質問編集履歴
2
修正
test
CHANGED
|
@@ -1 +1 @@
|
|
|
1
|
-
背景画像がランダムで表示させるスライドショーを作りたい
|
|
1
|
+
css,javascriptを使い、背景画像がランダムで表示させるスライドショーを作りたい
|
test
CHANGED
|
File without changes
|
1
修正
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -1,85 +1,116 @@
|
|
|
1
1
|
### 前提
|
|
2
2
|
|
|
3
3
|
rails で投稿アプリを作っています。
|
|
4
|
-
背景画像がラ
|
|
4
|
+
背景画像がスライドショーのように流れるように設定したいのですが、
|
|
5
|
-
|
|
5
|
+
画像が表示されません。
|
|
6
6
|
画像はapp/assets/imagesに保存しています。
|
|
7
7
|
|
|
8
|
-
https://
|
|
8
|
+
https://yukipan-world.com/web-tips/568/#i-2
|
|
9
|
-
このサイトの
|
|
9
|
+
このサイトの画像の上にテキストを表示させたい場合を参照しています。
|
|
10
10
|
|
|
11
|
+
また、背景画像をランダムに流すには
|
|
11
|
-
javascript
|
|
12
|
+
javascriptにどのような記述を行えばいいのでしょうか
|
|
12
|
-
|
|
13
|
+
|
|
13
14
|
|
|
14
15
|
|
|
15
16
|
|
|
16
17
|
### 該当のソースコード
|
|
17
18
|
|
|
18
19
|
```
|
|
19
|
-
application/js
|
|
20
|
-
|
|
21
|
-
// This file is automatically compiled by Webpack, along with any other files
|
|
22
|
-
// present in this directory. You're encouraged to place your actual application logic in
|
|
23
|
-
// a relevant structure within app/javascript and only use these pack files to reference
|
|
24
|
-
// that code so it'll be compiled.
|
|
25
|
-
|
|
26
|
-
import Rails from "@rails/ujs"
|
|
27
|
-
import Turbolinks from "turbolinks"
|
|
28
|
-
import * as ActiveStorage from "@rails/activestorage"
|
|
29
|
-
import "channels"
|
|
30
|
-
import "script.js"
|
|
31
|
-
import 'jquery'
|
|
32
|
-
import "bootstrap";
|
|
33
|
-
import "../stylesheets/application";
|
|
34
|
-
|
|
35
|
-
Rails.start()
|
|
36
|
-
Turbolinks.start()
|
|
37
|
-
ActiveStorage.start()
|
|
38
|
-
|
|
39
|
-
const assets_src = ["assets/1.jpg","assets/2.jpg","assets/first-back.jpg"];
|
|
40
|
-
let num = -1;
|
|
41
|
-
|
|
42
|
-
|
|
43
|
-
function slideshow_timer(){
|
|
44
|
-
|
|
45
|
-
num = Math.floor(Math.random()*assets_src.length);
|
|
46
|
-
|
|
47
|
-
document.getElementById("mypic").src = assets_src[num];
|
|
48
|
-
|
|
49
|
-
}
|
|
50
|
-
|
|
51
|
-
setInterval(slideshow_timer,1000);
|
|
52
|
-
```
|
|
53
|
-
```
|
|
54
20
|
application/html
|
|
55
21
|
|
|
56
22
|
<body>
|
|
23
|
+
<div class="slideBox">
|
|
24
|
+
<p class="title">cssのみでつくったスライド</p>
|
|
25
|
+
<div class="item2" style="background-image: url(./assets/images/1.jpg)"></div>
|
|
26
|
+
<div class="item2" style="background-image: url(./assets/images/2.jpg)"></div>
|
|
27
|
+
<div class="item2" style="background-image: url(./assets/images/first-back.jpg)"></div>
|
|
57
|
-
|
|
28
|
+
</body>
|
|
58
|
-
|
|
59
|
-
|
|
60
29
|
|
|
61
|
-
<div class="header-list">
|
|
62
|
-
|
|
30
|
+
```
|
|
63
|
-
<% if user_signed_in? %>
|
|
64
|
-
<li class="button"><%= link_to "投稿する", new_post_path %></li>
|
|
65
|
-
<li class="button"><%= link_to "投稿一覧", posts_path %></li>
|
|
66
|
-
<li class="button"><%= link_to "ランキング", post_rank_path %></li>
|
|
67
|
-
<li class="button"><%= link_to "マイページへ", user_path(current_user.id) %></li>
|
|
68
|
-
<li class="button"><%= link_to "ログアウト", destroy_user_session_path, method: :delete %></li>
|
|
69
|
-
<% else %>
|
|
70
|
-
<li class="button"><%= link_to "投稿一覧", posts_path %></li>
|
|
71
|
-
<li class="button"><%= link_to "ランキング", post_rank_path %></li>
|
|
72
|
-
<li class="button"><%= link_to "ログイン", new_user_session_path %></li>
|
|
73
|
-
<li class="button"><%= link_to "アカウント作成", new_user_registration_path %></li>
|
|
74
|
-
|
|
31
|
+
```
|
|
75
|
-
|
|
32
|
+
application/scss
|
|
76
|
-
</div>
|
|
77
|
-
|
|
78
|
-
</header>
|
|
79
|
-
<%= yield %>
|
|
80
|
-
<img id="mypic" width="400" height="300">
|
|
81
|
-
</body>
|
|
82
33
|
|
|
34
|
+
.slideBox {
|
|
35
|
+
height: 500px;
|
|
36
|
+
overflow: hidden;
|
|
37
|
+
position: relative;
|
|
38
|
+
}
|
|
39
|
+
|
|
40
|
+
|
|
41
|
+
.title {
|
|
42
|
+
font-size: 32px;
|
|
43
|
+
color: #fff;
|
|
44
|
+
z-index: 11;
|
|
45
|
+
position: absolute;
|
|
46
|
+
top: 50%;
|
|
47
|
+
left: 50%;
|
|
48
|
+
transform: translate(-50%,-50%);
|
|
49
|
+
}
|
|
50
|
+
|
|
51
|
+
.item2 {
|
|
52
|
+
z-index: 10;
|
|
53
|
+
opacity: 0;
|
|
54
|
+
width: 100%;
|
|
55
|
+
height: 500px;
|
|
56
|
+
background-position: center center;
|
|
57
|
+
background-repeat: no-repeat;
|
|
58
|
+
background-size: cover;
|
|
59
|
+
position: absolute;
|
|
60
|
+
left: 0;
|
|
61
|
+
top: 0;
|
|
62
|
+
-webkit-animation: anime 30s 0s infinite;
|
|
63
|
+
animation: anime 30s 0s infinite;
|
|
64
|
+
}
|
|
65
|
+
|
|
66
|
+
.item2:nth-of-type(2) {
|
|
67
|
+
-webkit-animation-delay: 10s;
|
|
68
|
+
animation-delay: 10s;
|
|
69
|
+
}
|
|
70
|
+
|
|
71
|
+
.item2:nth-of-type(3) {
|
|
72
|
+
-webkit-animation-delay: 20s;
|
|
73
|
+
animation-delay: 20s;
|
|
74
|
+
}
|
|
75
|
+
|
|
76
|
+
|
|
77
|
+
@keyframes anime {
|
|
78
|
+
0% {
|
|
79
|
+
opacity: 0;
|
|
80
|
+
}
|
|
81
|
+
30% {
|
|
82
|
+
opacity: 1;
|
|
83
|
+
}
|
|
84
|
+
35% {
|
|
85
|
+
opacity: 1;
|
|
86
|
+
}
|
|
87
|
+
50% {
|
|
88
|
+
opacity: 0;
|
|
89
|
+
z-index: 9;
|
|
90
|
+
}
|
|
91
|
+
100% {
|
|
92
|
+
opacity: 0;
|
|
93
|
+
}
|
|
94
|
+
}
|
|
95
|
+
|
|
96
|
+
@-webkit-keyframes anime {
|
|
97
|
+
0% {
|
|
98
|
+
opacity: 0;
|
|
99
|
+
}
|
|
100
|
+
30% {
|
|
101
|
+
opacity: 1;
|
|
102
|
+
}
|
|
103
|
+
35% {
|
|
104
|
+
opacity: 1;
|
|
105
|
+
}
|
|
106
|
+
50% {
|
|
107
|
+
opacity: 0;
|
|
108
|
+
z-index: 9;
|
|
109
|
+
}
|
|
110
|
+
100% {
|
|
111
|
+
opacity: 0;
|
|
112
|
+
}
|
|
113
|
+
}
|
|
83
114
|
```
|
|
84
115
|
```
|
|
85
116
|
```
|