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Copy pathkendo.virtuallist.js
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kendo.virtuallist.js
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import "./kendo.data.js";
import { valueMapperOptions } from "./utils/valueMapper.js";
export const __meta__ = {
id: "virtuallist",
name: "VirtualList",
category: "framework",
depends: [ "data" ],
hidden: true
};
(function($, undefined) {
var kendo = window.kendo,
ui = kendo.ui,
encode = kendo.htmlEncode,
Widget = ui.Widget,
DataBoundWidget = ui.DataBoundWidget,
percentageUnitsRegex = /^\d+(\.\d+)?%$/i,
LIST_CONTENT = "k-list-content k-virtual-content",
TABLE_CONTENT = "k-table-body k-table-scroller",
HEADER = "k-list-group-sticky-header",
LIST_ITEM = "k-list-item",
TABLE_ITEM = "k-table-row",
HEIGHTCONTAINER = "k-height-container",
GROUPITEM = "k-list-item-group-label",
LIST_UL = "k-list-ul",
TABLE_LIST = "k-table-list",
SELECTED = "k-selected",
FOCUSED = "k-focus",
HOVER = "k-hover",
CHANGE = "change",
CLICK = "click",
LISTBOUND = "listBound",
ITEMCHANGE = "itemChange",
ACTIVATE = "activate",
DEACTIVATE = "deactivate",
GROUP_ROW_SEL = ".k-table-group-row",
VIRTUAL_LIST_NS = ".VirtualList";
function lastFrom(array) {
return array[array.length - 1];
}
function toArray(value) {
return value instanceof Array ? value : [value];
}
function isPrimitive(dataItem) {
return typeof dataItem === "string" || typeof dataItem === "number" || typeof dataItem === "boolean";
}
function getItemCount(screenHeight, listScreens, itemHeight) {
return Math.ceil(screenHeight * listScreens / itemHeight);
}
function appendChild(parent, className, tagName) {
var element = document.createElement(tagName || "div");
if (className) {
element.className = className;
}
parent.appendChild(element);
return element;
}
function getDefaultItemHeight(listSize) {
var mockList = $('<div class="k-list ' + listSize + ' k-virtual-list">' +
'<div class="k-list-content k-virtual-content">' +
'<ul class="k-list-ul">' +
'<li class="k-list-item">' +
'<span class="k-list-item-text">test</span>' +
'</li>' +
'</ul>' +
'</div>' +
'</div>');
var lineHeight;
mockList.css({
position: "absolute",
left: "-200000px",
visibility: "hidden"
});
mockList.appendTo(document.body);
lineHeight = parseFloat(kendo.getComputedStyles(mockList.find(".k-list-item")[0], ["height"]).height);
mockList.remove();
return lineHeight;
}
function bufferSizes(screenHeight, listScreens, opposite) { //in pixels
return {
down: screenHeight * opposite,
up: screenHeight * (listScreens - 1 - opposite)
};
}
function listValidator(options, screenHeight) {
var downThreshold = (options.listScreens - 1 - options.threshold) * screenHeight;
var upThreshold = options.threshold * screenHeight;
return function(list, scrollTop, lastScrollTop) {
if (scrollTop > lastScrollTop) {
return scrollTop - list.top < downThreshold;
} else {
return list.top === 0 || scrollTop - list.top > upThreshold;
}
};
}
function scrollCallback(element, callback) {
return function(force) {
return callback(element.scrollTop, force);
};
}
function syncList(reorder) {
return function(list, force) {
reorder(list.items, list.index, force);
return list;
};
}
function position(element, y) {
element.style.webkitTransform = 'translateY(' + y + "px)";
element.style.transform = 'translateY(' + y + "px)";
}
function map2(callback, templates) {
return function(arr1, arr2) {
for (var i = 0, len = arr1.length; i < len; i++) {
callback(arr1[i], arr2[i], templates);
if (arr2[i].item) {
this.trigger(ITEMCHANGE, { item: $(arr1[i]), data: arr2[i].item, ns: kendo.ui });
}
}
};
}
function reshift(items, diff) {
var range;
if (diff > 0) { // down
range = items.splice(0, diff);
items.push.apply(items, range);
} else { // up
range = items.splice(diff, -diff);
items.unshift.apply(items, range);
}
return range;
}
function render(element, data, templates) {
var itemTemplate = templates.template,
hasColumns = this.options.columns && this.options.columns.length,
altRow = data.index % 2 === 1 ? "k-table-alt-row" : "";
element = $(element);
if (!data.item) {
itemTemplate = templates.placeholderTemplate;
}
if (data.index === 0 && this.header && data.group) {
this.header.html(templates.fixedGroupTemplate(data.group));
}
element
.attr("data-uid", data.item ? data.item.uid : "")
.attr("data-offset-index", data.index);
if (hasColumns && data.item) {
if (altRow.length > 0) {
element.addClass(altRow);
} else {
element.removeClass("k-table-alt-row");
}
let renderedColumns = $(renderColumns(this.options, data.item, templates));
kendo.applyStylesFromKendoAttributes(renderedColumns, ["width", "max-width"]);
element.empty().append(renderedColumns);
} else {
element.find("." + GROUPITEM).remove();
element.find(".k-list-item-text").html(itemTemplate(data.item || {}));
}
element.toggleClass(FOCUSED, data.current);
element.toggleClass(SELECTED, data.selected);
element.toggleClass("k-first", data.newGroup);
element.toggleClass("k-last", data.isLastGroupedItem);
element.toggleClass("k-loading-item", !data.item);
if (data.index !== 0 && data.newGroup) {
if (hasColumns) {
$('<span class="k-table-td k-table-group-td"><span>' + templates.groupTemplate(data.group) + '</span></span>')
.appendTo(element);
} else {
$("<div class=" + GROUPITEM + "></div>")
.appendTo(element)
.html(templates.groupTemplate(data.group));
}
} else if (data.group && hasColumns) {
element.append($('<span class="k-table-td k-table-spacer-td"></span>'));
}
if (data.top !== undefined) {
position(element[0], data.top);
}
}
function renderColumns(options, dataItem, templates) {
var item = "";
for (var i = 0; i < options.columns.length; i++) {
var currentWidth = options.columns[i].width;
var currentWidthInt = parseInt(currentWidth, 10);
var widthStyle = '';
if (currentWidth) {
let widthValue = `${currentWidthInt}${percentageUnitsRegex.test(currentWidth) ? "%" : "px"}`;
widthStyle = `${kendo.attr("style-width")}="${widthValue}" ${kendo.attr("style-max-width")}="${widthValue}"`;
}
item += "<span class='k-table-td' " + widthStyle + ">";
item += templates["column" + i](dataItem);
item += "</span>";
}
return item;
}
function mapChangedItems(selected, itemsToMatch) {
var itemsLength = itemsToMatch.length;
var selectedLength = selected.length;
var dataItem;
var found;
var i, j;
var changed = [];
var unchanged = [];
if (selectedLength) {
for (i = 0; i < selectedLength; i++) {
dataItem = selected[i];
found = false;
for (j = 0; j < itemsLength; j++) {
if (dataItem === itemsToMatch[j]) {
found = true;
changed.push({ index: i, item: dataItem });
break;
}
}
if (!found) {
unchanged.push(dataItem);
}
}
}
return {
changed: changed,
unchanged: unchanged
};
}
function isActivePromise(promise) {
return promise && promise.state() !== "resolved";
}
var VirtualList = DataBoundWidget.extend({
init: function(element, options) {
var that = this,
contentClasses = options.columns && options.columns.length ? TABLE_CONTENT : LIST_CONTENT;
that.bound(false);
that._fetching = false;
Widget.fn.init.call(that, element, options);
if (!that.options.itemHeight) {
that.options.itemHeight = getDefaultItemHeight(options.listSize);
}
options = that.options;
that.element.attr("role", "listbox");
var contentSelector = "." + contentClasses.split(' ').join('.');
var wrapper = that.element.closest(contentSelector);
that.content = that.wrapper = wrapper.length ? wrapper : that.element.wrap("<div unselectable='on' class='" + contentClasses + "'></div>").parent();
if (that.options.columns && that.options.columns.length) {
var thead = that.element.closest(".k-data-table").find('.k-table-thead');
var row = $('<tr class="k-table-group-row">' +
'<th class="k-table-th" colspan="' + that.options.columns.length + '"></th>' +
'</tr>');
thead.append(row);
that.header = row.find(".k-table-th");
that.element.addClass(TABLE_LIST + " k-virtual-table");
} else {
that.header = that.content.before("<div class='" + HEADER + "'></div>").prev();
that.element.addClass(LIST_UL);
}
if (options.ariaLabel) {
this.element.attr("aria-label", options.ariaLabel);
} else if (options.ariaLabelledBy) {
this.element.attr("aria-labelledby", options.ariaLabelledBy);
}
that.element.on("mouseenter" + VIRTUAL_LIST_NS, "li:not(.k-loading-item)", function() { $(this).addClass(HOVER); })
.on("mouseleave" + VIRTUAL_LIST_NS, "li", function() { $(this).removeClass(HOVER); });
that._values = toArray(that.options.value);
that._selectedDataItems = [];
that._selectedIndexes = [];
that._rangesList = {};
that._promisesList = [];
that._optionID = kendo.guid();
that._templates();
that.setDataSource(options.dataSource);
that.content.on("scroll" + VIRTUAL_LIST_NS, kendo.throttle(function() {
that._renderItems();
that._triggerListBound();
}, options.delay));
that._selectable();
},
options: {
name: "VirtualList",
autoBind: true,
delay: 100,
height: null,
listScreens: 4,
threshold: 0.5,
itemHeight: null,
oppositeBuffer: 1,
type: "flat",
selectable: false,
value: [],
dataValueField: null,
template: (data) => encode(data),
placeholderTemplate: () => "loading...",
groupTemplate: (data) => encode(data),
fixedGroupTemplate: (data) => encode(data),
mapValueTo: "index",
valueMapper: null,
ariaLabel: null,
ariaLabelledBy: null
},
events: [
CHANGE,
CLICK,
LISTBOUND,
ITEMCHANGE,
ACTIVATE,
DEACTIVATE
],
setOptions: function(options) {
var itemClass = this.options.columns && this.options.columns.length ? TABLE_ITEM : LIST_ITEM;
Widget.fn.setOptions.call(this, options);
if (this._selectProxy && this.options.selectable === false) {
this.element.off(CLICK, "." + itemClass, this._selectProxy);
} else if (!this._selectProxy && this.options.selectable) {
this._selectable();
}
this._templates();
this.refresh();
},
items: function() {
return $(this._items);
},
destroy: function() {
this.wrapper.off(VIRTUAL_LIST_NS);
this.dataSource.unbind(CHANGE, this._refreshHandler);
Widget.fn.destroy.call(this);
},
setDataSource: function(source) {
var that = this;
var dataSource = source || {};
var value;
dataSource = Array.isArray(dataSource) ? { data: dataSource } : dataSource;
dataSource = kendo.data.DataSource.create(dataSource);
if (that.dataSource) {
that.dataSource.unbind(CHANGE, that._refreshHandler);
that._clean();
that.bound(false);
that._deferValueSet = true;
value = that.value();
that.value([]);
that.mute(function() {
that.value(value);
});
} else {
that._refreshHandler = that.refresh.bind(that);
}
that.dataSource = dataSource.bind(CHANGE, that._refreshHandler);
that.setDSFilter(dataSource.filter());
if (dataSource.view().length !== 0) {
that.refresh();
} else if (that.options.autoBind) {
dataSource.fetch();
}
},
skip: function() {
return this.dataSource.currentRangeStart();
},
_triggerListBound: function() {
var that = this;
var skip = that.skip();
if (that.bound() && !that._selectingValue && that._skip !== skip) {
that._skip = skip;
that.trigger(LISTBOUND);
}
},
_getValues: function(dataItems) {
var getter = this._valueGetter;
return $.map(dataItems, function(dataItem) {
return getter(dataItem);
});
},
_highlightSelectedItems: function() {
for (var i = 0; i < this._selectedDataItems.length; i++) {
var item = this._getElementByDataItem(this._selectedDataItems[i]);
if (item.length) {
item.addClass(SELECTED);
}
}
},
refresh: function(e) {
var that = this;
var action = e && e.action;
var isItemChange = action === "itemchange";
var filtered = this.isFiltered();
var result;
if (that._mute) { return; }
that._deferValueSet = false;
if (!that._fetching) {
if (filtered) {
that.focus(0);
}
that._createList();
if (!action && that._values.length && !filtered &&
!that.options.skipUpdateOnBind && !that._emptySearch) {
that._selectingValue = true;
that.bound(true);
that.value(that._values, true).done(function() {
that._selectingValue = false;
that._triggerListBound();
});
} else {
that.bound(true);
that._highlightSelectedItems();
that._triggerListBound();
}
} else {
if (that._renderItems) {
that._renderItems(true);
}
that._triggerListBound();
}
if (isItemChange || action === "remove") {
result = mapChangedItems(that._selectedDataItems, e.items);
if (result.changed.length) {
if (isItemChange) {
that.trigger("selectedItemChange", {
items: result.changed
});
} else {
that.value(that._getValues(result.unchanged));
}
}
}
that._fetching = false;
},
removeAt: function(position) {
var value = this._values.splice(position, 1)[0];
return {
position: position,
dataItem: this._removeSelectedDataItem(value)
};
},
_removeSelectedDataItem: function(value) {
var that = this,
valueGetter = that._valueGetter;
for (var idx in that._selectedDataItems) {
if (valueGetter(that._selectedDataItems[idx]) === value) {
that._selectedIndexes.splice(idx, 1);
return that._selectedDataItems.splice(idx, 1)[0];
}
}
},
setValue: function(value) {
this._values = toArray(value);
},
value: function(value, _forcePrefetch) {
var that = this;
if (value === undefined) {
return that._values.slice();
}
if (value === null) {
value = [];
}
value = toArray(value);
if (!that._valueDeferred || that._valueDeferred.state() === "resolved") {
that._valueDeferred = $.Deferred();
}
var shouldClear = that.options.selectable === "multiple" && that.select().length && value.length;
if (shouldClear || !value.length) {
that.select(-1);
}
that._values = value;
if ((that.bound() && !that._mute && !that._deferValueSet) || _forcePrefetch) {
that._prefetchByValue(value);
}
return that._valueDeferred;
},
_checkValuesOrder: function(value) {
if (this._removedAddedIndexes &&
this._removedAddedIndexes.length === value.length) {
var newValue = this._removedAddedIndexes.slice();
this._removedAddedIndexes = null;
return newValue;
}
return value;
},
_prefetchByValue: function(value) {
var that = this,
dataView = that._dataView,
valueGetter = that._valueGetter,
mapValueTo = that.options.mapValueTo,
item, match = false,
forSelection = [];
//try to find the items in the loaded data
for (var i = 0; i < value.length; i++) {
for (var idx = 0; idx < dataView.length; idx++) {
item = dataView[idx].item;
if (item) {
match = isPrimitive(item) ? value[i] === item : value[i] === valueGetter(item);
if (match) {
forSelection.push(dataView[idx].index);
}
}
}
}
if (forSelection.length === value.length) {
that._values = [];
that.select(forSelection);
return;
}
//prefetch the items
if (typeof that.options.valueMapper === "function") {
const callback = mapValueTo === 'index' ? that.mapValueToIndex : that.mapValueToDataItem;
that.options.valueMapper(valueMapperOptions(this.options, value, callback.bind(that)));
} else {
if (!that.value()[0]) {
that.select([-1]);
} else {
that._selectingValue = false;
that._triggerListBound();
}
}
},
mapValueToIndex: function(indexes) {
if (indexes === undefined || indexes === -1 || indexes === null) {
indexes = [];
} else {
indexes = toArray(indexes);
}
if (!indexes.length) {
indexes = [-1];
} else {
var removed = this._deselect([]).removed;
if (removed.length) {
this._triggerChange(removed, []);
}
}
this.select(indexes);
},
mapValueToDataItem: function(dataItems) {
var removed, added;
if (dataItems === undefined || dataItems === null) {
dataItems = [];
} else {
dataItems = toArray(dataItems);
}
if (!dataItems.length) {
this.select([-1]);
} else {
removed = $.map(this._selectedDataItems, function(item, index) {
return { index: index, dataItem: item };
});
added = $.map(dataItems, function(item, index) {
return { index: index, dataItem: item };
});
this._selectedDataItems = dataItems;
this._selectedIndexes = [];
for (var i = 0; i < this._selectedDataItems.length; i++) {
var item = this._getElementByDataItem(this._selectedDataItems[i]);
this._selectedIndexes.push(this._getIndecies(item)[0]);
item.addClass(SELECTED);
}
this._triggerChange(removed, added);
if (this._valueDeferred) {
this._valueDeferred.resolve();
}
}
},
deferredRange: function(index) {
var dataSource = this.dataSource;
var take = this.itemCount;
var ranges = this._rangesList;
var result = $.Deferred();
var defs = [];
var low = Math.floor(index / take) * take;
var high = Math.ceil(index / take) * take;
var pages = high === low ? [ high ] : [ low, high ];
$.each(pages, function(_, skip) {
var end = skip + take;
var existingRange = ranges[skip];
var deferred;
if (!existingRange || (existingRange.end !== end)) {
deferred = $.Deferred();
ranges[skip] = { end: end, deferred: deferred };
dataSource._multiplePrefetch(skip, take, function() {
deferred.resolve();
});
} else {
deferred = existingRange.deferred;
}
defs.push(deferred);
});
$.when.apply($, defs).done(function() {
result.resolve();
});
return result;
},
prefetch: function(indexes) {
var that = this,
take = this.itemCount,
isEmptyList = !that._promisesList.length;
if (!isActivePromise(that._activeDeferred)) {
that._activeDeferred = $.Deferred();
that._promisesList = [];
}
$.each(indexes, function(_, index) {
that._promisesList.push(that.deferredRange(that._getSkip(index, take)));
});
if (isEmptyList) {
$.when.apply($, that._promisesList).done(function() {
that._promisesList = [];
that._activeDeferred.resolve();
});
}
return that._activeDeferred;
},
_findDataItem: function(view, index) {
var group;
//find in grouped view
if (this.options.type === "group") {
for (var i = 0; i < view.length; i++) {
group = view[i].items;
if (group.length <= index) {
index = index - group.length;
} else {
return group[index];
}
}
}
//find in flat view
return view[index];
},
_getRange: function(skip, take) {
return this.dataSource._findRange(skip, Math.min(skip + take, this.dataSource.total()));
},
dataItemByIndex: function(index) {
var that = this;
var take = that.itemCount;
var skip = that._getSkip(index, take);
var view = this._getRange(skip, take);
//should not return item if data is not loaded
if (!that._getRange(skip, take).length) {
return null;
}
if (that.options.type === "group") {
kendo.ui.progress($(that.wrapper), true);
that.mute(function() {
that.dataSource.range(skip, take, function() {
kendo.ui.progress($(that.wrapper), false);
});
view = that.dataSource.view();
});
}
return that._findDataItem(view, [index - skip]);
},
selectedDataItems: function() {
return this._selectedDataItems.slice();
},
scrollWith: function(value) {
this.content.scrollTop(this.content.scrollTop() + value);
},
scrollTo: function(y) {
this.content.scrollTop(y); //works only if the element is visible
},
scrollToIndex: function(index) {
this.scrollTo(index * this.options.itemHeight);
},
focus: function(candidate) {
var element,
index,
data,
current,
itemHeight = this.options.itemHeight,
id = this._optionID,
triggerEvent = true;
if (candidate === undefined) {
current = this.element.find("." + FOCUSED);
return current.length ? current : null;
}
if (typeof candidate === "function") {
data = this.dataSource.flatView();
for (var idx = 0; idx < data.length; idx++) {
if (candidate(data[idx])) {
candidate = idx;
break;
}
}
}
if (candidate instanceof Array) {
candidate = lastFrom(candidate);
}
if (isNaN(candidate)) {
element = $(candidate);
index = parseInt($(element).attr("data-offset-index"), 10);
} else {
index = candidate;
element = this._getElementByIndex(index);
}
if (index === -1) {
this.element.find("." + FOCUSED).removeClass(FOCUSED);
this._focusedIndex = undefined;
return;
}
if (element.length) { /*focus rendered item*/
if (element.hasClass(FOCUSED)) {
triggerEvent = false;
}
if (this._focusedIndex !== undefined) {
current = this._getElementByIndex(this._focusedIndex);
current
.removeClass(FOCUSED)
.removeAttr("id");
if (triggerEvent) {
this.trigger(DEACTIVATE);
}
}
this._focusedIndex = index;
element
.addClass(FOCUSED)
.attr("id", id);
var position = this._getElementLocation(index);
if (position === "top") {
this.scrollTo(index * itemHeight);
} else if (position === "bottom") {
this.scrollTo((index * itemHeight + itemHeight) - this._screenHeight);
} else if (position === "outScreen") {
this.scrollTo(index * itemHeight);
}
if (triggerEvent) {
this.trigger(ACTIVATE);
}
} else { /*focus non rendered item*/
this._focusedIndex = index;
this.items().removeClass(FOCUSED);
this.scrollToIndex(index);
}
},
focusIndex: function() {
return this._focusedIndex;
},
focusFirst: function() {
this.scrollTo(0);
this.focus(0);
},
focusLast: function() {
var lastIndex = this.dataSource.total();
this.scrollTo(this.heightContainer.offsetHeight);
this.focus(lastIndex - 1);
},
focusPrev: function() {
var index = this._focusedIndex;
var current;
if (!isNaN(index) && index > 0) {
index -= 1;
this.focus(index);
current = this.focus();
if (current && current.hasClass("k-loading-item")) {
index += 1;
this.focus(index);
}
return index;
} else {
index = this.dataSource.total() - 1;
this.focus(index);
return index;
}
},
focusNext: function() {
var index = this._focusedIndex;
var lastIndex = this.dataSource.total() - 1;
var current;
if (!isNaN(index) && index < lastIndex) {
index += 1;
this.focus(index);
current = this.focus();
if (current && current.hasClass("k-loading-item")) {
index -= 1;
this.focus(index);
}
return index;
} else {
index = 0;
this.focus(index);
return index;
}
},
_triggerChange: function(removed, added) {
removed = removed || [];
added = added || [];
if (removed.length || added.length) {
this.trigger(CHANGE, {
removed: removed,
added: added
});
}
},
select: function(candidate) {
var that = this,
indices,
initialIndices,
singleSelection = that.options.selectable !== "multiple",
prefetchStarted = isActivePromise(that._activeDeferred),
filtered = this.isFiltered(),
isAlreadySelected,
deferred,
result,
removed = [];
if (candidate === undefined) {
return that._selectedIndexes.slice();
}
if (!that._selectDeferred || that._selectDeferred.state() === "resolved") {
that._selectDeferred = $.Deferred();
}
indices = that._getIndecies(candidate);
isAlreadySelected = singleSelection && !filtered && lastFrom(indices) === lastFrom(this._selectedIndexes);
removed = that._deselectCurrentValues(indices);
if (removed.length || !indices.length || isAlreadySelected) {
that._triggerChange(removed);
if (that._valueDeferred) {
that._valueDeferred.resolve().promise();
}
return that._selectDeferred.resolve().promise();
}