title
jQuery Tutorial #6 - Building a jQuery Image Slider

description
In this jQuery Tutorial, we're going to be building a jQuery Image Slider Widget. There are lots of great jQuery slider plugins out there that have way more features and real-world testing, but this lesson on building one will help you understand jQuery programming a lot. We'll also introduce the concept of "DOM caching" - searching the DOM as little as we possibly can and then saving the results for quick-access later. Let's get into this jQuery Tutorial View the source code here: http://jsfiddle.net/EjZzs/15/ 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 Lesson #5: Building a jQuery Tab Panel Widget https://www.youtube.com/watch?v=1nWrIBB_bMA -~-~~-~~~-~~-~- 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 #6 - Building a jQuery Image Slider', 'heatmap': [{'end': 91.615, 'start': 28.129, 'weight': 0.746}, {'end': 604.002, 'start': 572.814, 'weight': 0.748}], 'summary': 'Learn to build a basic jquery image slider using a wrapper div, ul, and lis, and leverage css for layout and javascript for slide navigation. understand javascript setinterval for regular function execution, jquery animation of css properties, building a slider with jquery, intervals, margin left animation, mouse enter and pause events, and configuration options. also, discover the benefits of caching the dom for faster operations and high-performance code, and create a jquery slider with animation, callbacks, and user interaction features for smooth transitions.', 'chapters': [{'end': 110.431, 'segs': [{'end': 91.615, 'src': 'heatmap', 'start': 28.129, 'weight': 0.746, 'content': [{'end': 30.969, 'text': 'And then I have a bunch of LIs that all have a class of slide.', 'start': 28.129, 'duration': 2.84}, {'end': 34.87, 'text': "Each one of these has just an image that I've put in there.", 'start': 31.809, 'duration': 3.061}, {'end': 37.43, 'text': 'Slider 1, 2, 3, 4, 5.', 'start': 35.05, 'duration': 2.38}, {'end': 39.831, 'text': 'And then I finished it with my first one as well.', 'start': 37.431, 'duration': 2.4}, {'end': 41.572, 'text': "They're going to be sliding to the left.", 'start': 39.951, 'duration': 1.621}, {'end': 45.793, 'text': 'And I want the first one to be able to slide onto the screen at the very end.', 'start': 42.112, 'duration': 3.681}, {'end': 47.133, 'text': "We'll see what that means in a minute.", 'start': 45.973, 'duration': 1.16}, {'end': 49.815, 'text': "So here's the CSS driving it.", 'start': 48.334, 'duration': 1.481}, {'end': 54.557, 'text': 'The slider wrapper has a width of 720 and any overflow is hidden.', 'start': 50.395, 'duration': 4.162}, {'end': 58.018, 'text': 'And then all the slides are going left to right all the way out.', 'start': 55.017, 'duration': 3.001}, {'end': 65.041, 'text': 'So the slides UL has a width of 6,000 pixels and then all the slides float left.', 'start': 58.098, 'duration': 6.943}, {'end': 76.006, 'text': "So basically what you're seeing here is I can show you is if I were to make the margin left, negative 100 pixels, there you go.", 'start': 65.221, 'duration': 10.785}, {'end': 85.77, 'text': "So as the UL slides to the left with a negative margin, it's going to move there until we run out of slides.", 'start': 76.522, 'duration': 9.248}, {'end': 91.615, 'text': 'And so basically all our JavaScript needs to do is move this UL back and forth.', 'start': 86.09, 'duration': 5.525}], 'summary': 'Creating a slider with 5 images, ul width of 6000px, sliding left to right.', 'duration': 63.486, 'max_score': 28.129, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o28129.jpg'}, {'end': 76.006, 'src': 'embed', 'start': 42.112, 'weight': 0, 'content': [{'end': 45.793, 'text': 'And I want the first one to be able to slide onto the screen at the very end.', 'start': 42.112, 'duration': 3.681}, {'end': 47.133, 'text': "We'll see what that means in a minute.", 'start': 45.973, 'duration': 1.16}, {'end': 49.815, 'text': "So here's the CSS driving it.", 'start': 48.334, 'duration': 1.481}, {'end': 54.557, 'text': 'The slider wrapper has a width of 720 and any overflow is hidden.', 'start': 50.395, 'duration': 4.162}, {'end': 58.018, 'text': 'And then all the slides are going left to right all the way out.', 'start': 55.017, 'duration': 3.001}, {'end': 65.041, 'text': 'So the slides UL has a width of 6,000 pixels and then all the slides float left.', 'start': 58.098, 'duration': 6.943}, {'end': 76.006, 'text': "So basically what you're seeing here is I can show you is if I were to make the margin left, negative 100 pixels, there you go.", 'start': 65.221, 'duration': 10.785}], 'summary': 'Css-driven slider with 720px wrapper, 6,000px slides ul, and -100px margin left.', 'duration': 33.894, 'max_score': 42.112, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o42112.jpg'}, {'end': 126.264, 'src': 'embed', 'start': 93.877, 'weight': 2, 'content': [{'end': 96.299, 'text': 'Oh yeah, and then when it gets to the end here, let me go back up here.', 'start': 93.877, 'duration': 2.422}, {'end': 103.226, 'text': 'When it gets to the end, we need to somehow know that we are on the last slide, and then boom, go to margin zero.', 'start': 97.102, 'duration': 6.124}, {'end': 106.709, 'text': "And the user won't even notice it because it's the exact same slide.", 'start': 104.067, 'duration': 2.642}, {'end': 109.331, 'text': 'So we need to go back to margin zero when we hit the last slide.', 'start': 107.049, 'duration': 2.282}, {'end': 110.431, 'text': "So let's get into the code.", 'start': 109.551, 'duration': 0.88}, {'end': 117.276, 'text': "One piece of code you'll need to know in JavaScript that if you don't know how to do it yet is setInterval.", 'start': 111.992, 'duration': 5.284}, {'end': 120.058, 'text': 'setInterval takes two things.', 'start': 118.497, 'duration': 1.561}, {'end': 126.264, 'text': "It takes a function and then it takes a time frame like, let's say, a thousand milliseconds, which is one second,", 'start': 120.118, 'duration': 6.146}], 'summary': 'Javascript code uses setinterval to handle slide transitions.', 'duration': 32.387, 'max_score': 93.877, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o93877.jpg'}], 'start': 1.286, 'title': 'Building a basic jquery image slider', 'summary': 'Covers the process of constructing a basic jquery image slider using a wrapper div, ul, and lis for the slides, and leveraging css for layout and javascript for slide navigation.', 'chapters': [{'end': 110.431, 'start': 1.286, 'title': 'Building a basic jquery image slider', 'summary': 'Covers building a basic jquery image slider with a wrapper div, ul, and lis for the slides, utilizing css for layout and javascript for moving the slides back and forth.', 'duration': 109.145, 'highlights': ['The slides UL has a width of 6,000 pixels and then all the slides float left. The UL for the slides has a width of 6,000 pixels, allowing for the layout of the slides, and they all float left for positioning.', 'The slider wrapper has a width of 720 and any overflow is hidden. The slider wrapper has a width of 720 pixels, and any overflow is hidden to contain the slider.', "The user won't even notice it because it's the exact same slide. When the slider reaches the last slide, the user won't notice as it seamlessly goes back to margin zero, appearing as the same slide."]}], 'duration': 109.145, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o1286.jpg', 'highlights': ['The slides UL has a width of 6,000 pixels and then all the slides float left.', 'The slider wrapper has a width of 720 and any overflow is hidden.', "When the slider reaches the last slide, the user won't notice as it seamlessly goes back to margin zero."]}, {'end': 429.578, 'segs': [{'end': 138.83, 'src': 'embed', 'start': 111.992, 'weight': 0, 'content': [{'end': 117.276, 'text': "One piece of code you'll need to know in JavaScript that if you don't know how to do it yet is setInterval.", 'start': 111.992, 'duration': 5.284}, {'end': 120.058, 'text': 'setInterval takes two things.', 'start': 118.497, 'duration': 1.561}, {'end': 126.264, 'text': "It takes a function and then it takes a time frame like, let's say, a thousand milliseconds, which is one second,", 'start': 120.118, 'duration': 6.146}, {'end': 129.626, 'text': 'and every thousand milliseconds it will fire this function.', 'start': 126.264, 'duration': 3.362}, {'end': 132.127, 'text': 'so as an example, I can do this.', 'start': 129.626, 'duration': 2.501}, {'end': 135.168, 'text': 'I can go every thousand milliseconds.', 'start': 132.127, 'duration': 3.041}, {'end': 138.83, 'text': "we're going to log the date, new date.", 'start': 135.168, 'duration': 3.662}], 'summary': 'Javascript setinterval fires a function every 1000 milliseconds.', 'duration': 26.838, 'max_score': 111.992, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o111992.jpg'}, {'end': 201.798, 'src': 'embed', 'start': 160.864, 'weight': 1, 'content': [{'end': 163.286, 'text': 'give it the one you want to clear and it stops it.', 'start': 160.864, 'duration': 2.422}, {'end': 168.87, 'text': "So that's kind of, we don't want it to automatically run forever, we want to have the ability to start it and stop it.", 'start': 163.926, 'duration': 4.944}, {'end': 170.672, 'text': "So we're going to save our interval.", 'start': 169.331, 'duration': 1.341}, {'end': 175.016, 'text': 'And then we need to use jQuery to animate this slider.', 'start': 171.212, 'duration': 3.804}, {'end': 176.237, 'text': 'and how you do that is.', 'start': 175.016, 'duration': 1.221}, {'end': 177.538, 'text': 'you do.', 'start': 176.237, 'duration': 1.301}, {'end': 179.179, 'text': "I'll show you over here.", 'start': 177.538, 'duration': 1.641}, {'end': 190.732, 'text': "you do jQuery selector, animate and then you're going to give it an object which is all the CSS properties and what you want to animate them to.", 'start': 179.179, 'duration': 11.553}, {'end': 197.796, 'text': "you can animate more than one thing at a time, but in our case we're just doing margin left, a time frame again, like how many milliseconds,", 'start': 190.732, 'duration': 7.064}, {'end': 201.798, 'text': 'and then a callback, which is if you want it to do something.', 'start': 197.796, 'duration': 4.002}], 'summary': 'Using jquery to animate slider with margin left property and time frame in milliseconds.', 'duration': 40.934, 'max_score': 160.864, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o160864.jpg'}, {'end': 333.799, 'src': 'embed', 'start': 282.639, 'weight': 3, 'content': [{'end': 284.559, 'text': 'And then I also want to add another feature.', 'start': 282.639, 'duration': 1.92}, {'end': 289.18, 'text': 'I want to listen for mouse enter and pause.', 'start': 284.579, 'duration': 4.601}, {'end': 291.46, 'text': 'So if you hover over the slider, I want it to pause.', 'start': 289.639, 'duration': 1.821}, {'end': 296.042, 'text': "And you know, while I'm looking at that slide and then resume on mouse, leave.", 'start': 291.9, 'duration': 4.142}, {'end': 300.204, 'text': 'So when I leave, I want it to start sliding again.', 'start': 298.083, 'duration': 2.121}, {'end': 301.904, 'text': "So that's basically what my slider is going to be.", 'start': 300.384, 'duration': 1.52}, {'end': 309.508, 'text': "Let's start building this out, set interval and let's make it run every three seconds.", 'start': 301.944, 'duration': 7.564}, {'end': 318.392, 'text': "And every three seconds, I'm going to go slider, slider slides.animate.", 'start': 311.809, 'duration': 6.583}, {'end': 322.347, 'text': 'Just what I showed you before.', 'start': 321.266, 'duration': 1.081}, {'end': 325.55, 'text': 'Margin left is going to go negative 7.', 'start': 323.328, 'duration': 2.222}, {'end': 328.573, 'text': 'Nope, negative equals 720 pixels.', 'start': 325.55, 'duration': 3.023}, {'end': 331.196, 'text': "Because I don't just want to go to negative 720 pixels.", 'start': 328.874, 'duration': 2.322}, {'end': 333.799, 'text': 'I want to keep subtracting 720 every time.', 'start': 331.216, 'duration': 2.583}], 'summary': 'Creating a slider that pauses on mouse enter and resumes on mouse leave, sliding every 3 seconds.', 'duration': 51.16, 'max_score': 282.639, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o282639.jpg'}, {'end': 412.525, 'src': 'embed', 'start': 380.673, 'weight': 5, 'content': [{'end': 386.535, 'text': "I'm going to go var animation speed equals 1,000.", 'start': 380.673, 'duration': 5.862}, {'end': 391.377, 'text': 'And then var pause equals 3,000.', 'start': 386.535, 'duration': 4.842}, {'end': 393.338, 'text': "So now I'm going to make this pause.", 'start': 391.377, 'duration': 1.961}, {'end': 394.078, 'text': 'There we go.', 'start': 393.598, 'duration': 0.48}, {'end': 395.959, 'text': 'Animation speed.', 'start': 394.919, 'duration': 1.04}, {'end': 399.66, 'text': 'And u, I will just go negative 720 plus width.', 'start': 397.259, 'duration': 2.401}, {'end': 409.102, 'text': "So that basically is the same as saying negative equals 720, except for now I'm just storing my 720p here.", 'start': 402.677, 'duration': 6.425}, {'end': 412.525, 'text': "So if at any point in time I want to change the configuration, it's all in one place.", 'start': 409.342, 'duration': 3.183}], 'summary': 'Configured animation speed to 1000 and pause to 3000 for easy access and modification.', 'duration': 31.852, 'max_score': 380.673, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o380673.jpg'}], 'start': 111.992, 'title': 'Javascript setinterval and jquery slider', 'summary': 'Covers javascript setinterval for regular function execution and jquery animation of css properties with specific time frames. it also discusses building a slider with jquery, including intervals, margin left animation, mouse enter and pause events, and configuration options.', 'chapters': [{'end': 253.073, 'start': 111.992, 'title': 'Javascript setinterval and jquery animation', 'summary': 'Covers the usage of setinterval in javascript to execute a function at regular intervals, and demonstrates how to use jquery to animate css properties, such as margin left, with specific time frames, like one second, and callbacks.', 'duration': 141.081, 'highlights': ['The setInterval function in JavaScript takes a function and a time frame, like a thousand milliseconds, and executes the function at every interval, displaying quantifiable data such as the log of the new date.', 'Demonstration of using clearInterval to stop the execution of setInterval, providing the ability to start and stop the interval, showcasing practical implementation of quantifiable data manipulation.', 'Illustration of using jQuery to animate CSS properties, specifically demonstrating the animation of margin left with a time frame of one second, providing practical application and quantifiable data of the animation process.']}, {'end': 429.578, 'start': 253.093, 'title': 'Building a slider with jquery', 'summary': 'Discusses building a slider with jquery, including setting intervals, animating margin left, listening for mouse enter and pause, and organizing configuration options in one place.', 'duration': 176.485, 'highlights': ['Setting interval to run the slider every three seconds and animating margin left by subtracting 720 pixels each time.', 'Implementing mouse enter and leave functionality to pause and resume the slider.', 'Organizing configuration options in one place by defining variables for slide width, animation speed, and pause duration.']}], 'duration': 317.586, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o111992.jpg', 'highlights': ['The setInterval function in JavaScript takes a function and a time frame, like a thousand milliseconds, and executes the function at every interval, displaying quantifiable data such as the log of the new date.', 'Demonstration of using clearInterval to stop the execution of setInterval, providing the ability to start and stop the interval, showcasing practical implementation of quantifiable data manipulation.', 'Illustration of using jQuery to animate CSS properties, specifically demonstrating the animation of margin left with a time frame of one second, providing practical application and quantifiable data of the animation process.', 'Setting interval to run the slider every three seconds and animating margin left by subtracting 720 pixels each time.', 'Implementing mouse enter and leave functionality to pause and resume the slider.', 'Organizing configuration options in one place by defining variables for slide width, animation speed, and pause duration.']}, {'end': 1029.741, 'segs': [{'end': 459.129, 'src': 'embed', 'start': 430.816, 'weight': 0, 'content': [{'end': 437.52, 'text': 'Another thing I want to do to Save configuration is I want to do.', 'start': 430.816, 'duration': 6.704}, {'end': 438.721, 'text': "it's called caching the Dom.", 'start': 437.52, 'duration': 1.201}, {'end': 444.244, 'text': "I think I've covered this in some other videos, But I don't want to have to look for slider slides every time.", 'start': 438.721, 'duration': 5.523}, {'end': 448.007, 'text': 'I want to be able to look for it once and then just reference it every time.', 'start': 444.244, 'duration': 3.763}, {'end': 455.251, 'text': "so I'm actually going to go there slider.", 'start': 448.007, 'duration': 7.244}, {'end': 455.771, 'text': 'There we go.', 'start': 455.251, 'duration': 0.52}, {'end': 459.129, 'text': 'so I searched the Dom and And I found my slider.', 'start': 455.771, 'duration': 3.358}], 'summary': 'Implementing caching for configuration to avoid repeated search for slider slides in the dom.', 'duration': 28.313, 'max_score': 430.816, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o430816.jpg'}, {'end': 540.134, 'src': 'embed', 'start': 508.042, 'weight': 1, 'content': [{'end': 510.984, 'text': "that's a very fast operation.", 'start': 508.042, 'duration': 2.942}, {'end': 514.886, 'text': "so now, once again, you'll noticing I've only done my jQuery selector once.", 'start': 510.984, 'duration': 3.902}, {'end': 518.39, 'text': 'so this is going to be a very fast and high-performance piece of code.', 'start': 514.886, 'duration': 3.504}, {'end': 520.227, 'text': 'And then I want to go.', 'start': 519.207, 'duration': 1.02}, {'end': 521.668, 'text': "let's go slides as well.", 'start': 520.227, 'duration': 1.441}, {'end': 527.59, 'text': 'Equals slide container.', 'start': 522.587, 'duration': 5.003}, {'end': 530.451, 'text': "Yeah, that's right.", 'start': 527.61, 'duration': 2.841}, {'end': 533.852, 'text': 'Find slide.', 'start': 531.691, 'duration': 2.161}, {'end': 537.734, 'text': "So that's going to be the whole list of my slide elements.", 'start': 534.612, 'duration': 3.122}, {'end': 540.134, 'text': 'So this is actually slide container.', 'start': 538.314, 'duration': 1.82}], 'summary': 'Optimized jquery code for high performance with minimal selectors.', 'duration': 32.092, 'max_score': 508.042, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o508042.jpg'}, {'end': 607.344, 'src': 'heatmap', 'start': 565.487, 'weight': 3, 'content': [{'end': 568.509, 'text': 'So now every time it has to do the animation, it just goes boom.', 'start': 565.487, 'duration': 3.022}, {'end': 569.55, 'text': 'I already know where that is.', 'start': 568.569, 'duration': 0.981}, {'end': 570.671, 'text': "I'm going to find it and animate it.", 'start': 569.57, 'duration': 1.101}, {'end': 572.192, 'text': "It's a much faster piece of code.", 'start': 570.911, 'duration': 1.281}, {'end': 581.18, 'text': "So now what I need to do is I need to start checking afterwards to see if I'm on the last slide or not.", 'start': 572.814, 'duration': 8.366}, {'end': 585.623, 'text': "What I will do here is I'm going to add a callback.", 'start': 583.401, 'duration': 2.222}, {'end': 590.086, 'text': 'Remember I said the third thing you can pass to animate is a callback.', 'start': 586.783, 'duration': 3.303}, {'end': 594.529, 'text': "So once the animation is done, I want to check if I'm on the last slide.", 'start': 590.566, 'duration': 3.963}, {'end': 597.19, 'text': 'If I am on the last slide, I go to the first slide.', 'start': 594.889, 'duration': 2.301}, {'end': 602.454, 'text': "So if, and I'm going to do this.", 'start': 597.811, 'duration': 4.643}, {'end': 604.002, 'text': "Let's do this.", 'start': 603.541, 'duration': 0.461}, {'end': 607.344, 'text': "Let's go plus plus or current slide.", 'start': 604.022, 'duration': 3.322}], 'summary': 'Improving animation speed and adding callback to check last slide.', 'duration': 41.857, 'max_score': 565.487, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o565487.jpg'}, {'end': 979.75, 'src': 'embed', 'start': 945.92, 'weight': 5, 'content': [{'end': 949.242, 'text': "so that way we could say on mouse enter, we're going to stop slider.", 'start': 945.92, 'duration': 3.322}, {'end': 954.086, 'text': "on mouse leave, we're going to start slider and then we define this interval thing here.", 'start': 949.242, 'duration': 4.844}, {'end': 957.248, 'text': 'let me go just for your learning about JavaScript.', 'start': 954.086, 'duration': 3.162}, {'end': 965.904, 'text': "if we did interval here, We just made interval, a new variable, but it's only going to stay within my function.", 'start': 957.248, 'duration': 8.656}, {'end': 972.367, 'text': "So stop slider will not work because when I hit clear interval it's not going to know where to find interval.", 'start': 966.404, 'duration': 5.963}, {'end': 979.75, 'text': 'A function only has access to the variables inside of it and the variables up one level which are all these guys.', 'start': 972.887, 'duration': 6.863}], 'summary': 'Using mouse events to control slider and explaining variable scope in javascript.', 'duration': 33.83, 'max_score': 945.92, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o945920.jpg'}], 'start': 430.816, 'title': 'Improving web performance with dom caching and creating jquery slider', 'summary': 'Discusses the benefits of caching the dom to achieve faster operations and high-performance code, and it explains the creation of a jquery slider with animation, callbacks, and user interaction features for smooth transitions.', 'chapters': [{'end': 564.986, 'start': 430.816, 'title': 'Caching the dom for high performance', 'summary': 'Discusses caching the dom to improve performance by searching the web page once and then referencing elements, resulting in faster operations and high-performance code.', 'duration': 134.17, 'highlights': ['Caching the DOM by searching the web page once and then referencing elements results in a very fast and high-performance piece of code, improving efficiency and speed.', 'Using jQuery selectors to search for elements such as sliders and slide containers allows for efficient referencing and high performance in code execution.', 'The process of finding specific elements within the initially searched DOM element leads to faster operations and improved code performance.']}, {'end': 1029.741, 'start': 565.487, 'title': 'Creating jquery slider with animation and callbacks', 'summary': 'Explains the process of creating a jquery slider with animation, callbacks, and functionality to pause and resume the slider on mouse enter and leave, ensuring smooth transitions and user interaction.', 'duration': 464.254, 'highlights': ['The chapter discusses optimizing code by utilizing animation to locate and animate specific elements, resulting in faster execution.', 'The process of checking for the last slide and implementing a callback function to handle the transition from the last slide to the first slide is explained in detail.', 'The creation of functions to start and stop the slider on mouse enter and leave events is demonstrated, highlighting the use of interval and callback functions in JavaScript.']}], 'duration': 598.925, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/KkzVFB3Ba_o/pics/KkzVFB3Ba_o430816.jpg', 'highlights': ['Caching the DOM by searching the web page once and then referencing elements results in a very fast and high-performance piece of code, improving efficiency and speed.', 'Using jQuery selectors to search for elements such as sliders and slide containers allows for efficient referencing and high performance in code execution.', 'The process of finding specific elements within the initially searched DOM element leads to faster operations and improved code performance.', 'The chapter discusses optimizing code by utilizing animation to locate and animate specific elements, resulting in faster execution.', 'The process of checking for the last slide and implementing a callback function to handle the transition from the last slide to the first slide is explained in detail.', 'The creation of functions to start and stop the slider on mouse enter and leave events is demonstrated, highlighting the use of interval and callback functions in JavaScript.']}], 'highlights': ['The setInterval function in JavaScript takes a function and a time frame, like a thousand milliseconds, and executes the function at every interval, displaying quantifiable data such as the log of the new date.', 'Demonstration of using clearInterval to stop the execution of setInterval, providing the ability to start and stop the interval, showcasing practical implementation of quantifiable data manipulation.', 'Illustration of using jQuery to animate CSS properties, specifically demonstrating the animation of margin left with a time frame of one second, providing practical application and quantifiable data of the animation process.', 'Caching the DOM by searching the web page once and then referencing elements results in a very fast and high-performance piece of code, improving efficiency and speed.', 'Using jQuery selectors to search for elements such as sliders and slide containers allows for efficient referencing and high performance in code execution.', 'The process of finding specific elements within the initially searched DOM element leads to faster operations and improved code performance.']}