DataV:Drop-Down List Box

Chart Style

The drop-down box selector is a type of control component. It can be used as a drop-down box form in visual applications to submit the user-selected data to the backend for processing or through interactive configuration to display the user-selected content on other components.

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 family of the text. Default value: Microsoft Black. Note Select a font that is already installed on your operating system. If no font is installed, the default font is displayed.
  Selected by Default	The content displayed by default when the drop-down box is initialized. You need to enter the content that already exists in the option. Note If the drop-down box selector is blank, the drop-down box displays the first value value in the data by default.
  Retain Selected Values	If you turn on the switch, the selected values are retained when data is updated. If you turn off the switch, the selected values are not retained when data is updated.

• Input Box Style

  • Background Color: the background color of the drop-down box. For more information, see color picker description.

  • Indent: the indentation of the prompt text in the drop-down box selector.

  • Input: If you turn on the switch, you can enter text in the input box. If you turn off the switch, you cannot enter text in the input box.

  • Prompt Text Style: This style takes effect configuration items on the PC.

    Parameter	Description
    Text Content	The content of the prompt text.
    Color	The color of the prompt text.
    Size	The font size of the prompt text.
    Font weight	The font weight of the text. Default value: Normal.

  • Text Style: the style of the selected text in the drop-down list.

    Parameter	Description
    Color	The color of the selected text.
    Size	The font size of the selected text.
    Font weight	The font weight of the selected text. Default value: Normal.

  • Border Style

    • Normal Style

      Parameter	Description
      Fillet	The round border radius of a button. The value range is 0–360. When the value is 0, the drop-down box is square. When the value is 360, the drop-down box is round.
      Width	The border width.
      Color	The border color.

    • Hover Style

      Parameter	Description
      Fillet	The rounded corner of the border when the pointer is hovered. Valid values: 0 to 360. When the value is 0, the drop-down box is square. When the value is 360, the drop-down box is round.
      Width	The width of the border when the mouse hovers.
      Color	The color of the border when the mouse hovers.

    • Selected Style

      Parameter	Description
      Fillet	The rounded border of the selected item. Valid values: 0 to 360. When the value is 0, the drop-down box is square. When the value is 360, the drop-down box is round.
      Width	The width of the border of the selected item.
      Color	The color of the border of the selected item.

  • Arrow Style: the arrow style of the drop-down box.

    Parameter	Description
    Size	The size of the drop-down arrow.
    Color	The color of the drop-down arrow.
    Right Offset Value	The distance between the arrow of the drop-down box and the right border of the widget.

• drop-down box style: The style configuration items takes effect on the PC. The original style is used on the mobile client.

  • Maximum height of container: the maximum height of the container in the drop-down list. Unit: pixels.

  • Option Height: the height of each option in the drop-down list. Unit: pixels.

  • Pitch at Top of Container: the distance between the top of the container in the drop-down box and the drop-down box selector. Unit: pixels.

  • Transition Animation: If you turn on the switch, the drop-down box is turned on. If you turn off the switch, the transition animation is turned off.

  • Hide Scroll Bar: If you turn on the switch, the scroll bar is hidden. If you turn off the switch, the scroll bar is displayed.

  • Icon Configuration:

  • Border Style

    Parameter	Description
    Border Width	The border width of the drop-down box. Unit: pixels.
    Border Color	The color of the drop-down box border.
    Border Fillet	The rounded corners of the border of the drop-down box. Valid values: 0 to 360. When the value is 0, the drop-down box is square. When the value is 360, the drop-down box is round.
    Line Type	The line type of the border of the drop-down box. Default value: Solid.

  • Hover Style

    • Normal Style

      Parameter	Description
      Background color	The background color of the options in the drop-down box.
      Border Color	The border color of the options in the drop-down box.
      Color	The font color of the options in the drop-down box.
      Size	The font size of the options in the drop-down box.
      Font weight	The font weight of the option in the drop-down box. Default value: normal.

    • Selected Style: the style of the selected options in the drop-down list. For more information, see Common styles.

Data Panel

value: What is displayed for each option in the drop-down box selector.

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 Enable on the right of Current Value Changes to enable the widget interaction feature. The drop-down box selector component has interactive configurations. You can change the content of the selected items in the drop-down box, trigger a data request, return a callback value, and then configure the settings in other components. By default, the value value configured in the data panel is returned. For more information, see Configure callback IDs.

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 the Drop-Down List Box component in the Import Nodes pane. You can view the parameters of the drop-down selector on 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 the current value changes	The event is triggered with a data item when the current value changes. The data item corresponds to the changed value.

   • 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, if the drop-down selector is configured with the API data source as https://api.test and the data transferred to the request data interface as { 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.
     Obtain the current drop-down box value	Indicates that the selected value in the current input box is obtained.
     Set the value of the current radio box	Indicates that the value in the current input box is set.
     Clear a component to its default value	The default value is restored.
     Clear Selected Items	Clear the value of the selected item.
     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	The display widget. For more information, see the following example. 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 implicit state	Specifies whether to show or hide a widget. For more information, see the following example. return { "animationIn": { "animationType": "", "animationDuration": 1000, "animationEasing": "linear" }, "animationOut": { "animationType": "", "animationDuration": 1000, "animationEasing": "linear" } };
     Move	Move a widget to a specified location. For more information, see the following data example. 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" } };