- 學位論文
運用Ajax技術建構基於Web的即時追蹤系統
Applying Ajax Technology to Develop a Web-based Real-Time Tracking System
摘要
傳統行動追蹤應用常使用於單機應用程式上，但是除了需安裝特定軟體與獨立的地圖資料庫外，使用者在其他台電腦上便無法利用這項服務。我們透過Ajax技術把這項服務置於網際網路上，使用者只要透過瀏覽器便能使用即時的行動追蹤服務，增加服務取得上的便利性。Web應用程式在網際網路上已經相當普遍，但對於傳統的Web應用程式卻始終有著互動上的限制問題，而在具有即時追蹤特性的Location-Based Service (LBS)服務上，除了要求服務的行動使用者需要不斷上傳位置資訊外，在瀏覽器端的觀察者也需要不斷的要求即時的伺服器回應資料，在需要不斷讀取與更新的狀況下，必定會發生操作不順暢的現象，倘若使用Ajax技術的非同步處理方式，可以讓網頁應用程式不需重新讀取整個頁面，如此不僅可以減輕伺服器負擔並且減少網路流量負荷，更進而改善使用者的等待伺服器的回應時間。本篇論文利用Ajax技術建立一個以網頁為基礎，適用於即時追蹤目的的資訊平台，並且透過Web Service傳送使用者位置資訊，提供即時追蹤與區域感知服務。
並列摘要
Traditional mobile tracking application was used to be running as a typical desktop application which has to install specific software and independent GIS database. Moreover, the user can not use this service on other computers. In this study we build a mobile tracking service on the World-Wide Web through Ajax technology. By this method, users can get the service easily through the ubiquity of web browsers. This approach enhances the convenience of service accessibility. The system could provide real-time tracking service and area aware service. Web applications are popular over the Internet. However, the traditional web applications have generally exhibited limited interaction problems. Especially in the case of location-based service in real-time tracking, the mobile client need to continuously upload their location information to the server and the browser client also need to continuously request the server to obtain real-time response data. Under this situation with continuous request to server and refresh pages , the application will go into slow performance. If we make use of Ajax technology to retrieve data from server or send a request to server asynchronously in the background mode, the web browser can update the specific part of page without reloading the whole page. This approach will not only reduce server’s overload but also minimizes network traffic, furthermore enhancing user experience.