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POCheck boxes validation in JavaScript
 

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    <p>I have written this script:</p> <pre><code>function getDays(select){ var selectedString = select.options[select.selectedIndex].value; if(selectedString == 4) { document.getElementById("days_target").style.display = "block"; }else { document.getElementById("days_target").style.display = "none"; } } </code></pre> <p>and in <code>validateForm()</code> function I have this:</p> <pre><code>var x=document.forms["form1"]["days"].value; if (x==null || x=="" || x=="Select Days") { alert("Oh, you forgot to select days! :)"); return false; } var x=document.forms["form1"]["days"].value; if(x=="4") { var cnt = 0; for (var i = 7; i &lt; document.day.elements.length; i++) { if (document.day.elements[i].type == 'checkbox') { if (document.day.elements[i].checked == true) { cnt++; } } } if (cnt == 0) { alert("Atleast 1 day Should be Selected."); return false; } } </code></pre> <p>HTML like this:</p> <pre><code>&lt;b&gt;Please enter days required&lt;/b&gt;&lt;br/&gt; &lt;select name="days" id="days" style="width:200px;" onchange="getDays(this)"&gt; &lt;option value="Select Days" selected&gt;Select Days&lt;/option&gt; &lt;option value="1"&gt;Mon-Fri&lt;/option&gt; &lt;option value="2"&gt;Mon-Fri&lt;/option&gt; &lt;option value="3"&gt;Mon-Fri&lt;/option&gt; &lt;option value="4"&gt;Bespoke Days&lt;/option&gt; &lt;/select&gt;&lt;br/&gt;&lt;br/&gt; &lt;div id="days_target" style="display:none;"&gt; &lt;b&gt;Select Days&lt;/b&gt;&lt;br/&gt; &lt;input type="checkbox" name="day" value="mon"/&gt;Mon &amp;nbsp;&amp;nbsp;&lt;input type="checkbox" name="day" value="tue"/&gt;Tue&lt;br/&gt; &lt;input type="checkbox" name="day" value="wed"/&gt;Wed &amp;nbsp;&amp;nbsp;&lt;input type="checkbox" name="day" value="thr"/&gt;Thr&lt;br/&gt; &lt;input type="checkbox" name="day" value="fri"/&gt;Fri &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;input type="checkbox" name="day" value="sat"/&gt;Sat&lt;br/&gt; &lt;input type="checkbox" name="day" value="sun"/&gt;Sun&lt;br/&gt;&lt;br/&gt; &lt;/div&gt; </code></pre> <p>If I select Bespoke days then that check boxes appear and if none is checked then I want to display error message "Atleast one day should be selected." How to do this?</p>
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