Using coding techniques to switch on and off the collapse feature of Bootstrap 5 component

Question

Using coding techniques to switch on and off the collapse feature of Bootstrap 5 component

Utilizing the Bootstrap 5 "collapse" feature, I am implementing it using the data attributes method. Everything works perfectly as intended - I can simply click the button to collapse or expand the collapsible items.

According to the documentation, I should be able to manually toggle the state with the following code:

let element = document.querySelector('#my-collapse');
bootstrap.Collapse.getInstance(element).toggle();

Unfortunately, this approach fails because the getInstance method returns null.

Oddly enough, if I first click on the collapse button and then execute the code, it miraculously works.

Is there a way to ensure that the code functions correctly without having to "prime" the collapse component beforehand?

javascript twitter-bootstrap bootstrap-5

Answer 1

Answer №1

My observation is that the bootstrap component is dynamically generated upon demand when data attributes are utilized - specifically triggered by the first click on the collapse button. This explains the behavior mentioned earlier.

To address this issue, it is recommended to utilize getOrCreateInstance instead:

let target = document.querySelector('#my-collapse');
bootstrap.Collapse.getOrCreateInstance(target).toggle();

Answer 2

My observation is that the bootstrap component is dynamically generated upon demand when data attributes are utilized - specifically triggered by the first click on the collapse button. This explains the behavior mentioned earlier.

To address this issue, it is recommended to utilize getOrCreateInstance instead:

let target = document.querySelector('#my-collapse');
bootstrap.Collapse.getOrCreateInstance(target).toggle();

Answer 3

Answer №2

This piece of code ensures that the collapse instance is not null:

let target = document.querySelector('#my-collapse');
// check if collapse instance exists
let bsCollapseInstance = bootstrap.Collapse.getInstance(target);
// create new collapse instance if it doesn't exist yet
if (bsCollapseInstance === null) {
    bsCollapseInstance = new bootstrap.Collapse(target, {
        toggle: false   // make sure to include this parameter!
    })
}
bsCollapseInstance.show();

Answer 4

This piece of code ensures that the collapse instance is not null:

let target = document.querySelector('#my-collapse');
// check if collapse instance exists
let bsCollapseInstance = bootstrap.Collapse.getInstance(target);
// create new collapse instance if it doesn't exist yet
if (bsCollapseInstance === null) {
    bsCollapseInstance = new bootstrap.Collapse(target, {
        toggle: false   // make sure to include this parameter!
    })
}
bsCollapseInstance.show();

Answer 5

Answer №3

The Bootstrap Collapse component by default initiates an 'auto-toggle' function upon instantiation.

To prevent this initial toggling behavior, you can use the following configuration:

let element = document.querySelector('#my-collapse');
bootstrap.Collapse.getOrCreateInstance(element, { toggle: false });

For more information, refer to https://github.com/twbs/bootstrap/blob/688bce4fa695cc360a0d084e34f029b0c192b223/js/src/collapse.js#L97-L99

    if (this._config.toggle) {
      this.toggle()
    }

Answer 6

The Bootstrap Collapse component by default initiates an 'auto-toggle' function upon instantiation.

To prevent this initial toggling behavior, you can use the following configuration:

let element = document.querySelector('#my-collapse');
bootstrap.Collapse.getOrCreateInstance(element, { toggle: false });

For more information, refer to https://github.com/twbs/bootstrap/blob/688bce4fa695cc360a0d084e34f029b0c192b223/js/src/collapse.js#L97-L99

    if (this._config.toggle) {
      this.toggle()
    }

Using coding techniques to switch on and off the collapse feature of Bootstrap 5 component

Answer №1

Answer №2

Answer №3

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