Microsoft AJAX jscript $发现不适用于隐藏/不可见元素吗？

Question

Microsoft AJAX jscript $发现不能在隐藏/不可见元素上工作吗？ 我似乎无法得到它的工作，但我不知道这是否是预期的行为。

Answer 1

如果你设置了一个控制false的Visible属性，那么$find不会找到任何东西，因为asp.net不会产生与Visible属性设置为false控件的HTML。但它应该工作，如果您使用CSS/JavaScript隐藏控制。

Answer 2

你是积极的元素是在DOM（即：可见= True）？下面是一些reference info为预期的行为：

$find实际调用findComponent：

Sys.Application = new Sys._Application(); 
window.$find = Sys.Application.findComponent; 

findComponent: function _Application$findComponent(id, parent) { 
     /// <summary locid="M:J#Sys.Application.findComponent">Finds top-level components that were added through addComponent if no parent is specified or children of the specified parent. If parent is a component</summary> 
     /// <param name="id" type="String">The id of the component to find.</param> 
     /// <param name="parent" optional="true" mayBeNull="true">The component or element that contains the component to find. If not specified or null, the search is made on Application.</param> 
     /// <returns type="Sys.Component" mayBeNull="true">The component, or null if it wasn't found.</returns> 
     //#if DEBUG 
     var e = Function._validateParams(arguments, [ 
      {name: "id", type: String}, 
      {name: "parent", mayBeNull: true, optional: true} 
     ]); 
     if (e) throw e; 
     //#endif 
     // Need to reference the application singleton directly beause the $find alias 
     // points to the instance function without context. The 'this' pointer won't work here. 
     return (parent ? 
      ((Sys.IContainer.isInstanceOfType(parent)) ? 
       parent.findComponent(id) : 
       parent[id] || null) : 
      Sys.Application._components[id] || null); 
    },