Element Property Mutations
Adds a CSS class to an element. If the class already exists on the element, callback events will be emitted but no change will occur on the element itself.
Use
name as an array to add multiple classes to the element.add_css_class(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
name: String or Array, # [null] - CSS class name(s) to add
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: String, # required - string containing a CSS selector or XPath expression
xpath: Boolean # [false] - process the selector as an XPath expression
)
cable-ready:before-add-css-classcable-ready:after-add-css-class
Removes an attribute from an element.
remove_attribute(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
name: String, # required - the attribute to remove
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: String, # required - string containing a CSS selector or XPath expression
xpath: Boolean # [false] - process the selector as an XPath expression
)
cable-ready:before-remove-attributecable-ready:after-remove-attribute
Removes a CSS class from an element.
Use
name as an array to remove multiple classes from the element.remove_css_class(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
name: String or Array, # [null] - CSS class name(s) to remove
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: String, # required - string containing a CSS selector or XPath expression
xpath: Boolean # [false] - process the selector as an XPath expression
)
cable-ready:before-remove-css-classcable-ready:after-remove-css-class
Sets an attribute on an element.
set_attribute(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
name: String, # required - the attribute to set
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: String, # required - string containing a CSS selector or XPath expression
value: String, # [null] - the value to assign to the attribute
xpath: Boolean # [false] - process the selector as an XPath expression
)
Setting an attribute changes the element's HTML, and you will see it reflected in your browser's element inspector. Conversely, properties reflect the live state of the DOM element created by interpreting the HTML.
While there is frequently a 1:1 mapping between attributes and properties, there is a long list of gotchas. For example, changing the
value attribute of a text input element does not change the current value property, or vice versa. Many debugging sessions conclude with frustration over the many attribute vs property gotchas. To set the value of a Boolean attribute, such as
disabled, you can specify any value. An empty string or the name of the attribute are recommended values. All that matters is that if the attribute is present at all, regardless of its actual value, its value is considered to be true. The absence of the attribute means its value is false. By setting the value of the disabled attribute to the empty string (""), we are setting disabled to true, which results in the button being disabled.cable-ready:before-set-attributecable-ready:after-set-attribute
Sets an dataset property (data-* attribute) on an element.
set_dataset_property(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
name: String, # required - the property to set, camelCased
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: String, # required - string containing a CSS selector or XPath expression
value: String, # [null] - the value to assign to the dataset
xpath: Boolean # [false] - process the selector as an XPath expression
)
The
name parameter must be passed as camelCase and without the data- prefix. If you have an index value defined on a Stimulus controller called slide-show, you will need to set:name: "slideShowIndexValue"
This method pairs extremely well with the new Values API in Stimulus 2, which allows you to specify certain dataset properties to monitor for changes. In addition to providing an excellent way to pass initialization settings to a controller, Stimulus will also execute a special callback if the dataset value is changed:
export default class extends Controller {
static values = { index: Number }
indexValueChanged() {
this.showSlide(this.indexValue)
}
// ...
}
This technique can be seen in action in the stimulus-hotkeys package. CableReady can be used to dynamically upset the user's keyboard shortcuts based on personal preferences in real-time, which is pretty damn cool.
cable-ready:before-set-dataset-propertycable-ready:after-set-dataset-property
Sets a valid property on an element to a new value.
set_property(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
name: String, # required - string containing a valid property
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: String, # required - string containing a CSS selector or XPath expression
value: String, # [null] - the value to assign to the property
xpath: Boolean # [false] - process the selector as an XPath expression
)
As discussed in the
set_attribute description above, properties are the run-time characteristics of HTML that has been parsed and converted to a DOM element.There are many concepts from the HTML markup that don't map cleanly to the JS representation - such as
class vs. className for CSS classes - since class is a reserved word in Javascript.While DOM elements have many standard properties, you can assign additional properties arbitrarily so long as you don't conflict with an existing property. This technique is known as "hanging" variables on DOM elements, and can be a very powerful tool. Remember: it's possible to hang variables off
document and window if need be.cable-ready:before-set-propertycable-ready:after-set-property
Sets a single style on an element.
set_style(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
name: String, # required - the style to set
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: String, # required - string containing a CSS selector or XPath expression
value: String, # [null] - the value to assign to the style
xpath: Boolean # [false] - process the selector as an XPath expression
)
cable-ready:before-set-stylecable-ready:after-set-style
Sets multiple styles on an element.
set_styles(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: String, # required - string containing a CSS selector or XPath expression
styles: {
background: "red",
color: "white"
},
xpath: Boolean # [false] - process the selector as an XPath expression
)
cable-ready:before-set-stylescable-ready:after-set-styles
Sets the value of an element.
set_value(
batch: String, # [null] - add the operation to a named batch
cancel: Boolean, # [false] - cancel the operation (for use on client)
delay: Integer, # [0] - wait for n milliseconds before running
select_all: Boolean, # [false] - operate on list of elements returned from selector
selector: Boolean, # required - string containing a CSS selector or XPath expression
value: String, # [null] - the value to assign to the attribute
xpath: Boolean # [false] - process the selector as an XPath expression
)
Remember, setting the
value property of a DOM element will not add or modify any value attribute on the element.cable-ready:before-set-valuecable-ready:after-set-value
Last modified 1yr ago