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问题 I have a webapp using Spring-MVC built with Maven. When I generate the JAR file the app start just fine. The controller is execute but when I reach this part: @RequestMapping(value = "/test-block", method = RequestMethod.GET) public ModelAndView block(Model model) { return new ModelAndView("templates/test-block"); } I get this error: There was an unexpected error (type=Not Found, status=404). /WEB-INF/templates/test-block.jsp Note that debugging or running in the IDE works fine. My folder:

问题 I am working on angular project and came to a situation where i have series of div in a row and when user clicks on any div he should be able to move from one div to another using arrow key. Please help. I tried using keypress event but it didn't helped me. Tried finding out similar questions on stackoverflow but all answers where into jquery and i need it in in typescript. moveCell(e){ console.log(e); } .container{ width: 100%; } .cell{ width: 100px; float:left; } .cell:hover, .cell:focus{

问题 I have a webapp using Spring-MVC built with Maven. When I generate the JAR file the app start just fine. The controller is execute but when I reach this part: @RequestMapping(value = "/test-block", method = RequestMethod.GET) public ModelAndView block(Model model) { return new ModelAndView("templates/test-block"); } I get this error: There was an unexpected error (type=Not Found, status=404). /WEB-INF/templates/test-block.jsp Note that debugging or running in the IDE works fine. My folder:

问题 I am having trouble to prepare a summary table using dplyr based on the data set below: set.seed(1) df <- data.frame(rep(sample(c(2012,2016),10, replace = T)), sample(c('Treat','Control'),10,replace = T), runif(10,0,1), runif(10,0,1), runif(10,0,1)) colnames(df) <- c('Year','Group','V1','V2','V3') I want to calculate the mean, median, standard deviation and count the number of observations by each combination of Year and Group . I have successfully used this code to get mean , median and sd :

问题 I just started to use firebase Functions and I am new to the node.js environment, can somebody tell how to iterate through a child node and get the child values. 回答1: see this example: const parentRef = admin.database().ref("path"); return parentRef.once('value').then(snapshot => { const updates = {}; snapshot.forEach(function(child) { updates[child.key] = null; }); return parentRef.update(updates); }); 回答2: Have you looked through the Cloud Functions for Firebase Samples? They contain many

问题 I have a webapp using Spring-MVC built with Maven. When I generate the JAR file the app start just fine. The controller is execute but when I reach this part: @RequestMapping(value = "/test-block", method = RequestMethod.GET) public ModelAndView block(Model model) { return new ModelAndView("templates/test-block"); } I get this error: There was an unexpected error (type=Not Found, status=404). /WEB-INF/templates/test-block.jsp Note that debugging or running in the IDE works fine. My folder:

问题 I am having trouble to prepare a summary table using dplyr based on the data set below: set.seed(1) df <- data.frame(rep(sample(c(2012,2016),10, replace = T)), sample(c('Treat','Control'),10,replace = T), runif(10,0,1), runif(10,0,1), runif(10,0,1)) colnames(df) <- c('Year','Group','V1','V2','V3') I want to calculate the mean, median, standard deviation and count the number of observations by each combination of Year and Group . I have successfully used this code to get mean , median and sd :

问题 I am having trouble to prepare a summary table using dplyr based on the data set below: set.seed(1) df <- data.frame(rep(sample(c(2012,2016),10, replace = T)), sample(c('Treat','Control'),10,replace = T), runif(10,0,1), runif(10,0,1), runif(10,0,1)) colnames(df) <- c('Year','Group','V1','V2','V3') I want to calculate the mean, median, standard deviation and count the number of observations by each combination of Year and Group . I have successfully used this code to get mean , median and sd :

问题 so in my Vue-project I basically have two pages/components that will be shown with the use of vue-router depending on the url. I can switch between those pages/components via a button. I am also using vuex for the management of some data. Now I included a switch in one of the components to toggle between a dark and a light theme from vuetify. In the template for this component I do: <v-switch label="Toggle dark them" @change="toggleDarkTheme()" ></v-switch> And in the function that gets

问题 I've developed custom keyboard on android, and I want to add a button to enable my keyboard and redirect the user to the page of virtual keyboards or to page manage keyboards so that the user can just turn on my keyboard from there, for example similar to the one in "a.i.typekeyboard", kindly see the screenshot. 回答1: Just open input method settings activity using Intent . Intent enableIntent = new Intent(Settings.ACTION_INPUT_METHOD_SETTINGS); enableIntent.setFlags(Intent.FLAG_ACTIVITY_NEW