javascript - JQuery - appending and deleting html content while scrolling -


question: how can calculate scroll position after deleting (with jquery) lines @ beginning of html file - scroll position provide view @ same lines before deleting.

situation overview: have generated html page, have problems because generated page may have 200mb. want to: + hold data in js's array + append content @ end , delete @ beginning dynamically while scrolling down + append content @ beginning , delete @ end while scrolling up

operations page beginning making unpredictable scrolls different page parts. here's code, don't feel it's - there're lot of unused variables. note i'm appending lines array datalines + in visibledatalinesnumbers have indexes of lines should shown (there're hide/show selected lines functionality). every line has id connected index in datalines (id = "l"+indexfromdataline)

var howmanylinestoappend = 100; var howmanylinestodelete = 300; var whenappendinpercent = 8/10; var contentheightmax = 15000; var loglinedivheight; var lastscrolltop = 0; window.onscroll = scrollhandling;  function scrollhandling() {     var contentheight = document.getelementbyid("log").offsetheight;     var yoffset = window.pageyoffset;            var yposition = yoffset + window.innerheight;       var st = $(this).scrolltop();        if (st > lastscrolltop) {         downscrollhandling(contentheight, yoffset, yposition);     }     else {         upscrollhandling(contentheight, yoffset, yposition);     }     lastscrolltop = st;  }    function downscrollhandling(contentheight, yoffset, yposition) {     appenddatalinesattheendwhilescrolling(contentheight, yoffset, yposition);     deletedatalinesatthebeginningwhilescrolling(contentheight, yoffset, yposition); }  function upscrollhandling(contentheight, yoffset, yposition) {     appenddatalinesatthebeginningwhilescrolling(contentheight, yoffset, yposition);     deletedatalinesattheendwhilescrolling(contentheight, yoffset, yposition); }  function appenddatalinesatthebeginningwhilescrolling(contentheight, yoffset, yposition) {     if(lowerboundoflinesonscreen != 0 && yposition < (1-whenappendinpercent)*contentheight) {     var tmp ="";     var startinglowerboundoflinesonscreen = lowerboundoflinesonscreen;      for(var = startinglowerboundoflinesonscreen - howmanylinestoappend; < startinglowerboundoflinesonscreen; i++)         tmp += datalines[visiblelinesnumbers[i]];         lowerboundoflinesonscreen -= howmanylinestoappend;     $("#l"+startinglowerboundoflinesonscreen).before(tmp);     }    }  function deletedatalinesattheendwhilescrolling(contentheight, yoffset, yposition) {     if(contentheight > contentheightmax) {         for(var = upperboundoflinesonscreen  - howmanylinestodelete; < upperboundoflinesonscreen; i++)             $("#l"+visiblelinesnumbers[i]).remove();          upperboundoflinesonscreen -= howmanylinestodelete;     } }  function appenddatalinesattheendwhilescrolling(contentheight, yoffset, yposition) {     if( yposition >= contentheight * whenappendinpercent ) {         showdatalines(howmanylinestoappend);             } }  function deletedatalinesatthebeginningwhilescrolling(contentheight, yoffset, yposition)  {     if(contentheight > contentheightmax) {         for(var = lowerboundoflinesonscreen; < lowerboundoflinesonscreen + howmanylinestodelete; i++) {             $("#l"+visiblelinesnumbers[i]).remove();         }             lowerboundoflinesonscreen += howmanylinestodelete;     } }

take on script: https://github.com/cardinalpath/gas/blob/master/src/plugins/max_scroll.js regards


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