The initialization of the R Shiny HTML canvas does not occur until the page is resized

Question

The initialization of the R Shiny HTML canvas does not occur until the page is resized

I am currently facing an issue while integrating an HTML page with a canvas into my shiny R application using includeHTML(). The packages I am using are shiny, shinydashboard, shinycssloaders, dplyr, and DT.

Everything is working perfectly fine except for the fact that the canvas is not getting initialized and just shows up as a white square with HTML properties.

The canvas code looks like this: width="0" height="0" style="width: 0px; height: 0px;"></canvas

Interestingly, when I open Chrome inspect or resize my browser window, the canvas suddenly appears with these properties:

width="592" height="353" style="width: 591.5px; height: 353.297px;"></canvas

Is there a possible solution to fix this problem such as refreshing the canvas or simulating the resizing effect?

I have already attempted removing all CSS and comparing the HTML before and after resizing, but unfortunately, nothing has been successful so far.

javascript html css shiny html5-canvas

Answer 1

Answer №1

Try triggering the resize event using some JavaScript code such as this:

js <- "
$(document).ready(function(){
  window.dispatchEvent(new Event('resize'));
});
"

Include this code in your Shiny UI:

ui <- fluidPage(
  tags$head(tags$script(HTML(js))),
  ......
)

EDIT

Based on your feedback, if the above code doesn't work, you can try:

js <- "
$(document).ready(function(){
  setTimeout(function(){window.dispatchEvent(new Event('resize'));}, 0);
});
"

or

js <- "
$(document).on('shiny:connected', function(){
  setTimeout(function(){window.dispatchEvent(new Event('resize'));}, 0);
});
"

Answer 2

Try triggering the resize event using some JavaScript code such as this:

js <- "
$(document).ready(function(){
  window.dispatchEvent(new Event('resize'));
});
"

Include this code in your Shiny UI:

ui <- fluidPage(
  tags$head(tags$script(HTML(js))),
  ......
)

EDIT

Based on your feedback, if the above code doesn't work, you can try:

js <- "
$(document).ready(function(){
  setTimeout(function(){window.dispatchEvent(new Event('resize'));}, 0);
});
"

or

js <- "
$(document).on('shiny:connected', function(){
  setTimeout(function(){window.dispatchEvent(new Event('resize'));}, 0);
});
"

The initialization of the R Shiny HTML canvas does not occur until the page is resized

Answer №1

EDIT

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