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diff --git a/doc/development/fe_guide/droplab/droplab.md b/doc/development/fe_guide/droplab/droplab.md deleted file mode 100644 index 8f1ecc115fe..00000000000 --- a/doc/development/fe_guide/droplab/droplab.md +++ /dev/null @@ -1,281 +0,0 @@ ---- -stage: none -group: unassigned -info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments ---- - -# DropLab - -A generic dropdown for all of your custom dropdown needs. - -## Usage - -DropLab can be used by adding a `data-dropdown-trigger` HTML attribute. This -attribute allows us to find the "trigger" _(toggle)_ for the dropdown, whether -it's a button, link or input. - -The value of the `data-dropdown-trigger` should be a CSS selector that DropLab -can use to find the trigger's dropdown list. - -You should also add the `data-dropdown` attribute to declare the dropdown list. -The value is irrelevant. - -The DropLab class has no side effects, so you must always call `.init` when the -DOM is ready. `DropLab.prototype.init` takes the same arguments as `DropLab.prototype.addHook`. -If you don't provide any arguments, it globally queries and instantiates all -DropLab-compatible dropdowns. - -```html -<a href="#" data-dropdown-trigger="#list">Toggle</a> - -<ul id="list" data-dropdown> - <!-- ... --> -<ul> -``` - -```javascript -const droplab = new DropLab(); -droplab.init(); -``` - -As noted, we have a "Toggle" link that's declared as a trigger. It provides a -selector to find the dropdown list it should control. - -### Static data - -You can add static list items. - -```html -<a href="#" data-dropdown-trigger="#list">Toggle</a> - -<ul id="list" data-dropdown> - <li>Static value 1</li> - <li>Static value 2</li> -<ul> -``` - -```javascript -const droplab = new DropLab(); -droplab.init(); -``` - -### Explicit instantiation - -You can pass the trigger and list elements as constructor arguments to return a -non-global instance of DropLab using the `DropLab.prototype.init` method. - -```html -<a href="#" id="trigger" data-dropdown-trigger="#list">Toggle</a> - -<ul id="list" data-dropdown> - <!-- ... --> -<ul> -``` - -```javascript -const trigger = document.getElementById('trigger'); -const list = document.getElementById('list'); - -const droplab = new DropLab(); -droplab.init(trigger, list); -``` - -You can also add hooks to an existing DropLab instance using `DropLab.prototype.addHook`. - -```html -<a href="#" data-dropdown-trigger="#auto-dropdown">Toggle</a> -<ul id="auto-dropdown" data-dropdown><!-- ... --><ul> - -<a href="#" id="trigger" data-dropdown-trigger="#list">Toggle</a> -<ul id="list" data-dropdown><!-- ... --><ul> -``` - -```javascript -const droplab = new DropLab(); - -droplab.init(); - -const trigger = document.getElementById('trigger'); -const list = document.getElementById('list'); - -droplab.addHook(trigger, list); -``` - -### Dynamic data - -Adding `data-dynamic` to your dropdown element enables dynamic list -rendering. - -You can template a list item using the keys of the data object provided. Use the -handlebars syntax `{{ value }}` to HTML escape the value. Use the `<%= value %>` -syntax to interpolate the value. Use the `<%= value %>` syntax to evaluate the -value. - -Passing an array of objects to `DropLab.prototype.addData` renders that data -for all `data-dynamic` dropdown lists tracked by that DropLab instance. - -```html -<a href="#" data-dropdown-trigger="#list">Toggle</a> - -<ul id="list" data-dropdown data-dynamic> - <li><a href="#" data-id="{{id}}">{{text}}</a></li> -</ul> -``` - -```javascript -const droplab = new DropLab(); - -droplab.init().addData([{ - id: 0, - text: 'Jacob', -}, { - id: 1, - text: 'Jeff', -}]); -``` - -Alternatively, you can specify a specific dropdown to add this data to by -passing the data as the second argument and the `id` of the trigger element as -the first argument. - -```html -<a href="#" data-dropdown-trigger="#list" id="trigger">Toggle</a> - -<ul id="list" data-dropdown data-dynamic> - <li><a href="#" data-id="{{id}}">{{text}}</a></li> -</ul> -``` - -```javascript -const droplab = new DropLab(); - -droplab.init().addData('trigger', [{ - id: 0, - text: 'Jacob', -}, { - id: 1, - text: 'Jeff', -}]); -``` - -This allows you to mix static and dynamic content, even with one trigger. - -Note the use of scoping regarding the `data-dropdown` attribute to capture both -dropdown lists, one of which is dynamic. - -```html -<input id="trigger" data-dropdown-trigger="#list"> -<div id="list" data-dropdown> - <ul> - <li><a href="#">Static item 1</a></li> - <li><a href="#">Static item 2</a></li> - </ul> - <ul data-dynamic> - <li><a href="#" data-id="{{id}}">{{text}}</a></li> - </ul> -</div> -``` - -```javascript -const droplab = new DropLab(); - -droplab.init().addData('trigger', [{ - id: 0, - text: 'Jacob', -}, { - id: 1, - text: 'Jeff', -}]); -``` - -## Internal selectors - -DropLab adds some CSS classes to help lower the barrier to integration. - -For example: - -- The `droplab-item-selected` CSS class is added to items that have been - selected either by a mouse click or by enter key selection. -- The `droplab-item-active` CSS class is added to items that have been selected - using arrow key navigation. -- You can add the `droplab-item-ignore` CSS class to any item that you don't - want to be selectable. For example, an `<li class="divider"></li>` list - divider element that shouldn't be interactive. - -## Internal events - -DropLab uses some custom events to help lower the barrier to integration. - -For example: - -- The `click.dl` event is fired when an `li` list item has been clicked. It's - also fired when a list item has been selected with the keyboard. It's also - fired when a `HookButton` button is clicked (a registered `button` tag or `a` - tag trigger). -- The `input.dl` event is fired when a `HookInput` (a registered `input` tag - trigger) triggers an `input` event. -- The `mousedown.dl` event is fired when a `HookInput` triggers a `mousedown` - event. -- The `keyup.dl` event is fired when a `HookInput` triggers a `keyup` event. -- The `keydown.dl` event is fired when a `HookInput` triggers a `keydown` event. - -These custom events add a `detail` object to the vanilla `Event` object that -provides some potentially useful data. - -## Plugins - -Plugins are objects that are registered to be executed when a hook is added (when -a DropLab trigger and dropdown are instantiated). - -If no modules API is detected, the library falls back as it does with -`window.DropLab` and adds `window.DropLab.plugins.PluginName`. - -### Usage - -To use plugins, you can pass them in an array as the third argument of -`DropLab.prototype.init` or `DropLab.prototype.addHook`. Some plugins require -configuration values; the configuration object can be passed as the fourth argument. - -```html -<a href="#" id="trigger" data-dropdown-trigger="#list">Toggle</a> -<ul id="list" data-dropdown><!-- ... --><ul> -``` - -```javascript -const droplab = new DropLab(); - -const trigger = document.getElementById('trigger'); -const list = document.getElementById('list'); - -droplab.init(trigger, list, [droplabAjax], { - droplabAjax: { - endpoint: '/some-endpoint', - method: 'setData', - }, -}); -``` - -### Documentation - -Refer to the list of available [DropLab plugins](plugins/index.md) for -information about their use. - -### Development - -When plugins are initialised for a DropLab trigger+dropdown, DropLab calls the -plugins' `init` function, so this must be implemented in the plugin. - -```javascript -class MyPlugin { - static init() { - this.someProp = 'someProp'; - this.someMethod(); - } - - static someMethod() { - this.otherProp = 'otherProp'; - } -} - -export default MyPlugin; -``` |