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Support for progress bar (while loading a large PDF) #206

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Support for progress bar (while loading a large PDF) #206

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e6c7291
Add loading bar as a div element to viewer.html
MHShetty Jun 6, 2022
ae80f90
Add styling for the loading bar in viewer.css
MHShetty Jun 6, 2022
352efa6
Add required functionality for the loader
MHShetty Jun 6, 2022
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11 changes: 11 additions & 0 deletions app/src/main/assets/viewer.css
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Original file line number Diff line number Diff line change
Expand Up @@ -79,3 +79,14 @@ body {
.textLayer .endOfContent.active {
top: 0;
}

#loading-bar-container {
width: 100%;
background-color: #bbdefb;
}

#loading-bar {
width: 0%;
height: 4px;
background-color: #106cc8;
}
3 changes: 3 additions & 0 deletions app/src/main/assets/viewer.html
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,9 @@
<script src="pdf.js"></script>
</head>
<body>
<div id="loading-bar-container">
<div id="loading-bar"></div>
</div>
<canvas id="content"></canvas>
<div id="text" class="textLayer"></div>
<script src="viewer.js"></script>
Expand Down
29 changes: 29 additions & 0 deletions app/src/main/assets/viewer.js
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Expand Up @@ -19,6 +19,25 @@ let useRender;
const cache = [];
const maxCached = 6;

var loading_bar = document.getElementById("loading-bar");
var loading_bar_container = document.getElementById("loading-bar-container");

function show_progress_bar() {
loading_bar.style.display = "block";
loading_bar_container.style.display = "block";
}

function hide_progress_bar() {
loading_bar.style.display = "none";
loading_bar_container.style.display = "none";
}

function set_progress(value) {
if(value==0) show_progress_bar();
else if(value==100) hide_progress_bar();
else loading_bar.style.width = value + "%";
}

function maybeRenderNextPage() {
if (renderPending) {
pageRendering = false;
Expand Down Expand Up @@ -209,6 +228,14 @@ function loadDocument() {
}
}

loadingTask.onProgress = function(data){
var progress = Math.ceil((data.loaded/data.total)*100);
console.log("Progress: " + progress);
set_progress(progress);
}

show_progress_bar();

loadingTask.promise.then(function (newDoc) {
pdfDoc = newDoc;
channel.setNumPages(pdfDoc.numPages);
Expand All @@ -218,7 +245,9 @@ function loadDocument() {
console.log("getMetadata error: " + error);
});
renderPage(channel.getPage(), false, false);
hide_progress_bar();
}, function (reason) {
hide_progress_bar();
console.error(reason.name + ": " + reason.message);
});
}