Gallery

The gallery widget shows a set of images and allows you to select one of them.

{
    "name": "my-gallery",
    "type": "gallery",
    "params": {...}
}

Images

You can add images by specifying their URLs.

To do so, in the items array, define objects with the name and previewUrl properties. Such an object will add an image to the widget.

{
  "type": "gallery",
  "name": "my-gallery",
  "params": {
    "items": [
      {
        "name": "kitten-1",
        "previewUrl": "https://placekitten.com/300/300"
      },
      {
        "name": "kitten-2",
        "previewUrl": "https://placekitten.com/310/310"
      },
      {
        "name": "kitten-3",
        "previewUrl": "https://placekitten.com/330/330"
      }
    ]
  }
}

The gallery widget allows you to add images using the REST API. In this case, you can will need the ajax widget.

{
  "widgets": [
    {
      "type": "ajax",
      "name": "bg-request",
      "params": {
        "url": "http://example.com/api/backgrounds/kitten",
        "method": "GET"
      }
    },
    {
      "type": "gallery",
      "name": "my-gallery",
      "params": {
        "prompt": "Choose a background",
        "items": "{{$['bg-request'].response}}"
      }
    }
  ]
}

Title

Let's add titles to images.

{
  "type": "gallery",
  "name": "my-gallery",
  "title": "This is my gallery widget",
  "params": {
    "items": [
      {
        "name": "kitten-1",
        "title": "Kitten 1",
        "previewUrl": "https://placekitten.com/300/300"
      },
      {
        "name": "kitten-2",
        "title": "Kitten 2",
        "previewUrl": "https://placekitten.com/310/310"
      },
      {
        "name": "kitten-3",
        "title": "Kitten 3",
        "previewUrl": "https://placekitten.com/330/330"
      }
    ]
  }
}

Show titles

You can show or hide image titles depending on the showTitles property.

{
  "type": "gallery",
  "name": "my-gallery",
  "title": "This is my gallery widget",
  "params": {
    "showTitle": false,
    "items": [
      {
        "name": "kitten-1",
        "title": "Kitten 1",
        "previewUrl": "https://placekitten.com/300/300"
      },
      {
        "name": "kitten-2",
        "title": "Kitten 2",
        "previewUrl": "https://placekitten.com/310/310"
      },
      {
        "name": "kitten-3",
        "title": "Kitten 3",
        "previewUrl": "https://placekitten.com/330/330"
      }
    ]
  }
}

Prompt

In prompt, you can explain what the user is supposed to do with this widget. This prompt appears under the widget title.

{
  "type": "gallery",
  "name": "my-gallery",
  "title": "This is my gallery widget",
  "prompt": "Select an image",
  "params": {
    "items": [
      {
        "name": "kitten-1",
        "title": "Kitten 1",
        "previewUrl": "https://placekitten.com/300/300"
      },
      {
        "name": "kitten-2",
        "title": "Kitten 2",
        "previewUrl": "https://placekitten.com/310/310"
      },
      {
        "name": "kitten-3",
        "title": "Kitten 3",
        "previewUrl": "https://placekitten.com/330/330"
      }
    ]
  }
}

Description

An additional description can be displayed as a tooltip. To see this description, click the i icon.

{
  "type": "gallery",
  "name": "my-gallery",
  "title": "This is my gallery widget",
  "prompt": "Select an image",
  "description": "Click an image",
  "params": {
    "items": [
      {
        "name": "kitten-1",
        "title": "Kitten 1",
        "previewUrl": "https://placekitten.com/300/300"
      },
      {
        "name": "kitten-2",
        "title": "Kitten 2",
        "previewUrl": "https://placekitten.com/310/310"
      },
      {
        "name": "kitten-3",
        "title": "Kitten 3",
        "previewUrl": "https://placekitten.com/330/330"
      }
    ]
  }
}

Force selection

The forceSelection property selects the first item when a page loads.

{
  "type": "gallery",
  "name": "my-gallery",
  "title": "This is my gallery widget",
  "prompt": "Select an image",
  "description": "Click an image",
  "params": {
    "forceSelection": true,
    "items": [
      {
        "name": "kitten-1",
        "title": "Kitten 1",
        "previewUrl": "https://placekitten.com/300/300"
      },
      {
        "name": "kitten-2",
        "title": "Kitten 2",
        "previewUrl": "https://placekitten.com/310/310"
      },
      {
        "name": "kitten-3",
        "title": "Kitten 3",
        "previewUrl": "https://placekitten.com/330/330"
      }
    ]
  }
}

Preselected item

When you force the initial selection, you can specify which image must be selected in the preselected property with an item name.

{
  "type": "gallery",
  "name": "my-gallery",
  "title": "This is my gallery widget",
  "prompt": "Select an image",
  "description": "Click an image",
  "params": {
    "preselected": "kitten-3",
    "items": [
      {
        "name": "kitten-1",
        "title": "Kitten 1",
        "previewUrl": "https://placekitten.com/300/300"
      },
      {
        "name": "kitten-2",
        "title": "Kitten 2",
        "previewUrl": "https://placekitten.com/310/310"
      },
      {
        "name": "kitten-3",
        "title": "Kitten 3",
        "previewUrl": "https://placekitten.com/330/330"
      }
    ]
  }
}

Images in vars

Instead of hardcoding images in a widget, you can define their links in the vars section. For more details about vars, refer to the Structure topic.

First, in the vars section, define the image URLs.

Then, in the items array, refer to them by using the each as dynamic expression.

{
  "vars": {
    "images": [
      "https://placekitten.com/300/300",
      "https://placekitten.com/310/310",
      "https://placekitten.com/320/320"
    ]
  },
  "widgets": [
    {
      "type": "gallery",
      "name": "my-gallery",
      "title": "Choose a picture",
      "params": {
        "items": {
          "{{#each vars.images as image}}": {
            "name": "{{image}}",
            "title": "{{`kitten${index+1}`}}",
            "previewUrl": "{{image}}"
          }
        }
      }
    }
  ]
}

Name	Type	Description	Default value
items	array of items	Defines a set of images.	empty array
title	string	(Optional) Shows a title.	empty string
showTitle	boolean	(Optional) Shows or hides image titles.	true
prompt	string	(Optional) Shows a description under the title.	empty string
description	string	(Optional) Shows an additional description in a tooltip.	empty string
forceSelection	boolean	(Optional) Selects the first image when a page is loaded.	false
preselected	string	(Optional) Defines the item to be selected if forceSelection is true.	empty string

Items

Name	Type	Description	Default value
name	string	An identifier of an item.	empty string
title	string	(Optional) Shows a title under an image.	empty string
previewUrl	string	An image URL.	empty string