Element Property Mutations

Search…
add_css_class
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.
1
add_css_class(
2
  batch:      String,          # [null]   - add the operation to a named batch
3
  cancel:     Boolean,         # [false]  - cancel the operation (for use on client)
4
  delay:      Integer,         # [0]      - wait for n milliseconds before running
5
  name:       String or Array, # [null]   - CSS class name(s) to add
6
  select_all: Boolean,         # [false]  - operate on list of elements returned from selector
7
  selector:   String,          # required - string containing a CSS selector or XPath expression
8
  xpath:      Boolean          # [false]  - process the selector as an XPath expression
9
)
Copied!
Life-cycle Callback Events
cable-ready:before-add-css-class
cable-ready:after-add-css-class
Reference
​https://developer.mozilla.org/en-US/docs/Web/API/Element/classList​
remove_attribute
Removes an attribute from an element.
1
remove_attribute(
2
  batch:      String,  # [null]   - add the operation to a named batch
3
  cancel:     Boolean, # [false]  - cancel the operation (for use on client)
4
  delay:      Integer, # [0]      - wait for n milliseconds before running
5
  name:       String,  # required - the attribute to remove
6
  select_all: Boolean, # [false]  - operate on list of elements returned from selector
7
  selector:   String,  # required - string containing a CSS selector or XPath expression
8
  xpath:      Boolean  # [false]  - process the selector as an XPath expression
9
)
Copied!
Life-cycle Callback Events
cable-ready:before-remove-attribute
cable-ready:after-remove-attribute
Reference
​https://developer.mozilla.org/en-US/docs/Web/API/Element/removeAttribute​
remove_css_class
Removes a CSS class from an element.
Use name as an array to remove multiple classes from the element.
1
remove_css_class(
2
  batch:      String,          # [null]   - add the operation to a named batch
3
  cancel:     Boolean,         # [false]  - cancel the operation (for use on client)
4
  delay:      Integer,         # [0]      - wait for n milliseconds before running
5
  name:       String or Array, # [null]   - CSS class name(s) to remove
6
  select_all: Boolean,         # [false]  - operate on list of elements returned from selector
7
  selector:   String,          # required - string containing a CSS selector or XPath expression
8
  xpath:      Boolean          # [false]  - process the selector as an XPath expression
9
)
Copied!
Life-cycle Callback Events
cable-ready:before-remove-css-class
cable-ready:after-remove-css-class
Reference
​https://developer.mozilla.org/en-US/docs/Web/API/Element/classList​
set_attribute
Sets an attribute on an element.
1
set_attribute(
2
  batch:      String,  # [null]   - add the operation to a named batch
3
  cancel:     Boolean, # [false]  - cancel the operation (for use on client)
4
  delay:      Integer, # [0]      - wait for n milliseconds before running
5
  name:       String,  # required - the attribute to set
6
  select_all: Boolean, # [false]  - operate on list of elements returned from selector
7
  selector:   String,  # required - string containing a CSS selector or XPath expression
8
  value:      String,  # [null]   - the value to assign to the attribute
9
  xpath:      Boolean  # [false]  - process the selector as an XPath expression
10
)
Copied!
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.
Life-cycle Callback Events
cable-ready:before-set-attribute
cable-ready:after-set-attribute
Reference
​https://developer.mozilla.org/en-US/docs/Web/API/Element/setAttribute​
set_dataset_property
Sets an dataset property (data-* attribute) on an element.
1
set_dataset_property(
2
  batch:      String,  # [null]   - add the operation to a named batch
3
  cancel:     Boolean, # [false]  - cancel the operation (for use on client)
4
  delay:      Integer, # [0]      - wait for n milliseconds before running
5
  name:       String,  # required - the property to set, camelCased
6
  select_all: Boolean, # [false]  - operate on list of elements returned from selector
7
  selector:   String,  # required - string containing a CSS selector or XPath expression
8
  value:      String,  # [null]   - the value to assign to the dataset
9
  xpath:      Boolean  # [false]  - process the selector as an XPath expression
10
)
Copied!
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:
1
name: "slideShowIndexValue"
Copied!
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:
1
export default class extends Controller {
2
  static values = { index: Number }
3
​
4
  indexValueChanged() {
5
    this.showSlide(this.indexValue)
6
  }
7
​
8
  // ...
9
}
Copied!
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.
Life-cycle Callback Events
cable-ready:before-set-dataset-property
cable-ready:after-set-dataset-property
Reference
​https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset​
set_property
Sets a valid property on an element to a new value.
1
set_property(
2
  batch:      String,  # [null]   - add the operation to a named batch
3
  cancel:     Boolean, # [false]  - cancel the operation (for use on client)
4
  delay:      Integer, # [0]      - wait for n milliseconds before running
5
  name:       String,  # required - string containing a valid property
6
  select_all: Boolean, # [false]  - operate on list of elements returned from selector
7
  selector:   String,  # required - string containing a CSS selector or XPath expression
8
  value:      String,  # [null]   - the value to assign to the property
9
  xpath:      Boolean  # [false]  - process the selector as an XPath expression
10
)
Copied!
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.
Life-cycle Callback Events
cable-ready:before-set-property
cable-ready:after-set-property
Reference
​https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects​
set_style
Sets a single style on an element.
1
set_style(
2
  batch:      String,  # [null]   - add the operation to a named batch
3
  cancel:     Boolean, # [false]  - cancel the operation (for use on client)
4
  delay:      Integer, # [0]      - wait for n milliseconds before running
5
  name:       String,  # required - the style to set
6
  select_all: Boolean, # [false]  - operate on list of elements returned from selector
7
  selector:   String,  # required - string containing a CSS selector or XPath expression
8
  value:      String,  # [null]   - the value to assign to the style
9
  xpath:      Boolean  # [false]  - process the selector as an XPath expression
10
)
Copied!
Life-cycle Callback Events
cable-ready:before-set-style
cable-ready:after-set-style
Reference
​https://developer.mozilla.org/en-US/docs/Web/API/ElementCSSInlineStyle/style​
set_styles
Sets multiple styles on an element. 
1
set_styles(
2
  batch:      String,  # [null]   - add the operation to a named batch
3
  cancel:     Boolean, # [false]  - cancel the operation (for use on client)
4
  delay:      Integer, # [0]      - wait for n milliseconds before running
5
  select_all: Boolean, # [false]  - operate on list of elements returned from selector
6
  selector:   String,  # required - string containing a CSS selector or XPath expression
7
  styles: {
8
    background: "red",
9
    color: "white"
10
  },
11
  xpath:      Boolean  # [false]  - process the selector as an XPath expression
12
)
Copied!
Life-cycle Callback Events
cable-ready:before-set-styles
cable-ready:after-set-styles
Reference
​https://developer.mozilla.org/en-US/docs/Web/API/ElementCSSInlineStyle/style​
set_value
Sets the value of an element.
1
set_value(
2
  batch:      String,  # [null]   - add the operation to a named batch
3
  cancel:     Boolean, # [false]  - cancel the operation (for use on client)
4
  delay:      Integer, # [0]      - wait for n milliseconds before running
5
  select_all: Boolean, # [false]  - operate on list of elements returned from selector
6
  selector:   Boolean, # required - string containing a CSS selector or XPath expression
7
  value:      String,  # [null]   - the value to assign to the attribute
8
  xpath:      Boolean  # [false]  - process the selector as an XPath expression
9
)
Copied!
Remember, setting the value property of a DOM element will not add or modify any value attribute on the element.
Life-cycle Callback Events
cable-ready:before-set-value
cable-ready:after-set-value
Reference
​https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement​
DOM Mutations
DOM Events
Last modified 5mo ago
Export as PDF
Copy link
Contents