Wt

Korneel Dumon wrote in #note-1:

Hi,

could be a few things. Do you see the style-class in the browser debugger? Or do you think triggerUpdate() does nothing?

To make server updates, you need to do a few things:

• call WApplication::enableUpdates() before-hand to make sure Wt keeps an open line to the client
• grab the update-lock (or use WServer::post)
• triggerUpdate() as you do

See also: https://webtoolkit.eu/wt/doc/reference/html/classWt_1_1WApplication.html#ad9631ca64e68d30d40cb49c90e55223d

I see the style is not changed. It's always as initiated(progress bg-info-polytec). But other properties are updated Like the progress value.

It seems WProgressBar::setValueStyleClass() is not part of the public API (as it is not documented). After checking the code, I noticed that this function
does not trigger a repaint, which explains the behavior you see.

You're better off changing the style class on progress bar itself and making style rules that combine classes.

Korneel Dumon wrote in #note-3:

It seems WProgressBar::setValueStyleClass() is not part of the public API (as it is not documented). After checking the code, I noticed that this function
does not trigger a repaint, which explains the behavior you see.

You're better off changing the style class on progress bar itself and making style rules that combine classes.

I am not sure if I understood your properly. Can you give me bit hint what you mean by making style rule?

I tried using the setStyleClass. But the danger color looks goes to the background.

auto style = m_velocityModel.Overrange() ? "bg-danger" : "bg-info";
m_velocityProgressBar->setStyleClass(style);

The style-rule should be something like:

.bg-danger .progress-bar { background-color: red; }
.bg-info .progress-bar { background-color: green; }

Note that I didn't test this, just trying to show you the idea.