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The web-based service composition, e.g. mashup, is becoming a popular style to reuse web services. From the perspective of reuse, existing work has limitations on qualifying whether the service or the service composition satisfies user requirements and adapting the service or composition according to the qualification results. For addressing these limitations, this paper proposes an on-the-fly approach to web-based service composition. Firstly, we do not distinguish the design-time and run-time of services and their composition so that they can be qualified in a what you see is what you get manner when services are selected or assembled. Secondly, we propose a component model for separating the service business and user interface so that they can be changed dynamically and independently in the adaptation of service selection and composition. This approach is demonstrated by a browser-based mashup tool.