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String.prototype.expandExponential = function() {return this.replace(/^([+-])?(\d+).?(\d*)[eE]([-+]?\d+)$/,function(x, s, n, f, c){var l = +c < 0, i = n.length + +c, x = (l ? n : f).length,c = ((c = Math.abs(c)) >= x ? c - x + l : 0),z = (new Array(c + 1)).join("0"), r = n + f;return  (l ? r = z + r : r += z).substr(0, i += l ? z.length : 0) + (i < r.length ? "." + r.substr(i) : "");});};
function formatDecimals(num,digits){if(digits<=0){return Math.round(num);}var tenToPower=Math.pow(10,digits);var cropped=String(Math.round(num*tenToPower)/tenToPower);cropped=String(cropped).expandExponential();if(cropped.indexOf(".")==-1){cropped+=".0";}var halves=cropped.split(".");var zerosNeeded=digits-halves[1].length;for(var i=1;i<=zerosNeeded;i++){cropped+="0";}return(cropped);}
function toScientific(num,sigDigs){num=Number(num);if(isNaN(num))return num;var exponent=Math.floor(Math.log(Math.abs(num))/Math.LN10);if(num==0)exponent=0;var tenToPower=Math.pow(10,exponent);var mantissa=num/tenToPower;mantissa=formatDecimals(mantissa,sigDigs-1);var output=mantissa;if(exponent!=0){output+="e"+exponent;}return(output);}
function myCal(){var nn,fv,tv,ft,tt;var result,result1;var output,output1;var nDicimal,nScientific;var validated;var ifzero="";var indx1,indx2;validated=numberValidation();linkUnitDetails();if(validated==true){nn=document.getElementById("Text1").value;fv=document.getElementById("Select1").value;tv=document.getElementById("Select2").value;indx1=document.getElementById("Select1").selectedIndex;indx2=document.getElementById("Select2").selectedIndex;ft=document.getElementById("Select1").options[indx1].text;tt=document.getElementById("Select2").options[indx2].text;result=(eval(fv)/eval(tv))*nn;if(document.getElementById("Radio1").checked){nDicimal=parseInt(document.getElementById("SelectP").options[document.getElementById("SelectP").selectedIndex].text);result1=formatDecimals(result,nDicimal);}else{nScientific=parseInt(document.getElementById("SelectP").options[document.getElementById("SelectP").selectedIndex].text);result1=toScientific(result,nScientific+1);}output1=nn+" "+ft+" = "+result1+" "+tt;if(parseFloat(result1)==0){ifzero="0?, change to scientific format or raise the precision level";document.getElementById("txtAlart").innerHTML=ifzero;}else{document.getElementById("txtAlart").innerHTML="";}document.getElementById("rel").innerHTML=output1;}}
function linkUnitDetails(){var ft,tt,urlf,urlt;ft=document.getElementById("Select1").options[document.getElementById("Select1").selectedIndex].text;tt=document.getElementById("Select2").options[document.getElementById("Select2").selectedIndex].text;urlf="../unitsDict/luminous_fluxs.htm#"+ft;urlt="../unitsDict/luminous_fluxs.htm#"+tt;if(ft==tt){if(IsTextInTheList(ft)){document.getElementById("linkfrom").innerHTML="more about "+ft.link(urlf);document.getElementById("linkto").innerHTML="";}else{document.getElementById("linkfrom").innerHTML="";document.getElementById("linkto").innerHTML="";}}else{if(IsTextInTheList(ft)&&IsTextInTheList(tt)){document.getElementById("linkfrom").innerHTML="more about "+ft.link(urlf)+" and ";}if(IsTextInTheList(ft)&&!IsTextInTheList(tt)){document.getElementById("linkfrom").innerHTML="more about "+ft.link(urlf);}if(IsTextInTheList(tt)){document.getElementById("linkto").innerHTML=tt.link(urlt);}else{document.getElementById("linkto").innerHTML="";}if(!IsTextInTheList(ft)&&IsTextInTheList(tt)){document.getElementById("linkfrom").innerHTML="";document.getElementById("linkto").innerHTML="more about "+tt.link(urlt);}if(!IsTextInTheList(ft)&&!IsTextInTheList(tt)){document.getElementById("linkfrom").innerHTML="";document.getElementById("linkto").innerHTML="";}}}
function IsTextInTheList(txt){var lst;lst="lumen, candela·steradian, mean spherical candlepower";if(lst.indexOf(txt)>-1){return(true);}else{return(false);}}
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