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Merge pull request #12241 from escapewindow/prevent-default

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confirm if leaving a modified form without saving
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Brendan Dahl 2020-08-20 17:56:59 -07:00 • committed by GitHub
commit 10f61b8c96
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4 changed files with 94 additions and 6 deletions
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web/base_viewer.js
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@ -127,6 +127,12 @@ function isSameScale(oldScale, newScale) {
return false;
}
function beforeUnload(evt) {
evt.preventDefault();
evt.returnValue = "";
return false;
}
/**
* Simple viewer control to display PDF content/pages.
* @implements {IRenderableView}
@ -436,6 +442,12 @@ class BaseViewer {
const firstPagePromise = pdfDocument.getPage(1);
const annotationStorage = pdfDocument.annotationStorage;
annotationStorage.onSetModified = function () {
window.addEventListener("beforeunload", beforeUnload);
};
annotationStorage.onResetModified = function () {
window.removeEventListener("beforeunload", beforeUnload);
};
this._pagesCapability.promise.then(() => {
this.eventBus.dispatch("pagesloaded", {