javascript - MGWT ScrollPanel.scrollTo(0, y) 导致无法读取未定义的属性 'style'

Question

我使用 MGWT 的 ScrollPanel 并执行以下操作:

  private void scrollToBottom() {
    if (getUiHandlers().isVisible()) {
      final int height = scrollPanel.getOffsetHeight();
      final int heightInt = cellList.getOffsetHeight();
      final int y = scrollPanel.getMaxScrollY();

      if (heightInt >= height) {
          scrollPanel.scrollTo(0, y);
      }
    }
  }

说到这一行:

scrollPanel.scrollTo(0, y)

我收到以下错误:

UncaughtException: (TypeError) : Cannot read property 'style' of undefined 
UncaughtException details: setDelay_1_g$
UncaughtException details: setTransitionsDelay_0_g$ 
UncaughtException details: scrollbarPos_0_g$ 
UncaughtException details: pos_1_g$ 
UncaughtException details: execute_30_g$ 
UncaughtException details: startAnimation_0_g$ 
UncaughtException details: scrollTo_7_g$
UncaughtException details: scrollTo_6_g$
UncaughtException details: scrollTo_5_g$ 
UncaughtException details: scrollTo_3_g$ 

我怎样才能避免这个错误？

Answer 1

从源代码和堆栈跟踪来看，您似乎遇到了滚动条问题。当您调用 scrollTo 时，您的 mgwt 滚动面板是否总是有滚动条？

此外，我强烈建议您将 scrollPanel.scrollTo(0, y); 调用包装到 Scheduler.get().scheduleDeffered(..your scrollTo call here在此处输入代码..)