1 00:00:01,410 --> 00:00:03,510 In this video we're gonna implement 2 00:00:03,510 --> 00:00:08,510 a very popular component which is a tabbed component. 3 00:00:08,550 --> 00:00:10,500 And you will see tabbed components 4 00:00:10,500 --> 00:00:12,870 on many websites these days. 5 00:00:12,870 --> 00:00:16,163 So it's great to learn how to build one yourself. 6 00:00:17,850 --> 00:00:19,940 So the component that we're gonna build 7 00:00:19,940 --> 00:00:22,650 in this video is this one. 8 00:00:22,650 --> 00:00:26,660 Now a tabbed component can appear in many different ways, 9 00:00:26,660 --> 00:00:28,440 but what they all have in common 10 00:00:28,440 --> 00:00:32,210 is that they have some kind of tabs like this here. 11 00:00:32,210 --> 00:00:33,630 And when you clicked it up 12 00:00:33,630 --> 00:00:38,380 then the content of this area below will change. 13 00:00:38,380 --> 00:00:42,770 And so that's exactly what happens here with these buttons. 14 00:00:42,770 --> 00:00:45,360 So basically these three are our tabs. 15 00:00:45,360 --> 00:00:47,930 And then as we click on one of the tabs, 16 00:00:47,930 --> 00:00:50,850 it will reveal the associated content. 17 00:00:50,850 --> 00:00:55,170 So a little bit like tabs here in our browser, right? 18 00:00:55,170 --> 00:00:58,810 So each browser tab has its own webpage. 19 00:00:58,810 --> 00:01:03,370 And so here each tab has its own content area, basically. 20 00:01:03,370 --> 00:01:06,130 So I'm sure you've seen this on other websites 21 00:01:06,130 --> 00:01:09,653 and so let's now go ahead and implement this ourselves. 22 00:01:10,808 --> 00:01:13,940 Okay, now for this component, 23 00:01:13,940 --> 00:01:16,713 we actually need a bunch of HTML. 24 00:01:18,040 --> 00:01:20,780 So let's first take a look at that. 25 00:01:20,780 --> 00:01:22,690 So the whole tabbed component 26 00:01:22,690 --> 00:01:25,423 in our case is called operations. 27 00:01:26,480 --> 00:01:28,253 So let's scroll down here also. 28 00:01:29,950 --> 00:01:33,100 And so this section here is about the operations 29 00:01:33,100 --> 00:01:34,940 we can do on a bank account 30 00:01:34,940 --> 00:01:38,153 and therefore this component here is called operations. 31 00:01:39,040 --> 00:01:42,040 And you can also see that here on the page. 32 00:01:42,040 --> 00:01:45,740 Then we have a the tab container basically. 33 00:01:45,740 --> 00:01:47,143 So that's this element. 34 00:01:49,000 --> 00:01:51,090 And so you can also see it here again 35 00:01:51,090 --> 00:01:54,630 and it's the element which will contain the three tabs. 36 00:01:54,630 --> 00:01:57,680 And so each tab is itself a button 37 00:01:57,680 --> 00:02:02,680 and it has this class of operations tab, okay? 38 00:02:02,810 --> 00:02:05,163 Then below that we have the content. 39 00:02:07,100 --> 00:02:10,100 And in fact, we have three contents. 40 00:02:10,100 --> 00:02:14,463 So we have one content element here for each of the tabs. 41 00:02:15,579 --> 00:02:17,920 All right, so the first one here as you see 42 00:02:17,920 --> 00:02:20,950 is called operations-content-1 43 00:02:20,950 --> 00:02:23,550 then the other one is operations-content-2 44 00:02:23,550 --> 00:02:25,810 and operations-content-3. 45 00:02:25,810 --> 00:02:28,320 So as we click on one of these tabs, 46 00:02:28,320 --> 00:02:30,910 we will not create any new content. 47 00:02:30,910 --> 00:02:35,293 What we will do instead is to hide the other tabs basically. 48 00:02:36,540 --> 00:02:39,530 So you see that right now this first one here 49 00:02:39,530 --> 00:02:43,000 has the operations content active class. 50 00:02:43,000 --> 00:02:45,080 And so therefore this one is visible 51 00:02:45,080 --> 00:02:46,723 and all the others are hidden. 52 00:02:48,010 --> 00:02:50,900 And what's also important here is that 53 00:02:52,640 --> 00:02:56,350 these buttons here, they have this data tab attribute. 54 00:02:56,350 --> 00:02:58,170 And so this one is number one 55 00:02:58,170 --> 00:03:01,990 and this will then be associated with this class name here. 56 00:03:01,990 --> 00:03:05,310 So operations content and then again one 57 00:03:05,310 --> 00:03:07,370 but more about that in a minute 58 00:03:07,370 --> 00:03:10,040 when we actually implement this ourselves. 59 00:03:10,040 --> 00:03:11,920 So for now we just need to get down 60 00:03:11,920 --> 00:03:14,770 the basic structure of the HTML here. 61 00:03:14,770 --> 00:03:17,940 And it might be a good idea for you to pause the video 62 00:03:17,940 --> 00:03:21,250 and take a minute or two to get yourself familiar 63 00:03:21,250 --> 00:03:23,140 with this HTML structure 64 00:03:23,140 --> 00:03:27,780 and all of the class names that are involved here, okay? 65 00:03:27,780 --> 00:03:30,480 And you can even take a look at the CSS 66 00:03:31,540 --> 00:03:36,000 because there's also a lot of CSS involved here, all right? 67 00:03:37,300 --> 00:03:40,050 So of course I couldn't write all of this code here 68 00:03:40,050 --> 00:03:44,053 together with you now, because that would take way too long. 69 00:03:45,880 --> 00:03:47,360 All right, but anyway 70 00:03:47,360 --> 00:03:49,783 let's not build this tabbed component here. 71 00:03:53,620 --> 00:03:57,160 And we're gonna start by selecting the tabs, okay? 72 00:03:57,160 --> 00:04:00,510 And that will keep the elements here open 73 00:04:00,510 --> 00:04:02,923 so we can see it at all time. 74 00:04:04,160 --> 00:04:05,450 And so you'll see that the buttons 75 00:04:05,450 --> 00:04:08,483 they have the class operations tab. 76 00:04:10,590 --> 00:04:14,267 So tabs=documents.querySelectorAll 77 00:04:17,989 --> 00:04:21,239 and then with the class operations_tab. 78 00:04:25,920 --> 00:04:29,110 Then let's also select the tabs container 79 00:04:36,217 --> 00:04:38,967 and so that is this element here. 80 00:04:41,170 --> 00:04:42,970 Let's actually go ahead and copy it. 81 00:04:46,820 --> 00:04:49,623 And finally, also the three content areas. 82 00:04:50,900 --> 00:04:55,900 So that's here, operations content. 83 00:04:56,830 --> 00:05:00,200 You see I cannot copy it for some reason. 84 00:05:00,200 --> 00:05:01,100 It doesn't matter. 85 00:05:03,430 --> 00:05:07,583 So a tabs content is document.querySelectorAll. 86 00:05:10,070 --> 00:05:12,443 So because again, we have three of them. 87 00:05:17,950 --> 00:05:21,920 All right, so we have our selections nicely done 88 00:05:21,920 --> 00:05:26,020 and now we can actually work on the functionality 89 00:05:26,020 --> 00:05:28,470 and let's start by adding event handlers 90 00:05:28,470 --> 00:05:31,340 to these buttons here, right? 91 00:05:31,340 --> 00:05:34,640 Because that is the action that we actually want to handle 92 00:05:34,640 --> 00:05:36,320 in this component. 93 00:05:36,320 --> 00:05:38,740 So we could do it like this. 94 00:05:38,740 --> 00:05:41,990 So taking all the tabs and then on each of them 95 00:05:41,990 --> 00:05:43,783 we could attach an event handler. 96 00:05:45,570 --> 00:05:47,073 So for example, like this. 97 00:05:47,960 --> 00:05:51,740 So for each, because we want to do it on each of them, 98 00:05:51,740 --> 00:05:56,740 so we get then each tab and then tab.addEventListener click. 99 00:06:00,840 --> 00:06:03,140 And let's just use a quick arrow function here 100 00:06:04,800 --> 00:06:07,483 because this is really just a demonstration. 101 00:06:11,890 --> 00:06:13,600 Well, nothing happens. 102 00:06:13,600 --> 00:06:15,453 Let's try to reload this page. 103 00:06:17,250 --> 00:06:21,490 Yeah indeed, now we get the tab locked to the console. 104 00:06:21,490 --> 00:06:25,640 Now, however, as we already learned in the last video 105 00:06:25,640 --> 00:06:28,570 doing this here is a bad practice 106 00:06:28,570 --> 00:06:32,180 because what if we had like 200 tabs? 107 00:06:32,180 --> 00:06:34,080 Then we would have 200 copies 108 00:06:34,080 --> 00:06:36,610 of this exact callback function here 109 00:06:36,610 --> 00:06:39,290 and that would simply slow down the page. 110 00:06:39,290 --> 00:06:41,890 So that's not at all desirable. 111 00:06:41,890 --> 00:06:44,520 And so let's get rid of this 112 00:06:44,520 --> 00:06:47,870 and one more time, use events delegation. 113 00:06:47,870 --> 00:06:50,270 And remember that for event delegation, 114 00:06:50,270 --> 00:06:52,320 we need to attach the event handler 115 00:06:52,320 --> 00:06:54,140 on the common parent element 116 00:06:54,140 --> 00:06:57,040 of all the elements that we're interested in. 117 00:06:57,040 --> 00:07:01,563 And in our case, that is this tabs container, right? 118 00:07:02,930 --> 00:07:04,383 So we have our buttons here. 119 00:07:06,700 --> 00:07:09,220 So right here or buttons 120 00:07:09,220 --> 00:07:11,370 and a common parent of all of them 121 00:07:11,370 --> 00:07:15,320 is this tab container that we already selected previously. 122 00:07:15,320 --> 00:07:18,160 And so let's attach our event handler 123 00:07:18,160 --> 00:07:19,803 to that element instead. 124 00:07:21,190 --> 00:07:25,497 So tabsContainer.AddEventListener, click, 125 00:07:29,830 --> 00:07:31,410 we need the event of course, 126 00:07:31,410 --> 00:07:34,630 so that we can figure out where the click happened. 127 00:07:34,630 --> 00:07:36,740 And so let's now actually work on 128 00:07:36,740 --> 00:07:39,660 or matching strategy, okay? 129 00:07:39,660 --> 00:07:43,580 So we already know that we are interested in the buttons. 130 00:07:43,580 --> 00:07:46,803 And so let's now figure out which button was clicked. 131 00:07:47,650 --> 00:07:50,260 So let's actually create an element called clicked 132 00:07:51,420 --> 00:07:53,593 that we can then use to work with. 133 00:07:54,810 --> 00:07:56,683 And so what about this? 134 00:07:57,700 --> 00:08:00,713 So what about simply using the e.target? 135 00:08:01,730 --> 00:08:02,723 Well, let's see. 136 00:08:06,570 --> 00:08:10,920 So in our console, let's now click somewhere here 137 00:08:10,920 --> 00:08:15,920 and indeed now we got the button that was clicked, okay? 138 00:08:16,030 --> 00:08:17,600 However, there is a problem 139 00:08:17,600 --> 00:08:19,900 when we click here on this number. 140 00:08:19,900 --> 00:08:22,660 So you see that now we did not get a button 141 00:08:22,660 --> 00:08:24,733 but we got this spin element. 142 00:08:25,650 --> 00:08:27,840 And that's because inside of this button, 143 00:08:27,840 --> 00:08:30,120 we actually have another element. 144 00:08:30,120 --> 00:08:31,730 And so now, even though 145 00:08:31,730 --> 00:08:34,760 it looked like we clicked on the button here 146 00:08:34,760 --> 00:08:36,580 or here for example, 147 00:08:36,580 --> 00:08:41,450 actually we are clicking on this span element, right? 148 00:08:41,450 --> 00:08:44,280 So we are not actually clicking on the button, 149 00:08:44,280 --> 00:08:46,680 but we still need the button. 150 00:08:46,680 --> 00:08:49,550 So no matter if we click on this button itself 151 00:08:49,550 --> 00:08:51,430 or here on the span element 152 00:08:51,430 --> 00:08:54,090 we actually need the button element itself 153 00:08:54,090 --> 00:08:55,670 because from that button 154 00:08:55,670 --> 00:08:59,410 we will need to read this data tab attribute here 155 00:08:59,410 --> 00:09:01,400 because as I mentioned earlier, 156 00:09:01,400 --> 00:09:03,640 this one contains the number of the tab 157 00:09:03,640 --> 00:09:05,530 that should become visible. 158 00:09:05,530 --> 00:09:07,140 And so here this data attribute 159 00:09:07,140 --> 00:09:11,223 becomes really important to store information in the DOM. 160 00:09:12,130 --> 00:09:15,550 So basically we need a way of finding the button element 161 00:09:15,550 --> 00:09:20,053 whenever we click on this span element, right? 162 00:09:20,920 --> 00:09:25,920 Now, one simple way to fix it, 163 00:09:25,990 --> 00:09:28,267 which would not really fix it actually 164 00:09:28,267 --> 00:09:30,830 is to do some DOM traversing 165 00:09:30,830 --> 00:09:34,060 and simply select the parent element. 166 00:09:34,060 --> 00:09:35,910 We can move up the DOM tree 167 00:09:35,910 --> 00:09:39,250 and instead of simply taking a e.target 168 00:09:39,250 --> 00:09:41,890 we can use the parent element of that. 169 00:09:41,890 --> 00:09:43,440 So let's see what happens then. 170 00:09:44,560 --> 00:09:47,010 And so now indeed when we click on the number, 171 00:09:47,010 --> 00:09:48,690 we get the button. 172 00:09:48,690 --> 00:09:52,310 And so again that's because that is the parent element 173 00:09:52,310 --> 00:09:53,850 of that span. 174 00:09:53,850 --> 00:09:55,380 Now the problem appears 175 00:09:55,380 --> 00:09:57,700 when we click on the button itself, 176 00:09:57,700 --> 00:10:00,610 because now of course we will also get the parent 177 00:10:00,610 --> 00:10:02,260 of the button element. 178 00:10:02,260 --> 00:10:04,890 And so that is this container. 179 00:10:04,890 --> 00:10:08,290 But of course that is not what we want. 180 00:10:08,290 --> 00:10:11,140 So basically what we want is to get the button, 181 00:10:11,140 --> 00:10:14,340 no matter if we click here on the span 182 00:10:14,340 --> 00:10:17,000 or on the button itself. 183 00:10:17,000 --> 00:10:19,930 So we need a way of selecting the parent element 184 00:10:19,930 --> 00:10:22,200 that is always a tab. 185 00:10:22,200 --> 00:10:24,520 And can you think of a special method 186 00:10:24,520 --> 00:10:26,953 that we learned previously to do that? 187 00:10:27,850 --> 00:10:32,023 Well, the solution is right here in the previous video. 188 00:10:33,160 --> 00:10:35,313 Well, and that's down here somewhere. 189 00:10:37,200 --> 00:10:41,193 So remember that we want a way of going upwards, 190 00:10:42,310 --> 00:10:45,080 but we want to specify that we want to select 191 00:10:45,080 --> 00:10:46,950 an operations tab. 192 00:10:46,950 --> 00:10:51,770 And so we can use this closest method for exactly that. 193 00:10:51,770 --> 00:10:53,400 So remember that I said 194 00:10:53,400 --> 00:10:56,160 that this method is gonna be really helpful 195 00:10:56,160 --> 00:10:58,070 in event delegation. 196 00:10:58,070 --> 00:10:59,973 And so now that's actually the case. 197 00:11:01,240 --> 00:11:04,700 Okay, so this method makes it really easy for us 198 00:11:04,700 --> 00:11:06,590 to dynamically get the element 199 00:11:06,590 --> 00:11:08,380 that we're interested in. 200 00:11:08,380 --> 00:11:11,570 So here, instead of always selecting the parent element 201 00:11:11,570 --> 00:11:16,570 we will search basically for the closest operations tab. 202 00:11:17,470 --> 00:11:21,833 And so here we need to do the exact same query as that. 203 00:11:23,487 --> 00:11:27,600 All right, and this should actually now fix our problem. 204 00:11:27,600 --> 00:11:30,840 So let's see, when we click the button itself 205 00:11:30,840 --> 00:11:32,370 then we get the button 206 00:11:32,370 --> 00:11:35,950 and when we click the number here so the span, 207 00:11:35,950 --> 00:11:37,640 then we also get the button 208 00:11:37,640 --> 00:11:40,070 because now it finds the closest parent 209 00:11:40,070 --> 00:11:41,340 with this class name, 210 00:11:41,340 --> 00:11:44,550 which indeed is the button itself, so the tab 211 00:11:45,560 --> 00:11:47,540 And here we get to tab number two 212 00:11:47,540 --> 00:11:48,973 as you can see down here. 213 00:11:49,970 --> 00:11:53,633 And here we get tab number three, great. 214 00:11:57,020 --> 00:11:59,100 And let's actually immediately do something 215 00:11:59,100 --> 00:12:01,760 with this select the tab. 216 00:12:01,760 --> 00:12:05,270 So the tab that is currently active here 217 00:12:05,270 --> 00:12:07,230 has a different style as you can see. 218 00:12:07,230 --> 00:12:09,230 So it's a bit moved up. 219 00:12:09,230 --> 00:12:13,200 And so that's because the active tab 220 00:12:13,200 --> 00:12:15,133 basically has this class. 221 00:12:16,220 --> 00:12:17,373 So where's that? 222 00:12:18,240 --> 00:12:21,883 It has this clap of operations tab active. 223 00:12:23,860 --> 00:12:27,650 All right, so we can simply add that 224 00:12:27,650 --> 00:12:30,490 to the element that was just clicked. 225 00:12:30,490 --> 00:12:35,490 So classList.add operations_tab_active, okay? 226 00:12:39,070 --> 00:12:40,590 And now as we click 227 00:12:40,590 --> 00:12:44,140 you see that it activates basically does tab. 228 00:12:44,140 --> 00:12:45,290 Now of course later 229 00:12:45,290 --> 00:12:48,440 then all the other tabs we'll have to move down 230 00:12:48,440 --> 00:12:52,150 but we're gonna take care of that in a second. 231 00:12:52,150 --> 00:12:55,400 Because now watch what happens when we actually click 232 00:12:55,400 --> 00:12:57,710 on the tabs container itself. 233 00:12:57,710 --> 00:12:59,770 So outside of any of the buttons 234 00:12:59,770 --> 00:13:01,780 but still in the tabs container 235 00:13:01,780 --> 00:13:04,863 where this EventListener is actually attached to. 236 00:13:06,270 --> 00:13:09,930 So you see that we get null here 237 00:13:09,930 --> 00:13:12,550 and that's because null is the results 238 00:13:12,550 --> 00:13:14,850 of the closest method here 239 00:13:14,850 --> 00:13:18,740 when there is no matching parent element to be found. 240 00:13:18,740 --> 00:13:22,690 So of course, when we click here in this tabs container 241 00:13:22,690 --> 00:13:27,420 then there is gonna be no parent with this class. 242 00:13:27,420 --> 00:13:30,860 And so therefore, as I just said, we get to null. 243 00:13:30,860 --> 00:13:33,810 And so we need to fix that now in our code 244 00:13:33,810 --> 00:13:38,150 and basically ignore any clicks that happen on that area. 245 00:13:38,150 --> 00:13:41,520 So basically ignore any clicks 246 00:13:41,520 --> 00:13:46,270 where the result is then null, all right? 247 00:13:46,270 --> 00:13:48,460 So we can do that by saying, 248 00:13:48,460 --> 00:13:53,460 if there is no clicked, then return immediately. 249 00:13:55,070 --> 00:13:57,890 And this is something that we haven't done before. 250 00:13:57,890 --> 00:14:01,683 So what I'm doing here is called a guard clause. 251 00:14:04,170 --> 00:14:06,400 So it's basically an if statement 252 00:14:06,400 --> 00:14:10,820 which will return early if some condition is matched. 253 00:14:10,820 --> 00:14:13,720 So in this case, when there's nothing clicked 254 00:14:13,720 --> 00:14:16,950 then we want to immediately finish this function. 255 00:14:16,950 --> 00:14:21,890 And in this case, when we have null which is a faulty value, 256 00:14:21,890 --> 00:14:25,060 then not faulty will become true 257 00:14:25,060 --> 00:14:26,770 and then the function will return 258 00:14:26,770 --> 00:14:30,470 and none of the code that's after it will be executed. 259 00:14:30,470 --> 00:14:33,220 But of course, if clicked does exist 260 00:14:33,220 --> 00:14:35,820 then this return will not be executed 261 00:14:35,820 --> 00:14:40,130 and the rest of the code will be executed just fine. 262 00:14:40,130 --> 00:14:44,083 So this is a more modern way of writing this. 263 00:14:45,380 --> 00:14:47,780 So we could have written instead also, 264 00:14:47,780 --> 00:14:52,230 if there is a clicked on element, then do this. 265 00:14:52,230 --> 00:14:54,300 And this is the more traditional way 266 00:14:54,300 --> 00:14:56,880 as we have been doing it all the time. 267 00:14:56,880 --> 00:14:59,050 But this is actually more modern 268 00:14:59,050 --> 00:15:01,290 because it looks a bit nicer 269 00:15:01,290 --> 00:15:05,470 because we don't need to create all these additional blocks. 270 00:15:05,470 --> 00:15:07,300 So in this case, just this block 271 00:15:07,300 --> 00:15:10,090 but sometimes when we have so many conditions 272 00:15:10,090 --> 00:15:12,550 it can become a little bit confusing. 273 00:15:12,550 --> 00:15:14,860 And then it's a bit cleaner 274 00:15:14,860 --> 00:15:17,320 to simply return the function immediately 275 00:15:17,320 --> 00:15:19,800 if a certain condition is matched. 276 00:15:19,800 --> 00:15:21,130 And again in this case, 277 00:15:21,130 --> 00:15:23,710 whenever there is no clicked element here 278 00:15:23,710 --> 00:15:27,000 then we want to simply return to function right away. 279 00:15:27,000 --> 00:15:29,770 And so then that code here will not be executed 280 00:15:30,760 --> 00:15:34,950 but otherwise, of course it will be executed. 281 00:15:34,950 --> 00:15:36,853 And so that's null see what happens. 282 00:15:39,100 --> 00:15:42,790 So now clicking outside, nothing happens. 283 00:15:42,790 --> 00:15:44,930 Of course, we still get to the null here 284 00:15:44,930 --> 00:15:46,010 but no error occurs 285 00:15:47,610 --> 00:15:51,270 because null JavaScript is no longer trying to execute 286 00:15:51,270 --> 00:15:54,773 this line of code here, okay? 287 00:15:56,710 --> 00:15:58,566 But now let's actually take care 288 00:15:58,566 --> 00:16:03,040 of basically putting all of these other buttons down 289 00:16:03,040 --> 00:16:04,370 as I was saying. 290 00:16:04,370 --> 00:16:06,130 So when I click one of them, 291 00:16:06,130 --> 00:16:08,640 then the other ones show to move down. 292 00:16:08,640 --> 00:16:13,640 So basically we should remove this class from them, right? 293 00:16:13,800 --> 00:16:15,410 And so the solution to that 294 00:16:15,410 --> 00:16:19,020 is before we add this class here to anyone, 295 00:16:19,020 --> 00:16:22,223 we will simply remove it on all of the tabs. 296 00:16:23,290 --> 00:16:25,142 So we removed them on all. 297 00:16:25,142 --> 00:16:27,950 So that's all the tabs.forEach. 298 00:16:32,380 --> 00:16:35,490 And so each tab I'm simply calling T here. 299 00:16:35,490 --> 00:16:40,463 And then tab.clasList.remove. 300 00:16:43,830 --> 00:16:45,503 And so now that should work, 301 00:16:46,610 --> 00:16:50,040 and yeah, it does, okay? 302 00:16:50,040 --> 00:16:53,490 So this is something that we do quite usually. 303 00:16:53,490 --> 00:16:56,950 So basically clearing the class on all of them 304 00:16:56,950 --> 00:17:00,253 and then only add it afterwards on one of them. 305 00:17:01,290 --> 00:17:06,210 So that's at a comment here, active tab. 306 00:17:06,210 --> 00:17:08,950 But now finally let's actually 307 00:17:08,950 --> 00:17:11,380 activate the content area itself 308 00:17:11,380 --> 00:17:12,990 because that's the main part 309 00:17:12,990 --> 00:17:14,690 that we're actually interested in. 310 00:17:19,140 --> 00:17:21,860 Now remember that the information about 311 00:17:21,860 --> 00:17:24,570 which content area should be displayed 312 00:17:24,570 --> 00:17:27,263 is here in this data attribute. 313 00:17:28,240 --> 00:17:29,744 So let me click again. 314 00:17:29,744 --> 00:17:33,590 And so in this case, we want the tab a number two. 315 00:17:33,590 --> 00:17:36,380 And so that's this number two is encoded here 316 00:17:36,380 --> 00:17:39,510 basically in this data attribute. 317 00:17:39,510 --> 00:17:41,060 So having the number two here 318 00:17:41,060 --> 00:17:44,580 means that we want to select the element 319 00:17:45,510 --> 00:17:50,123 which has the class of operations_content_2, okay? 320 00:17:52,670 --> 00:17:55,100 So let's do that. 321 00:17:55,100 --> 00:17:56,823 Let me grab this here. 322 00:17:57,730 --> 00:17:58,803 So the selector, 323 00:18:01,470 --> 00:18:03,670 and then let's select it. 324 00:18:03,670 --> 00:18:05,790 So document.querySelector. 325 00:18:07,260 --> 00:18:09,770 And now I'm using a template string here, 326 00:18:09,770 --> 00:18:12,470 because of course we don't want to hard code 327 00:18:12,470 --> 00:18:13,670 the number two here 328 00:18:13,670 --> 00:18:15,470 but instead we want to get that 329 00:18:15,470 --> 00:18:18,993 exactly from the data attribute that I just told you. 330 00:18:22,050 --> 00:18:24,630 So let me just show that again to you. 331 00:18:24,630 --> 00:18:26,000 Now we got an error here 332 00:18:26,930 --> 00:18:29,003 but just put something there for now. 333 00:18:30,850 --> 00:18:35,030 So it is called data tab, okay. 334 00:18:35,030 --> 00:18:37,410 And so remember all these attributes 335 00:18:37,410 --> 00:18:41,160 are in the element and then in the dataset property. 336 00:18:41,160 --> 00:18:43,180 So the element that was clicked 337 00:18:43,180 --> 00:18:47,713 is indeed stored in or variable clicked, right? 338 00:18:48,740 --> 00:18:50,550 So every time we click a button, 339 00:18:50,550 --> 00:18:53,920 that button is then stored in the clicked variable 340 00:18:53,920 --> 00:18:58,563 and then .data set.tab. 341 00:18:59,850 --> 00:19:02,300 So that's only the part after the data. 342 00:19:02,300 --> 00:19:04,463 Remember, so it's just tab. 343 00:19:05,680 --> 00:19:07,433 So in this case, it's gonna be two. 344 00:19:08,360 --> 00:19:11,920 And so we already have that now selected 345 00:19:11,920 --> 00:19:15,010 and then we want to add a special class to it. 346 00:19:15,010 --> 00:19:17,570 So that's classList.add 347 00:19:18,990 --> 00:19:21,983 and let's just check out the class that we need to add. 348 00:19:23,440 --> 00:19:25,920 So we can see that here on the first content area 349 00:19:25,920 --> 00:19:27,790 which is already active. 350 00:19:27,790 --> 00:19:31,573 And so the class here is operations content active. 351 00:19:33,330 --> 00:19:37,130 Okay, and one more time you can check out the CSS 352 00:19:37,130 --> 00:19:41,173 to figure out why actually this makes the element active. 353 00:19:42,170 --> 00:19:44,313 And we can quickly do that ourselves. 354 00:19:46,700 --> 00:19:51,700 So here it is actually the active, right? 355 00:19:53,500 --> 00:19:55,300 And so basically what this does 356 00:19:55,300 --> 00:19:57,560 is to change the display property 357 00:19:57,560 --> 00:20:00,160 to something which is not none. 358 00:20:00,160 --> 00:20:03,350 So previously without this active part, 359 00:20:03,350 --> 00:20:06,740 so just operation content makes it display none 360 00:20:06,740 --> 00:20:08,500 which basically hides it. 361 00:20:08,500 --> 00:20:12,270 But then as it becomes active, we give it display grid 362 00:20:12,270 --> 00:20:17,203 and then specify all of these properties down, all right? 363 00:20:18,990 --> 00:20:22,350 So this would actually already been working 364 00:20:22,350 --> 00:20:26,870 just to really see it as a bit better in the console also. 365 00:20:26,870 --> 00:20:31,023 Let's lock this value also to the console, okay? 366 00:20:32,530 --> 00:20:33,633 But let's see. 367 00:20:35,260 --> 00:20:38,423 And indeed it now appeared down here. 368 00:20:39,470 --> 00:20:42,390 Great, so it's no longer hidden. 369 00:20:42,390 --> 00:20:46,930 And indeed we successfully read that value here 370 00:20:46,930 --> 00:20:49,520 from the data tab, which is two. 371 00:20:49,520 --> 00:20:52,640 And the same, it's going to happen here for three. 372 00:20:52,640 --> 00:20:55,550 And so you'll see that's the content number three 373 00:20:55,550 --> 00:20:57,900 also appeared down here. 374 00:20:57,900 --> 00:21:00,740 Now of course this is not quite finished yet 375 00:21:00,740 --> 00:21:03,663 because we want the other ones to be hidden. 376 00:21:04,850 --> 00:21:08,110 So that's the whole idea of this component. 377 00:21:08,110 --> 00:21:10,690 And so basically all we need to do 378 00:21:10,690 --> 00:21:13,870 is to do the same that we did for the tabs. 379 00:21:13,870 --> 00:21:17,510 So basically removing the active class for all of them 380 00:21:17,510 --> 00:21:18,880 before then adding it 381 00:21:18,880 --> 00:21:21,820 to the one that we're interested in, all right? 382 00:21:21,820 --> 00:21:23,893 So basically just what we have here. 383 00:21:25,740 --> 00:21:28,860 So let's select all the contents 384 00:21:29,730 --> 00:21:33,320 and that we actually already have here, right? 385 00:21:33,320 --> 00:21:35,860 So tabs content is also a note list 386 00:21:35,860 --> 00:21:37,563 because of query selector all 387 00:21:37,563 --> 00:21:39,850 that we can now loop over 388 00:21:39,850 --> 00:21:43,003 and then remove that active class from all of them. 389 00:21:45,640 --> 00:21:47,020 So tabsContent.forEach 390 00:21:51,180 --> 00:21:53,433 and I'm just calling it C very short here. 391 00:21:54,570 --> 00:21:56,600 So C for content. 392 00:21:56,600 --> 00:21:58,793 So class list remove. 393 00:22:01,420 --> 00:22:04,770 And so you'll see that it's always the same idea. 394 00:22:04,770 --> 00:22:08,260 So it's all about removing and adding classes 395 00:22:08,260 --> 00:22:13,260 to manipulate the page to look just like we want, all right? 396 00:22:13,490 --> 00:22:16,290 So this comment is actually more here. 397 00:22:16,290 --> 00:22:20,030 So activate tab and here 398 00:22:21,920 --> 00:22:26,890 remove the act of classes for both the tab 399 00:22:26,890 --> 00:22:28,403 and the content areas. 400 00:22:29,580 --> 00:22:32,290 And with this actually our component 401 00:22:32,290 --> 00:22:33,590 should already be working. 402 00:22:34,810 --> 00:22:35,703 So let's see. 403 00:22:36,570 --> 00:22:41,230 And yeah, beautiful, it works great, all right. 404 00:22:44,330 --> 00:22:45,610 Let's just get rid 405 00:22:45,610 --> 00:22:48,370 of all these different console.logs here 406 00:22:49,431 --> 00:22:51,553 because we only need them for development, 407 00:22:52,430 --> 00:22:53,593 but now we're done. 408 00:22:54,510 --> 00:22:56,980 So let's just quickly recap. 409 00:22:56,980 --> 00:22:59,430 And as I just mentioned a minute ago 410 00:22:59,430 --> 00:23:02,950 the whole idea when we build components like this 411 00:23:02,950 --> 00:23:05,280 is to just add and remove classes 412 00:23:05,280 --> 00:23:09,410 as necessary to manipulate the content to our needs. 413 00:23:09,410 --> 00:23:11,520 That's actually the exact same thing 414 00:23:11,520 --> 00:23:13,610 we did with a modal window. 415 00:23:13,610 --> 00:23:17,420 So if you take a look at the code, it's a bit similar. 416 00:23:17,420 --> 00:23:20,060 So to hide and display the modal window 417 00:23:20,060 --> 00:23:23,893 all we do is to add and remove this hidden class. 418 00:23:24,860 --> 00:23:27,300 Now, in this case, it's a little bit more complex 419 00:23:27,300 --> 00:23:29,430 but the idea is always the same. 420 00:23:29,430 --> 00:23:31,170 It's to work with classes 421 00:23:31,170 --> 00:23:34,680 that have some styles for showing and hiding the classes. 422 00:23:34,680 --> 00:23:38,010 And so if you're not yet really familiar with CSS, 423 00:23:38,010 --> 00:23:41,290 it's also important that you really check out to CSS 424 00:23:41,290 --> 00:23:43,720 to build these components for yourself 425 00:23:43,720 --> 00:23:46,130 and the same goes for the HTML. 426 00:23:46,130 --> 00:23:49,940 But of course, I could not write this code here as well 427 00:23:49,940 --> 00:23:52,130 because then this tutorial would take 428 00:23:52,130 --> 00:23:55,030 like one hour instead of 15 minutes. 429 00:23:55,030 --> 00:23:58,080 But anyway, I hope that this was fun 430 00:23:58,080 --> 00:24:00,880 and that make sure to understand what we did here 431 00:24:00,880 --> 00:24:03,310 including the HTML and CSS. 432 00:24:03,310 --> 00:24:05,833 And then let's go right to the next video.