dynamic

问题 I have a dynamic tableview and a prototype cell which displays an array. My questions is how would I add a button which displays different names on each cell to the Left side of the cell and then a label to the right side displaying the array info. Thanks! :D So imagine this is the cell below: Left side:Button(array info) <-------------------> Right side:TextLabel(array info) 回答1: You can implement like this let titleArray = ["a", "b", "c"] func tableView(tableView: UITableView,

问题 So, I'm new to dynamic web design (my sites have been mostly static with some PHP), and I'm trying to learn the latest technologies in web development (which seems to be AJAX), and I was wondering, if you're transferring a lot of data, is it better to construct the page on the server and "push" it to the user, or is it better to "pull" the data needed and create the HTML around it on the clientside using JavaScript? More specifically, I'm using CodeIgniter as my PHP framework, and jQuery for

问题 I just learned in class that R uses lexical scoping, and tested it out in R Studio on my computer and I got results that fit dynamic scoping, not lexical? Isn't that not supposed to happen in R? I ran: y <- 10 f <- function(x) { y <- 2 y^3 } f(3) And f(3) came out to be 4 (2^3) not 100 (10^3), even though my class presented this slide: http://puu.sh/pStxA/0545079dbe.png . Isn't that dynamic scoping? I may just be looking at this wrong, but is there a mode on a menu somewhere where you can

问题 I have a Spring Boot project with multiple databases of different years and these databases have same tables so the only difference is the year (..., DB2016, DB2017). In the controller of the application i need to return data that belong to "different" years. Moreover in future years other databases will be created (eg. in 2018 there's going to be a db named "DB2018"). So my problem is how to switch the connection among databases without creating a new datasource and a new repository every

问题 Is it possible to dynamically instantiate a class using a variable? For example is something like this possible in PHP? class foo { public $something; } $class_name = "foo"; $f = new $class_name(); 回答1: That should work, yes. You can also do: $f = new $class($arg1,$arg2); 回答2: Yes, this code will work fine. 回答3: In PHP 5 can I instantiate a class dynamically? Yes you can, your code should work fine. 回答4: Yes of course you can instantiate using dynamic names; 来源： https://stackoverflow.com

问题 How do I change something like this: CharSequence cs[] = { "foo", "bar" }; to: CharSequence cs[]; cs.add("foo"); // this is wrong... cs.add("bar"); // this is wrong... 回答1: Use a List object to manage items and when you have all the elements then convert to a CharSequence. Something like this: List<String> listItems = new ArrayList<String>(); listItems.add("Item1"); listItems.add("Item2"); listItems.add("Item3"); final CharSequence[] charSequenceItems = listItems.toArray(new CharSequence

问题 I like to implement linked list in c++ ,while adding new node I dynamically allocate it, if some allocation fails I would like my program to stop the execution. After the "new Node" fails the exception is thrown so do I have to call the destructor explicitly in the exception handler. how can I deal with this situation in order to prevent memory leak? Here is my code that I have written LinkedList.h #pragma once #include <iostream> #include <string.h> using namespace std; class LinkedList {

问题 As a follow on to an answered question on Adding Components Dynamically in JSF 2.0 (see link below), I like the approach of using a dataTable, but what about Removing one of the added components? How to dynamically add JSF components 回答1: Based on the code snippet in the other question you linked, you need to do the following changes: Add a column with a delete button to the table. <h:column><h:commandButton value="delete" action="#{bean.delete}" /></h:column> Add a DataModel<Item> property

问题 I have the following validation code for a text field but the 'field' below needs to be replaced with the name of the text field, which is created dynamically. My problem is it has a square bracket in the name - options[483998] How would I go about adding this to the code below as obviously if I do a direct replace of field with options[483998] it creates invalid coding. jQuery("#product_addtocart_form").validate({ rules: { field: { required: true, range: [100, 2540] } } }); 回答1: Demo - http:

问题 Suppose that I have the following piece of Kotlin code: fun main(args: Array<String>) { val a = "test" println(args.first()) } If I pass in an argument $a , the output is going to be $a . As I understand it Kotlin takes care of String templates by generating the code for the output on compilation, presumably using a StringBuilder. Is there some way to evaluate Strings that aren't in the source code with regards to templates in their current context? String templates are very useful and it'd