wy_test_dwt

v1.0.1

Published

4 years ago

wy_test

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ellie_wu

Cross-platform JavaScript library for web document scanning.

Overview

Dynamic Web TWAIN is a TWAIN-based scanning SDK software specifically designed for web applications. With just a few lines of code, you can develop robust applications to scan documents from TWAIN-compatible scanners, edit the scanned images and save them to a local/server file system or document repository.

Installation

npm install dwt

Features

TWAIN specification 2.1 and below compatible (ActiveX, HTML5 for Windows, Plugin APIs).
TWAIN specification 1.9 and below compatible (HTML5 for Mac API).
Optional disk caching mechanism enables high volume document scanning (up to thousands of pages).
Supports Auto Document Feeder (ADF) and multiple image acquisition.
Supports duplex scanning mode.
Supports image preview mode.
Supports blank page detection.
Built-in wizard mode intelligently manages TWAIN states.
Supports setting up image acquisition parameters (resolution, pixel type, bit depth, brightness, contrast, page size, unit, etc).
Supports both Native and Disk File Image transfer modes. ActiveX, Plugin and HTML5 for Windows APIs also support Buffered Memory transfer mode.

Documentation

Quick Start

Include dynamsoft.webtwain.min.js into your page:

<script type="text/javascript" src="https://www.dynamsoft.com/library/dwt/dynamsoft.webtwain.min.js"></script>

Select a source and scan documents:

<select size="1" id="source" style="position: relative; width: 220px;"></select>
<input type="button" value="Scan" onclick="AcquireImage();" />

<!-- dwtcontrolContainer is the default div id for Dynamic Web TWAIN control.
If you need to rename the id, you should also change the id in the dynamsoft.webtwain.config.js accordingly. -->
<div id="dwtcontrolContainer"></div>

<script type="text/javascript">
    Dynamsoft.WebTwainEnv.RegisterEvent('OnWebTwainReady', Dynamsoft_OnReady);  // Register OnWebTwainReady event. This event fires as soon as Dynamic Web TWAIN is initialized and ready to be used
    var DWObject;
    function Dynamsoft_OnReady() {
        DWObject = Dynamsoft.WebTwainEnv.GetWebTwain('dwtcontrolContainer');    // Get the Dynamic Web TWAIN object that is embeded in the div with id 'dwtcontrolContainer'
        if (DWObject) {
            if (window.navigator.platform.indexOf("Linux") !== -1) {
                    DWObject.ImageCaptureDriverType = 3;
            }
            var count = DWObject.SourceCount;
            for (var i = 0; i < count; i++)
                document.getElementById("source").options.add(new Option(DWObject.GetSourceNameItems(i), i)); // Get Data Source names from Data Source Manager and put them in a drop-down box
        }
    }
    function AcquireImage() {
        if (DWObject) {
            var OnAcquireImageSuccess, OnAcquireImageFailure;
            OnAcquireImageSuccess = OnAcquireImageFailure = function (){
                DWObject.CloseSource();
            };
            
            DWObject.SelectSourceByIndex(document.getElementById("source").selectedIndex); //Use method SelectSourceByIndex to avoid the 'Select Source' dialog
            DWObject.OpenSource();
            DWObject.IfDisableSourceAfterAcquire = true;	// Scanner source will be disabled/closed automatically after the scan.
            DWObject.AcquireImage(OnAcquireImageSuccess, OnAcquireImageFailure);
        }
    }
</script>

Full Sample

<!DOCTYPE html>
<html>
<head>
    <title>Use Dynamic Web TWAIN to Scan</title>
    <script type="text/javascript" src="https://www.dynamsoft.com/library/dwt/dynamsoft.webtwain.min.js"></script>
</head>
<body>
    <select size="1" id="source" style="position: relative; width: 220px;"></select>
    <input type="button" value="Scan" onclick="AcquireImage();" />

    <!-- dwtcontrolContainer is the default div id for Dynamic Web TWAIN control.
    If you need to rename the id, you should also change the id in the dynamsoft.webtwain.config.js accordingly. -->
    <div id="dwtcontrolContainer"></div>

    <script type="text/javascript">
        Dynamsoft.WebTwainEnv.RegisterEvent('OnWebTwainReady', Dynamsoft_OnReady);  // Register OnWebTwainReady event. This event fires as soon as Dynamic Web TWAIN is initialized and ready to be used

        var DWObject;

        function Dynamsoft_OnReady() {
            DWObject = Dynamsoft.WebTwainEnv.GetWebTwain('dwtcontrolContainer');    // Get the Dynamic Web TWAIN object that is embeded in the div with id 'dwtcontrolContainer'
            if (DWObject) {
                var count = DWObject.SourceCount;
                for (var i = 0; i < count; i++)
                    document.getElementById("source").options.add(new Option(DWObject.GetSourceNameItems(i), i)); // Get Data Source names from Data Source Manager and put them in a drop-down box
            }
        }
        function AcquireImage() {
            if (DWObject) {
				var OnAcquireImageSuccess, OnAcquireImageFailure;
				OnAcquireImageSuccess = OnAcquireImageFailure = function (){
					DWObject.CloseSource();
				};
				
                DWObject.SelectSourceByIndex(document.getElementById("source").selectedIndex); //Use method SelectSourceByIndex to avoid the 'Select Source' dialog
                DWObject.OpenSource();
                DWObject.IfDisableSourceAfterAcquire = true;	// Scanner source will be disabled/closed automatically after the scan.
                DWObject.AcquireImage(OnAcquireImageSuccess, OnAcquireImageFailure);
            }
        }
    </script>
</body>
</html>

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