{"id":8680,"date":"2025-03-19T22:12:23","date_gmt":"2025-03-19T16:42:23","guid":{"rendered":"https:\/\/pheonixsolutions.com\/blog\/?p=8680"},"modified":"2025-03-19T22:12:27","modified_gmt":"2025-03-19T16:42:27","slug":"slots-in-javascript","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/slots-in-javascript\/","title":{"rendered":"Slots in Javascript"},"content":{"rendered":"\n

Introduction:<\/em><\/strong><\/p>\n\n\n\n

In JavaScript, we can create reusable web components, which is a key feature that allows us to avoid repeating code. A crucial aspect of web components is the use of slots, which help manage the content displayed within templates.<\/p>\n\n\n\n

What are slots?<\/em><\/strong><\/p>\n\n\n\n

Slots are placeholders within a shadow DOM, where you can insert the desired HTML content. They enhance the reusability and flexibility of web components, allowing for dynamic content insertion.<\/p>\n\n\n\n

To define a slot we use <slot><\/slot>. The content is placed between the tags, allowing us to inject external content and dynamically render it within the component.<\/p>\n\n\n\n

Example: <slot>Default Content<\/slot><\/code><\/p>\n\n\n\n

Named Slots:<\/em><\/strong><\/p>\n\n\n\n

To define multiple slots, we can assign unique names to each one for differentiation.<\/p>\n\n\n\n

Example: <\/p>\n\n\n\n

<slot name=”header”>Default Header Content<\/slot><\/p>\n\n\n\n

<slot name=”footer”>Default Footer Content<\/slot><\/p>\n\n\n\n

I am defining the template with slots.<\/p>\n\n\n\n

 <template id=”user-card-template”><\/p>\n\n\n\n

    <style><\/p>\n\n\n\n

      .card {<\/p>\n\n\n\n

        border: 1px solid #ccc;<\/p>\n\n\n\n

        max-width: 400px;<\/p>\n\n\n\n

      }<\/p>\n\n\n\n

      .header {<\/p>\n\n\n\n

        color: red;<\/p>\n\n\n\n

      }<\/p>\n\n\n\n

      .footer {<\/p>\n\n\n\n

        color: green;<\/p>\n\n\n\n

      }<\/p>\n\n\n\n

    <\/style><\/p>\n\n\n\n

    <div class=”card”><\/p>\n\n\n\n

      <div class=”header”><slot name=”header”>Default Header Content<\/slot><\/div><\/p>\n\n\n\n

      <div class=”footer”><slot name=”footer”>Default Footer Content<\/slot><\/div><\/p>\n\n\n\n

    <\/div><\/p>\n\n\n\n

\u00a0 <\/template>
<script><\/p>\n\n\n\n

      class UserCard extends HTMLElement {<\/p>\n\n\n\n

        constructor() {<\/p>\n\n\n\n

          super();<\/p>\n\n\n\n

          const template = document.getElementById(“user-card-template”);<\/p>\n\n\n\n

          const shadowRoot = this.attachShadow({ mode: “open” });<\/p>\n\n\n\n

          shadowRoot.appendChild(template.content.cloneNode(true));<\/p>\n\n\n\n

        }<\/p>\n\n\n\n

      }<\/p>\n\n\n\n

      customElements.define(“user-card”, UserCard);<\/p>\n\n\n\n

    <\/script><\/p>\n\n\n\n

    <user-card><\/p>\n\n\n\n

        <h2 slot=”header”>Name: John<\/h2><\/p>\n\n\n\n

        <div slot=”footer”>Footer<\/div><\/p>\n\n\n\n

    <\/user-card><\/p>\n\n\n\n

    <user-card><\/p>\n\n\n\n

        <h2 slot=”header”>Name: Jim<\/h2><\/p>\n\n\n\n

        <div slot=”footer”>Footer2 content<\/div><\/p>\n\n\n\n

\u00a0 \u00a0 <\/user-card>
Output:<\/em><\/strong>
<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

Here two cards are loaded with dynamic contents.<\/p>\n\n\n\n

Conclusion:<\/em><\/strong>
Slots are very important feature in web components which offer flexibility and control over the content distribution. By using default, named slots we can create a powerful and reusable web components.<\/p>\n","protected":false},"excerpt":{"rendered":"

Introduction: In JavaScript, we can create reusable web components, which is a key feature that allows us to avoid repeating code. A crucial aspect of web components is the use of slots, which help manage the content displayed within templates. What are slots? 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