Tuesday, May 29, 2012

Problems with libraries

The following is documented on stackoverlow and not directly related to my GSoC work but in case Google directs someone with the same problem here and as a "”warning” for any New Visioners I decided to document it here.

I was trying out the new library service for Apps, however I was working on the assumption that if the script works on my end it would work as a library the same way, and it is true for most things. But, I had very very bad luck and most of my script

depended on handlers (had a nice GUI) so I did not test it as a library but only wrote code in my editor and tested it from there, after 3-4 days of very hard work I had a surprise, a bad one,  “Unknown macro” was the error and I got it from every handler not defined in the main panel. To make this clear let’s say the code was this:

 

1 function notWorkingGUI(){
2
3 var app=UiApp.createApplication();
4 var appPanel=app.createVerticalPanel().setId("appPanel");
5 var handler1=app.createServerHandler("handlerFunction1").addCallbackElement(appPanel);
6 var firstButton=app.createButton("Button 1", handler1);
7
8 appPanel.add(firstButton);
9 app.add(appPanel);
10
11 SpreadsheetApp.getActive().show(app);
12
13 }
14
15 function handlerFunction1(e){
16
17 var app=UiApp.getActiveApplication();
18
19 var appPanel2=app.createVerticalPanel().setId("appPanel2").setStyleAttribute("zIndex", 0).setStyleAttribute("position", "fixed");
20 var handler2=app.createServerHandler("handlerFunction2").addCallbackElement(appPanel2);
21 var secondButton=app.createButton("Button 2", handler2);
22 var label=app.createLabel("This should get visible after the click").setId("label").setVisible(false);
23
24 appPanel2.add(secondButton).add(label);
25 app.add(appPanel2);
26
27 return app;
28
29
30 }
31
32 function handlerFunction2(e){
33
34 var app=UiApp.getActiveApplication();
35
36 app.getElementById("label").setVisible(true);
37
38 return app;
39
40 }

Now If You would copy-paste this to Your Apps Script editor it would work like a charm, however if You would make it a library and call it like this:


 


1 function notWorking(){
2
3
4 Error.notWorkingGUI()
5
6
7 }

Only the first button click would be recognized, when clicking the second button the unknown macro error would be thrown.


Now, I could not find a solution anywhere so I “invented” my own,. I do not recommend it, but if this bug is not fixed an You really really need to have something like the code above (that is a handler created as a response to a handler) You can do it like this:


1 function workingGUI(){
2
3 //previous first part
4 var app=UiApp.createApplication();
5 var appPanel=app.createVerticalPanel().setId("appPanel");
6 var handler1=app.createServerHandler("handlerFunction1a").addCallbackElement(appPanel);
7 var firstButton=app.createButton("Button 1", handler1);
8
9
10 //previous second part
11 var appPanel2=app.createVerticalPanel().setId("appPanel2").setStyleAttribute("zIndex", 0).setStyleAttribute("position", "fixed");
12 var handler2=app.createServerHandler("handlerFunction2a").addCallbackElement(appPanel2);
13 var secondButton=app.createButton("Button 2", handler2).setId("button2");
14
15
16 appPanel.add(firstButton);
17 app.add(appPanel);
18
19 SpreadsheetApp.getActive().show(app);
20
21 }
22
23 function handlerFunction1a(e){
24
25 var app=UiApp.getActiveApplication();
26
27
28
29 var label=app.createLabel("This should get visible after the click").setId("label").setVisible(false);
30
31 app.getElementById("appPanel2").add(app.getElementById("button2")).add(label);
32 app.add(app.getElementById("appPanel2"));
33
34 return app;
35
36
37 }
38
39 function handlerFunction2a(e){
40
41 var app=UiApp.getActiveApplication();
42
43 app.getElementById("label").setVisible(true);
44
45 return app;
46
47 }
48
49

Again I do not recommend this but it works. Also before You go ahead and try solving it with a class (OOP) I tried Apps will not recognize a handler if it is part of the same class the GUI code is in. I also tried with making two classes, one which would have the code for the GUI and another with all the handlers, was a dead end.


 


Cheers,

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