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POJavaScript button click to change variable
 

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    <p>Hey people I'm doing a complicated statistics project in which I have several numbers displayed and want to change how many decimals they're calculated to. I want to make it so that the viewer of the page can change this number by clicking an increase or decrease button. But right now the only way I know how to change it is through the code itself, which is the "dec" variable at the beginning. Here I have it set to 2 places, but how could I make it so that it changes value with the buttons? Thanks!</p> <pre><code>&lt;input type="button" onclick="increase()" value="Increase"/&gt; &lt;input type="button" onclick="decrease()" value="Decrease"/&gt; &lt;br/&gt;&lt;table border="1"&gt;&lt;tr&gt; &lt;script type="text/javascript"&gt; dec=2; for(n=1;n&lt;=9;n++) { document.write("&lt;td&gt;"); for(t=0;t&lt;=45;t++) { if(t&lt;n) result=0; else result=fixed(((combin(t,n)*fact(n)*fact(45-n)/fact(45))*100),dec); document.write(result); zero(result,dec); document.write("%&lt;br/&gt;"); } document.write("&lt;/td&gt;"); } function increase() { ??? } function decrease() { ??? } function fact(num) { result=1; for(cnt=num;cnt&gt;0;cnt--) result*=cnt; return result; } function combin(n,r) { result=fact(n)/(fact(r)*fact(n-r)); return result; } function fixed(num,d) { result=Math.round(num*Math.pow(10,d))/Math.pow(10,d); return result; } function zero(num,dec) { if(dec!=0&amp;&amp;num-Math.floor(num)==0) document.write("."); for(cnt=dec;cnt&gt;0;cnt--) { test=num*Math.pow(10,cnt) if(test%10==0) document.write("0"); } } &lt;/script&gt;&lt;/tr&gt;&lt;/table&gt; </code></pre>
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