JavaScript Select all and deselect all

Source: Internet
Author: User

functionCheckallorcancelall () {//idea: 1. Get the checkbox selected; 1.1 Get checkbox element                varChkelt = document.getElementById ("Chkelt"); //1.2 Get checked status                varChecked =chkelt.checked; //2. If checked=true, select all check boxes;                //2.1 Get all check boxes                varAllinterests = Document.getelementsbyname ("Interest"); //2.2 iterating out each check box object                varMySpan = document.getElementById ("MySpan"); if(checked) {//Select all to set the check box to the selected state                     for(vari=0;i<allinterests.length;i++) {allinterests[i].checked=true; } myspan.innerhtml= "Deselect All"; }Else{                    //Cancel Select allChecked=false;  for(vari=0;i<allinterests.length;i++) {allinterests[i].checked=false; } myspan.innerhtml= "Select All"; }                }            </script> 

JavaScript Select all and deselect all

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