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问题 when Im cloning an object in javascript by doing object.cloneNode(true) the parentNode is null in the new copy. Im trying to set it but with no success. my code look like this: old_DataRoot = DataRoot.cloneNode(true); old_DataRoot.parentNode=DataRoot.parentNode.cloneNode(true); also tried: old_DataRoot = DataRoot.cloneNode(true); old_DataRoot.parentNode.appendChild(DataRoot.parentNode.cloneNode(true)); both options give me "old_DataRoot.parentNode is null or not an object" what am I doing

问题 I have read many posts on this topic but have not been able to solve it =( I'm trying to save a parent and its children that have a one-to-many relationship. I believe I'm following the documentation and other suggestions from other posts. However, the problem I'm having is that when Hibernate tries to save the child records, it's inserting '0' for the FK to the parent, instead of the real id. The parent hbm.xml mapping <hibernate-mapping> <class name="ParentClass" table="PARENTTABLE"> <id

问题 I have a content div, that has a header div, which contains two other divs, and then a final div that is not in the header, but is in the content. However, it looks like the last child div of content is not actually contained in the content. Here is the CSS: div.outline {border: 1px solid red;} #content{background-color:tan;} #container{width:680px;overflow:hidden;} #header{margin-bottom:10px; background-color:yellow;} #title{float:left;} #link{float:right;} .clear_it{clear:both;} #chooser

问题 I'm binding an ItemsControl with Canvas as ItemsPanelTemplate to an ObservableCollection. I want to make the items draggable using the DraggableExtender as posted in Dragging an image in WPF (I don't want to use transforms - I need to use the Canvas Left and Top properties) It's defined as : <ItemsControl ItemsSource="{Binding Path=Nodes}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <Canvas IsItemsHost="True" /> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate>

问题 In a java program, I create a file with File temp = new File("temp"); temp.createNewFile(); Then for some reason when I write File pDir = temp.getParentFile(); and pDir is null. I actually want to write File pDir = temp.getParentFile().getParentFile(); but that throws a null pointer exception. 回答1: You need a file with a path for that, try getAbsoluteFile. File pDir = temp.getAbsoluteFile().getParentFile(); 回答2: You're creating a file called temp, but it has no path, so there will be no

问题 I want to access variables of a form from another form. On clicking a button inside my Main form, I want to set my Main form as Parent, then bring up another form (child form) wherein I will access variables of the Main form. My click handler is as follow: private void btnSystem_Click(object sender, EventArgs e) { Form_EnterPassword EP = new Form_EnterPassword(); EP.Parent = this; //error: Top-level control cannot be added to a control EP.ShowDialog(); } It compiles fine without any error.

问题 I'm trying to create a parallax effect whereby an absolutely positioned child element should move at a rate slower than it's parent on scroll. The child will always be 130% height of the parent but the parent can be any height: HTML: <div class="parallax-window lg"> <div class="parallax-image image-1"></div> <div class="parallax-content">Hello World</div> </div> <div class="parallax-window"> <div class="parallax-image image-2"></div> <div class="parallax-content">Hello World</div> </div> CSS:

问题 I have ItemsControl that is bound to collection of type Student. Inside the ItemTemplate I have a TextBox that uses IValueConverter to do some custom calculations and logic. I want to pass the actual Student object to the value converter, instead a property of it. How can I do that? Here's a sample of my code. <ItemsControl ItemsSource="{Binding StudentList}"> <ItemsControl.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Name}" /> <TextBlock Text="{Binding ????, Converter=

问题 Parent) as csv (700,000 rows) input Child Parent fA00 f0 fA9 fA0 fA31 fA0 fA30 fA0 fA1 fA00 dccfA1 fA00 fA2 fA00 fA3 fA00 fA01 fA00 fA4 fA00 fA5 fA00 fA6 fA00 fA7 fA00 fA0 fA00 fA142149 fA00 fA02 fA00 fA8 fA00 qA1 fA10 fA22 fA10 fA23 fA10 fA11 fA10 qA2 fA10 fA15 fA11 fA13 fA11 fA12 fA11 fA14 fA13 fA17 fA16 fA18 fA17 fA19 fA17 fA20 fA17 fA21 fA19 etc.... It goes up to 14 levels deep. The top parent is f0 I want to iterate through the child parent relationships to determine the path Expected

问题 I'm trying to let the child read its parent's vars and vice versa. The parent has no problems reading the child's vars, but for some reason the child gets only "undefined" as an answer...(instead of the "456") Parent script var mySwf var masterVar=456 function startLoad() { var myLoader:Loader = new Loader(); var mRequest:URLRequest = new URLRequest("test1.swf"); myLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onCompleteHandler); myLoader.contentLoaderInfo.addEventListener