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After configuring the origins in the `DSConfiguration.ini` file, please set [`IfCheckCORS`](/_articles/info/api/Dynamsoft_WebTwainEnv.md#ifcheckcors) to `true` in `dynamsoft.webtwain.config.js`.
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When a request comes from a different origin, a CORS error message will be displayed, both in a pop-up and in the console.
On a desktop, when a new user accesses a web page using Dynamic Web TWAIN SDK for the first time, he will be prompted to install the Dynamic Web TWAIN Service. This is a built-in behaviour of the library. The prompt will display the download link. Once the installer is downloaded, the installation process will take just a few seconds.
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The prompt comes up when you try to [create a WebTwain instance](/_articles/extended-usage/advanced-initialization.md#instantiating-webtwain-without-onwebtwainready) in Service mode.
On **Windows and macOS**, double click the downloaded installer to install the service.
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Once the installation is done, the users can click the orange sentence 'click here to verify completion' or refresh the page to start using Dynamic Web TWAIN.
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The `Dynamsoft._show_install_dialog()` function defined in the `dynamsoft.webtwain.install.js` resource file generates the [Dynamic Web TWAIN Service](/_articles/faq/what-does-dynamsoft-service-do-on-end-user-machine.md) installation dialog box, pictured here:
As the dialog box contains instructions for installing the Dynamic Web TWAIN Service, consider altering the message strings for localization purposes. Generally we discourage directly modifying the resource files, but this dialogue function contains styling and messaging which may be tailored the web application itself. Try not to alter the platform detection logic too greatly, as this may interfere with the Dynamic Web TWAIN Service installation procedure. Please contact the [support team](/_articles/about/getsupport.md) for any further questions.
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## Installation Dialog
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This dialog comes up when using `Dynamic Web TWAIN` scanner module under one of the following conditions:
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### Loading bar and backdrop
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This loading bar and backdrop shows up when creating a `WebTwain` instance or when you try to scan. The functions `Dynamsoft.DWT.OnWebTwainPreExecute()` and `Dynamsoft.DWT.OnWebTwainPostExecute()` are called before and after the process. You can customize the behavior like this
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When `Dynamic Web TWAIN` performs a time-consuming task, it'll show a progress bar. This progress bar is either like this
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or like this (with a `Cancel` button)
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The 1st bar shows up when saving, loading or converting and can be hidden by setting [`IfShowProgressBar`](/_articles/info/api/WebTwain_IO.md#ifshowprogressbar) to `false` .
Copy file name to clipboardExpand all lines: _articles/faq/activeX-in-Edge-IE-mode.md
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1. Update Edge Default Browser settings per the screenshot:
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2. Download and install <ahref="https://www.microsoft.com/en-us/download/details.aspx?id=49974"target="_blank">Enterprise Mode Site List Manager</a> to <ahref="https://docs.microsoft.com/en-us/internet-explorer/ie11-deploy-guide/add-single-sites-to-enterprise-mode-site-list-using-the-version-2-enterprise-mode-tool"target="_blank">add</a> and <ahref="https://docs.microsoft.com/en-us/internet-explorer/ie11-deploy-guide/export-your-enterprise-mode-site-list-from-the-enterprise-mode-site-list-manager"target="_blank">export</a> a site list to a XML file.
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3. <ahref="https://docs.microsoft.com/en-us/internet-explorer/ie11-deploy-guide/turn-on-enterprise-mode-and-use-a-site-list"target="_blank">Turn on Enterprise Mode using Group Policy</a>
For the Dynamic Web TWAIN Service (also called "Dynamsoft Service") installation message below, you can customize the display language by searching for `Dynamsoft._show_install_dialog` in dynamsoft.webtwain.install.js, and changing the display language accordingly.
And you can test the API as much as you want. Let's take the [ConvertToBase64](https://www.dynamsoft.com/web-twain/docs/info/api/WebTwain_IO.html#converttobase64) as an example. After you input the code into the console and press Enter to run this code snippet, it will convert the image at index 0 in the buffer (that is, the first image) into a Base64 string.
Now that you've had the opportunity to preview how the DWT API operates in the web application, you can explore more features by reviewing the [API documentation]({{site.info}}api/).
Copy file name to clipboardExpand all lines: _articles/faq/deploy-your-own-upload-server-with-asp.net.md
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-JavaScript.zip">DynamicWebTWAIN-JavaScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-Angular.zip">DynamicWebTWAIN-Angular.zip</a>. After unzipping it, the directory structure is shown in the image below.
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<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-React-JavaScript.zip">DynamicWebTWAIN-React-JavaScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
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<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-React-TypeScript.zip">DynamicWebTWAIN-React-TypeScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-Vue-JavaScript.zip">DynamicWebTWAIN-Vue-JavaScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
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<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-Vue-TypeScript.zip">DynamicWebTWAIN-Vue-TypeScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-JavaScript.zip">DynamicWebTWAIN-JavaScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-Angular.zip">DynamicWebTWAIN-Angular.zip</a>. After unzipping it, the directory structure is shown in the image below.
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<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-React-JavaScript.zip">DynamicWebTWAIN-React-JavaScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
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<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-React-TypeScript.zip">DynamicWebTWAIN-React-TypeScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-Vue-JavaScript.zip">DynamicWebTWAIN-Vue-JavaScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
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<p>Note: The "Sample" directory mentioned in the steps below refers to the "Sample" directory shown in the image.</p>
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This article assumes that you have downloaded and unzipped this sample: <ahref="https://download2.dynamsoft.com/Samples/DWT_OnlineDemo/DynamicWebTWAIN-Vue-TypeScript.zip">DynamicWebTWAIN-Vue-TypeScript.zip</a>. After unzipping it, the directory structure is shown in the image below.
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