本文實(shí)例為大家分享了Asp.net單選、復(fù)選框控件的具體實(shí)現(xiàn)代碼,供大家參考,具體內(nèi)容如下
將常用的jquery插件封裝成控件也是個(gè)不錯(cuò)的選擇。
先看看效果:
1.新建類庫(kù)項(xiàng)目,創(chuàng)建數(shù)據(jù)源類
[Serializable]
public class Select2Item
{
public bool Selected { get; set; }
public string Text { get; set; }
public string Value { get; set; }
public Select2Item() { }
public Select2Item(string text, string value)
{
this.Text = text;
this.Value = value;
}
public Select2Item(string text, string value, bool selected)
{
this.Text = text;
this.Value = value;
this.Selected = selected;
}
}
2.創(chuàng)建控件類CheckList,繼承與WebControl,并定義 public List<Select2Item> Items數(shù)據(jù)項(xiàng)屬性。
3.引入腳本文件及樣式文件
a.創(chuàng)建腳本或樣式文件,設(shè)置文件的屬性-生成操作-嵌入的資源
b.需要在namespace上添加標(biāo)記 [assembly: WebResource("命名空間.文件夾名.文件名", "mime類型")]
如:
[assembly: WebResource("Control.Style.checklist.css", "text/css",PerformSubstitution = true)]
[assembly: WebResource("Control.Scripts.checklist.js", "application/x-javascript")]
如果css文件里面存在圖片的話,同樣將圖片設(shè)置為嵌入的資源,在css中的寫法為<%=WebResource("命名空間.文件夾名.文件名")%>
PerformSubstitution 表示嵌入式資源的處理過(guò)程中是否分析其他Web 資源 URL,并用到該資源的完整路徑替換。
c.重寫protected override void OnPreRender(EventArgs e),引入嵌入的腳本或樣式文件
if(Page!=null) Page.Header.Controls.Add(LiteralControl),將<script><link>標(biāo)簽放到LiteralControl中,然后將LiteralControl添加到Page.Header中,最后在頁(yè)面里你就會(huì)看到引入的<script><link>標(biāo)簽。
protected override void OnPreRender(EventArgs e)
{
if (this.Page != null)
{
StringBuilder sbb = new StringBuilder();
sbb.Append(string.Format(STYLE_TEMPLATE, Page.ClientScript.GetWebResourceUrl(this.GetType(), "HandControl.Style.checklist.css")));
sbb.Append(string.Format(SCRIPT_TEMPLATE, Page.ClientScript.GetWebResourceUrl(this.GetType(), "HandControl.Scripts.checklist.js")));
bool hascss = false;
LiteralControl lcc = new LiteralControl(sbb.ToString());
lcc.ID = "lccheck";
foreach (Control item in Page.Header.Controls)
{
if (item.ID == "lccheck")
hascss = true;
}
if (!hascss)
Page.Header.Controls.Add(lcc);
}
base.OnPreRender(e);
}
4.重寫控件的protected override void Render(HtmlTextWriter writer)方法
這里主要是渲染控件的html,根據(jù)你的控件而定。
protected override void Render(HtmlTextWriter writer)
{
if (Items.Count > 0)
{
writer.Write("<div id='div" + this.ClientID + "' class='c01-tag-div' mul='" + (Multiple == true ? "1" : "0") + "'>");
if (Multiple == false)
writer.Write("<input name='tb" + this.ClientID + "' type='hidden' value='" + Items[0].Value + "' />");
else
writer.Write("<input name='tb" + this.ClientID + "' type='hidden' />");
bool first = true;
foreach (var item in Items)
{
if (Multiple == false)
{
if (item.Selected && first)
{
writer.Write("<a title='" + item.Text + "' class='c01-tag-item c01-tag-select' val='" + item.Value + "' tag='Y'>" + item.Text + "</a>");
first = false;
}
else
{
writer.Write("<a title='" + item.Text + "' class='c01-tag-item' val='" + item.Value + "' tag='N'>" + item.Text + "</a>");
}
}
else
{
if (item.Selected)
writer.Write("<a title='" + item.Text + "' class='c01-tag-item c01-tag-select' val='" + item.Value + "' tag='Y'>" + item.Text + "</a>");
else
writer.Write("<a title='" + item.Text + "' class='c01-tag-item' val='" + item.Value + "' tag='N'>" + item.Text + "</a>");
}
}
writer.Write("</div>");
}
}
5.添加GetSelected方法,返回List<Select2Item>,添加GetSelectValue,返回String(多選以,號(hào)隔開(kāi))
public List<Select2Item> GetSelected()
{
if (Page != null)
{
var values = Page.Request.Form["tb" + this.ClientID].Split(',');
var res = Items.Where(t => values.Contains(t.Value)).ToList();
foreach (var item in Items)
{
if (res.Contains(item))
{
item.Selected = true;
}
else
{
item.Selected = false;
}
}
return res;
}
else
{
return null;
}
}
-------------------------------------------
public string GetSelectValue()
{
if (Page != null)
{
return Page.Request.Form["tb" + this.ClientID];
}
return "";
}
6.保存狀態(tài)
你需要重寫兩個(gè)方法protected override object SaveViewState() 、protected override void LoadViewState(object savedState),旨在將Items數(shù)據(jù)項(xiàng)屬性保存到ViewState
protected override object SaveViewState()
{
var valuestr = Page.Request.Form["tb" + this.ClientID];
if (!string.IsNullOrEmpty(valuestr))
{
var values = valuestr.Split(',');
var temp = Items.Where(t => values.Contains(t.Value)).ToList();
foreach (var item in temp)
{
item.Selected = true;
}
}
return new object[] { base.SaveViewState(), Items };
}
protected override void LoadViewState(object savedState)
{
object[] vState = (object[])savedState;
if (vState[0] != null)
base.LoadViewState(vState[0]);
if (vState[1] != null)
Items = (List<Select2Item>)vState[1];
}
7.單選和復(fù)選的設(shè)置,在js中控制
添加屬性
[Description("獲取和設(shè)置多選"), DefaultValue(true), Browsable(true), Category("雜項(xiàng)")]
public bool Multiple { get; set; }
在OnPreRender代碼中你會(huì)發(fā)現(xiàn)Multiple屬性會(huì)影響div的mul屬性值,從而判斷是否多選(默認(rèn)多選)
8.其它說(shuō)明
private static readonly string STYLE_TEMPLATE = "<link href=\"{0}\" rel=\"stylesheet\" type=\"text/css\" />\r\n";
private static readonly string SCRIPT_TEMPLATE = "<script type=\"text/javascript\" src=\"{0}\"></script>\r\n";
效果圖:
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助
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