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Aug 21st, 2007

dropdownlist disable other dropdownlist

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Hi Guys

I'm a newbie in asp.net and I want to disable dropdownlist1 in my form when value "no" is selected from the <asp:ListItem> of dropdownlist2. How can I achieve that? Thanks for reply. BTW I'm using C# language.

Finch

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finch

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Aug 21st, 2007

Re: dropdownlist disable other dropdownlist

A very simple and crude snippet:

JavaScript / DHTML / AJAX Syntax (Toggle Plain Text)
<select name="first" id="first" onchange="if(this.value == 'no') document.getElementById('sec').disabled=true; else document.getElementById('sec').disabled=false;">
    <option value="yes">Yes</option>
    <option value="no">No</option>
</select>
<br /><br />
<select name="sec" id="sec">
    <option value="yes">Yes</option>
    <option value="no">No</option>
</select>
<select name="first" id="first" onchange="if(this.value == 'no') document.getElementById('sec').disabled=true; else document.getElementById('sec').disabled=false;">
    <option value="yes">Yes</option>
    <option value="no">No</option>
</select>
<br /><br />
<select name="sec" id="sec">
    <option value="yes">Yes</option>
    <option value="no">No</option>
</select>

I would leave to you the job of putting those bunch of statements in a separate function and changing the way the function is called as per your requirement.

Last edited by ~s.o.s~; Aug 21st, 2007 at 12:58 pm.

~s.o.s~

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Failure as a human

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Aug 21st, 2007

Re: dropdownlist disable other dropdownlist

Thank for your help mate.

Problem is that solution is perfect for html form, not asp.net - therefore I cannot use it within <br> and <td> tags in asp form. I also cannot use method onchange, web developer says that it is no supported by dropdownlist. Any ideas how to trick it? Thanks a lot for your time.

Finch

Edit: Here's the code I want to change:

<asp:View ID="View4" runat="server">
<table cellpadding="4" cellspacing="4">
<tr>
<td colspan="2"><b>Section 3 - Health and Safety Policy and Arrangements</b></td>
</tr>
<tr>
<td>3.1 Does your company have a written Health and Safety Policy?</td>
<td><asp

ropDownList ID="HealthPolicy" runat="server" >
<asp:ListItem></asp:ListItem>
<asp:ListItem>No</asp:ListItem>
<asp:ListItem>Yes</asp:ListItem>
</asp

ropDownList>
</td>
</tr>
<tr><td>If yes, please provide us with copy of your health and safety policy. Please go to section 3.3. If No, please answer question 3.2</td></tr>
<tr>
<td>3.2 Does your company employ 5 or persons?</td>
<td><asp

ropDownList ID="Employ5" runat="server" Enabled="False" >
<asp:ListItem></asp:ListItem>
<asp:ListItem>No</asp:ListItem>
<asp:ListItem>Yes</asp:ListItem>
</asp

ropDownList>
</td>
</tr>

Last edited by finch; Aug 21st, 2007 at 6:46 pm.

finch

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