's a good idea to put $ in front of it.", 'start': 886.912, 'duration': 3.381}, {'end': 894.292, 'text': 'That way you kind of know this thing represents a jQuery selector.', 'start': 890.831, 'duration': 3.461}, {'end': 897.073, 'text': "It's not just any old variable.", 'start': 895.492, 'duration': 1.581}, {'end': 899.554, 'text': "So that's how we did it.", 'start': 897.333, 'duration': 2.221}, {'end': 901.054, 'text': 'Hopefully that made sense to you.', 'start': 899.754, 'duration': 1.3}, {'end': 904.815, 'text': 'I tried not to go into too much detail and I tried to not avoid detail.', 'start': 901.154, 'duration': 3.661}], 'summary': 'Use $ in front of variables referencing jquery selectors for clarity and specificity.', 'duration': 25.626, 'max_score': 879.189, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA879189.jpg'}], 'start': 595.279, 'title': 'Code optimization techniques', 'summary': 'Discusses refactoring callback functions to reduce callback levels and improve code structure. it also explains the optimization of a jquery tab panel by addressing performance issues and enhancing code scalability and efficiency.', 'chapters': [{'end': 664.467, 'start': 595.279, 'title': 'Refactoring callback functions', 'summary': "Discusses the issue of 'callback hell' when callbacks extend beyond one or two levels and presents a solution by refactoring the code to reduce the callback levels, resulting in a cleaner and more manageable code structure.", 'duration': 69.188, 'highlights': ["The term 'callback hell' is used to describe the situation when callbacks extend beyond one or two levels, causing code complexity.", "Refactoring the code by defining a function named 'show next panel' and using it to replace the written out callbacks reduces the callback levels, resulting in a cleaner and more manageable code structure.", 'The refactored code now has only one level of visible callbacks, making it easier to understand and maintain.']}, {'end': 1026.127, 'start': 664.567, 'title': 'Jquery tab panel optimization', 'summary': 'Explains the optimization of a jquery tab panel by identifying and addressing performance issues, such as excessive dom searches and inefficient event handling, and provides a step-by-step guide for enhancing the scalability and efficiency of the code.', 'duration': 361.56, 'highlights': ['The chapter highlights the performance issues with excessive DOM searches and inefficient event handling in the jQuery tab panel code, emphasizing the negative impact on application speed and functionality. The excessive DOM searches and inefficient event handling in the code can slow down the application and cause problems, as it involves searching the entire web page for elements, impacting both speed and functionality.', 'The chapter provides a step-by-step guide for optimizing the code by making it more scalable and efficient, including techniques such as limiting searches to specific elements and improving event handling. The guide includes techniques to ensure that the code operates only within the specific tab panel that was clicked, thereby improving scalability and efficiency, such as limiting searches to specific elements and improving event handling.', 'The chapter emphasizes the importance of using $ as a prefix for variables referencing jQuery selectors to distinguish them from regular variables, providing clarity and improving code readability. Using $ as a prefix for variables referencing jQuery selectors is highlighted as a good practice to improve code readability and clarity, distinguishing them from regular variables.']}], 'duration': 430.848, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/1nWrIBB_bMA/pics/1nWrIBB_bMA595279.jpg', 'highlights': ["Refactoring the code by defining a function named 'show next panel' and using it to replace the written out callbacks reduces the callback levels, resulting in a cleaner and more manageable code structure.", 'The refactored code now has only one level of visible callbacks, making it easier to understand and maintain.', 'The chapter provides a step-by-step guide for optimizing the code by making it more scalable and efficient, including techniques such as limiting searches to specific elements and improving event handling.', 'The guide includes techniques to ensure that the code operates only within the specific tab panel that was clicked, thereby improving scalability and efficiency, such as limiting searches to specific elements and improving event handling.', 'Using $ as a prefix for variables referencing jQuery selectors is highlighted as a good practice to improve code readability and clarity, distinguishing them from regular variables.']}], 'highlights': ["Refactoring the code by defining a function named 'show next panel' and using it to replace the written out callbacks reduces the callback levels, resulting in a cleaner and more manageable code structure.", 'The refactored code now has only one level of visible callbacks, making it easier to understand and maintain.', 'The chapter provides a step-by-step guide for optimizing the code by making it more scalable and efficient, including techniques such as limiting searches to specific elements and improving event handling.', 'Using $ as a prefix for variables referencing jQuery selectors is highlighted as a good practice to improve code readability and clarity, distinguishing them from regular variables.', "The process of finding the panel to show involves using HTML attributes like 'rel' to identify the panel to display, enabling the identification of the panel to be shown by clicking on an LI.", 'The technique of showing the new panel includes adding a function as a callback to wait for the previous panel to finish sliding up before displaying the new panel, demonstrating the use of a callback function in jQuery.', 'The method of hiding the current panel involves using jQuery to find the active panel and making it slide up, ensuring that regardless of the button clicked, the existing panel slides up.', "The importance of understanding the usage of 'this' in jQuery, as it changes based on the context, causing confusion for many users.", 'The process of finding the active panel, sliding it up, and adding a callback function for the slide up action.', 'The significance of removing the active class from the panel that is being slid up, and then adding the active class to the new panel being slid down.', 'The necessity of finding the LI with the active class, removing it, and then adding the active class to the new LI when handling click events.', 'The chapter demonstrates how to build a tab panel using jQuery The video focuses on building a tab panel using jQuery to create a tabbed navigation system for displaying different content.', "Writing jQuery to handle tab switching functionality The chapter covers writing jQuery code to handle tab switching functionality, including adding and removing the 'active' class to show and hide the correct panels when a tab is clicked.", 'Laying out the HTML structure for the tab panels and creating CSS rules The speaker explains the HTML structure for the tab panels, which includes a UL with LI elements and divs with unique IDs, along with CSS rules to control the visibility and styling of the panels and tabs.']}