Lightswitch多對多控制

Question

我有一個多對多的控件複選框列表，用戶可以選擇項目。我想知道默認情況下，當在初始化數據工作區方法屏幕上加載屏幕時，是否可以選擇列表。

感謝

Answer 1

在關於這個職位，這應該幫助您設置的細節默認值選取器。（HTML客戶端）

Lightswitch HTML Client - set modal picker value when screen created

但作爲鏈接可以打破，繼承人如何做到這一點的總結...

1. 將下面的代碼添加到屏幕的js文件（更改應用程序數據到您的數據源）

   function defaultLookup (entity, destinationPropertyName, sourceCollectionName, options) { 
   /// <summary> 
   /// Defaults an entity's lookup property 
   /// </summary> 
   /// <param name="entity" type="Object">The entity featuring the lookup property to default</param> 
   /// <param name="destinationPropertyName" type="String">The lookup property against the entity to default</param> 
   /// <param name="sourceCollectionName" type="String">The collection from which to source the lookup value</param> 
   /// <param name="options" type="PlainObject" optional="true"> 
   /// A set of key/value pairs used to select additional configuration options. All options are optional. 
   /// <br/>- String filter: If supplied, defines the match condition for the required default, otherwise the lookup defaults to the first entry in the source collection 
   /// </param> 
   options = options || {}; // Force options to be an object 
   var source = myapp.activeDataWorkspace.ApplicationData[sourceCollectionName]; // DataServiceQuery 
   var query = {}; //DataServiceQuery 
   if (options.filter) { 
       query = source.filter(options.filter); 
   } else { 
       query = source.top(1); 
   } 
   query.execute().then(function (result) { 
       entity[destinationPropertyName] = result.results[0]; 
   }); 
   

   };

2. 設置於外鍵爲主（這是屏幕創建的代碼下）的值：

   var defaultValue = "Goods in"; 
   //screen.ShippingDetails.ShippingName; 
   var filter = "(ShippingName eq " + msls._toODataString(defaultValue, ":String") + ")"; 
   defaultLookup((1)screen.Order, "(2)ShippingDetail", "(3)ShippingDetails", { filter: filter }); 
   

（1）指的是你目前

屏幕（2 ）引用左側面板中的表名稱（ShippingDetail）

（3）引用解決方案資源管理器（ShippingDetails）中的表名稱