先看上代码
<body>
<ext:ResourceManager ID="ResourceManager1" runat="server" DirectMethodNamespace="X"
IDMode="Explicit" InitScriptMode="Linked" />
<form id="form1" runat="server">
<ext:Viewport runat="server" ID="vwpLayout" Layout="fit">
<Items>
<ext:GridPanel runat="server" ID="grdMain" Layout="fit" Border="false" AutoScroll="true" AutoHeight="false">
<TopBar>
<ext:Toolbar runat="server">
<Items>
<ext:Button runat="server" ID="btnAdd" IconCls="add-css" Text="新 增">
</ext:Button>
<ext:Button runat="server" ID="btnSearch" IconCls="search-css" Text="查 询">
</ext:Button>
<ext:Button runat="server" ID="btnBatchDelete" IconCls="remove-css" Text="批量删除">
</ext:Button>
</Items>
</ext:Toolbar>
</TopBar>
<SelectionModel>
<ext:CheckboxSelectionModel runat="server" SingleSelect="false" Sortable="false">
</ext:CheckboxSelectionModel>
</SelectionModel>
<LoadMask Msg="正在载入……" ShowMask="true" />
<ColumnModel DefaultSortable="true" runat="server" ID="colmMain">
<Columns>
<ext:RowNumbererColumn Align="Right" Resizable="false">
</ext:RowNumbererColumn>
<ext:NumberColumn Align="Left" DataIndex="FDegreeCode" Editable="false" Header="编 码"
Format="0">
</ext:NumberColumn>
<ext:Column Align="Left" DataIndex="FDegreeName" Editable="false" Header="名 称">
</ext:Column>
</Columns>
</ColumnModel>
<Store>
<ext:Store runat="server" ID="storeMain">
<Reader>
<ext:JsonReader IDProperty="FDegreeCode">
<Fields>
<ext:RecordField Name="FDegreeCode" Type="Int">
</ext:RecordField>
<ext:RecordField Name="FDegreeName">
</ext:RecordField>
</Fields>
</ext:JsonReader>
</Reader>
</ext:Store>
</Store>
</ext:GridPanel>
</Items>
<ext:ResourceManager ID="ResourceManager1" runat="server" DirectMethodNamespace="X"
IDMode="Explicit" InitScriptMode="Linked" />
<form id="form1" runat="server">
<ext:Viewport runat="server" ID="vwpLayout" Layout="fit">
<Items>
<ext:GridPanel runat="server" ID="grdMain" Layout="fit" Border="false" AutoScroll="true" AutoHeight="false">
<TopBar>
<ext:Toolbar runat="server">
<Items>
<ext:Button runat="server" ID="btnAdd" IconCls="add-css" Text="新 增">
</ext:Button>
<ext:Button runat="server" ID="btnSearch" IconCls="search-css" Text="查 询">
</ext:Button>
<ext:Button runat="server" ID="btnBatchDelete" IconCls="remove-css" Text="批量删除">
</ext:Button>
</Items>
</ext:Toolbar>
</TopBar>
<SelectionModel>
<ext:CheckboxSelectionModel runat="server" SingleSelect="false" Sortable="false">
</ext:CheckboxSelectionModel>
</SelectionModel>
<LoadMask Msg="正在载入……" ShowMask="true" />
<ColumnModel DefaultSortable="true" runat="server" ID="colmMain">
<Columns>
<ext:RowNumbererColumn Align="Right" Resizable="false">
</ext:RowNumbererColumn>
<ext:NumberColumn Align="Left" DataIndex="FDegreeCode" Editable="false" Header="编 码"
Format="0">
</ext:NumberColumn>
<ext:Column Align="Left" DataIndex="FDegreeName" Editable="false" Header="名 称">
</ext:Column>
</Columns>
</ColumnModel>
<Store>
<ext:Store runat="server" ID="storeMain">
<Reader>
<ext:JsonReader IDProperty="FDegreeCode">
<Fields>
<ext:RecordField Name="FDegreeCode" Type="Int">
</ext:RecordField>
<ext:RecordField Name="FDegreeName">
</ext:RecordField>
</Fields>
</ext:JsonReader>
</Reader>
</ext:Store>
</Store>
</ext:GridPanel>
</Items>
<Listeners>
<AfterLayout Handler="#{grdMain}.setHeight(#{vwpLayout}.getHeight());" />
</Listeners>
</ext:Viewport></form></body>
请注意文中红色加粗部分
主要原理为在GridPanel 对象的父容器中添加AfterLayout监听事件，并在监听事件中重新设置GridPanel高度；
GridPanel 的AutoHeight属性不能为true，否则代码将无效。
