elements/standard-web-components.html at main · fusionstrings/elements · 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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Elements &ndash; Standard Web Components</title>

    <template id="template-counter">
      <style>
        div {
          font-family:
            "Gill Sans", "Gill Sans MT", Calibri, "Trebuchet MS", sans-serif;
        }
      </style>
      <div>
        <slot></slot>
      </div>
    </template>

    <template id="template-button">
      <style>
        button {
          background-color: #4caf50; /* Green */
          border: none;
          color: white;
          padding: 15px 32px;
          text-align: center;
          text-decoration: none;
          display: inline-block;
          font-size: 16px;
          margin: 4px 2px;
          cursor: pointer;
        }
      </style>
      <button type="button">
        <slot></slot>
      </button>
    </template>

    <script type="module">
      const createSignal = (value) => {
        const subscribers = new Set();
        const signal = {
          get value() {
            return value;
          },
          set value(newValue) {
            value = newValue;
            for (const subscriber of subscribers) {
              subscriber(value);
            }
          },
          subscribe(subscriber) {
            subscribers.add(subscriber);
            return () => subscribers.delete(subscriber);
          },
        };
        return signal;
      };

      const count = createSignal(0);

      class Counter extends HTMLElement {
        shadow = null;
        internals;
        counterPlaceholder = null;
        disposeEffect;
        constructor() {
          super();
          if ("attachInternals" in this) {
            this.internals = this.attachInternals();
          }
        }
        connectedCallback() {
          this.shadow = this.internals?.shadowRoot || this.shadowRoot;
          if (!this.shadow) {
            this.shadow = this.attachShadow({
              mode: "open",
            });
            const template = document.getElementById(
              "template-counter",
            );
            if (template) {
              this.shadow.appendChild(template.content.cloneNode(true));
            }
          }
          this.counterPlaceholder = this.shadow?.querySelector("div");
          if (this.counterPlaceholder) {
            // Store disposer to clean up effect on disconnect
            this.disposeEffect = count.subscribe((value) => {
              this.counterPlaceholder.textContent = `${value}`;
            });
          }
        }
        disconnectedCallback() {
          if (this.disposeEffect) {
            this.disposeEffect();
            this.disposeEffect = undefined;
          }
        }
      }

      class Button extends HTMLElement {
        shadow = null;
        internals;
        buttonEl = null;
        handleClick = () => {
          count.value++;
        };
        constructor() {
          super();
          if ("attachInternals" in this) {
            this.internals = this.attachInternals();
          }
        }
        connectedCallback() {
          this.shadow = this.internals?.shadowRoot || this.shadowRoot;
          if (!this.shadow) {
            this.shadow = this.attachShadow({
              mode: "open",
            });
            const template = document.getElementById("template-button");
            if (template) {
              this.shadow.appendChild(template.content.cloneNode(true));
            }
          }
          // Attach event listener
          this.buttonEl = this.shadow?.querySelector("button");
          if (this.buttonEl) {
            this.buttonEl.addEventListener("click", this.handleClick);
          }
        }
        disconnectedCallback() {
          if (this.buttonEl) {
            this.buttonEl.removeEventListener(
              "click",
              this.handleClick,
            );
          }
        }
      }
      customElements.define("element-counter", Counter);
      customElements.define("element-button", Button);
    </script>
  </head>
  <body>
    <h1>Standard Web Components</h1>
    <nav>
      <ul>
        <li><a href="/">Home</a></li>
        <li><a href="/preact-web-components">Preact Web Components</a></li>
      </ul>
    </nav>
    <main>
      <form onsubmit="return false;">
        <fieldset>
          <legend>Counter Form</legend>
          <p>
            Current count: <element-counter>0</element-counter>
          </p>
          <element-button>Increment</element-button>
        </fieldset>
      </form>
    </main>

    <footer>
      <h2>References</h2>
      <ul>
        <li>
          <a
            href="https://html.spec.whatwg.org/multipage/scripting.html#attr-template-shadowrootmode"
          >Declarative Shadow DOM Specs</a>
        </li>
        <li>
          <a href="https://web.dev/articles/declarative-shadow-dom"
          >Declarative Shadow DOM by Jason Miller and Mason Freed</a>
        </li>
        <li>
          <a href="https://jakelazaroff.com/words/isomorphic-web-components/"
          >Isomorphic Web Components by Jake Lazaroff</a>
        </li>
        <li>
          <a href="https://github.com/mayank99/declarative-shadow-dom"
          >Utility to get Declarative Shadow Dom work in JSX</a>
        </li>
        <li>
          <a
            href="https://www.konnorrogers.com/posts/2023/what-is-declarative-shadow-dom"
          >What is DSD</a>
        </li>
        <li>
          <a href="https://12daysofweb.dev/2024/declarative-shadow-dom/">DSD</a>
        </li>
        <li>
          <a href="https://fullystacked.net/declarative-shadow-dom/"
          >Declarative Shadow DOM and issue in React</a>
        </li>
        <li>
          <a
            href="https://blog.stackademic.com/server-rendering-web-components-in-react-869c248f1df7"
          >Declarative Shadow DOM and issue in SSR</a>
        </li>
        <li>
          <a href="https://fullystacked.net/innerhtml-alternatives/"
          >Some useful modern browser APIs for Web components</a>
        </li>
        <li>
          <a href="https://github.com/solidjs/solid/issues/1834"
          >Solid JS DSD issue</a>
        </li>
      </ul>
    </footer>
  </body>
</html>