dynamic

问题 I've been trying to make a tab view and thought content projection might be a good approach.I learned it from this article. I thought that I could make it dynamic by just inputting a given array of components, and they would be displayed as the page for the selected tab. Here is my attempt at doing this: @Component({ selector: 'my-app', template:` <h1>Experiments</h1> <button class="add-button" (click)="add()">Add</button>` }) export class App { components:Array<any> = [PrepSetupTab

问题 I have installed this flag icon scss gem in my Rails 5 app. https://github.com/eugenegarl/flag-icons-rails I'm trying now to figure out how I can use it with my Address model so that the helper gets the country name from the Address table and uses that to display the correct flag. I can't find a way to give dynamic input to the flag helper. The gem's readme has an instruction which I can't make sense of: Do not add gem to assets section if you want to use flag_icon rails helper. What are the

问题 I'm trying to perform the following int myObject = getValues(someVar).Sum(x => Int32.Parse(x.Price)) The function looks this: List<dynamic> getValues(string something) {...} This is the error I'm receiving: "Cannot use a lambda expression as an argument to a dynamically dispatched operation" How can I SUM the values of a List object in a chained call similar to LINQ SUM? 回答1: Your code works. The problem you are having isn't in the code you posted. This code runs. void Main() { int myObject =

问题 In some other programming languages I am used to, there was a way to dynamically create and call variables. How to do this in Python? For example let's suppose variables called test1; test2 etc. up to test9, and I want to call them like this: for n in range(1,10): print concatenate('test', n) Of course, the function concatenate is the one I am looking for. What is the command to combine strings, integers and regular expressions in this way? My example was a bad one, that made some of the

问题 Scenario I have created a page where the client can build their own page, calendars, widgets, articles etc. I have created a second Dynamic builder page where they can build their own newsletters. Problem All my css is referenced with classes, because mailers are very limited I have to add all styles inline . Question Is there a script I can run to grab all referenced styles via class, and add it to the relevant elements/tags inline-styles? Example [simple] <p class='txtBlack'>Hello World</p>

问题 I am sorry about the title of this post, but I've no idea how to describe my problem. So, I've got the following really simple code: dynamic obj = new myClass(); // In my case it is a COM object int FileCount = 0; FileCount = obj.SomeMethod(); But at runtime I get something like this: Whats going on there? Why isn't Filecount = 0 ? Why is it null? 回答1: Are you in Release build?. If FileCount is not used somewhere else the variable might be optimized out by the compiler. Try doing that in

问题 I'm trying to implement dynamic ngPattern. My regex changes when the user clicks on a button or selects a value from dropdown. But for some reason this doesnt seem to work. Below is the code. app.controller('testController',function(){ $scope.pattern = new RegExp('^\w{1,10}$'); $scope.changePattern = function () { $scope.pattern = new RegExp('^\d{5}$'); }; }); But when i try something like this, it works. $scope.pattern = /^\w{1,10}$/; $scope.changePattern = function () { $scope.pattern = /^

问题 I am new to shiny so this might be a very basic question. I want to write a shiny app where the user inputs 'n' and we get n number of selectInput options and am not able to do it. Basically any form of for loop is not working. The code I attempted is following library(shiny) ui = fluidPage( sidebarLayout( sidebarPanel( textInput(inputId = "number", label = "number of selectInput",value = 5) ), mainPanel( uiOutput(outputId = "putselect") ) ) ) server = function(input,output){ output$putselect

问题 I have several dataSources I use for one UIViewController. My view controller uses KeyValue Observing in order to follow the state of certain properties at runtime. When I swap dataSources, I need to stop observing those properties. The problem is, I'm not sure of the class of the dataSource at runtime, therefor something like this is not valid: if (aDataSource != dataSource) { // Ensure we stop observing the existing dataSource, otherwise bad stuff can happen. [dataSource removeObserver:self

问题 I'm working with an R program where I've dynamically created an S4 class. I would like to somehow loop through each of the variables in this class to write to a table. classStructure <<- getColumns(jobClass) myclass <- setClass("myclass", slots = classStructure) method <<- setClassMethods() setClassMethods <- function(){ setGeneric("myclass", def = function(myclassVar, level, outFile){ standardGeneric("myclassMethod") }) setMethod("myclassMethod", signature = "myclass", function(myclassVar,