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Update dropdown.js to allow referenceElement (#25219)

This commit is contained in:
719media 2018-01-21 10:09:23 -08:00 committed by Johann-S
parent a098de125f
commit bd9084d249
3 changed files with 82 additions and 9 deletions
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38
docs/4.0/components/dropdowns.md
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@ -671,6 +671,38 @@ Add `.disabled` to items in the dropdown to **style them as disabled**.
</div>
{% endexample %}
## Dropdown options
Use `data-offset` or `data-reference` to change the location of the dropdown.
{% example html %}
<div class="d-flex">
<div class="dropdown mr-1">
<button type="button" class="btn btn-secondary dropdown-toggle" id="dropdownMenuOffset" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" data-offset="10,20">
Offset
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuOffset">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
<div class="btn-group">
<button type="button" class="btn btn-secondary">Reference</button>
<button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" id="dropdownMenuReference" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" data-reference="parent">
<span class="sr-only">Toggle Dropdown</span>
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuReference">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div>
</div>
{% endexample %}
## Usage
Via data attributes or JavaScript, the dropdown plugin toggles hidden content (dropdown menus) by toggling the `.show` class on the parent list item. The `data-toggle="dropdown"` attribute is relied on for closing dropdown menus at an application level, so it's a good idea to always use it.
@ -740,6 +772,12 @@ Options can be passed via data attributes or JavaScript. For data attributes, ap
<td>'scrollParent'</td>
<td>Overflow constraint boundary of the dropdown menu. Accepts the values of <code>'viewport'</code>, <code>'window'</code>, <code>'scrollParent'</code>, or an HTMLElement reference (JavaScript only). For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#modifiers..preventOverflow.boundariesElement">preventOverflow docs</a>.</td>
</tr>
<tr>
<td>reference</td>
<td>string | element</td>
<td>'toggle'</td>
<td>Reference element of the dropdown menu. Accepts the values of <code>'toggle'</code>, <code>'parent'</code>, or an HTMLElement reference. For more information refer to Popper.js's <a href="https://popper.js.org/popper-documentation.html#referenceObject">referenceObject docs</a>.</td>
</tr>
</tbody>
</table>

25
js/src/dropdown.js
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@ -74,13 +74,15 @@ const Dropdown = (($) => {
const Default = {
offset : 0,
flip : true,
boundary : 'scrollParent'
boundary : 'scrollParent',
reference : 'toggle'
}
const DefaultType = {
offset : '(number|string|function)',
flip : 'boolean',
boundary : '(string|element)'
boundary : '(string|element)',
reference : '(string|element)'
}
/**
@ -150,20 +152,27 @@ const Dropdown = (($) => {
if (typeof Popper === 'undefined') {
throw new TypeError('Bootstrap dropdown require Popper.js (https://popper.js.org)')
}
let element = this._element
// For dropup with alignment we use the parent as popper container
if ($(parent).hasClass(ClassName.DROPUP)) {
if ($(this._menu).hasClass(ClassName.MENULEFT) || $(this._menu).hasClass(ClassName.MENURIGHT)) {
element = parent
let referenceElement = this._element
if (this._config.reference === 'parent') {
referenceElement = parent
} else if (Util.isElement(this._config.reference)) {
referenceElement = this._config.reference
// Check if it's jQuery element
if (typeof this._config.reference.jquery !== 'undefined') {
referenceElement = this._config.reference[0]
}
}
// If boundary is not `scrollParent`, then set position to `static`
// to allow the menu to "escape" the scroll parent's boundaries
// https://github.com/twbs/bootstrap/issues/24251
if (this._config.boundary !== 'scrollParent') {
$(parent).addClass(ClassName.POSITION_STATIC)
}
this._popper = new Popper(element, this._menu, this._getPopperConfig())
this._popper = new Popper(referenceElement, this._menu, this._getPopperConfig())
}
// If this is a touch-enabled device we add extra

28
js/tests/visual/dropdown.html
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@ -161,8 +161,34 @@
</div>
</div>
</div>
</div>
<div class="row">
<div class="col-sm-12 mt-4">
<div class="btn-group dropdown">
<button type="button" class="btn btn-secondary" data-offset="10,20">Dropdown offset</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
</div>
<div class="col-sm-12 mt-4">
<div class="btn-group dropdown">
<button type="button" class="btn btn-secondary">Dropdown reference</button>
<button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" data-reference="parent">
<span class="sr-only">Dropdown split</span>
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
</div>
</div>
</div>
<script src="../../../assets/js/vendor/jquery-slim.min.js"></script>