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Upload components are software products that are designed to be embedded into a web site to add upload functionality to it. Upload components are designed to replace the standard HTML4 upload mechanism. Compared with HTML4, Upload Components have a more user-friendly interface and support a wider range of features. ==HTML file uploads== The HTML4 standard supports requesting data to be requested from a client computer and uploaded to a server. The standard mechanism for this type of data transmission is HTML forms. With HTML forms a user’s files can be uploaded by employing tag with different attributes. This method allows web site developers to implement basic upload functionality. However, it has the following disadvantages: *Multiple files upload is not available – a user can upload only 1 file a time. *Limited upload size - it is usually impossible to send files up to dozens of megabytes (MB) via HTTP. *No optimization before uploading files is available. *Poor visualization – a user cannot see any information about the upload progress and estimated upload time. *Preview of selected files is not supported. *Awkward look and feel – the way a user selects files for upload is inconvenient. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Upload components」の詳細全文を読む スポンサード リンク
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