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A co-word analysis is applied for the analysis of the 21,656 keywords collected from 7214 articles published in 10 journals in the field of e-learning from the years 1999 to 2018. Specifically, a cluster analysis, social network analysis, strategic diagram, and graph theory were applied in the analysis for two time periods: 1999\u20132008 and 2009\u20132018. The study detects the bridging, popular, and core topics in e-learning research for the two periods. The research results indicate that e-learning research has undergone a health evolution over the past two decades. There is a temporal continuity of e-learning research because some research topics have kept their continuity over the studied 20\u00a0years. Meanwhile, the research traditions in the e-learning field are also continuously evolving with the development of new technologies. The results also offer useful hints on the future direction of how the field may evolve.<\/jats:p>","DOI":"10.1007\/s11192-020-03760-7","type":"journal-article","created":{"date-parts":[[2020,11,19]],"date-time":"2020-11-19T22:22:09Z","timestamp":1605824529000},"page":"1389-1414","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["Visualizing research trends and research theme evolution in E-learning field: 1999\u20132018"],"prefix":"10.1007","volume":"126","author":[{"given":"Yang","family":"Bai","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7447-1222","authenticated-orcid":false,"given":"Hongxiu","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,11,19]]},"reference":[{"issue":"August","key":"3760_CR1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1038\/srep31731","volume":"6","author":"EL Anderson","year":"2016","unstructured":"Anderson, E. 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