Using url links to get to different eHMI pages

PLCnext Engineer
1

I am looking into a more modular way to work with the HMI:
In my code I would have a dictionary type of array
aHL[0].sOption1Text := ‘Go to\
Power Page’;
aHL[0].sOption1Url:='https://192.168.14.114/ehmi/hmiapp.html?HmiPage=eltek.json’;
aHL[1].sOption1Text := ‘Go to\
Safety Page’;
aHL[1].sOption1Url:='https://192.168.14.114/ehmi/hmiapp.html?HmiPage=safety.json’;
And then define which part of the dictionary to use:
IF eHandlerVal = eHandler#Power THEN sHL := aHL[0];
ELSIF eHandlerVal = eHandler#SafetyRelay THEN sHL := aHL[1]; END_IF;

With this the hope is that I only have one button defined in HMI and it can load a page internally for me and I can just update my dictionary with more and more options.

image.png
image.png1000×258 55.2 KB
(as opposed to countless buttons that I have to say specifically load page → eltek, load page → safety and show them dependent on different scenarios)

My questions are:

  1. Even though its set to open the same window it opens a new page, so I am likely to end up with many windows open - is there a way to force it to really be the same window?
  2. The url stays at my hard coded state (so even if I click to go to the home page from safety page it does go to the home page but the url is still 'https://192.168.14.114/ehmi/hmiapp.html?HmiPage=safety.json’ → I think this means that if you reload the page it jumps back here now → how can I ‘clear’ the url neatly?
  3. The back button does not allow me to use it but I think probably because of my url method.. I’m mostly ok with that.
  4. Finally, is there already hmi modular functionality like this that I’ve just missed?
    Thanks!
2

To clarify for question 2 on clearing → If I just have my home button https://192.168.14.114/ehmi/hmiapp.html this works in that it loads the home page but have the same problem as (1) which is another new window (whether I set window behaviour to new window or same window)