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POhow to Resize child list box height in asp.net User control
 

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    <p>Given the following User control markup: </p> <pre><code>&lt;%@ Control Language="C#" AutoEventWireup="true" CodeFile="SearchItem.ascx.cs" Inherits="MyWeb.controls.SearchItem" %&gt; &lt;div id="container" runat="server" style="height: 100%; width: 100%;"&gt; &lt;div&gt; &lt;asp:Label ID="lblSearch" runat="server" Text="Search:"&gt;&lt;/asp:Label&gt; &lt;br /&gt; &lt;asp:TextBox ID="txtSearch" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;input id="btnSearch" type="button" value="Search" onclick="SearchClick(this)" /&gt; &lt;/div&gt; &lt;div&gt; &lt;asp:Label ID="lblItems" runat="server" Text="Available Items:"&gt;&lt;/asp:Label&gt; &lt;/div&gt; &lt;div id="itemContents" runat="server" style="min-height: 50%; width: 100%;border: 1px solid black;"&gt; &lt;asp:ListBox ID="lbxResults" runat="server" SelectionMode="Single" Width="100%" AutoPostBack="True"&gt;&lt;/asp:ListBox&gt; &lt;/div&gt; </code></pre> <p></p> <p>I would like the user control height to be equal to placeholder height with list box to grow and fill up any height difference as all other controls are of known size. Some useful info:</p> <ul> <li><p>Height can have the following values: 300, 400, 600 px, thus the need for the listbox height to compensate for any height difference. </p></li> <li><p>List box can contain 0 to 2000 elements.</p></li> <li><p>Placeholder can be a div or an asp.net tab container.</p></li> </ul> <p>For testing purposes, I did:</p> <ol> <li><p>Create a new user control, eg. SearchItem.ascx </p></li> <li><p>Create a default aspx page for example:</p></li> </ol> <p>a) Add the user control //&lt;%@ Register TagPrefix="uc" TagName="SearchItem" Src="~/Controls/SearchItem.ascx" %></p> <p>b) Add to body</p> <pre><code> &lt;form id="form1" runat="server"&gt; &lt;div id="ChangeMyHeight" style="height: 300px; width: 30%; float: left;"&gt; &lt;uc:SearchItem ID="AvailableItems" runat="server"&gt; &lt;/uc:SearchItem&gt; &lt;/div&gt; &lt;/form&gt; </code></pre> <p>Now if you change the height of the container div to 500, 600.(ChangeMyHeight), you will have:</p> <p>Current behaviour:</p> <ul> <li>Listbox is not resizing properly. (filling the height difference)</li> </ul> <p>Expected behaviour:</p> <ul> <li>Listbox is resizing properly and filling the height difference. (like docking in Winforms) </li> </ul> <p>My preference would be a css/jquery solution but code behind will do as well (I was thinking of using a height property to set up the child controls)</p> <p>Notes:</p> <ol> <li>The sample markup uses style for brevity's sake.</li> <li>The sample markup has hard coded some values for demo purposes(thus the demo is working for height 300 px but not for the other values), feel free to change style/html as needed.</li> <li>Environment: VS2010/.NET 4.0/jQuery latest.</li> <li>Browsers: FF, IE7/8/9</li> </ol>
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    1. COWhat does not work as expected in your example ?
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    2. COCan you post the markup of the placeholder too? Because the surrounding markup is important to what you want to achieve. You can also create a fiddle based on the generated output of your code and extend your explanations on that fiddle.
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    3. CO@LeGEC:Because the listbox does not resize properly when I change the UC height from 300 to 400, etc., it is either smaller (e.g. has 5 items) or bigger (e.g. 1000 items)
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