Preset categories

An editing extension can organize presets into categories. This creates a visual hierarchy that makes it easier for users to navigate a large number of presets.
This topic explains how to organize presets into categories.
If any presets are organized into categories, all presets must be organized into categories. You can’t organize a subset presets into categories.
Prerequisites
You’re comfortable with JavaScript.
You know how to create an editing extension.
You know how presets work.
Step 1: Create a localized label for each category
Before submitting a public app for review, you must upload all user-facing strings to the extension via its Translation field. This includes the names of preset categories. Canva refers to these strings as localized labels.
You can skip this step if you're creating a team app or your app is under active development.
The following snippet demonstrates how to create a file that contains two localized labels:
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{
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  "en": [
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    {
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      "key": "categoryOne",
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      "value": "Category #1",
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      "translatorNote": "Label for the first category."
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    },
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    {
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      "key": "categoryTwo",
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      "value": "Category #2",
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      "translatorNote": "Label for the second category."
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    }
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  ]
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}
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To learn more about localized labels, see Translations.
Step 2: Assign a category to each preset
The next step is to assign categories to the extension's presets. The process for assigning categories to presets is a little different depending on whether the presets are static or dynamic.
Static presets
At the moment, extensions that support static presets must also support the onPresetsRequest callback, as described in the Dynamic presets section. This is a temporary requirement that will be phased out in the future.
In the extension’s Presets JSON file, add a category property to each preset.
If you're creating a team app or the app is still in development, set the value of the category property to the name of a category:
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[
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  {
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    "id": "invert",
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    "label": "Invert",
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    "asset": "invert.png",
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    "kind": "simple",
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    "category": "Category #1"
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  },
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  {
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    "id": "grayscale",
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    "label": "Grayscale",
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    "asset": "grayscale.png",
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    "kind": "simple",
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    "category": "Category #2"
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  },
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  {
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    "id": "sepia",
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    "label": "Sepia",
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    "asset": "sepia.png",
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    "kind": "simple",
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    "category": "Category #2"
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  }
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]
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If you're submitting a public app for review, set the value of the category property to the key of a localized label:
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[
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  {
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    "id": "invert",
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    "label": "Invert",
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    "asset": "invert.png",
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    "kind": "simple",
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    "category": "categoryOne"
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  },
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  {
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    "id": "grayscale",
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    "label": "Grayscale",
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    "asset": "grayscale.png",
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    "kind": "simple",
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    "category": "categoryTwo"
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  },
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  {
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    "id": "sepia",
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    "label": "Sepia",
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    "asset": "sepia.png",
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    "kind": "simple",
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    "category": "categoryTwo"
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  }
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]
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Presets with the same values for their category properties are arranged into groups.
Dynamic presets
In the extension's onPresetsRequest callback, add a categoryId property to each preset:
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canva.onPresetsRequest(async (opts) => {
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  const presets = [
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    {
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      id: "invert",
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      label: "Invert",
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      kind: "simple",
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      categoryId: "categoryOne",
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    },
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    {
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      id: "grayscale",
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      label: "Grayscale",
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      kind: "simple",
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      categoryId: "categoryTwo",
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    },
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    {
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      id: "sepia",
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      label: "Sepia",
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      kind: "simple",
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      categoryId: "categoryTwo",
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    },
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  ];
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​
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  // Download the thumbnail images
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  const thumbnails = await Promise.all(
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    presets.map((preset) => {
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      const assetUrl = state.assets[preset.id + ".png"];
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      return imageHelpers.fromUrl(assetUrl);
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    })
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  );
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​
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  // Return the presets
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  return presets.map((preset, index) => {
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    return {
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      ...preset,
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      image: thumbnails[index],
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    };
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  });
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});
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The value of this property must be the key of a localized label.
Presets with the same values for their categoryId properties are arranged into groups.
Example
index.js
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const { imageHelpers } = window.canva;
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const canva = window.canva.init();
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​
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const state = {
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  assets: null,
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  element: null,
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  canvas: null,
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  image: null,
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  selectedPreset: null,
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};
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​
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canva.onReady(async (opts) => {
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  // Keep track of the assets
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  state.assets = opts.assets;
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​
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  // Keep track of the element
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  state.element = opts.element;
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​
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  // Download the image
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  state.image = await imageHelpers.fromElement(state.element, "preview");
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​
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  // Convert the image into an HTMLCanvasElement
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  state.canvas = await imageHelpers.toCanvas(state.image);
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​
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  // Render the image
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  document.body.appendChild(state.canvas);
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​
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  if (opts.presetId) {
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    // Keep track of the selected preset
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    state.selectedPreset = opts.presetId;
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​
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    // Render the image with preset applied
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    await renderImage();
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  }
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});
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​
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canva.onPresetsRequest(async (opts) => {
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  const presets = [
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    {
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      id: "invert",
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      label: "Invert",
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      kind: "simple",
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      categoryId: "categoryOne",
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    },
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    {
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      id: "grayscale",
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      label: "Grayscale",
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      kind: "simple",
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      categoryId: "categoryTwo",
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    },
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    {
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      id: "sepia",
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      label: "Sepia",
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      kind: "simple",
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      categoryId: "categoryTwo",
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    },
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  ];
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​
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  // Download the thumbnail images
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  const thumbnails = await Promise.all(
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    presets.map((preset) => {
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      const assetUrl = state.assets[preset.id + ".png"];
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      return imageHelpers.fromUrl(assetUrl);
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    })
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  );
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​
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  // Return the presets
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  return presets.map((preset, index) => {
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    return {
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      ...preset,
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      image: thumbnails[index],
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    };
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  });
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});
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​
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canva.onPresetSelected(async (opts) => {
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  // Keep track of the selected preset
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  state.selectedPreset = opts.presetId;
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​
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  // Re-render the image when a user selects a preset
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  await renderImage();
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});
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​
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canva.onImageUpdate(async (opts) => {
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  // Handle image update requests from Canva
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  state.image = opts.image;
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​
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  // Re-render the image
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  await renderImage();
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});
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​
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canva.onSaveRequest(async () => {
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  // Download the full image
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  state.image = await imageHelpers.fromElement(state.element, "full");
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​
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  // Re-render the image
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  await renderImage();
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​
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  // Return the image to Canva
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  return await imageHelpers.fromCanvas(state.image.imageType, state.canvas);
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});
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​
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async function renderImage() {
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  const img = await imageHelpers.toImageElement(state.image);
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  const context = state.canvas.getContext("2d");
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​
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  if (state.selectedPreset === "invert") {
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    context.filter = `invert(100%)`;
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  }
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​
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  if (state.selectedPreset === "grayscale") {
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    context.filter = `grayscale(100%)`;
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  }
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​
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  if (state.selectedPreset === "sepia") {
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    context.filter = `sepia(100%)`;
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  }
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​
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  context.drawImage(img, 0, 0, state.canvas.width, state.canvas.height);
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}
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presets.json
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[
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  {
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    "id": "invert",
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    "label": "Invert",
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    "asset": "invert.png",
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    "kind": "simple",
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    "category": "categoryOne"
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  },
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  {
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    "id": "grayscale",
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    "label": "Grayscale",
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    "asset": "grayscale.png",
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    "kind": "simple",
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    "category": "categoryTwo"
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  },
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  {
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    "id": "sepia",
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    "label": "Sepia",
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    "asset": "sepia.png",
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    "kind": "simple",
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    "category": "categoryTwo"
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  }
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]
Copied!
labels.json
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{
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  "en": [
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    {
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      "key": "categoryOne",
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      "value": "Category #1",
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      "translatorNote": "Label for the first category."
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    },
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    {
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      "key": "categoryTwo",
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      "value": "Category #2",
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      "translatorNote": "Label for the second category."
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    }
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  ]
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}
Copied!
invert.png
grayscale.png
sepia.png

Dynamic preset thumbnails

Presets JSON

Last modified 2mo ago

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Contents

Prerequisites

Step 1: Create a localized label for each category

Step 2: Assign a category to each preset

Example