invoke

问题 I am struggling to get the image src of a image when its clicked. I just need the jQuery(this).attr("src") but in prototype, this.readAttribute doesn't work. I get: “this.readAttribute is not a function” $$('.more-views > ul > li > img').invoke('observe', 'click', this.updateImage.bind(this)); updateImage: function (){ //var src = jQuery(this).attr("src").replace("thumbnail/66x66", "image");//changes src from thumbnail to large image Needs the above but in prototype. //jQuery('#image').attr(

问题 I have two view controllers ( viewControllerA and viewControllerB ) with their own views. When the user touches a button in the view of viewControllerA , I am able to load the view of the viewControllerB . However, I don't know how to invoke a method in viewControllerB 's class! 回答1: Without much info to go on I'll assume that both A & B are of the same class (though they wouldn't have to be). You could always declare a property that would then point from one to the other: MyViewController.h:

问题 I have got a form with a TJvComboEdit control (from Jedi Visual Components library, jvcl) on it. This control has got an AutoCompleteList and if I set AutoCompleteOptions to acoUpDownKeyDropsList I can at runtime show this list by pressing the up or down key. So far, that's fine, but in addition to that I want the control's button to also show that list (like a TComboBox button does) but I can not find any way to do that. The showing of the list seems to be done by some internal IAutoComplete

问题 I'm trying to make a class which binds all classes which inherit a certain interface to be executed in an event fired by a custom entity framework model builder. What I have: 1) A generic interface IOverride which has a method Configure(EntityTypeConfiguration entity) 2) Several classes that implement the interface. public class ItemOverride : IOverride<Item> { public void Configure(EntityTypeConfiguration<Item> entity) { // Do something with entity } } 3) A method which gathers all classes

问题 I'm reading data from a serial port using an event listener from the SerialPort class. In my event handler, I need to update many (30-40) controls in my window with xml data coming over the serial port. I know that I must use myControl.Dispatcher.Invoke() to update it since it's on a different thread, but is there a way to update lots of controls together, rather than doing a separate Invoke call for each (i.e. myCon1.Dispatcher.Invoke(), myCon2.Dispatcher.Invoke(), etc)? I'm looking for

问题 I'm using a timer to reset a lable I use as a warning box. Basically, if the user does something (more specifically, something goes wrong, ex : He uses a word not recognized by the program), this catches what went wrong early and returns to him what happened so he can change the input. The reset blanks out the label after 5 seconds to prevent him from seeing something like "please do not use chinese characters" and maybe still thinking an old error is still up. This is what I got reading the

问题 I have one cfc file (info.cfc) with multiple functions as shown below. <cfcomponent output="true" extends="DateFunctions"> <cffunction name="getStatuses" access="remote" returntype="any" output="true" returnformat="plain"> ... </cffunction> <cffunction name="viewDate" access="remote" returntype="any" output="true" returnformat="plain"> <cfquery name="records"> SELECT dbo.tickets.Incident, dbo.tickets.Start_Date, dbo.tickets.Days_Due FROM dbo.tickets </cfquery> </cffunction> </component> And

问题 Shouldn't std::invoke be constexpr especially after constexpr lambdas in C++17? Are there any obstacles that will prevent this? 回答1: Update: P1065 will make it constexpr . Keep original post for historical reason: From the proposal: Although there is possibility to implement standard conforming invoke function template as a constexpr function, the proposed wording does not require such implementation. The main reason is to left it consistent with existing standard function objects, that could

问题 I am a novice programmer so I could be completely mistaken here, but this issue bugs me more then it should. This is actually a follow-up from this question. The accepted answer was, that you have to call InvokeRequired in order to avoid some overhead, because there is a chance you are already operating on the UI thread. In theory, I agree that it could save some time. After some tests I found out that using Invoke takes about twice the time compared to calling an operation normally (tests

问题 Long story short, I'm having a hell of a time trying to figure out how to use invoke and/or delegates to update the userform from a separate class when using threading. I'm quite sure it's something silly and obvious to someone with more experience. I know a delegate is probably required, but all my efforts seem to only work when it's being called from main thread. I've been looking around the internet for half the day, and there's just something I'm not getting. Here's some pseudo-code as an