如何在不刷新页面的情况下自动检查文本框中的现有数据。 [英] How to auto check existing data in textbox without refreshing the page.
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问题描述
我想检查文本框上的数据(UserID)而不刷新页面。实际上我想要当用户在文本框中写入任何UserID然后从db&结果在同一行而不刷新页面(即UserID可用或UserID不可用)。我正在使用ajax,但仍然页面令人耳目一新。查看我的代码:
Hi, I want to check data (UserID) on textbox without refreshing the page. Actually I want when user write any UserID in textbox then it check from the db & result on same line without refreshing the page (i.e. UserID available or UserID not available). I am using ajax for this but still page is refreshing. See my Code:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TextBox ID="UserID" runat="server" CssClass="w254" AutoPostBack="True" OnTextChanged="UserID_TextChanged"></asp:TextBox>
<asp:Label ID="lbl_error" runat="server" Text="Label" Visible="False" Font-Size="Small"></asp:Label>
<br />
<br />
</ContentTemplate>
</asp:UpdatePanel>
<asp:TextBox ID="FirstName" runat="server"></asp:TextBox>
代码:
Code :
protected void UserID_TextChanged(object sender, EventArgs e)
{
lbl_error.Visible = true;
int chk = 0;
string chk_existing_email = "select userID from tbl_Registration where userID ='" + UserID.Text + "' ";
chk = new CommonClass().Is_exist(chk_existing_email);
if (chk == 1)
{
UserID.Focus();
lbl_error.Text = "UserID is available!";
lbl_error.ForeColor = System.Drawing.Color.Green;
}
else
{
UserID.Focus();
lbl_error.Text = "UserID is not available!";
lbl_error.ForeColor = System.Drawing.Color.Red;
}
}
推荐答案
这是因为你的文本框上有AutoPostback = True,所以它会回发。使用JavaScript事件,OnChange或Onblur并使用jquery的.ajax()方法。
It is because you have AutoPostback = True on your textbox, so it is going to postback. Use the JavaScript event, OnChange or Onblur and use jquery''s .ajax() method instead.
您可以使用Jquery来调用Web服务: -
You can use Jquery to call Web Service:-
( #txtSearch)。selfocomplete({
source: function (request,response){
("#txtSearch" ).autocomplete({ source: function(request, response) {
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