Button condition: page number

[martina_mangia]

Hello community,

I'd like to show a button only in some pages: it's a "home" button, so you don't really need it if you are altready on the home page. The only conditions I see in the config cockpit concern item value or usergroup. Are there other way to archieve this result? Maybe using a localscript on the home page that makes the button invisible or creating a variable which corresponds to each page.
I'd really appriciate if you could give me some advices, thank you

[HmiGuide · Accepted solution]

• Every WebIQ panel (Screen, Swipe-Panel & Tab-Panel) has the data attributes Item field (marked in picuture below).
• Just insert an item which always is updated with the number of the currently opened panel. 
• Use the item for hiding the home button.
• You can use the item to change the visible panel, too. Just set it, to the screen number you want to display.

[martina_mangia]

Perfect, thank you!

[martina_mangia]

Beg your perdon, I have a futher question. If I want to create this variable, it should be an internal one, not a tag from the PLC, I suppose. Then I should go to the process data manager and create a new one, but how can I manage the logic beside? I mean, I want my new variable to updated with the number of the currently opened panel, how can I make it happen? Sorry for my greenness 😅

[HmiGuide · Accepted solution]

Whether you use a virtual or a PLC item depends on what you want to achieve when the program runs simultaneously on several HMIs.

• use case A With screen coupling: When any HMI changes the screen, the program switches to this screen on all other devices. => Use PLC item.
• use case B - No screen coupling: The screen switching of the HMIs does not influence each other. => Use virtual item

As I wrote, you only have to insert a item into the green marked field above. As soon as an item is inserted WebIQ updates the value of the  item with the current panel number.

[webiq-sk]

Please also note these differences:

• virtual item: JavaScript variable, lives as long and only in the browser tab until the HMI is reloaded in the current browser tab
• internal item: an item managed the same like an OPC-UA item and kept in WebIQ Server where the IO Handler is set to "internal:simulation"
• OPC UA item/external item: an item where the IO Handler is not set to "internal:simulation"

So you are referring to a virtual, not an internal item.

[martina_mangia]

Oh sorry, I didn't get it, now it works. Thank you both very much!