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angular-vs-repeat.js
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(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>
//
// 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-scroll-parent="selector" - selector to the scrollable container. The directive will look for a closest parent matching
// he 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-property - 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-property 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
// EVENTS:
// - 'vsRepeatTrigger' - an event the directive listens for to manually trigger reinitialization
// - 'vsRepeatReinitialized' - an event the directive emits upon reinitialization done
var isMacOS = navigator.appVersion.indexOf('Mac') != -1,
wheelEventName = typeof window.onwheel !== 'undefined' ? 'wheel' : typeof window.onmousewheel !== 'undefined' ? 'mousewheel' : 'DOMMouseScroll',
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();
};
angular.module('vs-repeat', []).directive('vsRepeat', ['$compile', '$timeout', 'safeApply', function ($compile, $timeout, safeApply) {
return {
restrict: 'A',
scope: true,
require: '?^vsRepeat',
controller: ['$scope', function ($scope) {
this.$scrollParent = $scope.$scrollParent;
this.$fillElement = $scope.$fillElement;
}],
compile: function ($element, $attrs) {
var ngRepeatChild = $element.children().eq(0),
ngRepeatExpression = ngRepeatChild.attr('ng-repeat'),
childCloneHtml = ngRepeatChild[0].outerHTML,
expressionMatches = /^\s*(\S+)\s+in\s+([\S\s]+?)(track\s+by\s+\S+)?$/.exec(ngRepeatExpression),
lhs = expressionMatches[1],
rhs = expressionMatches[2],
rhsSuffix = expressionMatches[3],
collectionName = '$vs_collection',
attributesDictionary = {
'vsRepeat': 'elementSize',
'vsOffsetBefore': 'offsetBefore',
'vsOffsetAfter': 'offsetAfter',
'vsExcess': 'excess',
'vsTileView': 'tileView',
'vsAnimationEnable': 'vsAnimationEnable'
};
$element.empty();
if (!window.getComputedStyle || window.getComputedStyle($element[0]).position !== 'absolute')
$element.css('position', 'relative');
return {
pre: function ($scope, $element, $attrs, $ctrl) {
var childClone = angular.element(childCloneHtml),
originalCollection = [],
originalLength,
$$horizontal = typeof $attrs.vsHorizontal !== "undefined",
$wheelHelper,
$fillElement,
autoSize = !$attrs.vsRepeat,
elementOnRow = $attrs.vsElementOnRow ? parseInt($attrs.vsElementOnRow, 10) : 1,
sizesPropertyExists = !!$attrs.vsSizeProperty,
$scrollParent = $attrs.vsScrollParent ? closestElement.call($element, $attrs.vsScrollParent) : $element,
positioningPropertyTransform = $$horizontal ? 'translateX' : 'translateY',
positioningProperty = $$horizontal ? 'left' : 'top',
clientSize = $$horizontal ? 'clientWidth' : 'clientHeight',
offsetSize = $$horizontal ? 'offsetWidth' : 'offsetHeight',
scrollPos = $$horizontal ? 'scrollLeft' : 'scrollTop',
animate = true;
$scope.isIE9 = window.navigator.appVersion.indexOf('MSIE 9.0') ? true : false;
$scope.childWidth = 0;
$scope.childHeight = 0;
$scope.scrollTop = 0;
$scope.containerHeight = 0;
$scope.containerWidth = 0;
$scope.lastScroll = 0;
$scope.tileView = $attrs.vsTileView;
$scope.currentElemDetailsRowLastElemIndex = -1;
$scope.elementOnRow = elementOnRow;
$scope.detailSelector = '';
$scope.detailsContainer = null;
if ($scrollParent.length === 0) throw 'Specified scroll parent selector did not match any element';
$scope.$scrollParent = $scrollParent;
if (sizesPropertyExists) $scope.sizesCumulative = [];
//initial defaults
$scope.elementSize = $scrollParent[0][clientSize] || 50;
$scope.offsetBefore = 0;
$scope.offsetAfter = 0;
$scope.excess = 0;
function hideItems() {
if ($scope.isIE9) {
$('#obj-list-container>ul>li').css('opacity', '0');
}
}
function showItems() {
if ($scope.isIE9) {
var $elements = $('#obj-list-container>ul>li');
$elements.animate({
opacity: 1
}, 500);
}
}
Object.keys(attributesDictionary).forEach(function (key) {
if ($attrs[key]) {
$attrs.$observe(key, function (value) {
if (isNaN(parseInt(value))) {
$scope[attributesDictionary[key]] = value;
if (key == "vsTileView" && value) {
var timer = 500;
if ($scope.scrollTop > 0) {
timer = 0;
}
$scrollParent.scrollTop(0); //Scroll container to the top.
hideItems();
$scope.animate = "zoomOut";
if (value == "true") {
$scope.elementOnRow = $attrs.vsElementOnRow ? parseInt($attrs.vsElementOnRow, 10) : 1;
}
else
{
$scope.elementOnRow = 1;
}
safeApply($scope);
setTimeout(function () {
onWindowResize(true);
}, timer);
return;
}
}
else {
$scope[attributesDictionary[key]] = +value;
}
reinitialize();
});
}
});
$scope.$watchCollection(rhs, function (coll,oldValue) {
originalCollection = coll || [];
if (!originalCollection || originalCollection.length < 1) {
$scope[collectionName] = [];
originalLength = 0;
resizeFillElement(0);
$scope.sizesCumulative = [0];
return;
}
else {
originalLength = originalCollection.length;
if (sizesPropertyExists) {
$scope.sizes = originalCollection.map(function (item) {
return item[$attrs.vsSizeProperty];
});
var sum = 0;
$scope.sizesCumulative = $scope.sizes.map(function (size) {
var res = sum;
sum += size;
return res;
});
$scope.sizesCumulative.push(sum);
}
setAutoSize();
}
reinitialize();
});
function setAutoSize() {
if (autoSize) {
$scope.$$postDigest(function () {
if ($element[0].offsetHeight || $element[0].offsetWidth) { // element is visible
var children = $element.children(),
i = 0;
while (i < children.length) {
if (children[i].attributes['ng-repeat'] != null) {
if (children[i][offsetSize]) {
$scope.elementSize = children[i][offsetSize];
if ($scope.tileView == 'true') {
// $scope.childWidth = parseInt(children[0]['offsetWidth'], 10) + parseInt(children[0].offsetLeft, 10);
// $scope.childHeight = parseInt(children[0]['offsetHeight'], 10) + parseInt(children[0].offsetTop, 10);
$scope.childHeight = children.outerHeight(true);
$scope.childWidth = children.outerWidth(true);
$scope.containerHeight = $element[0].offsetHeight;
$scope.containerWidth = $element[0].offsetWidth;
elementOnRow = $attrs.vsElementOnRow ? parseInt($attrs.vsElementOnRow, 10) : Math.floor($element[0].offsetWidth / $scope.childWidth);
$scope.elementOnRow = elementOnRow;
//console.log("Element :" + elementOnRow);
}
else if (!$$horizontal) {
$scope.elementSize = $scope.elementSize + parseInt(window.getComputedStyle(children[i]).marginBottom, 10);
$scope.childHeight = $scope.elementSize;
// $scope.elementOnRow = $attrs.vsElementOnRow ? parseInt($attrs.vsElementOnRow, 10) : 1;
$scope.elementOnRow = 1;
}
else if ($$horizontal) {
$scope.elementSize = $scope.elementSize + parseInt(children[0].offsetLeft, 10);
}
reinitialize();
autoSize = false;
if ($scope.$root && !$scope.$root.$$phase)
//$scope.$apply();
$scope.$digest();
}
break;
}
i++;
}
}
else {
var dereg = $scope.$watch(function () {
if ($element[0].offsetHeight || $element[0].offsetWidth) {
dereg();
setAutoSize();
}
});
}
});
}
}
childClone.attr('ng-repeat', lhs + ' in ' + collectionName + (rhsSuffix ? ' ' + rhsSuffix : ''))
.addClass('vs-repeat-repeated-element');
var offsetCalculationString = sizesPropertyExists ?
'(sizesCumulative[$index + startIndex] + offsetBefore)' :
'(($index + startIndex) * elementSize + offsetBefore)';
$scope.Math = window.Math;
var transformProperty = "translate",
offsetX = '((($index + startIndex) % elementOnRow) * childWidth)',
offsetY = '(Math.floor(($index + startIndex) / elementOnRow) * childHeight)';
if (($attrs.vsAnimationEnable == 'true')) {
childClone.attr('ng-class', '{animated:true,zoomIn:(animate == "zoomIn") ,zoomOut:(animate == "zoomOut") , zeroOpacity:(isIE9 && animate == "zoomIn"),zeroOpacity:(animate == "zeroOpacity")}');
}
//Common for tile & list view.
childClone.attr('ng-style', '{top:' + offsetY + '+"px", left:' + offsetX + '+"px"}');
$compile(childClone)($scope);
$element.append(childClone);
$fillElement = angular.element('<div class="vs-repeat-fill-element"></div>')
.css({
'position': 'relative',
'min-height': '100%',
'min-width': '100%'
});
$element.append($fillElement);
$compile($fillElement)($scope);
$scope.$fillElement = $fillElement;
var _prevMouse = {};
if (isMacOS) {
$wheelHelper = angular.element('<div class="vs-repeat-wheel-helper"></div>')
.on(wheelEventName, function (e) {
e.preventDefault();
e.stopPropagation();
if (e.originalEvent) e = e.originalEvent;
$scrollParent[0].scrollLeft += (e.deltaX || -e.wheelDeltaX);
$scrollParent[0].scrollTop += (e.deltaY || -e.wheelDeltaY);
}).on('mousemove', function (e) {
if (_prevMouse.x !== e.clientX || _prevMouse.y !== e.clientY)
angular.element(this).css('display', 'none');
_prevMouse = {
x: e.clientX,
y: e.clientY
};
}).css('display', 'none');
$fillElement.append($wheelHelper);
}
$scope.startIndex = 0;
$scope.endIndex = 0;
var scrollTimer = 0;
$scrollParent.on('scroll', function scrollHandler(e) {
clearTimeout(scrollTimer);
scrollTimer = setTimeout(function () {
animate = false;
$scope.scrollTop = $scrollParent[0][scrollPos];
if (updateInnerCollection())
//$scope.$apply();
$scope.$digest();
}, 0);
});
if (isMacOS) {
$scrollParent.on(wheelEventName, wheelHandler);
}
function wheelHandler(e) {
var elem = e.currentTarget;
if (elem.scrollWidth > elem.clientWidth || elem.scrollHeight > elem.clientHeight)
$wheelHelper.css('display', 'block');
}
function onWindowResize(animation) {
if (!animation) {
animate = false;
}
else {
animate = true;
}
if (typeof $attrs.vsAutoresize !== 'undefined') {
autoSize = true;
setAutoSize();
if ($scope.$root && !$scope.$root.$$phase)
// $scope.$apply();
$scope.$digest();
}
if (updateInnerCollection())
// $scope.$apply();
$scope.$digest();
}
angular.element(window).on('resize', onWindowResize);
$scope.$on('$destroy', function () {
angular.element(window).off('resize', onWindowResize);
});
$scope.$on('vsRepeatTrigger', reinitialize);
$scope.$on('vsRepeatResize', function () {
autoSize = true;
setAutoSize();
});
var _prevStartIndex,
_prevEndIndex;
function reinitialize() {
_prevStartIndex = void 0;
_prevEndIndex = void 0;
updateInnerCollection();
if ($scope.tileView == 'true') {
resizeFillElement(sizesPropertyExists ?
$scope.sizesCumulative[originalLength] :
(($scope.childHeight ? $scope.childHeight : $scope.elementSize) * Math.ceil(originalLength / elementOnRow))
);
}
else {
resizeFillElement(sizesPropertyExists ?
$scope.sizesCumulative[originalLength] :
$scope.elementSize * originalLength
);
}
$scope.$emit('vsRepeatReinitialized');
}
function resizeFillElement(size) {
if ($$horizontal) {
$fillElement.css({
'width': $scope.offsetBefore + size + $scope.offsetAfter + 'px',
'height': '100%'
});
if ($ctrl && $ctrl.$fillElement) {
var referenceElement = $ctrl.$fillElement[0].parentNode.querySelector('[ng-repeat]');
if (referenceElement)
$ctrl.$fillElement.css({
'width': referenceElement.scrollWidth + 'px'
});
}
}
else {
$fillElement.css({
'height': $scope.offsetBefore + size + $scope.offsetAfter + 'px',
'width': '100%'
});
if ($ctrl && $ctrl.$fillElement) {
referenceElement = $ctrl.$fillElement[0].parentNode.querySelector('[ng-repeat]');
if (referenceElement)
$ctrl.$fillElement.css({
'height': referenceElement.scrollHeight + 'px'
});
}
}
}
var _prevClientSize;
function reinitOnClientHeightChange() {
var ch = $scrollParent[0][clientSize];
if (ch !== _prevClientSize) {
animate = false;
reinitialize();
if ($scope.$root && !$scope.$root.$$phase)
//$scope.$apply();
$scope.$digest();
}
_prevClientSize = ch;
}
$scope.$watch(function () {
if (typeof window.requestAnimationFrame === "function")
window.requestAnimationFrame(reinitOnClientHeightChange);
else
reinitOnClientHeightChange();
});
function updateInnerCollection() {
if (sizesPropertyExists) {
$scope.startIndex = 0;
while ($scope.sizesCumulative[$scope.startIndex] < $scrollParent[0][scrollPos] - $scope.offsetBefore)
$scope.startIndex++;
if ($scope.startIndex > 0) $scope.startIndex--;
$scope.endIndex = $scope.startIndex;
while ($scope.sizesCumulative[$scope.endIndex] < $scrollParent[0][scrollPos] - $scope.offsetBefore + $scrollParent[0][clientSize])
$scope.endIndex++;
}
else {
$scope.excess = elementOnRow;
if ($scope.tileView == 'true') {
$scope.startIndex = Math.max(
Math.floor(
Math.floor(($scrollParent[0][scrollPos] - $scope.offsetBefore) / ($scope.childHeight ? $scope.childHeight : $scope.elementSize)) * elementOnRow
),
0
);
$scope.endIndex = Math.min(
$scope.startIndex + (Math.ceil(
($scrollParent[0][clientSize] + $scope.offsetBefore) / ($scope.childHeight ? $scope.childHeight : $scope.elementSize)
)) * elementOnRow + $scope.excess,
originalLength
);
if (window.vsTimer) {
window.clearInterval(window.vsTimer);
}
if (!$scope.childHeight && !$scope.childWidth) {
window.vsTimer = window.setInterval(function () {
if (!$scope.childHeight) {
setAutoSize();
safeApply($scope);
}
else {
window.clearInterval(window.vsTimer);
}
}, 100);
}
}
else {
$scope.startIndex = Math.max(
Math.floor(
($scrollParent[0][scrollPos] - $scope.offsetBefore) / $scope.elementSize + $scope.excess / 2
) - $scope.excess,
0
);
$scope.endIndex = Math.min(
$scope.startIndex + Math.ceil(
($scrollParent[0][clientSize] + $scope.offsetBefore) / $scope.elementSize
) + $scope.excess,
originalLength
);
}
}
var digestRequired = $scope.startIndex !== _prevStartIndex || $scope.endIndex !== _prevEndIndex;
if (digestRequired) {
if (animate) {
$scope.animate = "zoomIn";
$scope[collectionName] = originalCollection.slice($scope.startIndex, $scope.endIndex);
hideItems();
$scope.$$postDigest(function () {
showItems();
});
}
else {
$scope.animate = "";
$scope[collectionName] = originalCollection.slice($scope.startIndex, $scope.endIndex);
animate = true;
}
}
_prevStartIndex = $scope.startIndex;
_prevEndIndex = $scope.endIndex;
return digestRequired;
}
}
};
}
};
}]);
angular.element(document.head).append([
'<style>' +
'.vs-repeat-wheel-helper{' +
'position: absolute;' +
'top: 0;' +
'bottom: 0;' +
'left: 0;' +
'right: 0;' +
'z-index: 99999;' +
'background: rgba(0, 0, 0, 0);' +
'}' +
'.vs-repeat-repeated-element{' +
'position: absolute;' +
'z-index: 1;' +
'}' +
'</style>'
].join(''));
})(window, window.angular);