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Merge pull request #14138 from catherinemds/await/async-issue

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Convert examples/learning/helloworld.html to await/async
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Jonas Jenwald 2021-10-14 21:02:47 +02:00 committed by GitHub
commit 4b8496e70f
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1 changed files with 31 additions and 31 deletions
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examples/learning/helloworld.html
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@ -17,7 +17,7 @@
// If absolute URL from the remote server is provided, configure the CORS
// header on that server.
//
var url = './helloworld.pdf';
const url = './helloworld.pdf';
//
// The workerSrc property shall be specified.
@ -28,43 +28,43 @@
//
// Asynchronous download PDF
//
var loadingTask = pdfjsLib.getDocument(url);
loadingTask.promise.then(function(pdf) {
const loadingTask = pdfjsLib.getDocument(url);
(async () => {
const pdf = await loadingTask.promise;
//
// Fetch the first page
//
pdf.getPage(1).then(function(page) {
var scale = 1.5;
var viewport = page.getViewport({ scale: scale, });
// Support HiDPI-screens.
var outputScale = window.devicePixelRatio || 1;
const page = await pdf.getPage(1);
const scale = 1.5;
const viewport = page.getViewport({ scale });
// Support HiDPI-screens.
const outputScale = window.devicePixelRatio || 1;
//
// Prepare canvas using PDF page dimensions
//
var canvas = document.getElementById('the-canvas');
var context = canvas.getContext('2d');
//
// Prepare canvas using PDF page dimensions
//
const canvas = document.getElementById("the-canvas");
const context = canvas.getContext("2d");
canvas.width = Math.floor(viewport.width * outputScale);
canvas.height = Math.floor(viewport.height * outputScale);
canvas.style.width = Math.floor(viewport.width) + "px";
canvas.style.height = Math.floor(viewport.height) + "px";
canvas.width = Math.floor(viewport.width * outputScale);
canvas.height = Math.floor(viewport.height * outputScale);
canvas.style.width = Math.floor(viewport.width) + "px";
canvas.style.height = Math.floor(viewport.height) + "px";
var transform = outputScale !== 1
? [outputScale, 0, 0, outputScale, 0, 0]
: null;
const transform = outputScale !== 1
? [outputScale, 0, 0, outputScale, 0, 0]
: null;
//
// Render PDF page into canvas context
//
var renderContext = {
canvasContext: context,
transform: transform,
viewport: viewport,
};
page.render(renderContext);
});
});
//
// Render PDF page into canvas context
//
const renderContext = {
canvasContext: context,
transform,
viewport,
};
page.render(renderContext);
})();
</script>
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