fix:chart事件失效问题 (#5765)

examples/components/EventAction/cmpt-event-action/ChartEvent.jsx

@@ -45,6 +45,16 @@ export default {
               }
             }
           ]
+        },
+        legendselectchanged: {
+          actions: [
+            {
+              actionType: 'toast',
+              args: {
+                msg: '${event.data|json}'
+              }
+            }
+          ]
         }
       },
       config: {

packages/amis/src/renderers/Chart.tsx

@@ -309,7 +309,7 @@ export class Chart extends React.Component<ChartProps> {
     const {data, dispatchEvent} = this.props;
 
     dispatchEvent(
-      (ctx as any).event,
+      (ctx as any).event || ctx.type,
       createObject(data, {
         ...pick(
           ctx,