click | 易学教程

get the position of picturebox that has been clicked

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问题 I want to get the position of the picturebox that has been cliked by the mouse,but i don't know how?? I mean the position of picturebox not the form that the picturebox on it. thanks. 回答1: MUGAN's close. The Point you'll get from MouseEventArgs is the "screen" point of the mouse, where 0,0 is the top left of the entire monitor or desktop (however you want to think of it). To convert that to a "client" point within the PictureBox control, where 0,0 is the top left of that PictureBox, you'll

Dynamic-usercontrol click event

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问题 UserControl: private string lastName; public string LastName { get { return lastName; } set { lastName = value; lastNameTextBox.Text = value; } } Form: using (SqlConnection myDatabaseConnection = new SqlConnection(myConnectionString.ConnectionString)) { myDatabaseConnection.Open(); using (SqlCommand SqlCommand = new SqlCommand("Select LasatName from Employee", myDatabaseConnection)) { int i = 0; SqlDataReader DR1 = SqlCommand.ExecuteReader(); while (DR1.Read()) { i++; UserControl2 usercontrol

Checking if clicks are within a graphic object [Python Graphics Module]

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问题 Here is the module I'm using: http://mcsp.wartburg.edu/zelle/python/graphics/graphics.pdf I want to see whether a user's clicks are within a shape or not. I used the in operator, but I know that is incorrect. Below is a chunk of my code: win = GraphWin("Click Speed", 700, 700) theTarget = drawTarget(win, random.randrange(0,685), random.randrange(0,685)) while theTarget in win: click = win.getMouse() if click in theTarget: print("Good job") I left out the code that draws theTarget shape

Getting the colour of where you have clicked on a JPanel?

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问题 I only want a method to activate if the pixel that is clicked is white. How would I implement this? Trying to look for a method that returns the colour at a coord, but I can't find one. 回答1: Depends. If you have got a BufferedImage (or some other Image) you can use its getRGB methods (or getRaster().getPixel ). If you haven't, you can use JPanel's createImage methods and use the returned image to get the pixel data. 来源： https://stackoverflow.com/questions/2623351/getting-the-colour-of-where

jquery click on href link - have to click twice

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问题 The function works, but the popup will open only after the button is clicked twice (and then, subsequent clicks get the action on the first click). $(document).ready(function(){ $('a#printPosBtn').on('click', function(e) { e.preventDefault(); $('.printPopup').popupWindow({ centerBrowser:1, height:500, width:720, scrollbars: 1, resizable: 1 }); return false; }); }); What's wrong? 回答1: I think that is because you are actually initialising the plugin within the click handler. From a quick skim

click event is not working in ipad

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问题 Here is my code: var tmp = plugin.main_video_src.split("_")[1] if(tmp == 2) { $('.flex-direction-nav .flex-next').click(); } This works perfectly in PC browser, But its not working in iPad. Any solution? Advance Thanks. 回答1: It could be because you're trying to react to events on an html element that isn't clickable. This tutorial will explain how Making Elements Clickable Because of the way Safari on iOS creates events to emulate a mouse, some of your elements may not behave as expected on

GWT Timer cancel not working

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问题 I am trying to write a code to differentiate between simgle and double clicks using GWT and GWTQuery. I got the idea here. So I translated it into GWT like this: (my app can't have global variables, so I am doing that part with element attributes instead): $("img").live("click", new Function() { public boolean f(Event event) { String clicksString = $(event).attr("clicks"); int clicks = Integer.parseInt(clicksString); clicks++; $(event).attr("clicks",String.valueOf(clicks)); Timer t = new

jquery事件重复绑定

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本文实例分析了jQuery防止重复绑定事件的解决方法。分享给大家供大家参考，具体如下：一、问题：今天发现jQuery一个对象的事件可以重复绑定多次，当事件触发的时候会引起代码多遍执行。下面是一个click事件被重复绑定的示例: ? 1 2 3 4 5 6 7 8 9 10 11 12 13 function reg_button_click(){ $( "#button).click(function(){ alert(" button click"); }); } $(document).ready( function (){ #重复注册3次 reg_button_click(); reg_button_click(); reg_button_click(); #触发的时候出现3个alert $( '#button' ).click(); }); 二、解决方法：对于需要重复绑定的场景，再事件注册时候考虑用先unbind 再bind的方法；或者先off 再on ? 1 2 3 4 5 6 7 8 9 10 11 12 13 function reg_button_click(){ $( "#button).unbind('click').bind('click',(function(){ alert(" button click"); }); } $(document)

How to detect if the Control.Click event was by the mouse, keyboard, or something else?

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问题 How can I tell if a Control.Click event was triggered by the mouse or by the keyboard? Edit: Handling MouseClick and KeyPress does't work for me, because then how would I know if something else triggered the click? (e.g. PerformClick ) 回答1: You can't. Use the Control.MouseClick event and the Control.KeyPress event so you can tell the source of the event. And remember that a space on the control with focus and a Ctrl+ key can generate a click on a button as well. 回答2: You can not tell, but you

getting correct click coords with ggplot map in shiny

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问题 I have the start of a shiny app with a ggplot map of the world. I would like to get the coordinates of the click on the plot so users can do things with the map, but the coordinates are very strange (either NULL or something very small). Clicking repeatedly only seems to change one coordinate: ui.R: library(shiny) # Define UI for application shinyUI(pageWithSidebar( # Application title headerPanel("My App"), sidebarPanel( textOutput("clickcoord") ), # Show a plot of the generated distribution