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POjquery - do something when not select an option
 

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  1. POjquery - do something when not select an option
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    <p>My question is similar to this : <a href="https://stackoverflow.com/questions/7309730/jquery-select-option-disabled-if-selected-in-multiple-select-boxes">jQuery &lt;select&gt; option disabled if selected in multiple &lt;select&gt; boxes</a></p> <p>and this : <a href="https://stackoverflow.com/questions/4610652/jquery-select-option-disabled-if-selected-in-other-select">jQuery &lt;select&gt; option disabled if selected in other &lt;select&gt;</a></p> <p>but different.</p> <p>I have this html form:</p> <pre><code>&lt;form method="post" action="" name="form_letter"&gt; &lt;label for="letter"&gt;Letter&lt;/label&gt;&lt;br&gt; &lt;select multiple="multiple" name="letter[]" id="letter"&gt; &lt;option value="A"&gt;A&lt;/option&gt; &lt;option value="B"&gt;B&lt;/option&gt; &lt;option value="C"&gt;C&lt;/option&gt; &lt;/select&gt; &lt;label for="list_of_a"&gt;List of A&lt;/label&gt;&lt;br&gt; &lt;select multiple="multiple" name="list_of_a[]" id="list_of_a"&gt; &lt;option value="A1"&gt;A1&lt;/option&gt; &lt;option value="A2"&gt;A2&lt;/option&gt; &lt;option value="A3"&gt;A3&lt;/option&gt; &lt;option value="A4"&gt;A4&lt;/option&gt; &lt;/select&gt; &lt;label for="list_of_b"&gt;List of B&lt;/label&gt;&lt;br&gt; &lt;select multiple="multiple" name="list_of_b[]" id="list_of_b"&gt; &lt;option value="B1"&gt;B1&lt;/option&gt; &lt;option value="B2"&gt;B2&lt;/option&gt; &lt;option value="B3"&gt;B3&lt;/option&gt; &lt;option value="B4"&gt;B4&lt;/option&gt; &lt;/select&gt; &lt;label for="list_of_c"&gt;List of C&lt;/label&gt;&lt;br&gt; &lt;select multiple="multiple" name="list_of_c[]" id="list_of_c"&gt; &lt;option value="C1"&gt;C1&lt;/option&gt; &lt;option value="C2"&gt;C2&lt;/option&gt; &lt;option value="C3"&gt;C3&lt;/option&gt; &lt;option value="C4"&gt;C4&lt;/option&gt; &lt;/select&gt; &lt;input type="submit" value="Save"&gt; &lt;/form&gt;​ </code></pre> <p>what i want to achieve is when an <code>option</code> of <code>select[name="letter[]"]</code> is not selected and then click the <code>submit</code> button, the <code>select</code> list of corresponding letter is <code>null</code> or <code>empty</code>.</p> <p>the scenarios:<br> 1. If <code>option</code> A of <code>select[name="letter[]"]</code> is not selected, then click the <code>submit</code> button, the <code>select[name="list_of_a[]"]</code> will be <code>empty</code> or <code>null</code> even if one of its options selected.<br><br> 2. The same thing goes for B and C.<br><br> 3. If none of the <code>letter</code>'s options selected, then <code>list_of_a</code>, <code>list_of_b</code>, and <code>list_of_c</code> are empty.<br></p> <p>this is my js :</p> <pre><code>$("form[name='form_letter']").on("submit", function(e) { if ($("select[name='letter[]']").find("option:not(:selected)").val() == "A") { $("select[name='list_of_a[]']").val(""); }; if ($("select[name='letter[]']").find("option:not(:selected)").val() == "B") { $("select[name='list_of_b[]']").val(""); }; if ($("select[name='letter[]']").find("option:not(:selected)").val() == "C") { $("select[name='list_of_c[]']").val(""); }; alert("A = " + $("select[name='list_of_a[]']").val() + " and B = " + $("select[name='list_of_b[]']").val() + " and C = " + $("select[name='list_of_c[]']").val()); e.preventDefault(); return false; });​ </code></pre> <p>I have been working on it here <a href="http://jsfiddle.net/VPhPv/21/" rel="nofollow noreferrer">http://jsfiddle.net/VPhPv/21/</a> <br> but got stuck. help me please.</p>
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    1. COWhy aren't you finding the elements by `id`?
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    2. COIs this close to what you're looking for? http://jsfiddle.net/VPhPv/26/
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    3. COyes @Jack, I should do that. its not working properly if I select more than 1 options for `#letter`, but thanks.
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