how to work on Jquery on ASP:Dropdown?

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Hello Experts,

Below is my Drop down. On selected index changed I have one more drop down that gets bound.

XML

<asp:DropDownList ID="ddlManufacturer" AutoPostBack="true" Width="100%"
                 runat="server" DataTextField="I001001" DataValueField="I001001"
                 OnSelectedIndexChanged="ddlManufacturer_SelectedIndex" Height="16px" >
             </asp:DropDownList>

During this time, I want to call a JavaScript pleasewait() Till Second drop down binds.

I tried doing Google and I did my try as well and It worked weird. It shows pleasewait() but not till the second drop down binds. It shows and vanishes and then second drop down fills. But I want to show till the second dropdown is bind
Can anyone help me with this please?

Posted 17-Mar-15 10:03am

sudevsu

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Comments

F-ES Sitecore 17-Mar-15 16:19pm

The page is doing a refresh when you change the drop down so any message etc you show is instantly destroyed and the browser waits for the new page to download and render. To do this with any great effect you'd need to wrap the relevant controls in an UpdatePanel so that the page doesn't refresh, but the controls are re-populated via ajax instead. That will give you a chance of showing a "please wait" message that remains until the update is done.

sudevsu 17-Mar-15 16:55pm

My drop downs are in update panel already

2 solutions

Solution 2

Why should not use the Cascading Drop down Box ?

if you use the Cascading Is Fast as your Requirement

refer below link for Cascading Drop down box

http://tusharsangani.blogspot.in/[^]

Posted 17-Mar-15 19:35pm

Tushar sangani

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F-ES Sitecore · Accepted Answer · 2015-03-17T11:33:00

XML

<script type="text/javascript">
    // note order is important, this has to go at the top
    function showMessage() {
        $("#pleaseWait").show();
    }

    function hideMessage() {
        $("#pleaseWait").hide();
    }
</script>

<form id="form1" runat="server">

<div id="pleaseWait">Please wait...</div>

<asp:ScriptManager runat="server" />

<asp:UpdatePanel runat="server">
<ContentTemplate>
    <asp:DropDownList ID="ddlParent" runat="server" AutoPostBack="true" onchange="showMessage()"
        OnSelectedIndexChanged="ddlParent_SelectedIndexChanged">
        <asp:ListItem runat="server">Parent A</asp:ListItem>
        <asp:ListItem runat="server">Parent B</asp:ListItem>
        <asp:ListItem runat="server">Parent C</asp:ListItem>
    </asp:DropDownList>

    <asp:DropDownList ID="ddlChild" runat="server">
        <asp:ListItem runat="server">Please select parent first</asp:ListItem>
    </asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>

</form>

code behind

C#

protected void Page_Load(object sender, EventArgs e)
{
    ScriptManager.RegisterStartupScript(this, this.GetType(), "hideMessage", "hideMessage();", true);
}

protected void ddlParent_SelectedIndexChanged(object sender, EventArgs e)
{
    ddlChild.Items.Clear();

    ddlChild.Items.Add(ddlParent.SelectedValue + " 1");
    ddlChild.Items.Add(ddlParent.SelectedValue + " 2");
    ddlChild.Items.Add(ddlParent.SelectedValue + " 3");

    // simulate a delay
    System.Threading.Thread.Sleep(3000);
}