UI5中sap.m.ColumnListItem的busy属性无法生效，疑似Bug？

Hey there, let's break down why setting setBusy(true) on a ColumnListItem isn't working as expected, and what you can do about it:

1. Check if This Is Expected Behavior #

First off, it’s worth noting that while ColumnListItem inherits the busy property from ListItemBase, the control might not have built-in rendering logic to display a row-level busy indicator. Unlike StandardListItem—which has a dedicated layout to show busy states—ColumnListItem is designed to hold multiple columns of content, and the framework might not prioritize a row-level busy indicator out of the box.

2. Verify the Control's API Implementation #

If you check the UI5 documentation for ColumnListItem, you’ll find that even though the busy property exists, there’s no explicit mention of it being supported for visual feedback. This is a common pattern in UI5: some inherited properties are present but not fully implemented for specific controls.

3. Workarounds to Achieve Row-Level Busy State #

Since direct setBusy(true) isn’t working, here are a few reliable workarounds:

• Set Busy on a Container Inside the Row: Wrap all content in your ColumnListItem inside a sap.m.VBox or sap.m.HBox, then call setBusy(true) on that container. This will cover the entire row’s content with a busy indicator.
• Custom Busy Indicator with CSS: Add a custom CSS class to the ColumnListItem when it should be busy, then use CSS to overlay a semi-transparent background and a loading spinner. For example:

  .custom-busy-row {
    position: relative;
    opacity: 0.6;
    pointer-events: none;
  }
  .custom-busy-row::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
  }
  @keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
  }
  

• Use a Custom ColumnListItem Template: Create a custom template that includes a sap.m.BusyIndicator bound to a boolean property in your model. Toggle this property to show/hide the indicator over the row.

4. Report as a Potential Bug #

Since you’ve confirmed the issue exists in SAP’s official responsive table sample and even the UI5 diagnostic tool can’t trigger the busy state, this might be an oversight in the control’s implementation. You can check SAP’s GitHub repository for existing issues, or submit a new bug report if none exist.

内容的提问来源于stack exchange，提问作者Angus