Question

Need ASP.net/Javascript help

Asked by: davidsperling

In this example, I want the dropdown to be set to "not specified" as soon you start typing free text, and vice versa I want the textbox to become empty when you select something in the dropdown.

Can you show me a good practice how to do this in ASP.net/Javascript

SOURCE PROVIDED IN ZIP!

[Default.aspx]
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <br />
        Select from list:<br />
        <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" DataTextField="name" DataValueField="person_id" AppendDataBoundItems="true">
        <asp:ListItem Value="0">--not specified--</asp:ListItem>
        </asp:DropDownList>&nbsp;<br />
        <br />
        <br />
        Or search by free text:<br />
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
        &nbsp;<br />
        <br />
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" /><br />
        <br />
        <asp:GridView ID="GridView1" runat="server">
        </asp:GridView>
        <br />
        &nbsp;<br />
        <br />
        
        
    
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Bruno.mdf;Integrated Security=True;User Instance=True" ProviderName="System.Data.SqlClient" SelectCommand="SELECT [person_id], [name] FROM [person]"></asp:SqlDataSource>
    
    </div>
        <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Bruno.mdf;Integrated Security=True;User Instance=True"
            ProviderName="System.Data.SqlClient" SelectCommand="SELECT [person_id], [name], [shoe_id] FROM [person] WHERE ([name] LIKE '%' + @name + '%')">
            <SelectParameters>
                <asp:ControlParameter ControlID="TextBox1" Name="name" PropertyName="Text" Type="String" />
            </SelectParameters>
        </asp:SqlDataSource>
        <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Bruno.mdf;Integrated Security=True;User Instance=True"
            SelectCommand="SELECT [person_id], [name], [shoe_id] FROM [person] WHERE ([person_id] = @person_id)">
            <SelectParameters>
                <asp:ControlParameter ControlID="DropDownList1" Name="person_id" PropertyName="SelectedValue"
                    Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>
    </form>
</body>
</html>
 
 
 
[Default.aspx.cs]
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
 
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (TextBox1.Text.Trim().Length>=1)
            GridView1.DataSource = SqlDataSource2; //use textbox
        else
            GridView1.DataSource = SqlDataSource3; //use dropdown
 
        GridView1.DataBind();
    }
}

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JavaScript1-ee.zip
- 127 KB
REMOVE ALL .TXT EXTENSIONS IN ALL FOLDERS
ee.png
- 4 KB
screenshot

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Asked On: 2009-11-02 at 05:45:37ID24863556
Topics: Programming for ASP.NET
,; JavaScript
Participating Experts: 2
Points: 500
Comments: 8

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Answers

by: nfashawPosted on 2009-11-02 at 06:09:44ID: 25719376

Use event handlers on TextBox1 and DropDownList1 to know when to make changes to each other.

<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" /> 
<asp:TextBox ID="TextBox1" runat="server" OnTextChanged="TextBox1_TextChanged" /> 
//and the code
protected void TextBox1_TextChanged(object sender, EventArgs e)
        {
            DropDownList1.SelectedIndex = 0;
        } 
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            TextBox1.Text = string.Empty;
        }

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by: nfashawPosted on 2009-11-02 at 06:15:36ID: 25719434

My apologies. You can make the DropDownList work by setting the AutoPostBack="true", but as far as the TextBox is concerned, even if it's AutoPostBack is set to true, it won't post until the user leaves the control.

by: davidsperlingPosted on 2009-11-02 at 06:23:58ID: 25719502

Hmm, doesn't quite work the way I want.

First, you have to set AutoPostback=true for both controls (don't know if that will slow things down in the real world)

Worse, the dropdown doesn't change immedialtely when to start typing free text. How to work around that? Classic javascript?

by: davidsperlingPosted on 2009-11-02 at 06:24:41ID: 25719510

Sorry, missed your post :-) We though of the same ting I guess..

by: princeatapiPosted on 2009-11-02 at 06:50:19ID: 25719816

Try this code snippet

Java script code  
<script type="text/javascript">
    function OnKeyPressTextBox()
    {
        var txtBox = document.getElementById("TextBoxInp");
        var lstBox = document.getElementById("ListBoxInp");
        if( lstBox.value != "Not Specified")
            lstBox.value = "Not Specified";  
        
    }
    
    function OnSelection()
    {
         
        var txtBox = document.getElementById("TextBoxInp");
        var lstBox = document.getElementById("ListBoxInp").value;
        if( lstBox != "Not Specified")
            if( txtBox.value != "")
                txtBox.value ="";
        return false;
    }
    
    </script> 
Code Behind  
 TextBoxInp.Attributes.Add("onkeypress", "return OnKeyPressTextBox();");
        ListBoxInp.Attributes.Add("onchange", "return OnSelection();"); 
.aspx file  
<asp:DropDownList ID="ListBoxInp" runat="server">
            <asp:ListItem Text="Not Specified" />
            <asp:ListItem Text="Option1" />
            <asp:ListItem Text="Option 2" />
            <asp:ListItem Text="Option 3" />
            <asp:ListItem Text="Option 4" />
        </asp:DropDownList>
    </div>
    <asp:TextBox ID="TextBoxInp" runat="server" >
    </asp:TextBox> 

hope this will help you :)

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by: davidsperlingPosted on 2009-11-02 at 07:34:27ID: 25720281

Thanks! This works too!

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
 
    <script type="text/javascript">
        function clearText(tbxId){
            document.getElementById(tbxId).value="";
        }
                
        function clearDrop(dropId) {
          var Value=0;
          SelectObject = document.getElementById(dropId);
          for(index = 0; 
            index < SelectObject.length; 
            index++) {
           if(SelectObject[index].value == Value)
             SelectObject.selectedIndex = index;
           }
        }        
        
    </script>
 
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <br />
            Select from list:<br />
            <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1"
                DataTextField="name" DataValueField="person_id" AppendDataBoundItems="true" onchange="clearText('TextBox1');">
                <asp:ListItem Value="0">--not specified--</asp:ListItem>
            </asp:DropDownList>&nbsp;<br />
            <br />
            <br />
            Or search by free text:<br />
            <asp:TextBox ID="TextBox1" runat="server" onfocus="clearDrop('DropDownList1');"></asp:TextBox><br />
            &nbsp;<br />
            <br />
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" /><br />
            <br />
            <asp:GridView ID="GridView1" runat="server">
            </asp:GridView>
            <br />
            &nbsp;<br />
            <br />
            <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Bruno.mdf;Integrated Security=True;User Instance=True"
                ProviderName="System.Data.SqlClient" SelectCommand="SELECT [person_id], [name] FROM [person]">
            </asp:SqlDataSource>
            <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Bruno.mdf;Integrated Security=True;User Instance=True"
                ProviderName="System.Data.SqlClient" SelectCommand="SELECT [person_id], [name], [shoe_id] FROM [person] WHERE ([name] LIKE '%' + @name + '%')">
                <SelectParameters>
                    <asp:ControlParameter ControlID="TextBox1" Name="name" PropertyName="Text" Type="String" />
                </SelectParameters>
            </asp:SqlDataSource>
            <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Bruno.mdf;Integrated Security=True;User Instance=True"
                SelectCommand="SELECT [person_id], [name], [shoe_id] FROM [person] WHERE ([person_id] = @person_id)">
                <SelectParameters>
                    <asp:ControlParameter ControlID="DropDownList1" Name="person_id" PropertyName="SelectedValue"
                        Type="Int32" />
                </SelectParameters>
            </asp:SqlDataSource>
        </div>
    </form>
</body>
</html>

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by: davidsperlingPosted on 2009-11-02 at 07:38:13ID: 25720318

Working example:

JavaScript1-ee.zip
- 127 KB
Remove .txt-extensions!

by: davidsperlingPosted on 2009-11-03 at 03:34:36ID: 25727872

When you're working with MasterPages in ASP.net, you have to use a workaround...

That's because the control id's will look like "ctl00_ContentPlaceHolder1_DropDownList1".

Here's a solution to that:

[script.js]
 
function test(tbxName){
    alert('test');
    tbx=getAspNetElementById(tbxName);
    tbx.value='testing testing';
}
 
 
function clearText(tbxId){
    getAspNetElementById(tbxId).value="";
}
        
function clearDrop(dropId) {
  var Value=0;
  SelectObject = getAspNetElementById(dropId);
  for(index = 0; 
    index < SelectObject.length; 
    index++) {
   if(SelectObject[index].value == Value)
     SelectObject.selectedIndex = index;
   }
}        
 
 
 
//If asp.net master pages are used, the element will have an id like "ctl00_ContentPlaceHolder1_DropDownList1".        
//Hence we can't just use document.getElementById or the code will look like crap.
function getAspNetElementById(elementId){
   var elements=[];
   var ptn=".+"+elementId;
   elements=getElementsByRegExpId(ptn,document,'*');
   return elements[0];
}
 
http://snippets.dzone.com/posts/show/6719
function getElementsByRegExpId(p_regexp, p_element, p_tagName) {
	p_element = p_element === undefined ? document : p_element;
	p_tagName = p_tagName === undefined ? '*' : p_tagName;
	var v_return = [];
	var v_inc = 0;
	for(var v_i = 0, v_il = p_element.getElementsByTagName(p_tagName).length; v_i < v_il; v_i++) {
		if(p_element.getElementsByTagName(p_tagName).item(v_i).id && p_element.getElementsByTagName(p_tagName).item(v_i).id.match(p_regexp)) {
			v_return[v_inc] = p_element.getElementsByTagName(p_tagName).item(v_i);
			v_inc++;
		}
	}
	return v_return;
}

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JavaScript2-ee.zip
- 128 KB
REMOVE ALL .TXT EXTENSIONS!

20120131-EE-VQP-002

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Programming for ASP.NET

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