Description Usage Arguments Note See Also Examples
Add or remove a CSS class from an HTML element.
addClass
adds a CSS class, removeClass
removes a CSS class, toggleClass
adds the class if it is
not set and removes the class if it is already set.
addCssClass
, removeCssClass
, and
toggleCssClass
are synonyms that may be safer to use if you're
working with S4 classes (since they don't mask any existing S4 functions).
If condition
is given to toggleClass
, that condition will be used
to determine if to add or remove the class. The class will be added if the
condition evaluates to TRUE
and removed otherwise. If you find
yourself writing code such as if (test()) addClass(id, cl) else removeClass(id, cl)
then you can use toggleClass
instead: toggleClass(id, cl, test())
.
CSS is a simple way to describe how elements on a web page should be
displayed (position, colour, size, etc.). You can learn the basics
at W3Schools.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | addClass(id = NULL, class = NULL, selector = NULL, asis = FALSE)
addCssClass(id = NULL, class = NULL, selector = NULL, asis = FALSE)
removeClass(id = NULL, class = NULL, selector = NULL, asis = FALSE)
removeCssClass(id = NULL, class = NULL, selector = NULL, asis = FALSE)
toggleClass(
id = NULL,
class = NULL,
condition = NULL,
selector = NULL,
asis = FALSE
)
toggleCssClass(
id = NULL,
class = NULL,
condition = NULL,
selector = NULL,
asis = FALSE
)
|
id |
The id of the element/Shiny tag |
class |
The CSS class to add/remove |
selector |
JQuery selector of the elements to target. Ignored if the |
asis |
If |
condition |
An optional argument to |
If you use S4 classes, you should be aware of the fact that both S4 and
shinyjs
use the removeClass()
function. This means that when using S4,
it is recommended to use removeCssClass()
from shinyjs
, and to
use methods::removeClass()
for S4 object.
shinyjs
must be initialized with a call to useShinyjs()
in the app's ui.
useShinyjs
,
runExample
,
inlineCSS
,
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | if (interactive()) {
library(shiny)
shinyApp(
ui = fluidPage(
useShinyjs(), # Set up shinyjs
# Add a CSS class for red text colour
inlineCSS(list(.red = "background: red")),
actionButton("btn", "Click me"),
p(id = "element", "Watch what happens to me")
),
server = function(input, output) {
observeEvent(input$btn, {
# Change the following line for more examples
toggleClass("element", "red")
})
}
)
}
## Not run:
# The shinyjs function call in the above app can be replaced by
# any of the following examples to produce similar Shiny apps
toggleClass(class = "red", id = "element")
addClass("element", "red")
removeClass("element", "red")
## End(Not run)
## toggleClass can be given an optional `condition` argument, which
## determines if to add or remove the class
if (interactive()) {
shinyApp(
ui = fluidPage(
useShinyjs(),
inlineCSS(list(.red = "background: red")),
checkboxInput("checkbox", "Make it red"),
p(id = "element", "Watch what happens to me")
),
server = function(input, output) {
observe({
toggleClass(id = "element", class = "red",
condition = input$checkbox)
})
}
)
}
|
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