Control Flow

Dynamic

<Dynamic> is a Solid component that allows you to render components dynamically based on data. By passing either a string representing a native HTML element or a component function to the component prop, you can render the chosen component with the remaining props you provide.

import { createSignal, Dynamic, For } from "solid-js"

const RedDiv = () => <div style="color: red">Red</div>
const GreenDiv = () => <div style="color: green">Green</div>
const BlueDiv = () => <div style="color: blue">Blue</div>

const options = {
  red: RedDiv,
  green: GreenDiv,
  blue: BlueDiv,
}

function App() {
  const [selected, setSelected] = createSignal("red")

  return (
    <>
      <select
        value={selected()}
        onInput={(e) => setSelected(e.currentTarget.value)}
      >
        <For each={Object.keys(options)}>
          {(color) => <option value={color}>{color}</option>}
        </For>
      </select>
      <Dynamic component={options[selected()]} />
    </>
  )
}

This example renders a <select> element that allows you to choose between three colors. Once a color is selected, the <Dynamic> component will render the chosen color's corresponding component or element.

<Dynamic> creates more concise code than alternative conditional rendering options. For example, the following code renders the same result as the previous example:

import { createSignal, Switch, Match, For } from "solid-js"

const RedDiv = () => <div style="color: red">Red</div>
const GreenDiv = () => <div style="color: green">Green</div>
const BlueDiv = () => <div style="color: blue">Blue</div>

const options = {
  red: RedDiv,
  green: GreenDiv,
  blue: BlueDiv,
}

function App() {
  const [selected, setSelected] = createSignal("red")

  return (
    <>
      <select
        value={selected()}
        onInput={(e) => setSelected(e.currentTarget.value)}
      >
        <For each={Object.keys(options)}>
          {(color) => <option value={color}>{color}</option>}
        </For>
      </select>
      <Switch fallback={<BlueDiv />}>
        <Match when={selected() === "red"}>
          <RedDiv />
        </Match>
        <Match when={selected() === "green"}>
          <GreenDiv />
        </Match>
      </Switch>
    </>
  )
}

Instead of a more verbose <Switch> and <Match> statement, <Dynamic> offers a more concise way to render components dynamically.

Props

When working with these components, you can pass props to the component you are rendering by passing them to the <Dynamic> component. This makes them available to the component you are rendering, similar to how you would pass props to components in JSX.

import { Dynamic } from "solid-js"

function App() {
  return (
    <Dynamic component={someComponent} someProp="someValue" />
  )
}

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