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update only small portion of DOM when binding arrays

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This commit is contained in:
Val Erastov 2016-10-24 21:19:17 -07:00
parent 96a4877340
commit 03a8f787b2
1 changed files with 37 additions and 14 deletions
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51
web/app/3d/ui/bind.js
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@ -33,22 +33,45 @@ export function BindArray(node, array, policy) {
policy = adjustPolicyForNode(node, policy);
let template = detachTemplate(node);
let scope = getScope(node);
node.children().detach();
clearScope(node);
for (let value of array) {
let child = scope.nestedScopes[value.id];
if (!child) {
child = template.clone();
} else {
delete scope.nestedScopes[value.id];
}
child.attr('data-bind-scope', value.id);
Bind(child, value, policy);
node.append(child);
function createFromTemplate(id) {
const child = template.clone();
child.attr('data-bind-scope', id);
scope.nestedScopes[id] = child;
return child;
}
for (let toDelete of Object.getOwnPropertyNames(scope.nestedScopes)) {
scope.nestedScopes[toDelete].remove();
const children = node.children();
let domPointer = 0;
for (let dataPointer = 0; dataPointer < array.length; dataPointer++) {
const value = array[dataPointer];
let domItem;
if (domPointer == children.length) {
domItem = createFromTemplate(value.id);
node.append(domItem);
} else {
domItem = children.eq(domPointer);
var domItemId = domItem.attr('data-bind-scope');
if (domItemId != value.id) {
domItem = scope.nestedScopes[value.id];
if (!domItem) {
domItem = createFromTemplate(value.id);
}
if (domPointer == 0) {
node.prepend(domItem);
} else {
children.eq(domPointer - 1).after(domItem);
}
}
domPointer ++;
}
Bind(domItem, value, policy);
}
//clean up
for (; domPointer < children.length; domPointer++) {
let item = children.eq(domPointer);
item.remove();
delete scope[item.attr('data-bind-scope')];
}
}