前端切图学习-多喝 (热) 水

Drink Water

Posted by R1NG on September 2, 2021 Viewed Times

多喝 (热) Drink Water

1. 概述

项目本体为一个记录用户饮水量的小工具, 用户可点选自己今日饮用了多少瓶 $250\text{ml}$ 的水来检测自己今日饮水量是否达标.

效果: 20210904202956


2. 结构和切图

网页的基本结构如下:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
<body>
    <h1>Drink Water</h1>
    <h2>Goal: 2 Liters</h2>

    <div class="cup">
        <div class="remained" id="remained">
            <span id="liters"></span>
            <small>Remained</small>
        </div>

        <div class="percentage" id="percentage"></div>
    </div>
    <p class="text">Select how many glasses of water that you have drank</p>

    <div class="cups">
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
        <div class="cup cup-small">250 ml</div>
    </div>
</body>

结构非常简单.


3. 编写 CSS 样式

首先定义两个 CSS 变量: 主体色和背景色.

1
2
3
4
:root {
    --border-color: #144fc6;
    --fill-color: #6ab3f8;
}

下面继续定义 body 排版方式和数个层级的标题样式:

1
2
3
4
5
6
7
h1 {
    margin: 10px 0 0;
}
h3 {
    font-weight: 400;
    margin: 10px 0;
}

下面定义大杯和小杯的样式:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
.cup {
    background-color: #fff;
    border: 4px solid var(--border-color);
    color: var(--border-color);
    border-radius: 0 0 40px 40px;
    height: 330px;
    width: 150px;
    margin: 30px 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.cup.cup-small {
    height: 95px;
    width: 50px;
    border-radius: 0 0 15px 15px;
    background-color: rgba(255, 255, 255, .9);
    cursor: pointer;
    font-size: 14px;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin: 5px;
    transition: .3s ease;
}
.cup.cup-small.full {
    background-color: var(--fill-color);
    color: #fff;
}
.cups {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    width: 280px;
}

然后处理位于大杯中心的, 剩余水量提示文字的样式:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
.remained {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    flex: 1;
    transition: .3s ease;
}
.remained span {
    font-size: 20px;
    font-weight: bold;
}
.remained small {
    font-size: 12px;
}

再处理大杯中根据剩余容量数据填充杯体的填充样式:

1
2
3
4
5
6
7
8
9
10
.percentage {
    background-color: var(--fill-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-weight: 30px;
    height: 0;
    transition: .3s ease;
}

最后处理最小的静态提示文字的样式:

1
2
3
4
.text {
    text-align: center;
    margin: 0 0 5px;
}

完整的 CSS 样式如下:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
:root {
    --border-color: #144fc6;
    --fill-color: #6ab3f8;
}

* {
    box-sizing: border-box;
}
body {
    background-color: #3494e4;
    color: #fff;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 40px;
}

h1 {
    margin: 10px 0 0;
}
h3 {
    font-weight: 400;
    margin: 10px 0;
}

.cup {
    background-color: #fff;
    border: 4px solid var(--border-color);
    color: var(--border-color);
    border-radius: 0 0 40px 40px;
    height: 330px;
    width: 150px;
    margin: 30px 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.cup.cup-small {
    height: 95px;
    width: 50px;
    border-radius: 0 0 15px 15px;
    background-color: rgba(255, 255, 255, .9);
    cursor: pointer;
    font-size: 14px;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin: 5px;
    transition: .3s ease;
}
.cup.cup-small.full {
    background-color: var(--fill-color);
    color: #fff;
}
.cups {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    width: 280px;
}

.remained {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    flex: 1;
    transition: .3s ease;
}
.remained span {
    font-size: 20px;
    font-weight: bold;
}
.remained small {
    font-size: 12px;
}

.percentage {
    background-color: var(--fill-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-weight: 30px;
    height: 0;
    transition: .3s ease;
}
.text {
    text-align: center;
    margin: 0 0 5px;
}


4. JavaScript

下面编写 JavaScript 函数:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
// select corresponding elements
const smallCups = document.querySelectorAll('.cup-small');
const liters = document.getElementById('liters');
const percentage = document.getElementById('percentage');
const remained = document.getElementById('remained');

// initialize
updateBigCup();

// listen to click events
smallCups.forEach((cup, idx) => {
    // highlight the corresponding cup when clicked it 
    cup.addEventListener('click', () => highlightCups(idx))
})

function highlightCups(idx) {
    if (idx === 7 && smallCups[idx].classList.contains("full")) {
        idx--;
    } else if (smallCups[idx].classList.contains('full') && !smallCups[idx].nextElementSibling.classList.contains('full')) {
        idx--;
    }

    smallCups.forEach((cup, idx2) => {
        if (idx2 <= idx) {
            cup.classList.add('full');
        } else {
            cup.classList.remove('full');
        }
    })
    updateBigCup();
}

function updateBigCup() {
    const fullCups = document.querySelectorAll('.cup-small.full').length;
    const totalCups = smallCups.length;

    if (fullCups === 0) {
        percentage.style.visibility = 'hidden';
        percentage.style.height = 0;
    } else {
        percentage.style.visibility = 'visible';
        percentage.style.height = `${fullCups / totalCups * 330}px`;
        percentage.innerText = `${fullCups / totalCups * 100}%`
    }

    if (fullCups == totalCups) {
        remained.style.visibility = 'hidden';
        remained.style.height = 0;
    } else {
        remained.style.visibility = 'visible';
        liters.innerText = `${2-(250 * fullCups / 1000)}L`;
    }
}

最后, 完整的网页演示可见 此处