Basic HTML version of Foils prepared July 9 99

Foil 69 onUnload onLoad Events

From Distance Education: How to do it DoD HPC Modernization Users Group Tutorial Monterey California, ACM Java Grande San Francisco, EDMEDIA Seattle -- June 7 99, June 14 99, June 20 99. by Geoffrey C. Fox


1 With <body onload="signifyload()" > signifyload is called when page is fully loaded and DOM fully constructed
  • For general pages use if(WW_isdefined(document.forms)) and count number of forms, images, links, layers. When count stabilizes, page is loaded
  • WebWisdom pages all have an onload event handler which inter alia registers with JSSB
2 for unloading, one can either
  • a) set onunload handler of general pages after they are loaded and make this handler signify (detected immediately)
  • b) set framewindow.WW_dynamicvariable = 1 (say) and then page is unloaded after one finds this variable undefined (detected in loop every .5 second)
3 These heuristics are used to estimate total load time of each page and report this to user or session master
  • Thus one can produce quite a detailed network and client environment status display for teacher (network administrator)

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