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POBest Method of Calculating Number of Days in Month for Date Form Drop-down
 

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  1. POBest Method of Calculating Number of Days in Month for Date Form Drop-down
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    <p>I have coded the following in order to preset the number of days for each selected month of a form drop-down list. This also tests for leap year (from year 2000+ since I do not require any earlier). This code appears to work correctly for me, but is there a more efficient way of doing this in terms of less code?</p> <pre><code>&lt;script&gt; function is_leap() { var year=document.getElementById('f_year').value; var a = 2000; for(a;a&lt;year;a+=4) { } if(a==year) { return true; } else return false; } function out_days(v) { var html = ''; for(var x=1;x&lt;=v;x++) { html += '&lt;option value="' + x + '"&gt;' + x + '&lt;/option&gt;'; } document.getElementById('f_day').innerHTML=html; } function chk_mon() { var e = document.getElementById('f_month').selectedIndex; switch(e) { case 0: case 2: case 4: case 6: case 7: case 9: case 11: { out_days(31); break; } case 1: { if(is_leap()) { out_days(29); } else out_days(28); break; } case 3: case 5: case 8: case 10: { out_days(30); break; } default: { out_days(31); break; } } } &lt;/script&gt; &lt;form action="index.php" method="post" name="form"&gt; Date:&lt;select onchange="chk_mon()" id="f_month" name="from_month"&gt; &lt;option value="1"&gt;January&lt;/option&gt; &lt;option value="2"&gt;February&lt;/option&gt; &lt;option value="3"&gt;March&lt;/option&gt; &lt;option value="4"&gt;April&lt;/option&gt; &lt;option value="5"&gt;May&lt;/option&gt; &lt;option value="6"&gt;June&lt;/option&gt; &lt;option value="7"&gt;July&lt;/option&gt; &lt;option value="8"&gt;August&lt;/option&gt; &lt;option value="9"&gt;September&lt;/option&gt; &lt;option value="10"&gt;October&lt;/option&gt; &lt;option value="11"&gt;November&lt;/option&gt; &lt;option value="12"&gt;December&lt;/option&gt; &lt;/select&gt; &lt;select id="f_day" name="from_day"&gt; &lt;script&gt; chk_mon(); &lt;/script&gt; &lt;/select&gt; &lt;select onchange="chk_mon()" id ="f_year" name="from_year"&gt; &lt;option value="2013"&gt;2013&lt;/option&gt; &lt;option value="2014"&gt;2014&lt;/option&gt; &lt;option value="2015"&gt;2015&lt;/option&gt; &lt;option value="2016"&gt;2016&lt;/option&gt; &lt;option value="2017"&gt;2017&lt;/option&gt; &lt;option value="2018"&gt;2018&lt;/option&gt; &lt;option value="2019"&gt;2019&lt;/option&gt; &lt;option value="2020"&gt;2020&lt;/option&gt; &lt;option value="2021"&gt;2021&lt;/option&gt; &lt;option value="2022"&gt;2022&lt;/option&gt; &lt;option value="2023"&gt;2023&lt;/option&gt; &lt;option value="2024"&gt;2024&lt;/option&gt; &lt;option value="2025"&gt;2025&lt;/option&gt; &lt;option value="2026"&gt;2026&lt;/option&gt; &lt;option value="2027"&gt;2027&lt;/option&gt; &lt;option value="2028"&gt;2028&lt;/option&gt; &lt;option value="2029"&gt;2029&lt;/option&gt; &lt;option value="2030"&gt;2030&lt;/option&gt; &lt;/select&gt; &lt;/form&gt; </code></pre>
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    1. USGeorge
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    1. COpossible duplicate of [Javascript: calculate number of days in month for a given year](http://stackoverflow.com/questions/4881938/javascript-calculate-number-of-days-in-month-for-a-given-year)
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      1. POBest Method of Calculating Number of Days in Month for Date Form Drop-down
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    2. COThere is only one month in any given year which has a variable number of days. You could hardwire every month but february, and set feb to 29 if it is a leap year.
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      1. USkennebec
    3. CO@Kennebec isn't this what I am currently doing? I am doing it with a switch statement, but the other months will always get the same value.
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      1. USGeorge
 

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