Save Presentations in JavaScript

Overview

Open Presentations in JavaScript described how to use the Presentation class to open a presentation. This article explains how to create and save presentations. The Presentation class contains a presentation’s contents. Whether you’re creating a presentation from scratch or modifying an existing one, you’ll want to save it when you’re finished. With Aspose.Slides for Node.js, you can save to a file or stream. This article explains the different ways to save a presentation.

Save Presentations to Files

Save a presentation to a file by calling the Presentation class’s save method. Pass the file name and save format to the method. The following example show how to save a presentation with Aspose.Slides.

// Instantiate the Presentation class that represents a presentation file.
let presentation = new aspose.slides.Presentation();
try {
    // Do some work here...

    // Save the presentation to a file.
    presentation.save("Output.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Save Presentations to Streams

You can save a presentation to a stream by passing an output stream to the Presentation class’s save method. A presentation can be written to many stream types. In the example below, we create a new presentation and save it to a file stream.

// Instantiate the Presentation class that represents a presentation file.
let presentation = new aspose.slides.Presentation();
try {
    let fileStream = java.newInstanceSync("java.io.FileOutputStream", "Output.pptx");
    try {
        // Save the presentation to the stream.
        presentation.save(fileStream, aspose.slides.SaveFormat.Pptx);
    } finally {
        fileStream.close();
    }
} finally {
    presentation.dispose();
}

Save Presentations with a Predefined View Type

Aspose.Slides lets you set the initial view that PowerPoint uses when the generated presentation opens through the ViewProperties class. Use the setLastView method with a value from the ViewType enumeration.

let presentation = new aspose.slides.Presentation();
try {
    presentation.getViewProperties().setLastView(aspose.slides.ViewType.SlideMasterView);
    presentation.save("SlideMasterView.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Save Presentations in the Strict Office Open XML Format

Aspose.Slides lets you save a presentation in the Strict Office Open XML format. Use the PptxOptions class and set its conformance property when saving. If you set Conformance.Iso29500_2008_Strict, the output file is saved in the Strict Office Open XML format.

The example below creates a presentation and saves it in the Strict Office Open XML format.

let options = new aspose.slides.PptxOptions();
options.setConformance(aspose.slides.Conformance.Iso29500_2008_Strict);

// Instantiate the Presentation class that represents a presentation file.
let presentation = new aspose.slides.Presentation();
try {
    // Save the presentation in the Strict Office Open XML format.
    presentation.save("StrictOfficeOpenXml.pptx", aspose.slides.SaveFormat.Pptx, options);
} finally {
    presentation.dispose();
}

Save Presentations in Office Open XML Format in Zip64 Mode

An Office Open XML file is a ZIP archive that imposes 4 GB (2^32 bytes) limits on the uncompressed size of any file, the compressed size of any file, and the total size of the archive, and it also limits the archive to 65,535 (2^16-1) files. ZIP64 format extensions raise these limits to 2^64.

The PptxOptions.setZip64Mode method lets you choose when to use ZIP64 format extensions when saving an Office Open XML file.

This method can be used with the following modes:

  • IfNecessary uses ZIP64 format extensions only if the presentation exceeds the limitations above. This is the default mode.
  • Never never uses ZIP64 format extensions.
  • Always always uses ZIP64 format extensions.

The following code demonstrates how to save a presentation as PPTX with ZIP64 format extensions enabled:

let pptxOptions = new aspose.slides.PptxOptions();
pptxOptions.setZip64Mode(aspose.slides.Zip64Mode.Always);

let presentation = new aspose.slides.Presentation("Sample.pptx");
try {
    presentation.save("OutputZip64.pptx", aspose.slides.SaveFormat.Pptx, pptxOptions);
} finally {
    presentation.dispose();
}

Save Presentations without Refreshing the Thumbnail

The PptxOptions.setRefreshThumbnail method controls thumbnail generation when saving a presentation to PPTX:

  • If set to true, the thumbnail is refreshed during save. This is the default.
  • If set to false, the current thumbnail is preserved. If the presentation has no thumbnail, none is generated.

In the code below, the presentation is saved to PPTX without refreshing its thumbnail.

let pptxOptions = new aspose.slides.PptxOptions();
pptxOptions.setRefreshThumbnail(false);

let presentation = new aspose.slides.Presentation("Sample.pptx");
try {
    presentation.save("Output.pptx", aspose.slides.SaveFormat.Pptx, pptxOptions);
}
finally {
    presentation.dispose();
}

Save Progress Updates in Percentage

Save-progress reporting is configured via the setProgressCallback method on SaveOptions and its subclasses. Provide a Java proxy that implements the IProgressCallback interface; during export, the callback receives periodic percentage updates.

The following code snippets show how to use IProgressCallback.

const ExportProgressHandler = java.newProxy("com.aspose.slides.IProgressCallback", {
    reporting: function(progressValue) {
        // Use the progress percentage value here.
        const progress = Math.floor(progressValue);
        console.log(`${progress}% of the file has been converted.`);
    }
});

let saveOptions = new aspose.slides.PdfOptions();
saveOptions.setProgressCallback(ExportProgressHandler);

let presentation = new aspose.slides.Presentation("Sample.pptx");
try {
    presentation.save("Output.pdf", aspose.slides.SaveFormat.Pdf, saveOptions);
} finally {
    presentation.dispose();
}
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