Elenco a discesa Bootstrap JS
Classi CSS a discesa
Per un tutorial sui Dropdown, leggi il nostro Tutorial sui Dropdown Bootstrap .
| Class | Description | Example |
|---|---|---|
.dropdown |
Indicates a dropdown menu | |
.dropdown-item |
Style links inside the dropdown menu with proper padding etc | |
.dropdown-item-text |
Style text or text links inside the dropdown menu with proper padding etc | |
.dropdown-menu |
Builds the dropdown menu | |
.dropdown-menu-right |
Right-aligns a dropdown menu | |
.dropdown-header |
Adds a header inside the dropdown menu | |
.dropup |
Indicates a dropup menu | |
.disabled |
Disables an item in the dropdown menu | |
.active |
Styles the active element in a dropdown menu | |
.divider |
Separates items inside the dropdown menu with a horizontal line |
Via dati-* Attributi
Aggiungi data-toggle="dropdown"a un collegamento o un pulsante per attivare un menu a discesa.
Esempio
<button type="button" class="dropdown-toggle"
data-toggle="dropdown">Dropdown Example</button>
Tramite JavaScript
Abilita manualmente con:
Esempio
$('.dropdown-toggle').dropdown();
Nota: l'attributo data-toggle="dropdown" è obbligatorio indipendentemente dal fatto che tu chiami il metodo dropdown().
Opzioni a discesa
| None |
Metodi a discesa
La tabella seguente elenca tutti i metodi a discesa disponibili.
| Method | Description | Try it |
|---|---|---|
| .dropdown("toggle") | Toggles the dropdown. If set, it will open the dropdown menu by default | |
| .dropdown("update") | Updates the position of an element's dropdown | |
| .dropdown("dispose") | Destroys an element's dropdown |
Eventi a discesa
La tabella seguente elenca tutti gli eventi a discesa disponibili.
| Event | Description | Try it |
|---|---|---|
| show.bs.dropdown | Occurs when the dropdown is about to be shown. | |
| shown.bs.dropdown | Occurs when the dropdown is fully shown (after CSS transitions have completed) | |
| hide.bs.dropdown | Occurs when the dropdown is about to be hidden | |
| hidden.bs.dropdown | Occurs when the dropdown is fully hidden (after CSS transitions have completed) |
Suggerimento: usa event.relatedTarget di jQuery per ottenere l'elemento che ha attivato il menu a discesa:
Esempio
$(".dropdown").on("show.bs.dropdown", function(event){
var x = $(event.relatedTarget).text(); // Get the text of the element
alert(x);
});