invalidation

问题 I have the following code : var fomattedDate = moment(myDate).format("L"); Sometimes moment(myDate).format("L") returns "Invalid date", I want to know if there is a way to prevent that and return an empty string instead. 回答1: TL;DR If your goal is to find out whether you have a valid date, use Moment's isValid : var end_date_moment, end_date; jsonNC.end_date = jsonNC.end_date.replace(" ", "T"); end_date_moment = moment(jsonNC.end_date); end_date = end_date_moment.isValid() ? end_date_moment

问题 I cannot find any definition for invalidation of pointers/references in the Standard. I ask because I just found out that C++11 forbids copy-on-write (COW) for strings. As far as I understand, if COW was applied then p would be still a valid pointer and r a valid reference after the following commands: std::string s("abc"); std::string s2(s); char * p = &(s2[0]); char & r = s2[0]; s2[1] = "B"; Just they would no longer point/refer to the first character of s2 , but merely to the first

来源： https://stackoverflow.com/questions/32235525/delay-on-sliderinput

来源： https://stackoverflow.com/questions/32235525/delay-on-sliderinput

问题 After few days of research and reading documentation, I'm almost sure It's nearly impossible, but still I would like to ask: The goal is to invalidate all cached content in GCloud CDN on demand (due to headers changes) on the 3rd party backend, which does not use that CDN. Using gsuite it can be achieved by using the following command: gcloud compute url-maps invalidate-cdn-cache web --path '/*' --async But the problem is that this command requires us to login to google account via browser

问题 Currently, I am creating a web application for an online shopping cart and I need to maintain session on each jsf page.. My questions are : How can I create and destroy session in managed bean How can I access value stored in session variable? Like this? FacesContext.getCurrentInstance().getExternalContext().getSessionMap.put("key",object); How can I destroy a session in jsf I also need to destroy the session using session.invalidate() but i am failed !! 回答1: How can I create and destroy

问题 Currently, I am creating a web application for an online shopping cart and I need to maintain session on each jsf page.. My questions are : How can I create and destroy session in managed bean How can I access value stored in session variable? Like this? FacesContext.getCurrentInstance().getExternalContext().getSessionMap.put("key",object); How can I destroy a session in jsf I also need to destroy the session using session.invalidate() but i am failed !! 回答1: How can I create and destroy

问题 I'm trying to implement a logout in my application, so I made this: public String logout(){ try{ FacesContext facesContext = FacesContext.getCurrentInstance(); ExternalContext ex = facesContext .getExternalContext(); ex.invalidateSession(); return "success"; }catch(Exception e){ return "error"; } } But when I check if the user is logged, it says yes: public class AuthenticateListener implements PhaseListener { @Override public void afterPhase(PhaseEvent event) { AuthorizedUser authorized =

问题 BufferedReader hl = new BufferedReader(new InputStreamReader(getResources().openRawResource(R.raw.lines))); while(hl.ready()){ showLines.append(hl.readLine()+"\n"); showLines.invalidate(); Thread.sleep(10); } That is my code but it is not redrawing when I tell it to. It is supposed to redraw after every line that is added to textview, but it still only redraws at the end? Can someone please help me, I can't figure it out. 回答1: That is bacause your invalidate() is in a thread while loop and is

问题 I am currently working on a custom View which draws some tiles on the canvas. Those tiles are loaded from several files and will be loaded when needed. They will be loaded by an AsyncTask. If they are already loaded they will just be painted on the canvas. This is working properly! If those pictures are loaded the AsyncTask is firing view.postInvalidate() The problem is that my custom View is not firing onDraw(Canvas canvas) everytime I fire view.postInvalidate(). The view.postInvalidate only