render

问题 I'm using useState() in function component and first render is calling twice. Is it correct or mistake? If it is correct why does it render twice? setCount renders the component twice too. function Example() { const [count, setCount] = useState(0); console.log("render"); return ( <div> <p>You clicked {count} times</p> <button onClick={() => setCount(count + 1)}> Click me </button> </div> ); } ReactDOM.render(<Example />, document.getElementById('uu5')); Thanks 回答1: Problem is in React

问题 I'm using useState() in function component and first render is calling twice. Is it correct or mistake? If it is correct why does it render twice? setCount renders the component twice too. function Example() { const [count, setCount] = useState(0); console.log("render"); return ( <div> <p>You clicked {count} times</p> <button onClick={() => setCount(count + 1)}> Click me </button> </div> ); } ReactDOM.render(<Example />, document.getElementById('uu5')); Thanks 回答1: Problem is in React

问题 How to solve this error: Render problem Path.op() not supported I tried to force refresh layout, restart, update Android Studio, stop antivirus for a while, but the problem is still there. Surprisingly I am able to compile and run the app, but how to get rid of this error? I am using: Android Studio 3.5.3 Android SDK Tools 29.0.2 Android SDK Platform Android 10.0 (Q) Android SDK Platform 29 Default OpenJDK Platform binary to reproduce the error: Create new Android project with empty activity

问题 Through my view I collected some data that I want to bundle together in a list of values that look like this : data = [(1,2,3,4,5,6,7,8),(1,2,3,4,5,6,7,8),(1,2,3,4,5,6,7,8)] Then I'll be rendering that to my template to unpack the data to my page : return render(request, 'accounts/page.html', {'data' : data}) Template goes like this : {% for a,b,c,d,e,f,g,h in data %} <h3>{{a}}</h3> <h3>{{b}}</h3> #and so on #.. <h3>{{h}}</h3> {% endfor %} So the error i get is : Need 2 values to unpack in

问题 Through my view I collected some data that I want to bundle together in a list of values that look like this : data = [(1,2,3,4,5,6,7,8),(1,2,3,4,5,6,7,8),(1,2,3,4,5,6,7,8)] Then I'll be rendering that to my template to unpack the data to my page : return render(request, 'accounts/page.html', {'data' : data}) Template goes like this : {% for a,b,c,d,e,f,g,h in data %} <h3>{{a}}</h3> <h3>{{b}}</h3> #and so on #.. <h3>{{h}}</h3> {% endfor %} So the error i get is : Need 2 values to unpack in

问题 Through my view I collected some data that I want to bundle together in a list of values that look like this : data = [(1,2,3,4,5,6,7,8),(1,2,3,4,5,6,7,8),(1,2,3,4,5,6,7,8)] Then I'll be rendering that to my template to unpack the data to my page : return render(request, 'accounts/page.html', {'data' : data}) Template goes like this : {% for a,b,c,d,e,f,g,h in data %} <h3>{{a}}</h3> <h3>{{b}}</h3> #and so on #.. <h3>{{h}}</h3> {% endfor %} So the error i get is : Need 2 values to unpack in

问题 I'm trying to make a ComboBox that uses different colors for different items. I wrote out some test code but it doesn't seem to work. Adding in the renderer causes the program to crash but commenting it out makes the box display on in the frame. Is there anything I'm missing or am I doing this the wrong way? I tried using the custom ComboBox Renderer tutorial as an example. Here is my code: TestComboColor.java import java.awt.Color; import javax.swing.JComboBox; import javax.swing.JFrame;

问题 I'm trying to make a ComboBox that uses different colors for different items. I wrote out some test code but it doesn't seem to work. Adding in the renderer causes the program to crash but commenting it out makes the box display on in the frame. Is there anything I'm missing or am I doing this the wrong way? I tried using the custom ComboBox Renderer tutorial as an example. Here is my code: TestComboColor.java import java.awt.Color; import javax.swing.JComboBox; import javax.swing.JFrame;

问题 We have some PDF files and instead of giving direct link to to file, we want it to render through php so that only authenticated users are able to download the pdf file. Thus we dont need to give filepath to user. Is it possible? Mangesh 回答1: You can, here is a sample: <?php $file = './path/to/the.pdf'; $filename = 'You dont know where I am.pdf'; header('Content-type: application/pdf'); header('Content-Disposition: inline; filename="' . $filename . '"'); header('Content-Transfer-Encoding:

问题 I'm working on a top down RPG game using LibGDX, and am creating an Ortho.. camera for my game. However in doing so, only my tile textures render now. This is how the render code looks: Camera initialized as new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); (note that the camera. calls are actually in the world.update method, I just figured I would minimize the amount of code needed on here) Updating/Rendering: camera.position.set(getPlayer().getPosition().x,