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added functionality to download pdf #1101

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added functionality to download pdf #1101

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3 changes: 2 additions & 1 deletion blazorbootstrap/Components/PdfViewer/PdfViewer.razor
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,8 @@
<li><span class="dropdown-item d-flex align-items-center" role="button" @onclick="SwitchOrientationAsync"><Icon Class="mx-2" Name="IconName.Compass" Size="IconSize.x5" /> Switch Orientation</span></li>
<li><span class="dropdown-item d-flex align-items-center" role="button" @onclick="FirstPageAsync"><Icon Class="mx-2" Name="IconName.ChevronBarUp" Size="IconSize.x5" /> Go to First Page</span></li>
<li><span class="dropdown-item d-flex align-items-center" role="button" @onclick="LastPageAsync"><Icon Class="mx-2" Name="IconName.ChevronBarDown" Size="IconSize.x5" /> Go to Last Page</span></li>
<li><span class="dropdown-item d-flex align-items-center" role="button" @onclick="ResetZoomAsync"><Icon Class="mx-2" Name="IconName.PlusSlashMinus" Size="IconSize.x5" /> Reset Zoom</span></li>
<li><span class="dropdown-item d-flex align-items-center" role="button" @onclick="ResetZoomAsync"><Icon Class="mx-2" Name="IconName.PlusSlashMinus" Size="IconSize.x5" /> Reset Zoom</span></li>
<li><span class="dropdown-item d-flex align-items-center" role="button" @onclick="DownloadAsync"><Icon Class="mx-2" Name="IconName.PlusSlashMinus" Size="IconSize.x5" /> Download</span></li>
</ul>
</div>
</div>
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2 changes: 2 additions & 0 deletions blazorbootstrap/Components/PdfViewer/PdfViewer.razor.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,8 @@ private async Task PageNumberChangedAsync(int value)

private async Task PrintAsync() => await PdfViewerJsInterop.PrintAsync(objRef!, Id!, Url!);

private async Task DownloadAsync() => await PdfViewerJsInterop.DownloadAsync(objRef!, Id!, Url!);

private async Task ResetZoomAsync()
{
zoomLevel = defaultZoomLevel;
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6 changes: 6 additions & 0 deletions blazorbootstrap/Components/PdfViewer/PdfViewerJsInterop.cs
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Expand Up @@ -82,5 +82,11 @@ public async Task ZoomInOutAsync(object objRef, string elementId, double scale)
await module.InvokeVoidAsync("zoomInOut", objRef, elementId, scale);
}

public async Task DownloadAsync(object objRef, string elementId, string url)
{
var module = await moduleTask.Value;
await module.InvokeVoidAsync("downloadDocument", objRef, elementId, "document.pdf");
}

#endregion
}
42 changes: 41 additions & 1 deletion blazorbootstrap/wwwroot/blazor.bootstrap.pdf.js
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Expand Up @@ -46,6 +46,7 @@ class Pdf {
this.pageNumPending = null;
this.scale = 1;
this.rotation = 0;
this.url = '';

pdfInstances[this.id] = this;
}
Expand Down Expand Up @@ -198,7 +199,7 @@ export function initialize(dotNetHelper, elementId, scale, rotation, url) {
const pdf = new Pdf(elementId);
pdf.scale = scale;
pdf.rotation = rotation;

pdf.url = url;
pdfJS.getDocument(url).promise.then(function (doc) {
pdf.pdfDoc = doc;
pdf.pagesCount = doc.numPages;
Expand Down Expand Up @@ -265,3 +266,42 @@ function setPdfViewerMetaData(dotNetHelper, pdf) {

dotNetHelper.invokeMethodAsync('SetPdfViewerMetaData', { pagesCount: pdf.pagesCount, pageNumber: pdf.pageNum });
}

export function downloadDocument(dotNetHelper, elementId, filename) {
const pdf = Pdf.getPdf(elementId);
if (pdf.url) {
if (pdf.url.indexOf('data:') === 0) {
const split = pdf.url.split(',');
const base64Data = split.length > 1 ? split[1] : '';
try {
saveAsFile(filename, base64Data)
} catch (e) {
console.error('Failed to decode base64 PDF:', e);
}
}
else {
saveAsFileFromUrl(pdf.url)
}
}
else {
console.error('Pdf Url empty');
}
}

function saveAsFile(filename, byteBase64) {
var link = document.createElement('a');
link.download = filename;
link.href = "data:application/octet-stream;base64," + byteBase64;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}

function saveAsFileFromUrl(url) {
var link = document.createElement('a');
link.href = url;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}