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Fix newly-created bug with 'on' prefix mismatch

This commit is contained in:
Steve Sanderson 2019-09-26 14:00:25 +01:00 committed by Artak
parent d2887ccc1c
commit cdef672310
3 changed files with 13 additions and 10 deletions
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2
src/Components/Web.JS/dist/Release/blazor.server.js generated vendored
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2
src/Components/Web.JS/dist/Release/blazor.webassembly.js generated vendored
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19
src/Components/Web.JS/src/Rendering/BrowserRenderer.ts
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@ -284,15 +284,10 @@ export class BrowserRenderer {
private applyAttribute(batch: RenderBatch, componentId: number, toDomElement: Element, attributeFrame: RenderTreeFrame) {
const frameReader = batch.frameReader;
const attributeName = frameReader.attributeName(attributeFrame)!;
const browserRendererId = this.browserRendererId;
const eventHandlerId = frameReader.attributeEventHandlerId(attributeFrame);
if (eventHandlerId) {
const firstTwoChars = attributeName.substring(0, 2);
const eventName = attributeName.substring(2);
if (firstTwoChars !== 'on' || !eventName) {
throw new Error(`Attribute has nonzero event handler ID, but attribute name '${attributeName}' does not start with 'on'.`);
}
const eventName = stripOnPrefix(attributeName);
this.eventDelegator.setListener(toDomElement, eventName, eventHandlerId, componentId);
return;
}
@ -328,11 +323,11 @@ export class BrowserRenderer {
if (internalAttributeName.startsWith(eventStopBubblingAttributeNamePrefix)) {
// Stop bubbling
const eventName = internalAttributeName.substring(eventStopBubblingAttributeNamePrefix.length);
const eventName = stripOnPrefix(internalAttributeName.substring(eventStopBubblingAttributeNamePrefix.length));
this.eventDelegator.setStopBubbling(element, eventName, attributeValue !== null);
} else if (internalAttributeName.startsWith(eventPreventDefaultAttributeNamePrefix)) {
// Prevent default
const eventName = internalAttributeName.substring(eventPreventDefaultAttributeNamePrefix.length);
const eventName = stripOnPrefix(internalAttributeName.substring(eventPreventDefaultAttributeNamePrefix.length));
this.eventDelegator.setPreventDefault(element, eventName, attributeValue !== null);
} else {
// The prefix makes this attribute name reserved, so any other usage is disallowed
@ -502,3 +497,11 @@ function clearBetween(start: Node, end: Node): void {
// as it adds noise to the DOM.
start.textContent = '!';
}
function stripOnPrefix(attributeName: string) {
if (attributeName.startsWith('on')) {
return attributeName.substring(2);
}
throw new Error(`Attribute should be an event name, but doesn't start with 'on'. Value: '${attributeName}'`);
}