I'm having trouble with an application, where the screens take a long time to redirect. To get around the problem, I created a page with only an iframe, which contains navigation between pages.
The biggest problem is that it is not possible to switch windows faster because they are stored in a Siemens s7-1200 PLC.
Then, the idea of when the user changes pages within the iframe, a message that is loading is displayed.
That is, every time frame content updates , a loading message should appear.
For this I can use JavaScript and html.
Below is the code for the home page:
<iframe id="ifr" src="inicial.html" width="99.8%" border="0" height="800" ></iframe>
Within the iframe, there are menus for navigating to other pages within the iframe.