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POjavascript one input field connect to several functions
 

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  1. POjavascript one input field connect to several functions
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    <p>I'm very new to programming and have some problems. I'would like to create one form (in html and javascript), where I can do some calculations. This is about numbers and years. So at first I need to put input field, where I can type year (like 2013). This input value will be connected to several functions:</p> <ol> <li>calculating difference from current year (if I ask for 2018 it should write 5, or if I ask for 2000 iz shoul write -13 and so on...)</li> <li>check if the year is leap year (true/false or yes/no, ...)</li> <li>calculate the sum of the numbers i ask (2018 = 11, 2013=6, ...)</li> <li>if the number is Prime number (true/false, yes/no, ...)</li> <li>reverse number (2013 = 3102, 2018=8102, ...)</li> <li>show the chinese zodiac sign for year</li> <li>convert year to roman numerals (1=I, 2=II, 10=X, ...)</li> </ol> <p>I did find some function, but i just can't put this together that will work. I would be very helpful if someone can help with this.</p> <p>Examples i find on internet:</p> <pre><code>function isleap() { var yr = document.getElementById("year").value; if ((parseInt(yr) % 4) == 0) { if (parseInt(yr) % 100 == 0) { if (parseInt(yr) % 400 != 0) { alert("Not Leap"); return "false"; } if (parseInt(yr) % 400 == 0) { alert("Leap"); return "true"; } } if (parseInt(yr) % 100 != 0) { alert("Leap"); return "true"; } } if ((parseInt(yr) % 4) != 0) { alert("Not Leap"); return "false"; } } </code></pre> <p>reverse:</p> <pre><code>&lt;script type="text/javascript"&gt; var year, b = 0; year= parseInt(prompt("Enter year: ")); document.write("You've entered: " + year+ "&lt;br /&gt;"); while(year&gt; 0) { b = b * 10 b = b + parseInt(year% 10) year= parseInt(year/ 10) } document.write("Reverse numbers: ", b); &lt;/script&gt; </code></pre> <p>sum numbers:</p> <pre><code>&lt;script&gt; function find() { var sum = 0; var no = parseInt(frm.txt1.value); while (no &gt; 0) { sum = sum + no % 10; no = Math.floor(no / 10); } alert("Sum of digits " + sum); } &lt;/script&gt; &lt;form name="frm"&gt; Enter a Number:&lt;input name="txt1" type="text" /&gt; &lt;input name="b1" onClick="find();" type="button" value="display" /&gt; &lt;/form&gt; </code></pre>
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