Slide-movement end listener decline (determines whether the rolling elements in the end portion)

        Touchup () {
             var start = 0 ;
            let that = this;
            document.addEventListener("touchstart",function(e){
                startY = e.changedTouches[0].pageY;
            },false);
            document.addEventListener ( "touchMove", function (E) {
                 var endY e.changedTouches = [0 ] .pageY;
                 var changeVal = endY - the startY is;
                 IF (endY <the startY is) { // slide up 
//                     the console.log ( " up slip "); 
                    that.showSearchFlag = to false 
                } the else  IF (endY> the startY is) { // slides down 
//                     the console.log (" slid down "); 
                    that.showSearchFlag = to true 
                } the else {
//                     the console.log ( "no offset"); 
                }
                 // Get the screen height 
                var A = || document.documentElement.scrollTop document.body.scrollTop ;;   // height of the scroll bar 
                var B = document.documentElement.clientHeight     // visible area height 
                var C = $ ( '# ListIndex') height ();.    // the total height of the document 
                IF (a + B> = C) {
                     // represents browser has reached the bottommost 
                    that.showSearchFlag = to true
                }
 
            },false);
        },