Update navdata-service.ts

src/service/app/navdata-service.ts

@@ -319,7 +319,20 @@ export default class NavDataService {
      * @memberof NavDataService
      */    
     public addNavDataByOnly(curNavData:NavDataElement){
-        this.navDataStack.push(curNavData);
+        if(this.navDataStack.length >0){
+            let tempIndex:number = this.navDataStack.findIndex((element:NavDataElement) =>{
+                return Object.is(element.tag,curNavData.tag);
+            })
+            if(tempIndex === -1){
+                this.navDataStack.push(curNavData);
+            }else{
+                this.navDataStack[tempIndex] = curNavData;
+            }
+        }else{
+            this.navDataStack.push(curNavData);
+        }
+        this.sessionStore.setItem('srfnavdata',JSON.stringify(this.navDataStack));
+        return curNavData;
     }
 
     /**
@@ -339,4 +352,32 @@ export default class NavDataService {
             return null;
         }
     }
+
+    /**
+     * 从导航数据栈中获取指定元素前一个元素
+     * 
+     * @memberof NavDataService
+     */    
+    public getPreNavDataByTag(viewtag:string){
+        if(this.navDataStack.length >0){
+            let tempIndex:number = this.navDataStack.findIndex((element:NavDataElement) =>{
+                return Object.is(element.tag,viewtag);
+            })
+            return this.navDataStack[tempIndex - 1]?this.navDataStack[tempIndex - 1]:null;
+        }else{
+            return null;
+        }
+    }
+
+    /**
+     * 从导航数据栈中删除所有数据
+     * 
+     * @memberof NavDataService
+     */    
+    public removeAllNavData(){
+        if(this.navDataStack.length >0){
+            this.navDataStack = [];
+            this.sessionStore.setItem('srfnavdata',JSON.stringify(this.navDataStack));
+        }
+    }
 }
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