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Using CheckBoxes for multi-item selection

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ComboBox
This is a migrated thread and some comments may be shown as answers.
Minh
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Minh asked on 11 Mar 2010, 11:28 AM

<!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>
    <telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
    <script type="text/javascript">
    // NOTE - these two functions can be moved to the page
 function StopPropagation(e)
 {
        //cancel bubbling
     e.cancelBubble = true;
  if (e.stopPropagation)
        {
   e.stopPropagation();
  }
 }

 //this method removes the ending character from a string
 function removeLastDelimiter(str)
 {
     var len = str.length;
        if (len > 1)
         return str.substr(0, len - 1);   
     return str;
 }
 function testchange()
 {
     $find("<%= CB1.ClientID %>").set_text("MA5303");
 }
</script>
</telerik:RadScriptBlock>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
     <telerik:RadComboBox ID="CB1" runat="server" Skin="Office2007"
                    AllowCustomText="True" OnItemDataBound="CB1_ItemDataBound"
                    HighlightTemplatedItems="True">
                    <HeaderTemplate>
                        <asp:CheckBox runat="server" ID="SelectAll" />
                        <asp:Label runat="server" ID="hdrLabel" AssociatedControlID="SelectAll">Select All</asp:Label>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <div onclick="StopPropagation(event)">
                            <asp:CheckBox runat="server" ID="chk1" />
                            <asp:Label runat="server" ID="label1" AssociatedControlID="chk1"><%# DataBinder.Eval(Container, "Text") %></asp:Label>
                        </div>
                    </ItemTemplate>
                    <CollapseAnimation Duration="200" Type="OutQuint" />
                </telerik:RadComboBox>
    </div>
    </form>
</body>
</html>


-----------------------------------------------------

private string delimiter = ",";

    public string Delimiter
    {
        get { return delimiter; }
        set { delimiter = value; }
    }
   
    public RadComboBox DDList
    {
        get { return this.CB1; }
    }

    protected override void OnInit(EventArgs e)
    {
        // Create the javascript functions with the client id appended to them.
        StringBuilder sb = new StringBuilder();
        sb.Append(@"<script type='text/javascript'>");
        sb.Append(@"var cancelDropDownClosing");
        sb.Append(CB1.ClientID);
        sb.Append(@"=false; function onDropDownClosing");
        sb.Append(CB1.ClientID);
        sb.Append(@"(){cancelDropDownClosing");
        sb.Append(CB1.ClientID);
        sb.Append(@"= false;}");
        sb.Append(@"function onCheckBoxClick");
        sb.Append(CB1.ClientID);
        sb.Append(@"(){var combo=$find('");
        sb.Append(CB1.ClientID);
        sb.Append(@"');var chkall=$get(combo.get_id() + '_Header_SelectAll');if(AllSelected");
        sb.Append(CB1.ClientID);
        sb.Append(@"()==true){chkall.checked=true;}else{chkall.checked=false;}var text='';var values='';var items=combo.get_items();");
        sb.Append(@"for(var i=0;i<items.get_count();i++){var item=items.getItem(i);var chk1=$get(combo.get_id()+'_i'+i+'_chk1');");
        sb.Append(@"if(chk1.checked){text+=item.get_text()+'");
        sb.Append(Delimiter);
        sb.Append("';values+=item.get_value()+'");
        sb.Append(Delimiter);
        sb.Append("';}}text=removeLastDelimiter(text);values=removeLastDelimiter(values);if(text.length>0){combo.set_text(text);}else{combo.set_text('');}}");
        sb.Append(@"function AnyOneSelected");
        sb.Append(CB1.ClientID);
        sb.Append(@"(){var combo=$find('");
        sb.Append(CB1.ClientID);
        sb.Append(@"');var items=combo.get_items();for(var i=0;i<items.get_count();i++){var item=items.getItem(i);");
        sb.Append(@"var chk1=$get(combo.get_id()+'_i'+i+'_chk1');if(chk1.checked){return true;}}return false;}");
        sb.Append(@"function AllSelected");
        sb.Append(CB1.ClientID);
        sb.Append(@"(){var combo=$find('");
        sb.Append(CB1.ClientID);
        sb.Append(@"');var items=combo.get_items();for(var i=0;i<items.get_count();i++){var item=items.getItem(i);");
        sb.Append(@"var chk1=$get(combo.get_id()+'_i'+i+'_chk1');if(chk1.checked==false){return false;}}return true;}");
        sb.Append(@"function SelectAllClick");
        sb.Append(CB1.ClientID);
        sb.Append(@"(chk){var selectAll=true; if(AnyOneSelected");
        sb.Append(CB1.ClientID);
        sb.Append(@"()==true)selectAll=true;if(AllSelected");
        sb.Append(CB1.ClientID);
        sb.Append(@"()==true)selectAll=false;var text='';var values='';var combo = $find('");
        sb.Append(CB1.ClientID);
        sb.Append(@"');var items=combo.get_items();for(var i=0;i<items.get_count();i++){var item=items.getItem(i);");
        sb.Append(@"var chk1=$get(combo.get_id()+'_i'+i+'_chk1');if(selectAll)chk1.checked=true;else chk1.checked=false;");
        sb.Append(@"if(chk1.checked){text += item.get_text()+'");
        sb.Append(Delimiter);
        sb.Append("';values+=item.get_value()+'");
        sb.Append(Delimiter);
        sb.Append("';}}text=removeLastDelimiter(text);values=removeLastDelimiter(values);if(text.length>0)combo.set_text(text);else ");
        sb.Append(@"combo.set_text('');}</script>");
        string js = sb.ToString();
        // Gets the executing web page
        Page page = HttpContext.Current.CurrentHandler as Page;

        // Register the javascript on the page with the client id appended.
        page.ClientScript.RegisterClientScriptBlock(typeof(_Default), "DDC_" + CB1.ClientID, js);
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        // Create the javascript functions.
        if (!this.IsPostBack)
        {
            // Add the events
            this.CB1.OnClientDropDownClosed = "onDropDownClosing" + CB1.ClientID;
            (CB1.Header.FindControl("SelectAll") as CheckBox).Attributes["onclick"] = "SelectAllClick" + CB1.ClientID + "(this)";
            string[] itemsThietBi = { "MA5300", "MA5303", "SAM960", "M41", "IES5K", "IES1K", "T64G", "T160G", "S6506R", "MA5103", "MA5605" };
            CB1.DataSource = itemsThietBi;
            CB1.DataBind();
        }
    }

    protected void CB1_ItemDataBound(object sender, RadComboBoxItemEventArgs e)
    {
        (e.Item.FindControl("chk1") as CheckBox).Attributes["onclick"] = "onCheckBoxClick" + CB1.ClientID + "(this)";
    }

    public string GetCheckBoxValues()
    {
        StringBuilder sbValues = new StringBuilder();
        foreach (Telerik.Web.UI.RadComboBoxItem rcbItem in DDList.Items)
        {
            //If the box is checked return a value
            CheckBox cb = (CheckBox)rcbItem.FindControl("chk1");
            if (null != cb && cb.Checked)
            {
                sbValues.Append(rcbItem.Text);
                sbValues.Append(Delimiter);
            }
        }
        //Remove Trailing comma
        string str = sbValues.ToString();
        if (str.EndsWith(Delimiter))
            return str.Remove(sbValues.Length - 1, 1);
        return str;
    }

    public void SetCheckBoxValues(string csv)
    {
        // First clear all checks.
        foreach (RadComboBoxItem item in DDList.Items)
        {
            CheckBox chkbox = (CheckBox)item.FindControl("chk1");
            if (null != chkbox)
                chkbox.Checked = false;
        }

        // Find each item in the list and set the check and combo text value.
        string[] values = csv.Split(',');
        string text = string.Empty;
        for (int i = 0; i <= values.Length - 1; i++)
        {
            RadComboBoxItem item = DDList.FindItemByValue(values[i]);
            CheckBox chkbox = (CheckBox)item.FindControl("chk1");
            if (text.Equals(string.Empty))
                text = string.Format("{0}", item.Text);
            else
                text = string.Format("{0}{1} {2}", text, Delimiter, item.Text);
            chkbox.Checked = true;
        }
        DDList.Text = text;     // This doesn't do anything!
    }

How to use javascript to set select items?

Thanks,

4 Answers, 1 is accepted

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Simon
Telerik team
answered on 11 Mar 2010, 03:21 PM
Hi hoc tro,

You can use the client-side select method of a RadComboBoxItem object to select it, e.g.
var item = comboBox.get_items().getItem(1);
item.select();

Regards,
Simon
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Minh
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answered on 11 Mar 2010, 05:29 PM
Hi Simon,
RadCombobox used checkbox select items, i use code javascript:
var item = comboBox.get_items().getItem(1);
item.select();

But not get select item, multi-item. Can you help me?
Brgs,
0
Simon
Telerik team
answered on 11 Mar 2010, 06:49 PM
Hello hoc tro,

As I am not completely sure what your requirement is, can you please provide more details about it?

All the best,
Simon
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Megan Vee
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answered on 27 May 2010, 04:35 PM
Using the code above (i can't find the original post with the zipped project, but i have it on my local machine), how can I add the RadComboBox AND ItemTemplate Checkbox to the page in c# (in the code behind) instead of using html/.net?  Please help!

Thank you,
Megan
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Minh
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Simon
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Minh
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