自动适应输入内容高度的TextBox控件(摘自罗永浩全集)

时间：2022-07-02 23:37:34 编辑：袖梨来源：一聚教程网

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

增高就行了。<br />    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： <br />     最大高度为200px的AutoTextBox Demo: <br />  <br />最大高度为200px但初始高度为3rows的AutoTextBox Demo: <br />  <br />高度增长无限制的AutoTextBox Demo: <br />  <br /> <br />    如果控件的MaxHeight属性小于或等于0，那么增长高度无限制。<br />附 AutoTextBox 控件源码#region 附 AutoTextBox 控件源码 <br />using System; <br />using System.Web.UI; <br />using System.Web.UI.WebControls; <br />using System.ComponentModel; <br /> <br />namespace Web<a href="http://www.111com.net/office/145249.htm" target="_blank">Excel</a>.UI.WebControls <br />{ <br />    /**//// <summary> <br />    /// Summary description for AutoLengthTextBox. <br />    /// </summary> <br />    [DefaultProperty("Text"),  <br />        ToolboxData("<{0}:AutoTextArea runat=server></{0}:AutoTextArea>")] <br />    public class AutoTextArea : System.Web.UI.WebControls.TextBox <br />    { <br />        [DefaultValue(200)] <br />        public int MaxHeight <br />        { <br />            get <br />            { <br />                object obj = ViewState["MaxHeight"]; <br />                return obj == null ? 200 : (int)obj; <br />            } <br />            set <br />            { <br />                ViewState["MaxHeight"] = value; <br />            } <br />        } <br /> <br />        [DefaultValue(60)] <br />        public int MinHeight <br />        { <br />

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自动适应输入内容高度的TextBox控件(摘自罗永浩全集)