如何通过数据库在组合框中搜索
[英]how to search in combobox by database
问题描述
protected void Page_Load(object sender, EventArgs e)
{
dr = new MySqlDataAdapter("select * from cus_mas_det", conn);
ds = new DataSet();
dr.Fill(ds, "cus_mas_det");
DataTable CodeDesc = new DataTable();
conn.Open();
dr = new MySqlDataAdapter("select tvl_code, concat_ws(',', tvl_code, citi_name) citiname from code_desc where travel_mode = 'BUS'", conn);
ds1 = new DataSet();
dr.Fill(ds1);
ddlfrom.DataSource = ds1;
ddlfrom.DataTextField = "citiname";
ddlfrom.DataValueField = "tvl_code";
ddlfrom.DataBind();
txtbookingdate.Text = System.DateTime.Now.ToString("yyyy/MM/dd");
txtbookingdate.ReadOnly = true;
txtbookingref.Text = autoid();
txtbookingref.ReadOnly = true;
}
I have a asp page in which I have textboxes and comboboxes, I am populating the combobox from the database, as given in the above code, and I am able to populate that. 
我有一个ASP页面，其中有文本框和组合框，我从数据库中填充组合框，如上面的代码所示，并且能够填充该组合框。
Now my problem is I want to search the elemnets by typing any words in the combobox.. 现在我的问题是我想通过在组合框中键入任何单词来搜索elemnet。
For example, if I type word "Ab" it should show all the elements starting with "Ab".. 例如，如果我输入单词“ Ab”，则应显示所有以“ Ab”开头的元素。
How to do that? 怎么做？
<asp:ComboBox ID="ddlfrom" class="chzn-select" runat="server"
DataTextField="name" DataValueField="name" MaxLength="0"
style="display: inline;"
onselectedindexchanged="ddlfrom_SelectedIndexChanged1">
</asp:ComboBox>
3 个解决方案
解决方案1
0 2013-11-12 09:58:34
You need to do this client side using AJAX. 您需要使用AJAX进行此客户端。
Create a web service or use a page method which takes as a parameter some search text and then returns the data you need.
创建一个Web服务或使用一个页面方法，该方法将一些搜索文本作为参数，然后返回所需的数据。 Client side - handle the keypress event using JavaScript/jQuery and update your combo box or whatever control you are using at that point.
客户端-使用JavaScript / jQuery处理keypress事件，并更新您的组合框或此时使用的任何控件。
Example using jQuery: 使用jQuery的示例：
$('#<%= txtBox.ClientID %>').keypress(function () {
var currentText = $(this).val();
$.get('some_web_service', { searchText: currentText }, function (data) {
// update combo box here using data
});
});
This assumes you have a web service called some_web_service which will return the data you need. 假设您有一个名为some_web_service的Web服务，它将返回所需的数据。
Alternatively you could put the whole thing in an UpdatePanel and handle the keypress event but the performance of this will not be as good. 或者，您可以将整个事情放在UpdatePanel中并处理keypress事件，但是这样做的性能将不尽人意。
解决方案2
0 2013-11-12 10:01:32
我不认为您可以使用ASP.Net组合框进行这种搜索，而应该尝试一些类似的操作
解决方案3
0 已采纳 2013-11-12 10:11:19
You can use chosen jquery plugin from here harvesthq.github.io/chosen/ 您可以在此处使用选定的jquery插件Harvesthq.github.io/chosen/
So you can search keyword within drop-down list try this plugin. 因此，您可以在下拉列表中搜索关键字，尝试使用此插件。
This may help you to use How do I use Chosen jQuery in my html file? 这可以帮助您使用如何在HTML文件中使用选择的jQuery？
Add required js and css files to page assign class to dropdown like this:- 将所需的js和css文件添加到页面，将类分配给下拉列表，如下所示：-
<head>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css">
<script src="http://code.jquery.com/jquery-1.8.3.js"></script>
<script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
<script src="http://harvesthq.github.com/chosen/chosen/chosen.jquery.js"></script>
<link rel="stylesheet" href="http://harvesthq.github.com/chosen/chosen/chosen.css">
<script type="text/javascript">
$(function(){
$(".chzn-select").chosen();
});
</script>
</head>
<body>
Assign class to your dropdown 将课程分配给您的下拉菜单
<asp:DropDownList ID="dr_list" runat="server" CssClass="chzn-select">
<asp:ListItem Value="-1" Text=""></asp:ListItem>
</asp:DropDownList>
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.