With the advancement of technology, eLearning is increasingly adopted as an instructional method in a wide range of educational settings and has opened up new possibilities in teaching and learning practices. However, there is insufficient empirical evidence to illustrate how eLearning benefits teaching and learning practice in its real-world applications. Therefore, an important question is raised--How can eLearning technology facilitate pedagogical advancement practically in the classroom? In this study, we focus on constructivist pedagogies, emphasizing the dramatic educational reform from teacher-centered pedagogy to a student-centered, constructivist approach. Based on observations of 79 eLearning classes in eight primary schools, four secondary schools, and two special education schools in Hong Kong, this study illustrates how eLearning technology can advance at least five constructivist pedagogies: 1) active learning, 2) student-centered learning, 3) peer learning, 4) personalized learning, and 5) differentiated learning. We illustrate that the interactive, self-paced, repetitious, and customizable features of eLearning systems facilitate the implementation of these five constructivist pedagogies. Successful examples from classroom observations are drawn to illustrate how teachers make practical use of eLearning technology. This article serves to stimulate further discussion on how eLearning can be applied across various settings to advance the effectiveness of constructivist pedagogies and to encourage practitioners to consider how to make use of eLearning technology in the classroom.