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fix(ngRepeat): trigger move animation
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ngRepeat does not trigger a move animation for items that come after inserted or deleted items. The documentation says that a move animation occurs "when an adjacent item is filtered out causing a reorder or when the item contents are reordered". With this fix, items that are moved can use an animation, such as changing the border or background color, to show a change.

This will fix issue #15068.
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@pondermatic
pondermatic committed Aug 30, 2016
1 parent 53a3bf6 commit 2331c42
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154 changes: 78 additions & 76 deletions src/ng/directive/ngRepeat.js
View file
Expand Up @@ -325,7 +325,6 @@
</example>
*/
var ngRepeatDirective = ['$parse', '$animate', '$compile', function($parse, $animate, $compile) {
var NG_REMOVED = '$$NG_REMOVED';
var ngRepeatMinErr = minErr('ngRepeat');

var updateScope = function(scope, index, valueIdentifier, value, keyIdentifier, key, arrayLength) {
Expand Down Expand Up @@ -425,126 +424,129 @@ var ngRepeatDirective = ['$parse', '$animate', '$compile', function($parse, $ani

//watch props
$scope.$watchCollection(rhs, function ngRepeatAction(collection) {
var index, length,
previousNode = $element[0], // node that cloned nodes should be inserted after
// initialized to the comment node anchor
nextNode,
// Same as lastBlockMap but it has the current state. It will become the
// lastBlockMap on the next iteration.
nextBlockMap = createMap(),
collectionLength,
key, value, // key/value of iteration
trackById,
trackByIdFn,
collectionKeys,
block, // last object information {scope, element, id}
nextBlockOrder,
elementsToRemove;
var
block, // last object information {scope, element, id}
collectionKey,
collectionKeys = [],
elementsToRemove,
index, key, value, // key/value of iteration
lastBlockOrder = [],
lastKey,
nextBlockMap = createMap(),
nextBlockOrder = [],
nextKey, nextLength,
previousNode = $element[0], // node that cloned nodes should be inserted after
// initialized to the comment node anchor
trackById,
trackByIdFn;

if (aliasAs) {
$scope[aliasAs] = collection;
}

// get collectionKeys
if (isArrayLike(collection)) {
collectionKeys = collection;
trackByIdFn = trackByIdExpFn || trackByIdArrayFn;
} else {
trackByIdFn = trackByIdExpFn || trackByIdObjFn;
// if object, extract keys, in enumeration order, unsorted
collectionKeys = [];
for (var itemKey in collection) {
if (hasOwnProperty.call(collection, itemKey) && itemKey.charAt(0) !== '$') {
collectionKeys.push(itemKey);
for (collectionKey in collection) {
if (hasOwnProperty.call(collection, collectionKey) && collectionKey.charAt(0) !== '$') {
collectionKeys.push(collectionKey);
}
}
}
nextLength = collectionKeys.length;

collectionLength = collectionKeys.length;
nextBlockOrder = new Array(collectionLength);

// locate existing items
for (index = 0; index < collectionLength; index++) {
// setup nextBlockMap
for (index = 0; index < nextLength; index++) {
key = (collection === collectionKeys) ? index : collectionKeys[index];
value = collection[key];
trackById = trackByIdFn(key, value, index);
if (lastBlockMap[trackById]) {
// found previously seen block
block = lastBlockMap[trackById];
delete lastBlockMap[trackById];
nextBlockMap[trackById] = block;
nextBlockOrder[index] = block;
} else if (nextBlockMap[trackById]) {
// if collision detected. restore lastBlockMap and throw an error
forEach(nextBlockOrder, function(block) {
if (block && block.scope) lastBlockMap[block.id] = block;
});

if (nextBlockMap[trackById]) {
// if collision detected, throw an error
throw ngRepeatMinErr('dupes',
'Duplicates in a repeater are not allowed. Use \'track by\' expression to specify unique keys. Repeater: {0}, Duplicate key: {1}, Duplicate value: {2}',
expression, trackById, value);
} else {
// new never before seen block
nextBlockOrder[index] = {id: trackById, scope: undefined, clone: undefined};
nextBlockMap[trackById] = true;
'Duplicates in a repeater are not allowed. Use \'track by\' expression to specify unique keys. Repeater: {0}, Duplicate key: {1}, Duplicate value: {2}',
expression, trackById, value);
}
}

// remove leftover items
for (var blockKey in lastBlockMap) {
block = lastBlockMap[blockKey];
elementsToRemove = getBlockNodes(block.clone);
$animate.leave(elementsToRemove);
if (elementsToRemove[0].parentNode) {
// if the element was not removed yet because of pending animation, mark it as deleted
// so that we can ignore it later
for (index = 0, length = elementsToRemove.length; index < length; index++) {
elementsToRemove[index][NG_REMOVED] = true;
}
}
block.scope.$destroy();
nextBlockMap[trackById] = {id: trackById, clone: undefined, scope: undefined, index: index, key: key, value: value};
nextBlockOrder[index] = trackById;
}

// we are not using forEach for perf reasons (trying to avoid #call)
for (index = 0; index < collectionLength; index++) {
key = (collection === collectionKeys) ? index : collectionKeys[index];
value = collection[key];
block = nextBlockOrder[index];
// setup lastBlockOrder, used to determine if block moved
for (lastKey in lastBlockMap) {
lastBlockOrder.push(lastKey);
}

if (block.scope) {
// if we have already seen this object, then we need to reuse the
// associated scope/element
for (index = 0; index < nextLength; index++) {
nextKey = nextBlockOrder[index];

nextNode = previousNode;
if (lastBlockMap[nextKey]) {
// we have already seen this object and need to reuse the associated scope/element
block = lastBlockMap[nextKey];

// skip nodes that are already pending removal via leave animation
do {
nextNode = nextNode.nextSibling;
} while (nextNode && nextNode[NG_REMOVED]);
// move
if (lastBlockMap[nextKey].index !== nextBlockMap[nextKey].index) {
// If this block has moved because the last previous block was removed,
// then use the last previous block to set previousNode.
lastKey = lastBlockOrder[lastBlockMap[nextKey].index - 1];
if (lastKey && !nextBlockMap[lastKey]) {
previousNode = getBlockEnd(lastBlockMap[lastKey]);
}

if (getBlockStart(block) !== nextNode) {
// existing item which got moved
$animate.move(getBlockNodes(block.clone), null, previousNode);
block.index = nextBlockMap[nextKey].index;
}

updateScope(block.scope, index,
valueIdentifier, nextBlockMap[nextKey].value,
keyIdentifier, nextBlockMap[nextKey].key, nextLength);

nextBlockMap[nextKey] = block;
previousNode = getBlockEnd(block);
updateScope(block.scope, index, valueIdentifier, value, keyIdentifier, key, collectionLength);

} else {
// enter
// new item which we don't know about
$transclude(function ngRepeatTransclude(clone, scope) {
block.scope = scope;
nextBlockMap[nextKey].scope = scope;
// http://jsperf.com/clone-vs-createcomment
var endNode = ngRepeatEndComment.cloneNode(false);
clone[clone.length++] = endNode;

$animate.enter(clone, null, previousNode);
previousNode = endNode;

// Note: We only need the first/last node of the cloned nodes.
// However, we need to keep the reference to the jqlite wrapper as it might be changed later
// by a directive with templateUrl when its template arrives.
block.clone = clone;
nextBlockMap[block.id] = block;
updateScope(block.scope, index, valueIdentifier, value, keyIdentifier, key, collectionLength);
nextBlockMap[nextKey].clone = clone;
updateScope(scope, nextBlockMap[nextKey].index,
valueIdentifier, nextBlockMap[nextKey].value,
keyIdentifier, nextBlockMap[nextKey].key, nextLength);

delete nextBlockMap[nextKey].key;
delete nextBlockMap[nextKey].value;
});
}
}

// leave
// This must go after enter and move because leave prevents getting element's parent.
for (lastKey in lastBlockMap) {
if (nextBlockMap[lastKey]) {
continue;
}

block = lastBlockMap[lastKey];
elementsToRemove = getBlockNodes(block.clone);
$animate.leave(elementsToRemove);
block.scope.$destroy();
}

lastBlockMap = nextBlockMap;
});
};
Expand Down
58 changes: 57 additions & 1 deletion test/ng/directive/ngRepeatSpec.js
View file
Expand Up @@ -1487,7 +1487,13 @@ describe('ngRepeat animations', function() {
$rootScope.items = ['1','3'];
$rootScope.$digest();

item = $animate.queue.shift();
while ($animate.queue.length) {
item = $animate.queue.shift();
if (item.event == 'leave') {
break;
}
}

expect(item.event).toBe('leave');
expect(item.element.text()).toBe('2');
}));
Expand Down Expand Up @@ -1565,6 +1571,56 @@ describe('ngRepeat animations', function() {
item = $animate.queue.shift();
expect(item.event).toBe('move');
expect(item.element.text()).toBe('3');

item = $animate.queue.shift();
expect(item.event).toBe('move');
expect(item.element.text()).toBe('1');
})
);

it('should fire off the move animation for filtered items',
inject(function($compile, $rootScope, $animate) {

var item;

element = $compile(html(
'<div>' +
'<div ng-repeat="item in items | filter:search">' +
'{{ item }}' +
'</div>' +
'</div>'
))($rootScope);

$rootScope.items = ['1','2','3'];
$rootScope.search = '';
$rootScope.$digest();

item = $animate.queue.shift();
expect(item.event).toBe('enter');
expect(item.element.text()).toBe('1');

item = $animate.queue.shift();
expect(item.event).toBe('enter');
expect(item.element.text()).toBe('2');

item = $animate.queue.shift();
expect(item.event).toBe('enter');
expect(item.element.text()).toBe('3');

$rootScope.search = '3';
$rootScope.$digest();

item = $animate.queue.shift();
expect(item.event).toBe('move');
expect(item.element.text()).toBe('3');

item = $animate.queue.shift();
expect(item.event).toBe('leave');
expect(item.element.text()).toBe('1');

item = $animate.queue.shift();
expect(item.event).toBe('leave');
expect(item.element.text()).toBe('2');
})
);
});

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