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[GEOS-8571] Autocomplete support for dropdowns with long lists of values
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92 changes: 92 additions & 0 deletions
92
src/web/core/src/main/java/org/geoserver/web/wicket/Select2DropDownChoice.java
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| Original file line number | Original file line | Diff line number | Diff line change |
|---|---|---|---|
| @@ -0,0 +1,92 @@ | |||
| /* (c) 2018 Open Source Geospatial Foundation - all rights reserved | |||
| * This code is licensed under the GPL 2.0 license, available at the root | |||
| * application directory. | |||
| */ | |||
| package org.geoserver.web.wicket; | |||
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| import org.apache.wicket.Component; | |||
| import org.apache.wicket.behavior.Behavior; | |||
| import org.apache.wicket.markup.head.IHeaderResponse; | |||
| import org.apache.wicket.markup.head.JavaScriptHeaderItem; | |||
| import org.apache.wicket.markup.head.OnLoadHeaderItem; | |||
| import org.apache.wicket.markup.html.form.DropDownChoice; | |||
| import org.apache.wicket.markup.html.form.IChoiceRenderer; | |||
| import org.apache.wicket.model.IModel; | |||
| import org.apache.wicket.request.resource.PackageResourceReference; | |||
| import org.wicketstuff.select2.Select2Behavior; | |||
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| import java.util.List; | |||
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| /** | |||
| * Auto-complete version of a {@link org.apache.wicket.markup.html.form.DropDownChoice} | |||
| */ | |||
| public class Select2DropDownChoice<T> extends DropDownChoice<T> { | |||
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| private static final PackageResourceReference SELECT2_KEYBOARD_JS = new PackageResourceReference( | |||
| Select2DropDownChoice.class, "js/select2/select2-keyboard.js"); | |||
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| public Select2DropDownChoice(String id, IModel<T> model, IModel<List<T>> choices, IChoiceRenderer<T> renderer) { | |||
| super(id, model, choices, renderer); | |||
| initBehaviors(); | |||
| } | |||
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| public Select2DropDownChoice(String id, IModel<T> model, List<T> choices, IChoiceRenderer<T> renderer) { | |||
| super(id, model, choices, renderer); | |||
| initBehaviors(); | |||
| } | |||
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| public Select2DropDownChoice(String id, List<? extends T> choices) { | |||
| super(id, choices); | |||
| initBehaviors(); | |||
| } | |||
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| public Select2DropDownChoice(String id, List<? extends T> choices, IChoiceRenderer<? super T> renderer) { | |||
| super(id, choices, renderer); | |||
| initBehaviors(); | |||
| } | |||
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| public Select2DropDownChoice(String id, IModel<T> model, List<? extends T> choices) { | |||
| super(id, model, choices); | |||
| initBehaviors(); | |||
| } | |||
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| public Select2DropDownChoice(String id, IModel<? extends List<? extends T>> choices) { | |||
| super(id, choices); | |||
| initBehaviors(); | |||
| } | |||
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| public Select2DropDownChoice(String id, IModel<T> model, IModel<? extends List<? extends T>> choices) { | |||
| super(id, model, choices); | |||
| initBehaviors(); | |||
| } | |||
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| public Select2DropDownChoice(String id, IModel<? extends List<? extends T>> choices, IChoiceRenderer<? super T> | |||
| renderer) { | |||
| super(id, choices, renderer); | |||
| initBehaviors(); | |||
| } | |||
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| private void initBehaviors() { | |||
| add(new Select2Behavior()); | |||
| add(new KeyboardBehavior()); | |||
| } | |||
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| /** | |||
| * Mimics keyboard behavior of native drop down choices | |||
| */ | |||
| private static class KeyboardBehavior extends Behavior { | |||
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| public KeyboardBehavior() { | |||
| } | |||
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| public void renderHead(Component component, IHeaderResponse response) { | |||
| super.renderHead(component, response); | |||
| response.render(JavaScriptHeaderItem.forReference(SELECT2_KEYBOARD_JS)); | |||
| String enabler = "enableSelect2Keyboard('" + component.getMarkupId() + "');"; | |||
| response.render(OnLoadHeaderItem.forScript(enabler)); | |||
| } | |||
| } | |||
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| } | |||
105 changes: 105 additions & 0 deletions
105
src/web/core/src/main/java/org/geoserver/web/wicket/js/select2/select2-keyboard.js
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| Original file line number | Original file line | Diff line number | Diff line change |
|---|---|---|---|
| @@ -0,0 +1,105 @@ | |||
| /* (c) 2018 Open Source Geospatial Foundation - all rights reserved | |||
| * This code is licensed under the GPL 2.0 license, available at the root | |||
| * application directory. | |||
| */ | |||
|
|
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| function isCharacterKeyPress(evt) { | |||
| if (typeof evt.which == "undefined") { | |||
| // This is IE, which only fires keypress events for printable keys | |||
| return true; | |||
| } else if (typeof evt.which == "number" && evt.which > 0) { | |||
| // In other browsers except old versions of WebKit, evt.which is | |||
| // only greater than zero if the keypress is a printable key. | |||
| // We need to filter out non printable chars and ctrl/alt/meta key combinations | |||
| return !evt.ctrlKey && !evt.metaKey && !evt.altKey && evt.which > 32; | |||
| } | |||
| return false; | |||
| } | |||
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| function enableSelect2Keyboard(dropDownId) { | |||
| var dropDown = $('#' + dropDownId); | |||
| var s2Obj = dropDown.data('select2'); | |||
| delete s2Obj.listeners.keypress; | |||
| s2Obj.on('keypress', function (evt) { | |||
| var key = evt.which; | |||
| var KEYS = { | |||
| BACKSPACE: 8, | |||
| TAB: 9, | |||
| ENTER: 13, | |||
| SHIFT: 16, | |||
| CTRL: 17, | |||
| ALT: 18, | |||
| ESC: 27, | |||
| SPACE: 32, | |||
| PAGE_UP: 33, | |||
| PAGE_DOWN: 34, | |||
| END: 35, | |||
| HOME: 36, | |||
| LEFT: 37, | |||
| UP: 38, | |||
| RIGHT: 39, | |||
| DOWN: 40, | |||
| DELETE: 46 | |||
| }; | |||
| if (this.isOpen()) { | |||
| if (key === KEYS.ENTER) { | |||
| this.trigger('results:select'); | |||
| evt.preventDefault(); | |||
| } else if ((key === KEYS.SPACE && evt.ctrlKey)) { | |||
| this.trigger('results:toggle'); | |||
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| evt.preventDefault(); | |||
| } else if (key === KEYS.UP) { | |||
| this.trigger('results:previous'); | |||
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| evt.preventDefault(); | |||
| } else if (key === KEYS.DOWN) { | |||
| this.trigger('results:next'); | |||
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| evt.preventDefault(); | |||
| } else if (key === KEYS.ESC || key === KEYS.TAB) { | |||
| this.close(); | |||
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| evt.preventDefault(); | |||
| } | |||
| } else { | |||
| if (key === KEYS.ENTER || key === KEYS.SPACE || | |||
| ((key === KEYS.DOWN || key === KEYS.UP) && evt.altKey)) { | |||
| this.open(); | |||
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| evt.preventDefault(); | |||
| } else if (key === KEYS.DOWN) { | |||
| var val = s2Obj.$element.find('option:selected').next().val(); | |||
| if (undefined !== val) { | |||
| s2Obj.$element.val(val); | |||
| s2Obj.$element.trigger('change'); | |||
| } | |||
| evt.preventDefault(); | |||
| } else if (key === KEYS.UP) { | |||
| if (undefined != this.$element.find('option:selected').prev().val()) { | |||
| this.$element.val(this.$element.find('option:selected').prev().val()); | |||
| this.$element.trigger('change'); | |||
| } | |||
| evt.preventDefault(); | |||
| } else if (isCharacterKeyPress(evt)) { | |||
| // mimics typing in directly by matching the first letter typed (a browser collects | |||
| // all typed chars and allows going beyond first letter) | |||
| var option = this.$element.find('option').first(); | |||
| var theChar = String.fromCharCode(key).toLowerCase() | |||
| while (undefined != option.val() && option.text().toLowerCase().indexOf(theChar) !== 0) { | |||
| option = option.next() | |||
| } | |||
| if (undefined != option.val()) { | |||
| this.$element.val(option.val()); | |||
| this.$element.trigger('change'); | |||
| } | |||
| evt.preventDefault(); | |||
| } | |||
| } | |||
| } | |||
| ); | |||
|
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| s2Obj.on('close', function () { | |||
| this.$element.trigger('focus'); | |||
| }); | |||
| } | |||
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