dynamic

问题 I am creating a dynamic form based on Angular 4 Dynamic Forms . Everything is working out great! However, I have run into an issue with the dropdown. I would like to have a dependent dropdown. When the user selects a value in the dropdown it will display checkboxes, based on an attribute - possibly name . service new DropdownInput({ key: 'dropdown', label: 'Dropdown Testing', options: [ {key: 'example1', value: 'Example 1'}, {key: 'example2', value: 'Example 2'} ], order: 1 }), new

问题 I'm wondering if there's a better way to add dynamic methods to an existing object. Basically, I am trying to assemble new methods dynamically and then append them to an existing function. This demo code works. builder = function(fn, methods){ //method builder for(p in methods){ method = 'fn.' + p + '=' + methods[p]; eval(method); } return fn; } test = {} test = builder(test, {'one':'function(){ alert("one"); }','two':'function(){ alert("two"); }'} ); test.one(); test.two(); 回答1: You don't

问题 I managed to pull the layouts, and i add it to my viewflipper, however, there it is loaded as blank. The code is, Resources packageResources; Context packageContext; try { packageResources = pm.getResourcesForApplication(packageName); packageContext = this.createPackageContext(packageName, Context.CONTEXT_INCLUDE_CODE + Context.CONTEXT_IGNORE_SECURITY); } catch(NameNotFoundException excep) { // the package does not exist. move on to see if another exists. } Class layoutClass; try { // using

问题 I just wrote a nice library that handles nicely a dynamic array allocated on heap in C. It supports many operations, is relatively simple to use "feeling" almost like a regular good old array. It is also easy to simulate many data structures based on it (stacks, queues, heaps, etc...) It can handle arrays of any type, but the problem is that there's only a single type per compilation. C doesn't have templates, so it's impossible to have for example dynamic arrays of ints and dynamic arrays of

问题 I hold body of method in string. I want to create method dynamically. But I don't know, how to set its body. I saw very tedious way using CodeDom. And I saw using Emit with OpCodes. Is any way to use ready code from string variable? string method_body = "return \"Hello, world!\";"; //there is method body DynamicMethod dm = new System.Reflection.Emit.DynamicMethod("My_method", typeof(string), new Type[] { }); //any way to create method dynamically //any way to set body string result = (string

问题 There are different ways of creating dynamic strings in C (with length that constantly changes). After some google search, the main way of doing this is to use realloc(). A way I implemented this is using linked lists with 32 bytes chunks for each node. I was wondering if there are better ways of tackling this apart from using realloc() and linked lists, and what the cons and pros for each method are. EDIT The reason I am doing this is because I'm receiving dynamic data from a socket recv() ,

问题 There are different ways of creating dynamic strings in C (with length that constantly changes). After some google search, the main way of doing this is to use realloc(). A way I implemented this is using linked lists with 32 bytes chunks for each node. I was wondering if there are better ways of tackling this apart from using realloc() and linked lists, and what the cons and pros for each method are. EDIT The reason I am doing this is because I'm receiving dynamic data from a socket recv() ,

问题 I am trying to learn about structs, pointers, and dynamic arrays in C. I don't understand how to create a dynamic array of structs using pointers. My code doesn't work, and I don't know what's wrong with it. I have seen several examples of dynamic arrays, but non with structs. Any help would be appreciated. Please give some explanation, not just code snippets as I do want to understand not just solve this problem. #include<stdio.h> #include<stdlib.h> #include <string.h> struct *struct_array;

问题 I have this program that dynamically adds pictureboxes referring to the number of president in the database. How do i put them inside the groupbox and align the pictureboxes inside the groupbox? And the groupbox should stretch if the pictureboxes are many. I have this codes now : private void Form1_Load(object sender, EventArgs e) { conn.Open(); try { cmd = new SqlCommand("SELECT COUNT(Position) FROM TableVote WHERE Position='" + "President" + "'", conn); Int32 PresCount = (Int32)cmd

问题 I am taking a C++ class and have a assignment which requires me to dynamically allocate memory for a struct. I don't recall ever going over this in class and we only briefly touched on the new operator before going on to classes. Now I have to "Dynamically allocate a student and then prompts the user for student’s first name, a last name, and A - number(ID number). " my struct is written like struct Student { string firstName, lastName, aNumber; double GPA; }; I tried Student student1 = new