1 00:00:00,780 --> 00:00:06,510 All right so in the last video we looked it at event listener and we also took a look at the event object 2 00:00:06,520 --> 00:00:09,370 in some of the things that offers. 3 00:00:09,450 --> 00:00:12,240 Now what I want to do is look at certain mouse events. 4 00:00:12,250 --> 00:00:16,940 OK so we'll look at most events in this lecture and then in the next one we'll look at keyboard and 5 00:00:16,940 --> 00:00:18,350 input events. 6 00:00:18,360 --> 00:00:23,670 So first thing I want to do here is just create a couple of variables that point to selectors So let's 7 00:00:23,670 --> 00:00:25,030 get the clear button. 8 00:00:25,320 --> 00:00:34,320 So I'm going to call this variable clear beat and then set it to document Daut queries selector and 9 00:00:34,320 --> 00:00:39,820 it has a class of clear dash tasks. 10 00:00:39,840 --> 00:00:40,200 All right. 11 00:00:40,210 --> 00:00:42,940 Another thing I want to grab is the card. 12 00:00:43,170 --> 00:00:47,270 OK so the card is the entire thing. 13 00:00:47,610 --> 00:00:54,220 Everything that's within this border you can see has a class of card which is right here. 14 00:00:54,300 --> 00:00:57,180 So I'm going to say document Daut 15 00:01:00,720 --> 00:01:06,090 query selector and reward the class of card. 16 00:01:06,450 --> 00:01:06,840 OK. 17 00:01:06,850 --> 00:01:12,060 And the last thing I want is just this heading right here this task heading which is an H5. 18 00:01:12,360 --> 00:01:16,260 So I'm going to say Konst call this heading. 19 00:01:16,400 --> 00:01:25,140 Set it to document dot query selector and I will just grab it by its tag which is h 5. 20 00:01:25,140 --> 00:01:25,430 All right. 21 00:01:25,440 --> 00:01:29,040 So there's just a couple of things I want to do with these different elements. 22 00:01:29,280 --> 00:01:33,510 So let's create an event handler so 23 00:01:36,300 --> 00:01:37,610 we're going to create a function. 24 00:01:37,620 --> 00:01:41,740 And I'm just going to call this a run event. 25 00:01:42,420 --> 00:01:42,910 OK. 26 00:01:42,930 --> 00:01:47,800 And this run event is going to just take in the event object so. 27 00:01:48,330 --> 00:01:51,600 And then I want to just console log. 28 00:01:52,920 --> 00:02:00,330 I'll throw some template strings in here so some back ticks and I'm going to say event put this in caps 29 00:02:00,530 --> 00:02:08,100 will say event type and then remember we can grab these variable here or we can grab from the event 30 00:02:08,130 --> 00:02:09,900 object the type. 31 00:02:10,400 --> 00:02:17,190 OK so now I'm going to just use I'm going to do a click which we've already looked at but I'm going 32 00:02:17,190 --> 00:02:22,900 to put it in here anyway so click between dot and event listener. 33 00:02:23,400 --> 00:02:25,480 And we want to listen for a click. 34 00:02:25,710 --> 00:02:29,520 And when that click happens we're going to call run event. 35 00:02:30,010 --> 00:02:30,410 OK. 36 00:02:30,420 --> 00:02:32,340 So what do you think is going to happen here. 37 00:02:32,340 --> 00:02:35,580 I'm sure that you can figure this out it's pretty easy. 38 00:02:35,580 --> 00:02:40,600 So if I go ahead and click we're going to get event type and click. 39 00:02:40,620 --> 00:02:40,950 All right. 40 00:02:40,950 --> 00:02:47,260 So I just want to look at some of the other mouse events we also have a double click. 41 00:02:47,280 --> 00:02:57,090 So let's go ahead and take that clear button and let's add an event listener now for double click it's 42 00:02:57,090 --> 00:03:04,320 going to be DBIL click OK and then we'll just call run event and save. 43 00:03:04,320 --> 00:03:10,740 So now if we double click you'll see we get event type double click and I'm just going to comment these 44 00:03:11,250 --> 00:03:16,140 out as we go so that all that so that they don't keep adding up here. 45 00:03:16,290 --> 00:03:18,170 I just want to see the current event. 46 00:03:18,480 --> 00:03:22,410 So the next one is going to be most down. 47 00:03:22,410 --> 00:03:26,760 So I can actually just copy this. 48 00:03:27,000 --> 00:03:31,140 So we'll change just to mouse down and save. 49 00:03:31,170 --> 00:03:37,110 And now if I go and I just click and hold that's what fires off most down. 50 00:03:37,110 --> 00:03:39,660 All right click hold. 51 00:03:39,660 --> 00:03:41,240 I haven't let go of the mouse. 52 00:03:41,250 --> 00:03:43,780 That is the event mouse down. 53 00:03:43,810 --> 00:03:44,240 All right. 54 00:03:44,250 --> 00:03:49,890 And then at the same time we have mouse up which you can probably guess what it does it does the exact 55 00:03:49,890 --> 00:03:51,020 opposite. 56 00:03:51,060 --> 00:03:52,710 So it's common. 57 00:03:52,740 --> 00:03:57,510 So let's change this to mouse up and save. 58 00:03:57,510 --> 00:03:59,240 And now I'm going to click and hold. 59 00:03:59,370 --> 00:04:01,110 Notice that nothing has happened. 60 00:04:01,140 --> 00:04:04,820 When I let go that's when that event fires off. 61 00:04:04,830 --> 00:04:05,320 All right. 62 00:04:05,370 --> 00:04:11,150 Most down mouse up another event we have is mouse enter 63 00:04:15,520 --> 00:04:22,370 So let's go ahead and paste that in and let's do mouse enter. 64 00:04:24,740 --> 00:04:32,250 And save and you see that I'm just going to just drag into the button and there it is mouse enter. 65 00:04:32,310 --> 00:04:36,950 Actually no I'm going to put this on the card and not the button. 66 00:04:37,170 --> 00:04:40,300 So if I go into the card B get mouse enter. 67 00:04:40,320 --> 00:04:45,510 Now we also have mouse leave which is basically the opposite of that. 68 00:04:45,550 --> 00:04:49,110 So and the pace is soon in the same mouse we've 69 00:04:54,080 --> 00:05:00,040 And I'm going to keep going to keep mouse enter active as well so if we enter mouse enter if we go outside 70 00:05:00,040 --> 00:05:05,470 of the card because that's not working it's because I spelt this wrong. 71 00:05:05,830 --> 00:05:10,230 So we go in mouse enter we leave the card we get mouse leave. 72 00:05:10,390 --> 00:05:10,720 All right. 73 00:05:10,720 --> 00:05:18,640 Now in addition to mouse enter and mouse leave we have two other similar events which are mouse over 74 00:05:18,640 --> 00:05:20,310 and mouse out. 75 00:05:20,950 --> 00:05:23,790 So let's go ahead and change this to over 76 00:05:27,350 --> 00:05:29,350 and out. 77 00:05:29,360 --> 00:05:29,770 All right. 78 00:05:29,780 --> 00:05:37,640 So if I go in I just hover over the card you'll see we get mouse over and mouse enter. 79 00:05:37,820 --> 00:05:41,020 If I leave we get mouse out and mouse leaves. 80 00:05:41,020 --> 00:05:43,630 So what's the difference between these two. 81 00:05:43,940 --> 00:05:51,510 Well the difference is you'll see that if I go in and then I go over something else another element 82 00:05:51,540 --> 00:05:55,060 inside the card such as Clear tasks. 83 00:05:55,440 --> 00:06:02,850 You can see that we got mouse over and if I leave that we get mouse oh ok mouse over mouse out but Mouse 84 00:06:02,910 --> 00:06:07,360 enter and most leave are not firing off those only fire off when we go into that. 85 00:06:07,390 --> 00:06:14,910 The main element however mouse out and mouse over will fire off when you go into another element that's 86 00:06:14,910 --> 00:06:16,950 inside of that element. 87 00:06:16,950 --> 00:06:17,330 All right. 88 00:06:17,340 --> 00:06:18,490 Hopefully that makes sense. 89 00:06:18,500 --> 00:06:26,480 So whether it's this button or whether it's this list right here a list item mouse most out most overs 90 00:06:26,490 --> 00:06:28,070 going to keep on firing. 91 00:06:28,140 --> 00:06:28,760 OK. 92 00:06:29,010 --> 00:06:33,950 But mostly even mouse enter is only going to fire on the initial parent element. 93 00:06:33,960 --> 00:06:36,260 So that's the difference between these. 94 00:06:36,810 --> 00:06:38,750 All right so I'm going to comment those out 95 00:06:41,840 --> 00:06:43,010 OK. 96 00:06:43,350 --> 00:06:49,350 So the next thing I want to look at is mouse move. 97 00:06:49,350 --> 00:06:55,800 So it's go ahead and say let's put this on the card as well. 98 00:06:56,010 --> 00:06:58,850 So Sekhar dot our event listener 99 00:07:04,100 --> 00:07:08,150 most move you know we want to call run event. 100 00:07:08,840 --> 00:07:09,190 OK. 101 00:07:09,200 --> 00:07:11,500 So mouse move if I go in. 102 00:07:11,660 --> 00:07:14,690 It's just any movement inside of that element. 103 00:07:14,720 --> 00:07:15,160 OK. 104 00:07:15,160 --> 00:07:16,710 Anywhere in this card. 105 00:07:16,820 --> 00:07:21,770 If I move my mouse is firing that event off if I go outside and move it doesn't matter it's not going 106 00:07:21,770 --> 00:07:24,640 to fire it off it's just inside that element. 107 00:07:24,650 --> 00:07:24,980 All right. 108 00:07:24,980 --> 00:07:30,890 And you can use this for some really cool stuff when it comes to games things that are really really 109 00:07:30,890 --> 00:07:32,350 interactive. 110 00:07:32,360 --> 00:07:40,010 So what I want to do here is I'm going to make this heading I want this to display the coordinates of 111 00:07:40,010 --> 00:07:41,780 my mouse. 112 00:07:41,850 --> 00:07:48,680 You saw that we could access the E dot offset X and offset Y which gives us the coordinates of the mouse 113 00:07:48,680 --> 00:07:50,050 inside the element. 114 00:07:50,060 --> 00:07:54,500 So as this moves I want those elements to show up right here. 115 00:07:54,800 --> 00:08:02,500 I think it's a cool little exercise so we're going to take the headings because up here we we define 116 00:08:02,510 --> 00:08:11,900 heading as that age H5 right here and then we're going to say dog Bynner aged him now which just allows 117 00:08:11,900 --> 00:08:19,210 us to insert age T.M. into this element and then put in some actually we're going to put in our back 118 00:08:19,210 --> 00:08:25,010 ticks here and we're going to say I was put in an H5 119 00:08:29,700 --> 00:08:38,310 and then we'll do much I guess we could do text content since we're just going to keep it as an age 120 00:08:38,310 --> 00:08:38,640 5. 121 00:08:38,630 --> 00:08:46,440 There's really no sense in doing that but let's do most X and then we'll put in our variable that which 122 00:08:46,440 --> 00:09:02,610 will be e dot offset X Y and then we'll do mouse Y and we'll set this to the DOT offset y. 123 00:09:02,920 --> 00:09:08,050 OK so let's go ahead and save that and then let's go in and move our mouse around and you can see that 124 00:09:08,050 --> 00:09:13,850 the values are going to output in that age 5 which is kind of cool. 125 00:09:13,870 --> 00:09:14,220 All right. 126 00:09:14,220 --> 00:09:19,260 And like I said if you're building a game where you're controlling some kind of character with your 127 00:09:19,260 --> 00:09:26,420 mouse This is what you're going to use so that you know exactly where your character is in the game. 128 00:09:26,460 --> 00:09:26,790 All right. 129 00:09:26,790 --> 00:09:34,740 Another cool thing we could do is we can say document Daut body let's just get the body and we're going 130 00:09:34,740 --> 00:09:37,140 to say Daut style Daut 131 00:09:39,450 --> 00:09:47,160 background color and we're going to set that to a set of tactics. 132 00:09:47,160 --> 00:09:52,950 Now in CSSA you can change you can and you can make a color just you know standard color like red or 133 00:09:52,950 --> 00:10:00,420 blue or you can use a hexadecimal value or you can use an R.G. value which is red green blue and basically 134 00:10:00,420 --> 00:10:02,280 that takes three parameters. 135 00:10:02,280 --> 00:10:05,520 The first is going to be red second green third blue. 136 00:10:05,640 --> 00:10:11,130 And each one can be a value from 0 to 255. 137 00:10:11,130 --> 00:10:16,440 All right and then you get different different variations depending on those numbers. 138 00:10:16,440 --> 00:10:23,010 Now what I want to do is I want to take these two this these two offsets here from the event object 139 00:10:23,100 --> 00:10:26,040 and use those as parameters for red. 140 00:10:26,040 --> 00:10:36,090 We're going to use the x coordinate of the mouse and then for Green we'll use the Y and then for blue. 141 00:10:36,240 --> 00:10:38,250 We're just going to say 40. 142 00:10:38,250 --> 00:10:38,600 All right. 143 00:10:38,610 --> 00:10:44,070 So let's go ahead and save that and let's go in and start moving this around and you see that the background 144 00:10:44,070 --> 00:10:46,240 color just changes color. 145 00:10:46,430 --> 00:10:48,060 All right which is kind of cool. 146 00:10:48,180 --> 00:10:54,870 And I think gives you a good example of the different weird things you can do with this event with a 147 00:10:54,860 --> 00:10:56,130 mouse move. 148 00:10:56,640 --> 00:11:01,200 So that's going to be it for mouse events in the next video I want to get into events that have to do 149 00:11:01,200 --> 00:11:03,060 with forms in input.