DataV:Image Carousel

Chart style

A image carousel is a type of media component that supports custom image carousel and carousel animation effects. It can display multiple images in turn in visual applications.

Settings Panel

• Search for Configurations: In the right-side panel of Canvas Editor, click the Settings tab, and click Search for Configurations in the upper-right corner. Enter the required configuration item in the search box, and click the search icon to quickly locate the configuration item. Fuzzy match is supported. For more information, see Search for asset configurations.
• Size: indicates the size of a widget, including its pixel width and height. You can click the icon to proportionally adjust the width and height of a widget. After you click this icon again, you can adjust the width and height as needed.
• Position: the position of a widget, which is indicated by pixel X and Y coordinates. X-coordinate indicates the pixel distance between the upper-left corner of the widget and the left border of the canvas. Y-coordinate indicates the pixel distance between the upper-left corner of the widget and the upper border of the canvas.
• Rotation Angle: the angle of a rotation that uses the center point of a widget as the rotation point. The unit is degrees (°). You can use one of the following methods to control the rotation angle of a widget:
  • Directly enter the degrees in the Rotation Angle spin box or click the plus sign (+) or minus sign (-) to increase or decrease the value in the Rotation Angle spin box.
  • Drag the black dot in the icon.
  • Click the icon to horizontally flip a widget.
  • Click the icon to vertically flip a widget.
• Opacity: the opacity of a widget. Valid values: 0 and 1. If this parameter is set to 0, the widget is hidden. If this parameter is set to 1, the widget is completely displayed. Default value: 1.

• Global Style

  Parameter	Description
  Font	The font of the text in the image carousel widget. Select a font that is installed in your computer. Otherwise, the default font is used.
  Font size	The font size of the text in the image carousel widget. Valid value: 10 to 100.

• Animation

  Parameter	Description
  Automatic Carousel	Specifies whether to enable or disable automatic carousel.
  Pause	The time interval to rotate the images. Unit: ms.
  Speed	The duration of the animation. Unit: ms.
  Special Effects	The effect of the animation. You can select Horizontal Scrolling, Vertical Scrolling, Fade, or Mosaic.

• Image

  Parameter	Description
  Default Image	image carousel the default image. Drag the local image to the dashed box or enter the URL of the image. To delete an image, move the pointer over the image box and click Delete. Note If the url field in the data panel is empty, the image in the default image configuration items is used.
  Filling Method	The filling mode of the image. Valid values: Stretch to Fill Container, Fill Container, and Center.

• Description: the description style of each image in the carousel. You can click the icon to display or hide the description.

  • Background Color: the background color of the description.

    Parameter	Description
    Color Style	The style of the background color. You can select Gradient or Monochrome.
    Color	The background color. This parameter is valid only when the Color Style parameter is set to Monochrome.
    Start Color	The start color of the background. For more information, see color picker description. This value is valid only when the Color Style is set to Gradient.
    End Color	The end color of the background. This parameter takes effect only when the Fill Style parameter is set to Gradient.
    Angle	The direction in which the two color gradients begin to end.

  • Color: the color of the description text.

  • Font Weight: the font weight of the description text.

  • Width (%): the percentage of the description width to the widget width.

  • Height: the percentage of the height of the widget. Unit: %.

  • Top: the top padding of the description from the top border of the widget. Unit: pixels.

  • Left Margin: the distance between the description bar and the left boundary of the widget. Unit: pixels.

  • Alignment: describes the alignment of the text. You can select Left, Center, or Right.

• Dot: the dot style at the bottom of the image carousel. You can click the icon to control the visibility of the dot.

  Parameter	Description
  Dot Color	The dot color of the images that are not in display.
  Current Color	The dot color of the image that is in display.

Data Panel

Configuration field description

Table 1. Parameters

Parameter	Description
Controlled Mode	If you turn on the switch, data is not requested when a widget is initialized. Data requests are triggered only based on callback IDs or the method configured in Blueprint Editor. If you turn off the switch, data requests are automatically triggered. By default, the switch is turned off.
Auto Data Request	After you select the Auto Data Request check box, you can enable dynamic polling, and manually specify the polling interval. If you do not select this check box, data is not automatically requested. You must manually refresh the page to request data or use Blueprint Editor or callback ID events to trigger data requests.
Data Source	In the right-side panel of Canvas Editor, click the Data tab. Click Set next to Static Data. In the Configure Datasource panel, select a data source from the Data Source Type drop-down list. Enter code for data query in the code editor, click Preview Data Response to preview the response of the data source, and then view the response. For more information, see Configure asset data.
Data Filter	If you select the Data Filter check box, you can convert the data structure, filter data, and perform simple calculations. If you click the plus sign (+) next to Add Filter, you can configure the script for the data filter in the editor that appears. For more information, see Use the data filter.
Data Response Result	The response to a data request. If the data source changes, you can click the icon next to Data Response Result to view the data response in real time.

Interaction Panel

Select the Enable check box to enable interactions between widgets. When you click an image, a data request is triggered to pass callback IDs. This allows you to dynamically load data of the image carousel widget. By default, the description and url parameters are passed. For more information, see Configure a callback ID.

Configure interactions in Blueprint Editor

1. In Canvas Editor, right-click a widget in the Layer panel and select Add to Blueprint Editor.
2. Click the icon in the upper-left corner of the page.

3. In Blueprint Editor, click Image Carousel in the Imported Nodes pane. You can view the image carousel parameters in the canvas, as shown in the following figure.

   • Event

     Event	Description
     When the data interface request is completed	The event is triggered with the processed JSON data after a data interface request is responded and processed by a filter. For more information about specific data examples, see the Data Response Result section of the Data tab in the right-side configuration panel of the canvas editor.
     When a data interface request fails	The event that is returned when a data interface request fails (the request may be due to network problems or interface errors) and is processed by the filter. The event also throws the processed JSON data. For more information about specific data examples, see the Data Response Result section of the Data tab in the right-side configuration panel of the canvas editor.
     When you click on the image	When you click an image, this event is triggered to pass the description and URL of the image.

   • Policy Action

     Policy Action	Description
     Request Data Interface	This action is performed to request the server data again. The data sent by an upstream data processing node or layer node is used as a parameter. For example, image carousel the API data source is https://api.test and the data transferred to the request data interface is { id: '1'}, the final request interface is https://api.test?id=1.
     Import data	After data of a widget is processed in accordance with its drawing format, the widget is imported for redrawing. You do not need to request server data again. For more information about specific data examples, see the Data Response Result section of the Data tab in the right-side configuration panel of the canvas editor.
     Start carousel	Start to play the image in turn. The following example shows the reference data. return { "index": 0 // The sequence number of the image in the component data source. By default, the value starts from 0. }
     Stop carousel	This action stops rotating the images and does not need parameter input.
     Turn to the previous page	This action displays the previous image based on the sequence number of the current image and does not need parameter input.
     Go to the next page	This action displays the next image based on the sequence number of the current image and does not need parameter input.
     Turn to a page	Play an image without parameters.
     Update component configurations	Style configurations of widgets are dynamically updated. Before this action is executed, you must click the widget in Canvas Editor, click the Settings tab in the right-side panel, and click Copy Configurations to... to obtain widget configurations. After that, change the style field for the data processing node in Blueprint Editor.
     Display	Displays the widget. The following example shows the reference data. return { "animationType": "", "animationDuration": 1000, "animationEasing": "linear" };
     Hide	The following example shows how to hide a widget. return { "animationType": "", "animationDuration": 1000, "animationEasing": "linear" };
     Switch to the hidden state	Specifies whether to show or hide a widget. The following example shows the reference data. return { "animationIn": { "animationType": "", "animationDuration": 1000, "animationEasing": "linear" }, "animationOut": { "animationType": "", "animationDuration": 1000, "animationEasing": "linear" } };
     Move	Move a widget to a specified location. The following example shows the reference data. return { // The positioning type. to indicates absolute positioning, whereas by indicates relative positioning. The default value is to. "positionType": "to", // The location, which is indicated by the x and y coordinates. "attr": { "x": 0, "y": 0 }, // The animation type. "animation": { "enable": false, // The duration in which animation is displayed. "animationDuration": 1000, // The animation curve, which can be set to linear|easeInOutQuad|easeInOutExpo. "animationEasing": "linear" } };