【ASP】ASP.NET 动态写入服务器端控件第1／2页-NET-动态写入-服务器端控件

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ASP.NET 动态写入服务器端控件第1／2页

<div>
<div class="item">
Please input a number:
<asp:TextBox runat="server" CssClass="item" ID="txtTextCount"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtTextCount" ValidationGroup="CreateTextBox" Display="Dynamic"
ErrorMessage="Required to input content!"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" ControlToValidate="txtTextCount" ValidationGroup="CreateTextBox" Display="Dynamic"
runat="server" ErrorMessage="Only number is valid!" ValidationExpression="^\d+$"></asp:RegularExpressionValidator>  
<asp:Button runat="server" ID="btnCreate" Text="Create TextBox List" ValidationGroup="CreateTextBox"
onclick="btnCreate_Click" />  
<asp:Button runat="server" ID="btnOK" Text="Get TextBox Content" ValidationGroup="ShowListContent"
onclick="btnOK_Click" />
</div>
<div runat="server" id="divControls" class="item"></div>
<div runat="server" id="divMessage">
</div>
</div>

///<summary>

/// Create textbox list
///</summary>
///<param name="num">textbox list count</param>
private void CreateTextBoxList(int num)
{
HtmlGenericControl div;
HtmlGenericControl span;
TextBox txt;
RegularExpressionValidator rev;

for (int i=0; i < num; i++)
{
//创建div
div=new HtmlGenericControl();
div.TagName="div";
div.ID="divTextBox" + i.ToString();
div.Attributes["class"]="item2";

//创建span
span=new HtmlGenericControl();
span.ID="spanTextBox" + i.ToString();
span.InnerHtml="Url Address" + (i+1).ToString() + ":";

//创建TextBox
txt=new TextBox();
txt.ID="txt" + i.ToString();
txt.CssClass="input";

//创建格式验证控件，并且将其关联到对应的TextBox
rev=new RegularExpressionValidator();
rev.ID="rev" + i.ToString();
rev.ControlToValidate=txt.ID;
rev.Display=ValidatorDisplay.Dynamic;
rev.ValidationGroup="ShowListContent";
rev.ValidationExpression=@"(http(s)?://)?([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?";
rev.ErrorMessage="Invalid url Address!";

//添加控件到容器
div.Controls.Add(span);
div.Controls.Add(txt);
div.Controls.Add(rev);
divControls.Controls.Add(div);
}
}

protected void Page_Load(object sender, EventArgs e)
{
if (this.IsPostBack)
{
int txtCount=int.Parse(txtTextCount.Text);

// 注意：每次PostBack时，都需要重新动态创建TextBox
CreateTextBoxList(txtCount);
}
}

protected void btnCreate_Click(object sender, EventArgs e)
{
txtTextCount.Enabled=false;
btnCreate.Enabled=false;
}

protected void btnOK_Click(object sender, EventArgs e)
{
TextBox txt;
StringBuilder sbResult=new StringBuilder() ;
int txtCount=int.Parse(txtTextCount.Text);

//遍历获取动态创建的TextBox们中的Text值
for (int i=0; i < txtCount; i++)
{
//注意：这里必须通过上层容器来获取动态创建的TextBox，才能获取取ViewState内容
txt=divControls.FindControl("txt" + i.ToString()) as TextBox;

if (txt !=null && txt.Text.Trim().Length > 0)
{
sbResult.AppendFormat("Url Address{0}: {1}.<br />", i+1, txt.Text.Trim());
}
}

divMessage.InnerHtml=sbResult.ToString();
}

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