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- Question 140
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Question 140/152
You develop an HTML5 application that allows users to upload files from their local computers.
The user interface must remain responsive during the upload.
You need to implement the file upload functionality for the application.
Which two actions should you perform? (Each correct answer presents a complete solution. Choose two.)
The user interface must remain responsive during the upload.
You need to implement the file upload functionality for the application.
Which two actions should you perform? (Each correct answer presents a complete solution. Choose two.)
Correct Answer: B,D
Explanation/Reference:
B: Example (notice the web storage api upload.aspx):
<!DOCTYPE html>
<html>
<head>
<title>Upload Files using XMLHttpRequest - Minimal</title>
</head>
<body>
<form id="form1" enctype="multipart/form-data" method="post" action="Upload.aspx">
<div class="row">
<label for="fileToUpload">Select a File to Upload</label><br />
<input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();"/>
</div>
<div id="fileName"></div>
<div id="fileSize"></div>
<div id="fileType"></div>
<div class="row">
<input type="button" onclick="uploadFile()" value="Upload" />
</div>
<div id="progressNumber"></div>
</form>
</body>
</html>
D:
* Because we're using XMLHttpRequest, the uploading is happening in the background. The page the user is on remains intact. Which is a nice feature to have if your business process can work with it.
* The XMLHttpRequest object has gotten a facelift in the Html5 specifications. Specifically the XMLHttpRequest Level 2 specification (currently the latest version) that has included the following new features:
Handling of byte streams such as File, Blob and FormData objects for uploading and downloading
Progress events during uploading and downloading
Cross-origin requests
Allow making anonymous request - that is not send HTTP Referer
The ability to set a Timeout for the Request
B: Example (notice the web storage api upload.aspx):
<!DOCTYPE html>
<html>
<head>
<title>Upload Files using XMLHttpRequest - Minimal</title>
</head>
<body>
<form id="form1" enctype="multipart/form-data" method="post" action="Upload.aspx">
<div class="row">
<label for="fileToUpload">Select a File to Upload</label><br />
<input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();"/>
</div>
<div id="fileName"></div>
<div id="fileSize"></div>
<div id="fileType"></div>
<div class="row">
<input type="button" onclick="uploadFile()" value="Upload" />
</div>
<div id="progressNumber"></div>
</form>
</body>
</html>
D:
* Because we're using XMLHttpRequest, the uploading is happening in the background. The page the user is on remains intact. Which is a nice feature to have if your business process can work with it.
* The XMLHttpRequest object has gotten a facelift in the Html5 specifications. Specifically the XMLHttpRequest Level 2 specification (currently the latest version) that has included the following new features:
Handling of byte streams such as File, Blob and FormData objects for uploading and downloading
Progress events during uploading and downloading
Cross-origin requests
Allow making anonymous request - that is not send HTTP Referer
The ability to set a Timeout for the Request
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