Google Appmekar按日期排序无效，myDataSource1.query.sorting.inwarddate._ascending()求助

Hey there! Let's work through that date sorting issue you're hitting in Google App Maker. I’ve seen this exact problem before, so let’s break down why your code isn’t working and how to fix it properly.

First: Why Your Current Code Isn’t Taking Effect #

Your line myDataSource1.query.sorting.inwarddate._ascending() sets the sorting rule, but it’s missing one critical step—and there are a few other potential gotchas:

• No data refresh: The sorting rule is applied, but the datasource doesn’t automatically re-fetch the sorted data. You need to trigger a load to make it stick.
• Wrong timing: If you run this code before the datasource finishes loading initially, the sort won’t apply to the loaded data.
• Field type mismatch: Double-check that your inwarddate field is defined as a Date type in your App Maker data model. If it’s stored as a string, sorting will use alphabetical order instead of chronological, which won’t behave like you expect.

Correct Ways to Implement Date Sorting in App Maker #

Option 1: No-Code Visual Editor (For Static Sorting) #

If you want the data to load sorted every time without writing code:

• Go to your datasource (under Data > Datasources) or the widget bound to it (like a Table or List).
• In the properties panel, find the Sorting section.
• Click Add Sort, select inwarddate, and pick Ascending or Descending.
• This setting saves automatically, so your data will load in the correct order on every page load.

Option 2: Code-Based Dynamic Sorting #

If you need to trigger sorting programmatically (like when a user clicks a button), follow this full workflow:

1. Set the sorting rule (and clear old ones if needed)

   // Clear existing sorts to avoid conflicting rules
   myDataSource1.query.sorting.clear();
   // Apply ascending sort to inwarddate
   myDataSource1.query.sorting.inwarddate._ascending();
   

2. Refresh the datasource to apply the sort
   This is the step you were missing! The sort rule is useless until you tell the datasource to re-fetch data with the new rule:

   myDataSource1.load();
   

Example: Toggle Sort with a Button

If you want users to switch between ascending/descending order:

// Add this to your button's onClick event handler
const currentSortDirection = myDataSource1.query.sorting.inwarddate;
if (currentSortDirection === 'asc') {
  myDataSource1.query.sorting.inwarddate._descending();
} else {
  myDataSource1.query.sorting.inwarddate._ascending();
}
// Refresh to apply the new sort
myDataSource1.load();

Quick Troubleshooting Tips #

• Test with simple dates: Create test records with obvious chronological dates (like 2024-01-01, 2024-01-02, 2024-01-03) to rule out weird data formatting issues.
• Check filters: Active filters on the datasource can sometimes hide sorted results, so verify no filters are interfering.
• Debug with console logs: Add console.log(myDataSource1.query.sorting) after setting the sort to confirm the rule is applied correctly.

内容的提问来源于stack exchange，提问作者priyanka