How to set time scale zoom in ChartJS?

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  I'm doing an app that displays daily personal work data. I store the data in an array called "dailyTimePerProjectPerWeek", for now I define the data for 3 weeks. I have placed two buttons in the html, "Previous Week" and "Next Week", to navigate between the weeks. When the page is loaded for the first time it shows the most recent week corresponding to the highest index of the array mentioned above. The problem is that it does something strange to me to visualize the data, it's like that I created several charts. How can I refresh the image of the chart properly? There goes my html code:

  <!DOCTYPE html>
  <html lang="en" >
  
  <head>
    <meta charset="UTF-8">
    <title>Charts4DailyProgress</title>
  
  
  
        <link rel="stylesheet" href="css/style.css">
  
  
  </head>
  
  <body>
  
  
  <body>
  <h1>Weekly Time per Project</h1>
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  <canvas id="ctx" width="1000"></canvas>
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  <button type="button" onclick="incrementWeek()">Next Week</button>
  
    </div>
  
    <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
    <script  src="js/index.js"></script>
  
  </body>
  
  
  </html>
  

  There goes my javascript code:

  var dailyTimePerProjectPerWeek =[];
  dailyTimePerProjectPerWeek[0] = {
        labels: ['M', 'TU','W','TH','F','SA','SU'], // responsible for how many bars are gonna show on the chart
        // create 12 datasets, since we have 12 items
        // data[0] = labels[0] (data for first bar - 'Standing costs') | data[1] = labels[1] (data for second bar - 'Running costs')
        // put 0, if there is no data for the particular bar
        datasets: [{
           label: 'Master Project. Second Part',
           data: [300, 480, 360,180, 240, 300,480],
           backgroundColor: '#D4AF37'
        }, {
           label: 'Guild Ideas - Learning Angular',
           data: [60, 0, 240, 180, 120, 0, 60],
           backgroundColor: '#C0C0C0'
        }, {
           label: 'Charts For Daily Progress',
           data: [60, 180, 120, 180, 120, 120, 0],
           backgroundColor: '#133a7c'
        }, {
           label: 'Project Manager',
           data: [120, 180, 120, 120, 0],
           backgroundColor: '#109618'
        }, {
           label: 'TOOYS',
           data: [0, 180, 120, 0, 120, 0,0],
           backgroundColor: '#990099'
        }, {
           label: 'Web Pc Explorer',
           data: [0, 0, 120, 180, 0, 120, 0],
           backgroundColor: '#54161F'
        }, {
           label: 'Mind Maps Program',
           data: [0, 0, 180, 180, 0, 0, 0],
           backgroundColor: '#708238'
        }, {
           label: 'Chain System',
           data: [0, 0, 180, 0, 0, 0],
           backgroundColor: '#E86100'
        }, {
           label: 'Code Generator',
           data: [60, 0, 0, 0, 0, 0],
           backgroundColor: '#F81894'
        }, {
           label: 'Electronic Brain',
           data: [0, 0, 0, 0, 0, 0,240],
           backgroundColor: '#6cc4ee'
        }]
     }
  
  dailyTimePerProjectPerWeek[1] = {
        labels: ['M', 'TU','W','TH','F','SA','SU'], // responsible for how many bars are gonna show on the chart
        // create 12 datasets, since we have 12 items
        // data[0] = labels[0] (data for first bar - 'Standing costs') | data[1] = labels[1] (data for second bar - 'Running costs')
        // put 0, if there is no data for the particular bar
        datasets: [{
           label: 'Master Project. Second Part',
           data: [0, 480, 360,180, 240, 300,480],
           backgroundColor: '#D4AF37'
        }, {
           label: 'Guild Ideas - Learning Angular',
           data: [0, 0, 240, 180, 120, 0, 60],
           backgroundColor: '#C0C0C0'
        }, {
           label: 'Charts For Daily Progress',
           data: [0, 180, 120, 180, 120, 120, 0],
           backgroundColor: '#133a7c'
        }, {
           label: 'Project Manager',
           data: [0, 180, 120, 120, 0],
           backgroundColor: '#109618'
        }, {
           label: 'TOOYS',
           data: [0, 180, 120, 0, 120, 0,0],
           backgroundColor: '#990099'
        }, {
           label: 'Web Pc Explorer',
           data: [0, 0, 120, 180, 0, 120, 0],
           backgroundColor: '#54161F'
        }, {
           label: 'Mind Maps Program',
           data: [0, 0, 180, 180, 0, 0, 0],
           backgroundColor: '#708238'
        }, {
           label: 'Chain System',
           data: [0, 0, 180, 0, 0, 0],
           backgroundColor: '#E86100'
        }, {
           label: 'Code Generator',
           data: [0, 0, 0, 0, 0, 0],
           backgroundColor: '#F81894'
        }, {
           label: 'Electronic Brain',
           data: [0, 0, 0, 0, 0, 0,240],
           backgroundColor: '#6cc4ee'
        }]
     }
  dailyTimePerProjectPerWeek[2] = {
        labels: ['M', 'TU','W','TH','F','SA','SU'], // responsible for how many bars are gonna show on the chart
        // create 12 datasets, since we have 12 items
        // data[0] = labels[0] (data for first bar - 'Standing costs') | data[1] = labels[1] (data for second bar - 'Running costs')
        // put 0, if there is no data for the particular bar
        datasets: [{
           label: 'Master Project. Second Part',
           data: [300, 480, 360,180, 240, 300,0],
           backgroundColor: '#D4AF37'
        }, {
           label: 'Guild Ideas - Learning Angular',
           data: [60, 0, 240, 180, 120, 0, 0],
           backgroundColor: '#C0C0C0'
        }, {
           label: 'Charts For Daily Progress',
           data: [60, 180, 120, 180, 120, 120, 0],
           backgroundColor: '#133a7c'
        }, {
           label: 'Project Manager',
           data: [120, 180, 120, 120, 0],
           backgroundColor: '#109618'
        }, {
           label: 'TOOYS',
           data: [0, 180, 120, 0, 120, 0,0],
           backgroundColor: '#990099'
        }, {
           label: 'Web Pc Explorer',
           data: [0, 0, 120, 180, 0, 120, 0],
           backgroundColor: '#54161F'
        }, {
           label: 'Mind Maps Program',
           data: [0, 0, 180, 180, 0, 0, 0],
           backgroundColor: '#708238'
        }, {
           label: 'Chain System',
           data: [0, 0, 180, 0, 0, 0],
           backgroundColor: '#E86100'
        }, {
           label: 'Code Generator',
           data: [60, 0, 0, 0, 0, 0],
           backgroundColor: '#F81894'
        }, {
           label: 'Electronic Brain',
           data: [0, 0, 0, 0, 0, 0,0],
           backgroundColor: '#6cc4ee'
        }]
     }
  
  
  var currentWeek = dailyTimePerProjectPerWeek.length - 1;
  var weekValue = currentWeek; //At first time weekValue points to the current week
  
  function drawData(){
  var chart = new Chart(ctx, {
     type: 'bar',
     data: dailyTimePerProjectPerWeek[weekValue],
     options: {
        responsive: false,
        legend: {
           position: 'right' // place legend on the right side of chart
        },
        scales: {
           xAxes: [{
              stacked: true // this should be set to make the bars stacked
           }],
           yAxes: [{
              stacked: true // this also..
           }]
        }
     }
  });
  }
  
  function incrementWeek(){
   if(weekValue === dailyTimePerProjectPerWeek.length - 1){
     console.log("This is the current week");
   } else {
    weekValue += 1;
    drawData();
   }
  }
  
  function decrementWeek(){
   if(weekValue === 0){
     console.log("This is the oldest week of the time series");
   } else {
    weekValue -= 1;
    drawData();
   }
  }
  
  
  
  /*
  function selectWeek(){
  
  }
  */
  
  /*
  function fixWeek(){
  
  
  
  
  }*/
  //Main Program
  var chart = new Chart(ctx, {
     type: 'bar',
     data: dailyTimePerProjectPerWeek[weekValue],
     options: {
        responsive: false,
        legend: {
           position: 'right' // place legend on the right side of chart
        },
        scales: {
           xAxes: [{
              stacked: true // this should be set to make the bars stacked
           }],
           yAxes: [{
              stacked: true // this also..
           }]
        }
     }
  });
  

  The truth is that I use the following code to try to refresh the image:

  function drawData(){
  var chart = new Chart(ctx, {
     type: 'bar',
     data: dailyTimePerProjectPerWeek[weekValue],
     options: {
        responsive: false,
        legend: {
           position: 'right' // place legend on the right side of chart
        },
        scales: {
           xAxes: [{
              stacked: true // this should be set to make the bars stacked
           }],
           yAxes: [{
              stacked: true // this also..
           }]
        }
     }
  });
  }
  
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        scales: {
          xAxes: [{
              stacked: true
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          yAxes: [{
              stacked: true
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      private var mSelectionListener: SelectionListener? = null
      private var mSelectionDragLayer: DragLayer? = null
      private var mDragController: DragController? = null
      private var mStartSelectionHandle: ImageView? = null
      private var mEndSelectionHandle: ImageView? = null
      private var mSelectionBounds: Rect? = null
      private val mSelectionBoundsTemp = Rect()
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      private var mContentWidth = 0
      private var mLastTouchedSelectionHandle = HandleType.UNKNOWN
      private var mScrolling = false
      private var mScrollDiffY = 0f
      private var mLastTouchY = 0f
      private var mScrollDiffX = 0f
      private var mLastTouchX = 0f
      private var mScale = 1.0f
      private var quickActionView: WebView? = null
      private var quickActionRect: Rect? = null
  
      fun getQuickActionView(): WebView {
          return quickActionView!!
      }
  
      fun setQuickActionView(quickActionView: WebView) {
          this.quickActionView = quickActionView
      }
  
      fun getQuickActionRect(): Rect {
          return quickActionRect!!
      }
  
      fun setQuickActionRect(quickActionRect: Rect) {
          this.quickActionRect = quickActionRect
      }
  
  
      private val mStartSelectionModeHandler = Runnable {
          if (mSelectionBounds != null) {
              mWebView.addView(mSelectionDragLayer)
              drawSelectionHandles()
  
              val contentHeight = Math.ceil(getDensityDependentValue(mWebView.getContentHeight().toFloat(), mActivity).toDouble()).toInt()
  
              val contentWidth = mWebView.getWidth()
              val layerParams = mSelectionDragLayer!!.getLayoutParams()
              layerParams.height = contentHeight
              layerParams.width = Math.max(contentWidth, mContentWidth)
              mSelectionDragLayer!!.setLayoutParams(layerParams)
              if (mSelectionListener != null) {
                  mSelectionListener!!.startSelection()
              }
          }
      }
      private val endSelectionModeHandler = Runnable {
          mWebView.removeView(mSelectionDragLayer)
          mSelectionBounds = null
          mLastTouchedSelectionHandle = HandleType.UNKNOWN
          mWebView.loadUrl("javascript: android.selection.clearSelection();")
          if (mSelectionListener != null) {
              mSelectionListener!!.endSelection()
          }
      }
      private val drawSelectionHandlesHandler = Runnable {
  
          val startParams = mStartSelectionHandle!!.getLayoutParams() as MyAbsoluteLayout.LayoutParams
          val startWidth = mStartSelectionHandle!!.getDrawable().getIntrinsicWidth()
          startParams.x = (mSelectionBounds!!.left - startWidth * (1.0f - CENTERING_SHORTER_MARGIN_RATIO)).toInt()
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              rect.right = (getDensityDependentValue(selectionBoundsObject.getInt("right").toFloat(), ctx) * scale).toInt()
              rect.bottom = (getDensityDependentValue(selectionBoundsObject.getInt("bottom").toFloat(), ctx) * scale).toInt()
              mSelectionBounds = rect
              if (!isInSelectionMode) {
                  startSelectionMode()
                  setQuickActionRect(rect)
                  setQuickActionView(mWebView)
              }
              drawSelectionHandles()
              if (mSelectionListener != null && isReallyChanged) {
                  mSelectionListener!!.selectionChanged(text)
              }
          } catch (e: JSONException) {
              e.printStackTrace()
          }
  
      }
  
      //
      // Interface of OnTouchListener
      //
      override fun onTouch(v: View, event: MotionEvent): Boolean {
          val ctx = mActivity
          val xPoint = getDensityIndependentValue(event.x, ctx) / getDensityIndependentValue(mScale, ctx)
          val yPoint = getDensityIndependentValue(event.y, ctx) / getDensityIndependentValue(mScale, ctx)
  
          when (event.getAction()) {
              MotionEvent.ACTION_DOWN -> {
                  // Essential to add Locale.US parameter to String.format, else does not work on systems
                  // with default locale different, with other floating point notations, e.g. comma instead
                  // of decimal point.
                  val startTouchUrl = String.format(Locale.US, "javascript:android.selection.startTouch(%f, %f);", xPoint, yPoint)
                  mLastTouchX = xPoint
                  mLastTouchY = yPoint
                  mWebView.loadUrl(startTouchUrl)
              }
              MotionEvent.ACTION_UP -> {
                  if (!mScrolling) {
                      endSelectionMode()
                      //
                      // Fixes 4.4 double selection
                      // See: http://stackoverflow.com/questions/20391783/how-to-avoid-default-selection-on-long-press-in-android-kitkat-4-4
                      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                          return false
                      }
                  }
                  mScrollDiffX = 0f
                  mScrollDiffY = 0f
                  mScrolling = false
                  //
                  // Fixes 4.4 double selection
                  // See: http://stackoverflow.com/questions/20391783/how-to-avoid-default-selection-on-long-press-in-android-kitkat-4-4
                  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && isInSelectionMode) {
                      return true
                  }
              }
              MotionEvent.ACTION_MOVE -> {
                  mScrollDiffX += xPoint - mLastTouchX
                  mScrollDiffY += yPoint - mLastTouchY
                  mLastTouchX = xPoint
                  mLastTouchY = yPoint
                  if (Math.abs(mScrollDiffX) > SCROLLING_THRESHOLD || Math.abs(mScrollDiffY) > SCROLLING_THRESHOLD) {
                      mScrolling = true
                  }
              }
          }
          return false
      }
  
      //
      // Interface of OnLongClickListener
      //
      override fun onLongClick(v: View): Boolean {
          if (!isInSelectionMode) {
              mWebView.loadUrl("javascript:android.selection.longTouch();")
              mScrolling = true
          }
          return true
      }
  
      //
      // Interface of DragListener
      //
      override fun onDragStart(source: DragSource, info: Any, dragBehavior: DragController.DragBehavior) {
  
      }
  
      override fun onDragEnd() {
          mActivity.runOnUiThread {
              val startHandleParams = mStartSelectionHandle!!.layoutParams as MyAbsoluteLayout.LayoutParams
              val endHandleParams = mEndSelectionHandle!!.layoutParams as MyAbsoluteLayout.LayoutParams
              val ctx = mActivity
              val scale = getDensityIndependentValue(mScale, ctx)
              var startX = startHandleParams.x - mWebView.scrollX + mStartSelectionHandle!!.width * (1 - CENTERING_SHORTER_MARGIN_RATIO)
              var startY: Float = startHandleParams.y - mWebView.scrollY - JACK_UP_PADDING.toFloat()
              var endX = endHandleParams.x - mWebView.scrollX + mEndSelectionHandle!!.width * CENTERING_SHORTER_MARGIN_RATIO
              var endY: Float = (endHandleParams.y - mWebView.getScrollY() - JACK_UP_PADDING).toFloat()
              startX = getDensityIndependentValue(startX, ctx) / scale
              startY = (getDensityIndependentValue(startY.toFloat(), ctx) / scale)
              endX = getDensityIndependentValue(endX, ctx) / scale
              endY = getDensityIndependentValue(endY, ctx) / scale
              if (mLastTouchedSelectionHandle == HandleType.START && startX > 0 && startY > 0) {
                  val saveStartString = String.format(Locale.US, "javascript: android.selection.setStartPos(%f, %f);",
                          startX, startY)
                  mWebView.loadUrl(saveStartString)
              } else if (mLastTouchedSelectionHandle == HandleType.END && endX > 0 && endY > 0) {
                  val saveEndString = String.format(Locale.US, "javascript: android.selection.setEndPos(%f, %f);",
                          endX
                          , endY)
                  mWebView.loadUrl(saveEndString)
              } else {
                  mWebView.loadUrl("javascript: android.selection.restoreStartEndPos();")
              }
          }
      }
  
      @SuppressLint("SetJavaScriptEnabled", "JavascriptInterface")
      private fun setup() {
          mScale = mActivity.getResources().getDisplayMetrics().density
          mWebView.setOnLongClickListener(this)
          mWebView.setOnTouchListener(this)
          val settings = mWebView.settings
  
          settings.setJavaScriptEnabled(true)
          settings.setJavaScriptCanOpenWindowsAutomatically(true)
          mSelectionController = TextSelectionController(this)
          mWebView.addJavascriptInterface(mSelectionController!!, TextSelectionController.INTERFACE_NAME)
          createSelectionLayer(mActivity)
      }
  
      private fun createSelectionLayer(context: Context) {
          val inflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
          mSelectionDragLayer = inflater.inflate(R.layout.selection_drag_layer, null) as DragLayer
          mDragController = DragController(context)
          mDragController!!.setDragListener(this)
          mDragController!!.addDropTarget(mSelectionDragLayer!!)
          mSelectionDragLayer!!.setDragController(mDragController!!)
  
          mStartSelectionHandle = mSelectionDragLayer!!.findViewById<ImageView>(R.id.startHandle) as ImageView
          mStartSelectionHandle!!.setTag(HandleType.START)
          mEndSelectionHandle = mSelectionDragLayer!!.findViewById<ImageView>(R.id.endHandle) as ImageView
          mEndSelectionHandle!!.setTag(HandleType.END)
          val handleTouchListener = View.OnTouchListener { v, event ->
              var handledHere = false
              if (event.action == MotionEvent.ACTION_DOWN) {
                  handledHere = startDrag(v)
  
                  mLastTouchedSelectionHandle = v.tag as HandleType
              }
              handledHere
          }
          mStartSelectionHandle!!.setOnTouchListener(handleTouchListener)
          mEndSelectionHandle!!.setOnTouchListener(handleTouchListener)
      }
  
      private fun drawSelectionHandles() {
          mActivity.runOnUiThread(drawSelectionHandlesHandler)
      }
  
      private fun startDrag(v: View): Boolean {
          mDragController!!.startDrag(v, mSelectionDragLayer!!, v, DragController.DragBehavior.MOVE)
          return true
      }
  
      private fun getDensityDependentValue(`val`: Float, ctx: Context): Float {
          val display = (ctx.getSystemService(Context.WINDOW_SERVICE) as WindowManager).getDefaultDisplay()
          val metrics = DisplayMetrics()
          display.getMetrics(metrics)
          return `val` * (metrics.densityDpi / 160f)
      }
  
      private fun getDensityIndependentValue(`val`: Float, ctx: Context): Float {
          val display = (ctx.getSystemService(Context.WINDOW_SERVICE) as WindowManager).getDefaultDisplay()
          val metrics = DisplayMetrics()
          display.getMetrics(metrics)
          return `val` / (metrics.densityDpi / 160f)
      }
  
      companion object {
          private val TAG = "SelectionSupport"
          private val CENTERING_SHORTER_MARGIN_RATIO = 12.0f / 48.0f
          private val JACK_UP_PADDING = 2
          private val SCROLLING_THRESHOLD = 10
          fun support(activity: Activity, webview: WebView): TextSelectionSupport {
              val selectionSupport = TextSelectionSupport(activity, webview)
              selectionSupport.setup()
              return selectionSupport
          }
      }
  }
  

  webViewHandle which used in Fragment to get selected text

   private fun setWebViewHandler(str: String, bookElementID: Int) {
          val baseUrl = "file:///android_asset/"
          with(web_details) {
              loadDataWithBaseURL(baseUrl, str, "text/html", "utf-8", "")
              webViewClient = object : WebViewClient() {
                  override fun shouldOverrideUrlLoading(view: WebView, url: String?): Boolean {
                      return if (url != null) {
                          view.context.startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(url)))
                          true
                      } else {
                          false
                      }
  
                  }
  
                  override fun onScaleChanged(view: WebView, oldScale: Float, newScale: Float) {
                      Log.i("newScale",oldScale.toString() + " "+newScale.toString())
                      mTextSelectionSupport!!.onScaleChanged(oldScale, newScale)
  
                  }
  
              }
  
          }
          if (Auth.isMobile) {
              viewModel.initSearchViewWithWeb.postValue(script)
          } else {
              setWebViewSearch()
          }
          mTextSelectionSupport!!.setSelectionListener(object : TextSelectionSupport.SelectionListener {
                      override fun startSelection() {
                          Timber.i("start")
                      }
  
                      override fun selectionChanged(text: String) {
                          Log.i("textSelection",text)
                          script!!.selectTextHtml()
                          initializeNotePopUp(text)
                          BooksActivity.selectedText = text
                          Log.i("slecet", "show popup")
                      }
  
                      override fun endSelection() {}
                  })
      }
  
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