carbon-components-svelte/src/NumberInput/NumberInput.svelte

<script>
  /**
   * @typedef {"increment" | "decrement"} NumberInputTranslationId
   * @event {null | number} change
   * @event {null | number} input
   */

  /**
   * Set the size of the input
   * @type {"sm" | "xl"}
   */
  export let size = undefined;

  /**
   * Specify the input value.
   * Use `null` to denote "no value"
   * @type {null | number}
   */
  export let value = null;

  /** Specify the step increment */
  export let step = 1;

  /**
   * Specify the maximum value
   * @type {number}
   */
  export let max = undefined;

  /**
   * Specify the minimum value
   * @type {number}
   */
  export let min = undefined;

  /** Set to `true` to enable the light variant */
  export let light = false;

  /** Set to `true` for the input to be read-only */
  export let readonly = false;

  /** Set to `true` to allow for an empty value */
  export let allowEmpty = false;

  /** Set to `true` to disable the input */
  export let disabled = false;

  /** Set to `true` to hide the input stepper buttons */
  export let hideSteppers = false;

  /** Specify the ARIA label for the increment icons */
  export let iconDescription = "";

  /** Set to `true` to indicate an invalid state */
  export let invalid = false;

  /** Specify the invalid state text */
  export let invalidText = "";

  /** Set to `true` to indicate an warning state */
  export let warn = false;

  /** Specify the warning state text */
  export let warnText = "";

  /** Specify the helper text */
  export let helperText = "";

  /** Specify the label text */
  export let label = "";

  /** Set to `true` to visually hide the label text */
  export let hideLabel = false;

  /**
   * Override the default translation ids
   * @type {(id: NumberInputTranslationId) => string}
   */
  export let translateWithId = (id) => defaultTranslations[id];

  /**
   * Default translation ids
   * @type {{ increment: "increment"; decrement: "decrement" }}
   */
  export const translationIds = {
    increment: "increment",
    decrement: "decrement",
  };

  /** Set an id for the input element */
  export let id = "ccs-" + Math.random().toString(36);

  /**
   * Specify a name attribute for the input
   * @type {string}
   */
  export let name = undefined;

  /** Obtain a reference to the input HTML element */
  export let ref = null;

  import { createEventDispatcher } from "svelte";
  import Add from "../icons/Add.svelte";
  import Subtract from "../icons/Subtract.svelte";
  import WarningFilled from "../icons/WarningFilled.svelte";
  import WarningAltFilled from "../icons/WarningAltFilled.svelte";
  import EditOff from "../icons/EditOff.svelte";

  const defaultTranslations = {
    [translationIds.increment]: "Increment number",
    [translationIds.decrement]: "Decrement number",
  };

  const dispatch = createEventDispatcher();

  function updateValue(isIncrementing) {
    if (isIncrementing) {
      ref.stepUp();
    } else {
      ref.stepDown();
    }
    value = +ref.value;

    dispatch("input", value);
    dispatch("change", value);
  }

  $: incrementLabel = translateWithId("increment");
  $: decrementLabel = translateWithId("decrement");
  $: error =
    (invalid && !readonly) ||
    (!allowEmpty && value == null) ||
    value > max ||
    (typeof value === "number" && value < min);
  $: errorId = `error-${id}`;
  $: ariaLabel =
    $$props["aria-label"] ||
    "Numeric input field with increment and decrement buttons";

  function parse(raw) {
    return raw != "" ? Number(raw) : null;
  }

  function onInput({ target }) {
    value = parse(target.value);

    dispatch("input", value);
  }

  function onChange({ target }) {
    dispatch("change", parse(target.value));
  }
</script>

<!-- svelte-ignore a11y-mouse-events-have-key-events -->
<!-- svelte-ignore a11y-click-events-have-key-events -->
<!-- svelte-ignore a11y-no-static-element-interactions -->
<div
  class:bx--form-item={true}
  on:click
  on:mouseover
  on:mouseenter
  on:mouseleave
>
  <div
    data-invalid={error || undefined}
    class:bx--number={true}
    class:bx--number--helpertext={true}
    class:bx--number--readonly={readonly}
    class:bx--number--light={light}
    class:bx--number--nolabel={hideLabel}
    class:bx--number--nosteppers={hideSteppers}
    class:bx--number--sm={size === "sm"}
    class:bx--number--xl={size === "xl"}
  >
    {#if $$slots.label || label}
      <label
        for={id}
        class:bx--label={true}
        class:bx--label--disabled={disabled}
        class:bx--visually-hidden={hideLabel}
      >
        <slot name="label">{label}</slot>
      </label>
    {/if}
    <div
      class:bx--number__input-wrapper={true}
      class:bx--number__input-wrapper--warning={!invalid && warn}
    >
      <input
        bind:this={ref}
        type="number"
        pattern="[0-9]*"
        aria-describedby={errorId}
        data-invalid={error || undefined}
        aria-invalid={error || undefined}
        aria-label={label ? undefined : ariaLabel}
        {disabled}
        {id}
        {name}
        {max}
        {min}
        {step}
        value={value ?? ""}
        {readonly}
        {...$$restProps}
        on:change={onChange}
        on:input={onInput}
        on:keydown
        on:keyup
        on:focus
        on:blur
        on:paste
      />
      {#if readonly}
        <EditOff class="bx--text-input__readonly-icon" />
      {:else}
        {#if invalid}
          <WarningFilled class="bx--number__invalid" />
        {/if}
        {#if !invalid && warn}
          <WarningAltFilled
            class="bx--number__invalid bx--number__invalid--warning"
          />
        {/if}
      {/if}
      {#if !hideSteppers}
        <div class:bx--number__controls={true}>
          <button
            type="button"
            tabindex="-1"
            title={decrementLabel || iconDescription}
            aria-label={decrementLabel || iconDescription}
            class:bx--number__control-btn={true}
            class:down-icon={true}
            on:click={() => {
              updateValue(false);
            }}
            {disabled}
          >
            <Subtract class="down-icon" />
          </button>
          <div class:bx--number__rule-divider={true}></div>
          <button
            type="button"
            tabindex="-1"
            title={incrementLabel || iconDescription}
            aria-label={incrementLabel || iconDescription}
            class:bx--number__control-btn={true}
            class:up-icon={true}
            on:click={() => {
              updateValue(true);
            }}
            {disabled}
          >
            <Add class="up-icon" />
          </button>
          <div class:bx--number__rule-divider={true}></div>
        </div>
      {/if}
    </div>
    {#if !error && !warn && helperText}
      <div
        class:bx--form__helper-text={true}
        class:bx--form__helper-text--disabled={disabled}
      >
        {helperText}
      </div>
    {/if}
    {#if error}
      <div id={errorId} class:bx--form-requirement={true}>
        {invalidText}
      </div>
    {/if}
    {#if !error && warn}
      <div id={errorId} class:bx--form-requirement={true}>{warnText}</div>
    {/if}
  </div>
</div>