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KnockoutJS drop unused template options nodes, if, ifnot

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the-djmaze 2024-03-03 21:32:53 +01:00
parent e97cf8fa6b
commit 1357a696be
1 changed files with 4 additions and 33 deletions
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37
vendors/knockout/src/templating/templating.js vendored
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@ -171,9 +171,7 @@
var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
oldComputed?.['dispose']?.();
ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && (!newComputed.isActive || newComputed.isActive())) ? newComputed : undefined);
},
cleanContainerDomDataKey = ko.utils.domData.nextKey();
};
ko.bindingHandlers['template'] = {
'init': (element, valueAccessor) => {
@ -182,25 +180,6 @@
if (typeof bindingValue == "string" || 'name' in bindingValue) {
// It's a named template - clear the element
ko.virtualElements.emptyNode(element);
} else if ('nodes' in bindingValue) {
// We've been given an array of DOM nodes. Save them as the template source.
// There is no known use case for the node array being an observable array (if the output
// varies, put that behavior *into* your template - that's what templates are for), and
// the implementation would be a mess, so assert that it's not observable.
var nodes = bindingValue['nodes'] || [];
if (ko.isObservable(nodes)) {
throw new Error('The "nodes" option must be a plain, non-observable array.');
}
// If the nodes are already attached to a KO-generated container, we reuse that container without moving the
// elements to a new one (we check only the first node, as the nodes are always moved together)
let container = nodes[0]?.parentNode;
if (!container || !ko.utils.domData.get(container, cleanContainerDomDataKey)) {
container = ko.utils.moveCleanedNodesToContainerElement(nodes);
ko.utils.domData.set(container, cleanContainerDomDataKey, true);
}
new ko.templateSources.anonymousTemplate(element).nodes(container);
} else {
// It's an anonymous template - store the element contents, then clear the element
var templateNodes = ko.virtualElements.childNodes(element);
@ -225,19 +204,11 @@
options = {};
} else {
template = 'name' in options ? options['name'] : element;
// Support "if"/"ifnot" conditions
if ('if' in options)
shouldDisplay = ko.utils.unwrapObservable(options['if']);
if (shouldDisplay && 'ifnot' in options)
shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
// Don't show anything if an empty name is given (see #2446)
if (shouldDisplay && !template) {
shouldDisplay = false;
}
}
// Don't show anything if an empty name is given (see #2446)
shouldDisplay = !!template;
if ('foreach' in options) {
// Render once for each data point (treating data set as empty if shouldDisplay==false)
templateComputed = renderTemplateForEach(template, (shouldDisplay && options['foreach']) || [], options, element, bindingContext);