javascript - loading/busy indicator pristine div over page eventuality click


i got fan side javascript duty triggered symbol click (basically, the calculator!!). sometimes, due vast information page, javascript calculator duty take enlarged & creates page seem dead user. i formulation arrangement pristine div over whole page, maybe bustling indicator (in center) cell calculator duty ends, user waits cell slight ends. 




function calculateamountonclick() {
  // arrangement pristine div

  // radical loop!
    {

    }

  // mislay pristine div 

}


any ideas this? should i distribute css category div (which surrounds whole page's content) controlling javascript calculator duty starts? i attempted nonetheless didnt preferred results. opposed issues clarity ie 6. also i arrangement loading summary + settlement such pristine div?



tia



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