自动适应输入内容高度的TextBox控件(摘自罗永浩全集)
2005-03-07 11:49
741 查看
关于Web开发上面UI布局的问题,我上次介绍了一个可以自动适应输入内容宽度的TextBox控件,它可以解决在布局时预留控件大小和用户数入内容多少上的矛盾。但是由于那个控件被限制了只能做为单行输入使用:(,在输入大块文本时就力不从心了,那么就再做一个可自动适应高度的TextBox。
原理和那个适应宽度的TextBox查不多,只是这个反而更加简单,因为在高度方向上增长不会破坏页面的整体布局效果(宽度上的如果在页内会挤走别的元素的),所以就不需要使用Agent TextBox来作为实际录入的容器了,直接把<TextArea>增高就行了。
响应onpropertychange事件,同步内容和<TextArea>的高度。当然如果完全根据内容增高可能也会因为内容太多而变得难看,就设置了一个最大高度限制属性。控件效果如下:
如果控件的MaxHeight属性小于或等于0,那么增长高度无限制。
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
附 AutoTextBox 控件源码#region 附 AutoTextBox 控件源码
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using System.Web.UI;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using System.Web.UI.WebControls;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using System.ComponentModel;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
namespace WebExcel.UI.WebControls
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// Summary description for AutoLengthTextBox.
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
[DefaultProperty("Text"),
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ToolboxData("<{0}:AutoTextArea runat=server></{0}:AutoTextArea>")]
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class AutoTextArea : System.Web.UI.WebControls.TextBox
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
[DefaultValue(200)]
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public int MaxHeight
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
object obj = ViewState["MaxHeight"];
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return obj == null ? 200 : (int)obj;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ViewState["MaxHeight"] = value;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
[DefaultValue(60)]
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public int MinHeight
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
object obj = ViewState["MinHeight"];
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return obj == null ? 60 : (int)obj;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ViewState["MinHeight"] = value;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected override void OnPreRender(EventArgs e)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
this.Attributes["minHeight"] = this.MinHeight.ToString();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ( this.Height == Unit.Empty )
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
this.Height = this.MinHeight;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
this.Height = (int)Math.Max(this.MinHeight, this.Height.Value);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.OnPreRender (e);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// Render this control to the output parameter specified.
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <param name="output"> The HTML writer to write out to </param>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected override void Render(HtmlTextWriter output)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string strCode;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ( this.MaxHeight <= 0 )
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
strCode = "this.style.height=Math.max(this.minHeight,this.scrollHeight)+(this.offsetHeight-this.clientHeight)";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
strCode = "this.style.height=(this.scrollHeight>200)?200:Math.max(this.minHeight,this.scrollHeight)+(this.offsetHeight-this.clientHeight)";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.Attributes["onpropertychange"] = strCode;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// base.Attributes["onfocus"] = "this.height=this.height";
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ( base.Rows == 0 )
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.Rows = 1;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.TextMode = TextBoxMode.MultiLine;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.Render(output);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
#endregion
原理和那个适应宽度的TextBox查不多,只是这个反而更加简单,因为在高度方向上增长不会破坏页面的整体布局效果(宽度上的如果在页内会挤走别的元素的),所以就不需要使用Agent TextBox来作为实际录入的容器了,直接把<TextArea>增高就行了。
响应onpropertychange事件,同步内容和<TextArea>的高度。当然如果完全根据内容增高可能也会因为内容太多而变得难看,就设置了一个最大高度限制属性。控件效果如下:
|
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
附 AutoTextBox 控件源码#region 附 AutoTextBox 控件源码
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using System.Web.UI;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using System.Web.UI.WebControls;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
using System.ComponentModel;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
namespace WebExcel.UI.WebControls
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// Summary description for AutoLengthTextBox.
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
[DefaultProperty("Text"),
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ToolboxData("<{0}:AutoTextArea runat=server></{0}:AutoTextArea>")]
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class AutoTextArea : System.Web.UI.WebControls.TextBox
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
[DefaultValue(200)]
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public int MaxHeight
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
object obj = ViewState["MaxHeight"];
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return obj == null ? 200 : (int)obj;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ViewState["MaxHeight"] = value;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
[DefaultValue(60)]
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public int MinHeight
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
object obj = ViewState["MinHeight"];
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return obj == null ? 60 : (int)obj;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ViewState["MinHeight"] = value;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected override void OnPreRender(EventArgs e)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
this.Attributes["minHeight"] = this.MinHeight.ToString();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ( this.Height == Unit.Empty )
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
this.Height = this.MinHeight;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
this.Height = (int)Math.Max(this.MinHeight, this.Height.Value);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.OnPreRender (e);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// Render this control to the output parameter specified.
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// </summary>
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// <param name="output"> The HTML writer to write out to </param>
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected override void Render(HtmlTextWriter output)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string strCode;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ( this.MaxHeight <= 0 )
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
strCode = "this.style.height=Math.max(this.minHeight,this.scrollHeight)+(this.offsetHeight-this.clientHeight)";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
strCode = "this.style.height=(this.scrollHeight>200)?200:Math.max(this.minHeight,this.scrollHeight)+(this.offsetHeight-this.clientHeight)";
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.Attributes["onpropertychange"] = strCode;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
// base.Attributes["onfocus"] = "this.height=this.height";
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ( base.Rows == 0 )
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.Rows = 1;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.TextMode = TextBoxMode.MultiLine;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
base.Render(output);
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
#endregion
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