My-HTML-CSS-JAVASCRIPT-Mini-Projects/IntersectionObserver1.html at main · KalamPinjar/My-HTML-CSS-JAVASCRIPT-Mini-Projects · GitHub

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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            box-sizing: border-box;
        }

        .card-container {
            display: flex;
            flex-direction: column;
            align-items: self-start;
            gap: 1rem;
        }

        .card {
            background: white;
            border: 1px solid black;
            padding: .5rem;
            border-radius: .25rem;
            font-size: 1.5em;
            transform: translateX(100px);
            opacity: 0;
            transition: 150ms;

        }

        .card.show {
            transform: translateX(0);
            opacity: 1;
        }

    </style>
</head>

<body>
    <div class="card-container">
        <div class=" card">This is the First Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is a Card</div>
        <div class="card">This is the Last Card</div>
    </div>

    <script>
        const cards = document.querySelectorAll(".card")

        const observer = new IntersectionObserver(
            entries => {
                entries.forEach(entry => {
                    entry.target.classList.toggle("show", entry.isIntersecting)
                    // if you dont want your entries to be animated again and again after once animated the uncomment below code
                    // if(entry.isIntersecting) observer.unobserve(entry.target)


                })
            }, {
            threshold: 1,
            // rootMargin:"-100px"
        }
        )

        // cards.forEach(card => {
        //     observer.observe(card)
        // })
        const lastCardObserver = new IntersectionObserver(
            entries => {
                const lastCard = entries[0]
                if (!lastCard.isIntersecting) return
                loadNewCards()
                lastCardObserver.unobserve(lastCard.target)
                lastCardObserver.observe(document.querySelector(".card:last-child"))
            },
            { rootMargin: "100px" }
        )

        lastCardObserver.observe(document.querySelector(".card:last-child"))


        cards.forEach(card => {
            observer.observe(card)
        })

        const cardContainer = document.querySelector(".card-container")
        function loadNewCards() {
            const card = document.createElement("div")
            card.textContent = "This is a Card"
            card.classList.add("card")
            observer.observe(card)
            cardContainer.appendChild(card)
        }

    </script>
</body>

</html>