//
// Copyright Kamil Pękala http://github.com/kamilkp
// Angular Virtual Scroll Repeat v1.1.7 2016/03/08
//
(function(window, angular) {
'use strict';
/* jshint eqnull:true */
/* jshint -W038 */
// DESCRIPTION:
// vsRepeat directive stands for Virtual Scroll Repeat. It turns a standard ngRepeated set of elements in a scrollable container
// into a component, where the user thinks he has all the elements rendered and all he needs to do is scroll (without any kind of
// pagination - which most users loath) and at the same time the browser isn't overloaded by that many elements/angular bindings etc.
// The directive renders only so many elements that can fit into current container's clientHeight/clientWidth.
// LIMITATIONS:
// - current version only supports an Array as a right-hand-side object for ngRepeat
// - all rendered elements must have the same height/width or the sizes of the elements must be known up front
// USAGE:
// In order to use the vsRepeat directive you need to place a vs-repeat attribute on a direct parent of an element with ng-repeat
// example:
// <div vs-repeat>
// <div ng-repeat="item in someArray">
// <!-- content -->
// </div>
// </div>
//
// or:
// <div vs-repeat>
// <div ng-repeat-start="item in someArray">
// <!-- content -->
// </div>
// <div>
// <!-- something in the middle -->
// </div>
// <div ng-repeat-end>
// <!-- content -->
// </div>
// </div>
//
// You can also measure the single element's height/width (including all paddings and margins), and then speficy it as a value
// of the attribute 'vs-repeat'. This can be used if one wants to override the automatically computed element size.
// example:
// <div vs-repeat="50"> <!-- the specified element height is 50px -->
// <div ng-repeat="item in someArray">
// <!-- content -->
// </div>
// </div>
//
// IMPORTANT!
//
// - the vsRepeat directive must be applied to a direct parent of an element with ngRepeat
// - the value of vsRepeat attribute is the single element's height/width measured in pixels. If none provided, the directive
// will compute it automatically
// OPTIONAL PARAMETERS (attributes):
// vs-repeat-container="selector" - selector for element containing ng-repeat. (defaults to the current element)
// vs-scroll-parent="selector" - selector to the scrollable container. The directive will look for a closest parent matching
// the given selector (defaults to the current element)
// vs-horizontal - stack repeated elements horizontally instead of vertically
// vs-offset-before="value" - top/left offset in pixels (defaults to 0)
// vs-offset-after="value" - bottom/right offset in pixels (defaults to 0)
// vs-excess="value" - an integer number representing the number of elements to be rendered outside of the current container's viewport
// (defaults to 2)
// vs-size - a property name of the items in collection that is a number denoting the element size (in pixels)
// vs-autoresize - use this attribute without vs-size and without specifying element's size. The automatically computed element style will
// readjust upon window resize if the size is dependable on the viewport size
// vs-scrolled-to-end="callback" - callback will be called when the last item of the list is rendered
// vs-scrolled-to-end-offset="integer" - set this number to trigger the scrolledToEnd callback n items before the last gets rendered
// EVENTS:
// - 'vsRepeatTrigger' - an event the directive listens for to manually trigger reinitialization
// - 'vsRepeatReinitialized' - an event the directive emits upon reinitialization done
var dde = document.documentElement,
matchingFunction = dde.matches ? 'matches' :
dde.matchesSelector ? 'matchesSelector' :
dde.webkitMatches ? 'webkitMatches' :
dde.webkitMatchesSelector ? 'webkitMatchesSelector' :
dde.msMatches ? 'msMatches' :
dde.msMatchesSelector ? 'msMatchesSelector' :
dde.mozMatches ? 'mozMatches' :
dde.mozMatchesSelector ? 'mozMatchesSelector' : null;
var closestElement = angular.element.prototype.closest || function (selector) {
var el = this[0].parentNode;
while (el !== document.documentElement && el != null && !el[matchingFunction](selector)) {
el = el.parentNode;
}
if (el && el[matchingFunction](selector)) {
return angular.element(el);
}
else {
return angular.element();
}
};
function getWindowScroll() {
if ('pageYOffset' in window) {
return {
scrollTop: pageYOffset,
scrollLeft: pageXOffset
};
}
else {
var sx, sy, d = document, r = d.documentElement, b = d.body;
sx = r.scrollLeft || b.scrollLeft || 0;
sy = r.scrollTop || b.scrollTop || 0;
return {
scrollTop: sy,
scrollLeft: sx
};
}
}
function getClientSize(element, sizeProp) {
if (element === window) {
return sizeProp === 'clientWidth' ? window.innerWidth : window.innerHeight;
}
else {
return element[sizeProp];
}
}
function getScrollPos(element, scrollProp) {
return element === window ? getWindowScroll()[scrollProp] : element[scrollProp];
}
function getScrollOffset(vsElement, scrollElement, isHorizontal) {
var vsPos = vsElement.getBoundingClientRect()[isHorizontal ? 'left' : 'top'];
var scrollPos = scrollElement === window ? 0 : scrollElement.getBoundingClientRect()[isHorizontal ? 'left' : 'top'];
var correction = vsPos - scrollPos +
(scrollElement === window ? getWindowScroll() : scrollElement)[isHorizontal ? 'scrollLeft' : 'scrollTop'];
return correction;
}
var vsRepeatModule = angular.module('vs-repeat', []).directive('vsRepeat', ['$compile', '$parse', function($compile, $parse) {
return {
restrict: 'A',
scope: true,
compile: function($element, $attrs) {
var repeatContainer = angular.isDefined($attrs.vsRepeatContainer) ? angular.element($element[0].querySelector($attrs.vsRepeatContainer)) : $element,
ngRepeatChild = repeatContainer.children().eq(0),
ngRepeatExpression,
childCloneHtml = ngRepeatChild[0].outerHTML,
expressionMatches,
lhs,
rhs,
rhsSuffix,
originalNgRepeatAttr,
collectionName = '$vs_collection',
isNgRepeatStart = false,
attributesDictionary = {
'vsRepeat': 'elementSize',
'vsOffsetBefore': 'offsetBefore',
'vsOffsetAfter': 'offsetAfter',
'vsScrolledToEndOffset': 'scrolledToEndOffset',
'vsExcess': 'excess'
};
if (ngRepeatChild.attr('ng-repeat')) {
originalNgRepeatAttr = 'ng-repeat';
ngRepeatExpression = ngRepeatChild.attr('ng-repeat');
}
else if (ngRepeatChild.attr('data-ng-repeat')) {
originalNgRepeatAttr = 'data-ng-repeat';
ngRepeatExpression = ngRepeatChild.attr('data-ng-repeat');
}
else if (ngRepeatChild.attr('ng-repeat-start')) {
isNgRepeatStart = true;
originalNgRepeatAttr = 'ng-repeat-start';
ngRepeatExpression = ngRepeatChild.attr('ng-repeat-start');
}
else if (ngRepeatChild.attr('data-ng-repeat-start')) {
isNgRepeatStart = true;
originalNgRepeatAttr = 'data-ng-repeat-start';
ngRepeatExpression = ngRepeatChild.attr('data-ng-repeat-start');
}
else {
throw new Error('angular-vs-repeat: no ng-repeat directive on a child element');
}
expressionMatches = /^\s*(\S+)\s+in\s+([\S\s]+?)(track\s+by\s+\S+)?$/.exec(ngRepeatExpression);
lhs = expressionMatches[1];
rhs = expressionMatches[2];
rhsSuffix = expressionMatches[3];
if (isNgRepeatStart) {
var index = 0;
var repeaterElement = repeatContainer.children().eq(0);
while(repeaterElement.attr('ng-repeat-end') == null && repeaterElement.attr('data-ng-repeat-end') == null) {
index++;
repeaterElement = repeatContainer.children().eq(index);
childCloneHtml += repeaterElement[0].outerHTML;
}
}
repeatContainer.empty();
return {
pre: function($scope, $element, $attrs) {
var repeatContainer = angular.isDefined($attrs.vsRepeatContainer) ? angular.element($element[0].querySelector($attrs.vsRepeatContainer)) : $element,
childClone = angular.element(childCloneHtml),
childTagName = childClone[0].tagName.toLowerCase(),
originalCollection = [],
originalLength,
$$horizontal = typeof $attrs.vsHorizontal !== 'undefined',
$beforeContent = angular.element('<' + childTagName + ' class="vs-repeat-before-content"></' + childTagName + '>'),
$afterContent = angular.element('<' + childTagName + ' class="vs-repeat-after-content"></' + childTagName + '>'),
autoSize = !$attrs.vsRepeat,
sizesPropertyExists = !!$attrs.vsSize || !!$attrs.vsSizeProperty,
$scrollParent = $attrs.vsScrollParent ?
$attrs.vsScrollParent === 'window' ? angular.element(window) :
closestElement.call(repeatContainer, $attrs.vsScrollParent) : repeatContainer,
$$options = 'vsOptions' in $attrs ? $scope.$eval($attrs.vsOptions) : {},
clientSize = $$horizontal ? 'clientWidth' : 'clientHeight',
offsetSize = $$horizontal ? 'offsetWidth' : 'offsetHeight',
scrollPos = $$horizontal ? 'scrollLeft' : 'scrollTop';
$scope.totalSize = 0;
if (!('vsSize' in $attrs) && 'vsSizeProperty' in $attrs) {
console.warn('vs-size-property attribute is deprecated. Please use vs-size attribute which also accepts angular expressions.');
}
if ($scrollParent.length === 0) {
throw 'Specified scroll parent selector did not match any element';
}
$scope.$scrollParent = $scrollParent;
if (sizesPropertyExists) {
$scope.sizesCumulative = [];
}
//initial defaults
$scope.elementSize = (+$attrs.vsRepeat) || getClientSize($scrollParent[0], clientSize) || 50;
$scope.offsetBefore = 0;
$scope.offsetAfter = 0;
$scope.excess = 2;
if ($$horizontal) {
$beforeContent.css('height', '100%');
$afterContent.css('height', '100%');
}
else {
$beforeContent.css('width', '100%');
$afterContent.css('width', '100%');
}
Object.keys(attributesDictionary).forEach(function(key) {
if ($attrs[key]) {
$attrs.$observe(key, function(value) {
// '+' serves for getting a number from the string as the attributes are always strings
$scope[attributesDictionary[key]] = +value;
reinitialize();
});
}
});
$scope.$watchCollection(rhs, function(coll) {
originalCollection = coll || [];
refresh();
});
function refresh() {
if (!originalCollection || originalCollection.length < 1) {
$scope[collectionName] = [];
originalLength = 0;
$scope.sizesCumulative = [0];
}
else {
originalLength = originalCollection.length;
if (sizesPropertyExists) {
$scope.sizes = originalCollection.map(function(item) {
var s = $scope.$new(false);
angular.extend(s, item);
s[lhs] = item;
var size = ($attrs.vsSize || $attrs.vsSizeProperty) ?
s.$eval($attrs.vsSize || $attrs.vsSizeProperty) :
$scope.elementSize;
s.$destroy();
return size;
});
var sum = 0;
$scope.sizesCumulative = $scope.sizes.map(function(size) {
var res = sum;
sum += size;
return res;
});
$scope.sizesCumulative.push(sum);
}
else {
setAutoSize();
}
}
reinitialize();
}
function setAutoSize() {
if (autoSize) {
$scope.$$postDigest(function() {
if (repeatContainer[0].offsetHeight || repeatContainer[0].offsetWidth) { // element is visible
var children = repeatContainer.children(),
i = 0,
gotSomething = false,
insideStartEndSequence = false;
while (i < children.length) {
if (children[i].attributes[originalNgRepeatAttr] != null || insideStartEndSequence) {
if (!gotSomething) {
$scope.elementSize = 0;
}
gotSomething = true;
if (children[i][offsetSize]) {
$scope.elementSize += children[i][offsetSize];
}
if (isNgRepeatStart) {
if (children[i].attributes['ng-repeat-end'] != null || children[i].attributes['data-ng-repeat-end'] != null) {
break;
}
else {
insideStartEndSequence = true;
}
}
else {
break;
}
}
i++;
}
if (gotSomething) {
reinitialize();
autoSize = false;
if ($scope.$root && !$scope.$root.$$phase) {
$scope.$apply();
}
}
}
else {
var dereg = $scope.$watch(function() {
if (repeatContainer[0].offsetHeight || repeatContainer[0].offsetWidth) {
dereg();
setAutoSize();
}
});
}
});
}
}
function getLayoutProp() {
var layoutPropPrefix = childTagName === 'tr' ? '' : 'min-';
var layoutProp = $$horizontal ? layoutPropPrefix + 'width' : layoutPropPrefix + 'height';
return layoutProp;
}
childClone.eq(0).attr(originalNgRepeatAttr, lhs + ' in ' + collectionName + (rhsSuffix ? ' ' + rhsSuffix : ''));
childClone.addClass('vs-repeat-repeated-element');
repeatContainer.append($beforeContent);
repeatContainer.append(childClone);
$compile(childClone)($scope);
repeatContainer.append($afterContent);
$scope.startIndex = 0;
$scope.endIndex = 0;
function scrollHandler() {
if (updateInnerCollection()) {
$scope.$digest();
}
}
$scrollParent.on('scroll', scrollHandler);
function onWindowResize() {
if (typeof $attrs.vsAutoresize !== 'undefined') {
autoSize = true;
setAutoSize();
if ($scope.$root && !$scope.$root.$$phase) {
$scope.$apply();
}
}
if (updateInnerCollection()) {
$scope.$apply();
}
}
angular.element(window).on('resize', onWindowResize);
$scope.$on('$destroy', function() {
angular.element(window).off('resize', onWindowResize);
$scrollParent.off('scroll', scrollHandler);
});
$scope.$on('vsRepeatTrigger', refresh);
$scope.$on('vsRepeatResize', function() {
autoSize = true;
setAutoSize();
});
var _prevStartIndex,
_prevEndIndex,
_minStartIndex,
_maxEndIndex;
$scope.$on('vsRenderAll', function() {//e , quantum) {
if($$options.latch) {
setTimeout(function() {
// var __endIndex = Math.min($scope.endIndex + (quantum || 1), originalLength);
var __endIndex = originalLength;
_maxEndIndex = Math.max(__endIndex, _maxEndIndex);
$scope.endIndex = $$options.latch ? _maxEndIndex : __endIndex;
$scope[collectionName] = originalCollection.slice($scope.startIndex, $scope.endIndex);
_prevEndIndex = $scope.endIndex;
$scope.$$postDigest(function() {
$beforeContent.css(getLayoutProp(), 0);
$afterContent.css(getLayoutProp(), 0);
});
$scope.$apply(function() {
$scope.$emit('vsRenderAllDone');
});
});
}
});
function reinitialize() {
_prevStartIndex = void 0;
_prevEndIndex = void 0;
_minStartIndex = originalLength;
_maxEndIndex = 0;
updateTotalSize(sizesPropertyExists ?
$scope.sizesCumulative[originalLength] :
$scope.elementSize * originalLength
);
updateInnerCollection();
$scope.$emit('vsRepeatReinitialized', $scope.startIndex, $scope.endIndex);
}
function updateTotalSize(size) {
$scope.totalSize = $scope.offsetBefore + size + $scope.offsetAfter;
}
var _prevClientSize;
function reinitOnClientHeightChange() {
var ch = getClientSize($scrollParent[0], clientSize);
if (ch !== _prevClientSize) {
reinitialize();
if ($scope.$root && !$scope.$root.$$phase) {
$scope.$apply();
}
}
_prevClientSize = ch;
}
$scope.$watch(function() {
if (typeof window.requestAnimationFrame === 'function') {
window.requestAnimationFrame(reinitOnClientHeightChange);
}
else {
reinitOnClientHeightChange();
}
});
function updateInnerCollection() {
var $scrollPosition = getScrollPos($scrollParent[0], scrollPos);
var $clientSize = getClientSize($scrollParent[0], clientSize);
var scrollOffset = repeatContainer[0] === $scrollParent[0] ? 0 : getScrollOffset(
repeatContainer[0],
$scrollParent[0],
$$horizontal
);
var __startIndex = $scope.startIndex;
var __endIndex = $scope.endIndex;
if (sizesPropertyExists) {
__startIndex = 0;
while ($scope.sizesCumulative[__startIndex] < $scrollPosition - $scope.offsetBefore - scrollOffset) {
__startIndex++;
}
if (__startIndex > 0) { __startIndex--; }
// Adjust the start index according to the excess
__startIndex = Math.max(
Math.floor(__startIndex - $scope.excess / 2),
0
);
__endIndex = __startIndex;
while ($scope.sizesCumulative[__endIndex] < $scrollPosition - $scope.offsetBefore - scrollOffset + $clientSize) {
__endIndex++;
}
// Adjust the end index according to the excess
__endIndex = Math.min(
Math.ceil(__endIndex + $scope.excess / 2),
originalLength
);
}
else {
__startIndex = Math.max(
Math.floor(
($scrollPosition - $scope.offsetBefore - scrollOffset) / $scope.elementSize
) - $scope.excess / 2,
0
);
__endIndex = Math.min(
__startIndex + Math.ceil(
$clientSize / $scope.elementSize
) + $scope.excess,
originalLength
);
}
_minStartIndex = Math.min(__startIndex, _minStartIndex);
_maxEndIndex = Math.max(__endIndex, _maxEndIndex);
$scope.startIndex = $$options.latch ? _minStartIndex : __startIndex;
$scope.endIndex = $$options.latch ? _maxEndIndex : __endIndex;
var digestRequired = false;
if (_prevStartIndex == null) {
digestRequired = true;
}
else if (_prevEndIndex == null) {
digestRequired = true;
}
if (!digestRequired) {
if ($$options.hunked) {
if (Math.abs($scope.startIndex - _prevStartIndex) >= $scope.excess / 2 ||
($scope.startIndex === 0 && _prevStartIndex !== 0)) {
digestRequired = true;
}
else if (Math.abs($scope.endIndex - _prevEndIndex) >= $scope.excess / 2 ||
($scope.endIndex === originalLength && _prevEndIndex !== originalLength)) {
digestRequired = true;
}
}
else {
digestRequired = $scope.startIndex !== _prevStartIndex ||
$scope.endIndex !== _prevEndIndex;
}
}
if (digestRequired) {
$scope[collectionName] = originalCollection.slice($scope.startIndex, $scope.endIndex);
// Emit the event
$scope.$emit('vsRepeatInnerCollectionUpdated', $scope.startIndex, $scope.endIndex, _prevStartIndex, _prevEndIndex);
if ($attrs.vsScrolledToEnd) {
var triggerIndex = originalCollection.length - ($scope.scrolledToEndOffset || 0);
if (($scope.endIndex >= triggerIndex && _prevEndIndex < triggerIndex) || (originalCollection.length && $scope.endIndex === originalCollection.length)) {
$scope.$eval($attrs.vsScrolledToEnd);
}
}
_prevStartIndex = $scope.startIndex;
_prevEndIndex = $scope.endIndex;
var offsetCalculationString = sizesPropertyExists ?
'(sizesCumulative[$index + startIndex] + offsetBefore)' :
'(($index + startIndex) * elementSize + offsetBefore)';
var parsed = $parse(offsetCalculationString);
var o1 = parsed($scope, {$index: 0});
var o2 = parsed($scope, {$index: $scope[collectionName].length});
var total = $scope.totalSize;
$beforeContent.css(getLayoutProp(), o1 + 'px');
$afterContent.css(getLayoutProp(), (total - o2) + 'px');
}
return digestRequired;
}
}
};
}
};
}]);
if (typeof module !== 'undefined' && module.exports) {
module.exports = vsRepeatModule.name;
}
})(window, window.angular);