闲来无事,学习了下红皮书《ASP.NET组件工具包》中第1章“微调控件”,将其VB.NET代码改写为C#代码,并作了较详细的注释,实现了一个类似WinForm中NumericUpDown的微调控件。先总结一下开发中的问题和经验......
闲来无事,学习了下红皮书《ASP.NET组件工具包》中第1章“微调控件”,将其VB.NET代码改写为C#代码,并作了较详细的注释,实现了一个类似WinForm中NumericUpDown的微调控件。
效果图如右:![](/images/cnblogs_com/bluesky521/spinner1.jpg)
先总结一下开发中的问题和经验:
1.注意:将控件项目的“属性”-->“通用属性”-->“常规”中的“默认命名空间”设为空,否则总出现错误:“System.ArgumentException: 已存在具有相同键的条目。”
哪位高手知道原因的话请赐教。???
2.注意:将.js文件和.bmp文件作为嵌入资源进行编译。方法:在“解决方案资源管理器”中选中文件,右键“属性”,在属性框中“生成操作”项中选择“嵌入的资源”,随后编译该项目即可。
3.注意:.bmp文件是作为控件的自定义图标显示在工具箱中的(如果你把控件添加到工具箱中的话),该文件要求必须与控件同名(如本程序中的命名为:Xct.WebControls.Spinner.bmp),且带.bmp后缀。
4.将控件添加到工具箱中的方法:VS2003-IDE菜单“工具”-->“添加/移除工具箱项...”,在“.NET Framework组件”选项卡中点击“浏览”,选择控件对应的dll文件后点击“确定”。在工具箱的“常规”选项卡中就出现新添的控件,如图
。
5.优点:该控件在编译时将JS脚本资源嵌入到了程序集dll文件中,使得在布暑应用时不需要再拷贝js文件。
6.问题:该控件的属性“TextAlign - 文本对齐方式”不起作用,不知怎么回事。???
运行环境:Win2003Server + IIS6 + VS2003 + .NET Framework 1.1 + IE6
附:《ASP.NET组件工具包》书中的代码可以在http://support.apress.com/books.asp?bID=1861008023&s=0下载.(注:在www.wrox.com找不到其源码下载)
===============================================================================
控件程序代码(Spinner.cs):----
1
using System;
2
using System.Web.UI;
3
using System.Web.UI.WebControls;
4
using System.ComponentModel;
5
using System.IO;
6![](/Images/OutliningIndicators/None.gif)
7![](/Images/OutliningIndicators/None.gif)
8
//指定控件的标记前缀
9
[assembly: TagPrefix("Xct.WebControls","xct")]
10
namespace Xct.WebControls
11![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](/Images/OutliningIndicators/ContractedBlock.gif)
{
12![](/Images/OutliningIndicators/ContractedSubBlock.gif)
枚举类型#region 枚举类型
13![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
14
/// 滚动箭头的位置,可以在文本框左侧或右侧
15
/// </summary>
16
public enum SpinnerAlign
17![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
18
Left = 0,
19
Right = 1
20
}
21![](/Images/OutliningIndicators/InBlock.gif)
22![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
23
/// 文本框中的文本对齐方式
24
/// </summary>
25
public enum ValueAlign
26![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
27
Center = 0,
28
Left = 1,
29
Right = 2
30
}
31
#endregion
32![](/Images/OutliningIndicators/InBlock.gif)
33![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
34
/// ** 微调控件V1.0 ** (夏春涛 2007-09-26) **
35
/// </summary>
36
37
[ToolboxData("<{0}:Spinner runat=\"server\" width=\"80px\" buttonsize=\"XX-Small\" />")]
38
public class Spinner : WebControl, INamingContainer
39![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
40![](/Images/OutliningIndicators/ContractedSubBlock.gif)
脚本资源变量#region 脚本资源变量
41
//Scripts变量用于存储脚本资源
42
private static string Scripts;
43
//StartupScriptFormat变量用于存储初始化微调控件的脚本资源
44![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
private static string StartupScriptFormat = "<script language=\"JavaScript\">t = document.getElementById(\"
{0}\"); t.step = {1}; t.original = {2}; t.max = {3}; t.min = {4};</script>";
45
#endregion
46![](/Images/OutliningIndicators/InBlock.gif)
47![](/Images/OutliningIndicators/ContractedSubBlock.gif)
静态构造函数#region 静态构造函数
48![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
49
/// 静态构造函数,从程序集中提取脚本资源字符串,并将之存入Scripts变量
50
/// </summary>
51
static Spinner()
52![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
53
//获取当前代码正从中运行的 System.Reflection.Assembly
54
System.Reflection.Assembly asm = System.Reflection.Assembly.GetExecutingAssembly();
55![](/Images/OutliningIndicators/InBlock.gif)
56
if (asm != null)
57![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
58
string resource = "SpinnerLib.js";
59
Stream stm = asm.GetManifestResourceStream(resource);//从程序集加载指定的清单资源
60
if (stm==null) return;
61![](/Images/OutliningIndicators/InBlock.gif)
62
try
63![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
64
StreamReader reader = new StreamReader(stm);
65
Scripts = reader.ReadToEnd();
66
reader.Close();
67
}
68
finally
69![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
70
if (stm != null) stm.Close();
71
}
72![](/Images/OutliningIndicators/InBlock.gif)
73
}
74
}
75
#endregion
76![](/Images/OutliningIndicators/InBlock.gif)
77![](/Images/OutliningIndicators/ContractedSubBlock.gif)
属性定义#region 属性定义
78
79![](/Images/OutliningIndicators/ContractedSubBlock.gif)
Increment - 步长#region Increment - 步长
80
private int _inc = 1;
81![](/Images/OutliningIndicators/InBlock.gif)
82
[Bindable(true),Category("Data"),DefaultValue(1),Description("步长")]
83
public int Increment
84![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
85
get
86![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
87
return _inc;
88
}
89![](/Images/OutliningIndicators/InBlock.gif)
90
set
91![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
92
_inc = value;
93
}
94
}
95
#endregion
96![](/Images/OutliningIndicators/InBlock.gif)
97![](/Images/OutliningIndicators/ContractedSubBlock.gif)
Value - 值#region Value - 值
98
private int _value = 0;
99![](/Images/OutliningIndicators/InBlock.gif)
100
[Bindable(true),Category("Appearance"),DefaultValue(0),Description("值")]
101
public int Value
102![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
103
get
104![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
105
return _value;
106
}
107![](/Images/OutliningIndicators/InBlock.gif)
108
set
109![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
110
_value = value;
111
base.ChildControlsCreated = false;
112
}
113
}
114
#endregion
115![](/Images/OutliningIndicators/InBlock.gif)
116![](/Images/OutliningIndicators/ContractedSubBlock.gif)
Maximum - 最大值#region Maximum - 最大值
117
private int _max = 100;
118![](/Images/OutliningIndicators/InBlock.gif)
119
[Bindable(true),Category("Data"),DefaultValue(100),Description("最大值")]
120
public int Maximum
121![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
122
get
123![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
124
return _max;
125
}
126![](/Images/OutliningIndicators/InBlock.gif)
127
set
128![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
129
_max = value;
130
}
131
}
132
#endregion
133
134![](/Images/OutliningIndicators/ContractedSubBlock.gif)
Minimum - 最小值#region Minimum - 最小值
135
private int _min = 0;
136![](/Images/OutliningIndicators/InBlock.gif)
137
[Bindable(true),Category("Data"),DefaultValue(0),Description("最小值")]
138
public int Minimum
139![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
140
get
141![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
142
return _min;
143
}
144![](/Images/OutliningIndicators/InBlock.gif)
145
set
146![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
147
_min = value;
148
}
149
}
150
#endregion
151![](/Images/OutliningIndicators/InBlock.gif)
152![](/Images/OutliningIndicators/ContractedSubBlock.gif)
ButtonAlign - 按钮位置#region ButtonAlign - 按钮位置
153
private SpinnerAlign _align = SpinnerAlign.Right;
154![](/Images/OutliningIndicators/InBlock.gif)
155
[Bindable(true),Category("Layout"),DefaultValue(SpinnerAlign.Right),Description("按钮位置")]
156
public SpinnerAlign ButtonAlign
157![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
158
get
159![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
160
return _align;
161
}
162![](/Images/OutliningIndicators/InBlock.gif)
163
set
164![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
165
if (!Enum.IsDefined(Type.GetType("Xct.WebControls.SpinnerAlign"),value))
166
throw new ArgumentException();
167![](/Images/OutliningIndicators/InBlock.gif)
168
//将基类的ChildControlsCreated设为false,为此需要重写ChildControlsCreated方法,
169
//该方法用于构建组成界面的子控件的层次结构
170
base.ChildControlsCreated = false;
171
_align = value;
172
}
173
}
174
#endregion
175![](/Images/OutliningIndicators/InBlock.gif)
176![](/Images/OutliningIndicators/ContractedSubBlock.gif)
TextAlign - 文本对齐方式#region TextAlign - 文本对齐方式
177
private ValueAlign _textalign = ValueAlign.Right;
178![](/Images/OutliningIndicators/InBlock.gif)
179
[Bindable(true),Category("Layout"),DefaultValue(ValueAlign.Right),Description("文本对齐方式")]
180
public ValueAlign TextAlign
181![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
182
get
183![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
184
return _textalign;
185
}
186![](/Images/OutliningIndicators/InBlock.gif)
187
set
188![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
189
if (!Enum.IsDefined(Type.GetType("Xct.WebControls.ValueAlign"),value))
190
throw new ArgumentException();
191![](/Images/OutliningIndicators/InBlock.gif)
192
//将基类的ChildControlsCreated设为false,为此需要重写ChildControlsCreated方法,
193
//该方法用于构建组成界面的子控件的层次结构
194
base.ChildControlsCreated = false;
195
_textalign = value;
196
}
197
}
198
#endregion
199![](/Images/OutliningIndicators/InBlock.gif)
200![](/Images/OutliningIndicators/ContractedSubBlock.gif)
ButtonSize - 按钮字体大小#region ButtonSize - 按钮字体大小
201
private FontUnit _size;
202![](/Images/OutliningIndicators/InBlock.gif)
203
[Bindable(true),Category("Appearance"),Description("按钮字体大小")]
204
public FontUnit ButtonSize
205![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
206
get
207![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
208
return _size;
209
}
210![](/Images/OutliningIndicators/InBlock.gif)
211
set
212![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
213
base.ChildControlsCreated = false;
214
_size = value;
215
}
216
}
217
#endregion
218![](/Images/OutliningIndicators/InBlock.gif)
219
#endregion
220
221![](/Images/OutliningIndicators/ContractedSubBlock.gif)
重载ChildControlsCreated方法#region 重载ChildControlsCreated方法
222
//构建组成界面的子控件的层次结构,以便为回发或呈现做准备
223
//当开发复合服务器控件或模板服务器控件时,必须重写此方法
224
protected override void CreateChildControls()
225![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
226![](/Images/OutliningIndicators/ContractedSubBlock.gif)
创建表格#region 创建表格
227
Table tb = new Table();
228
TableCell tc;
229![](/Images/OutliningIndicators/InBlock.gif)
230
tb.CellPadding = 0;
231
tb.CellSpacing = 0;
232![](/Images/OutliningIndicators/InBlock.gif)
233
tb.Rows.Add(new TableRow());
234
tb.Rows.Add(new TableRow());
235
tb.Rows[0].Cells.Add(new TableCell());
236
tb.Rows[0].Cells.Add(new TableCell());
237
tb.Rows[1].Cells.Add(new TableCell());
238![](/Images/OutliningIndicators/InBlock.gif)
239
base.Controls.Clear();//清除基类中的控件
240
base.Controls.Add(tb);//添加新创建的表格
241
#endregion
242![](/Images/OutliningIndicators/InBlock.gif)
243![](/Images/OutliningIndicators/ContractedSubBlock.gif)
创建文本框#region 创建文本框
244
TextBox txt = new TextBox();
245
txt.ID = "txtValue";
246
//通过Attributes集合把客户端JS事件处理程序添加到服务器控件
247
txt.Attributes.Add("OnKeyPress","return KeyPressed(event,this)");
248
txt.Attributes.Add("OnKeyUp", "return KeyUp(this)");
249
txt.Attributes.Add("OnChange", "return SpinnerChanged(this)");
250
txt.Attributes.Add("OnPaste", "return SpinnerChanged(this)");
251
//应用样式
252
txt.ApplyStyle(this.ControlStyle);
253
//移除文本框的Border(用表格单元格Border代替)
254
txt.Style.Add("Border-Top", "none");
255
txt.Style.Add("Border-Right", "none");
256
txt.Style.Add("Border-Left", "none");
257
txt.Style.Add("Border-Bottom","none");
258
txt.Width = new Unit("100%"); //文本框的宽度
259
txt.Text = this.Value.ToString(); //文本框的值
260
261![](/Images/OutliningIndicators/InBlock.gif)
262
//设置文本框所在的单元格的样式
263
if (this.ButtonAlign == SpinnerAlign.Left)
264
tc = tb.Rows[0].Cells[1];
265
else
266
tc = tb.Rows[0].Cells[0];
267![](/Images/OutliningIndicators/InBlock.gif)
268
tc.Style.Add("vertical-align","middle");
269![](/Images/OutliningIndicators/InBlock.gif)
270
tc.ApplyStyle(this.ControlStyle);
271![](/Images/OutliningIndicators/InBlock.gif)
272
tc.Style.Add("Border-Top", "2px inset");
273
tc.Style.Add("Border-Right", "silver 1px solid");
274
tc.Style.Add("Border-Left", "2px inset");
275
tc.Style.Add("Border-Bottom","silver 1px solid");
276
tc.Controls.Add(txt);
277
tc.RowSpan = 2;//使文本框跨越Up/Down按钮两行
278
tc.Width = new Unit("100%");
279
#endregion
280![](/Images/OutliningIndicators/InBlock.gif)
281![](/Images/OutliningIndicators/ContractedSubBlock.gif)
Up按钮#region Up按钮
282
//判断客户端浏览器是不是IE
283
bool isIE = true;
284
try
285![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
286
isIE = Context.Request.Browser.VBScript;
287
}
288
catch
289![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
290
//null
291
}
292![](/Images/OutliningIndicators/InBlock.gif)
293
//Up按钮的单元格
294
if (this.ButtonAlign == SpinnerAlign.Left)
295
tc = tb.Rows[0].Cells[0];
296
else
297
tc = tb.Rows[0].Cells[1];
298![](/Images/OutliningIndicators/InBlock.gif)
299
//Up按钮
300
tc.BackColor = System.Drawing.Color.Gainsboro;
301
tc.BorderStyle = (isIE==true ? BorderStyle.Outset : BorderStyle.Solid);
302
tc.BorderWidth = new Unit("1px");
303
tc.Style.Add("cursor", "pointer");
304
tc.Font.Size = _size;
305![](/Images/OutliningIndicators/InBlock.gif)
306
tc.Attributes.Add("OnMouseUp", "this.style.backgroundColor='Gainsboro';" + (isIE==true ? "this.style.borderStyle='outset';" : ""));
307
tc.Attributes.Add("OnMouseDown", "this.style.backgroundColor='WhiteSmoke';" + (isIE==true ? "this.style.borderStyle='inset';" : ""));
308
tc.Attributes.Add("OnMouseOut", "this.style.backgroundColor='Gainsboro';" + (isIE==true ? "this.style.borderStyle='outset';" : ""));
309
tc.Attributes.Add("OnClick", "Increment('" + txt.ClientID + "');");
310
tc.Text = "▲";//字符"▲".
311
#endregion
312![](/Images/OutliningIndicators/InBlock.gif)
313![](/Images/OutliningIndicators/ContractedSubBlock.gif)
Down按钮#region Down按钮
314
tc = tb.Rows[1].Cells[0];
315
tc.BackColor = System.Drawing.Color.Gainsboro;
316
tc.BorderStyle = (isIE==true ? BorderStyle.Outset : BorderStyle.Solid);
317
tc.BorderWidth = new Unit("1px");
318
tc.Style.Add("cursor", "pointer");
319
tc.Font.Size = _size;
320![](/Images/OutliningIndicators/InBlock.gif)
321
tc.Attributes.Add("OnMouseUp", "this.style.backgroundColor='Gainsboro';" + (isIE==true ? "this.style.borderStyle='outset';" : ""));
322
tc.Attributes.Add("OnMouseDown", "this.style.backgroundColor='WhiteSmoke';" + (isIE==true ? "this.style.borderStyle='inset';" : ""));
323
tc.Attributes.Add("OnMouseOut", "this.style.backgroundColor='Gainsboro';" + (isIE==true ? "this.style.borderStyle='outset';" : ""));
324
tc.Attributes.Add("OnClick", "Decrement('" + txt.ClientID + "');");
325![](/Images/OutliningIndicators/InBlock.gif)
326
tc.Text = "▼";//字符"▼"
327
#endregion
328![](/Images/OutliningIndicators/InBlock.gif)
329
}
330![](/Images/OutliningIndicators/InBlock.gif)
331
#endregion
332![](/Images/OutliningIndicators/InBlock.gif)
333![](/Images/OutliningIndicators/ContractedSubBlock.gif)
重载AddAttributesToRender#region 重载AddAttributesToRender
334
//将需要呈现的 HTML 属性和样式添加到指定的 HtmlTextWriterTag 中。此方法主要由控件开发人员使用
335
protected override void AddAttributesToRender(HtmlTextWriter writer)
336![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
337
//请注意TextBox控件的宽度被指定为100%,所以如果省略下步控件的宽度会覆盖整个页面
338
writer.AddStyleAttribute(HtmlTextWriterStyle.Width,this.Width.ToString());//默认宽度80px
339
}
340
#endregion
341![](/Images/OutliningIndicators/InBlock.gif)
342![](/Images/OutliningIndicators/ContractedSubBlock.gif)
重载OnPreRender#region 重载OnPreRender
343
//此方法通知服务器控件在保存视图状态和呈现内容之前,执行任何必要的预呈现步骤
344
protected override void OnPreRender(EventArgs e)
345![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
346
EnsureChildControls();//确定服务器控件是否包含子控件。如果不包含,则创建子控件。
347
base.OnPreRender (e);
348
}
349
#endregion
350![](/Images/OutliningIndicators/InBlock.gif)
351![](/Images/OutliningIndicators/ContractedSubBlock.gif)
重载Render#region 重载Render
352
//将服务器控件内容发送到提供的 HtmlTextWriter 对象,此对象编写将在客户端呈现的内容
353
//在开发自定义服务器控件时,可以重写此方法以生成 ASP.NET 页的内容
354
protected override void Render(HtmlTextWriter writer)
355![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
356
EnsureChildControls();//确定服务器控件是否包含子控件。如果不包含,则创建子控件。
357
base.Render(writer);
358
}
359
#endregion
360![](/Images/OutliningIndicators/InBlock.gif)
361![](/Images/OutliningIndicators/ContractedSubBlock.gif)
重载OnLoad,向客户端发送JS脚本资源#region 重载OnLoad,向客户端发送JS脚本资源
362
protected override void OnLoad(EventArgs e)
363![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
364
EnsureChildControls();//确定服务器控件是否包含子控件。如果不包含,则创建子控件。
365
366
367
//注册脚本库
368
if (!Page.IsClientScriptBlockRegistered(this.GetType().FullName))
369![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
370
Page.RegisterClientScriptBlock(this.GetType().FullName, Scripts);
371
}
372![](/Images/OutliningIndicators/InBlock.gif)
373
Page.RegisterStartupScript(this.ClientID, String.Format( StartupScriptFormat,
374
this.FindControl("txtValue").ClientID,
375
this.Increment,
376
this.Value,
377
this.Maximum,
378
this.Minimum
379
)
380
);
381![](/Images/OutliningIndicators/InBlock.gif)
382
base.OnLoad (e);
383
}
384
#endregion
385![](/Images/OutliningIndicators/InBlock.gif)
386![](/Images/OutliningIndicators/InBlock.gif)
387
}
388
}
389![](/Images/OutliningIndicators/None.gif)
Javascript脚本源码(SpinnerLib.js, 这是原书附带的代码):----
1
<script language="JavaScript">
2
<!--
3
function IsChar(code)
4![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
5
return /\w/.test(String.fromCharCode(code));
6
}
7
function KeyPressed(e, src)
8![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
9
var code;
10![](/Images/OutliningIndicators/InBlock.gif)
11
if (e.which == undefined)
12![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
13
//IE
14
code = e.keyCode;
15
}
16
else
17![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
18
//Mozilla/NS6+
19
code = e.which;
20
}
21![](/Images/OutliningIndicators/InBlock.gif)
22
// It's not a character value, leave the function.
23
if (!IsChar(code)) return true;
24
25
return !isNaN(String.fromCharCode(code));
26
}
27
function KeyUp(src)
28![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
29
// If we have a valid value, we save it for later,
30
// else we restore the previously saved value.
31
if (src.value <= src.max && src.value >= src.min)
32![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
33
src.original = src.value;
34
return true;
35
}
36
else
37![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
38
// Exceptional case: the user is entering a negative number.
39
if (src.value == "-") return true;
40![](/Images/OutliningIndicators/InBlock.gif)
41
src.value = src.original;
42
return false;
43
}
44
}
45
function SpinnerChanged(src)
46![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
47
// If we have a valid value, we save it for later,
48
// else we restore the previously saved value.
49
if (src.value <= src.max && src.value >= src.min)
50![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
51
src.original = src.value;
52
return true;
53
}
54
else
55![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
56
src.value = src.original;
57
return false;
58
}
59
}
60![](/Images/OutliningIndicators/None.gif)
61
function Decrement(target)
62![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
63
src = document.getElementById(target);
64
src.value = parseInt(src.value) - parseInt(src.step);
65
SpinnerChanged(src);
66
src.focus();
67
}
68![](/Images/OutliningIndicators/None.gif)
69
function Increment(target)
70![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
71
src = document.getElementById(target);
72
src.value = parseInt(src.value) + parseInt(src.step);
73
SpinnerChanged(src);
74
src.focus();
75
}
76
//-->
77
</script>
78![](/Images/OutliningIndicators/None.gif)
79![](/Images/OutliningIndicators/None.gif)
完整程序文件下载:----/Files/bluesky521/Spinner_OK200709271300.rar
---- 作者:夏春涛 Email:xchuntao@163.com QQ:23106676