Amortization Table

var main_url="http://www.mortgagesum.com/mortgagewidget/"; var body = ""; function chh(){ var yy=document.cont1.firstyear.value; var aa=document.cont1.amt.value; var bb=document.cont1.interest.value; var cc=document.cont1.yrs.value; if(aa == "") { aa="0"; } if(bb == "") { bb="0"; } if(cc == "") { cc="0"; } if(yy == "") { yy="0"; } if(aa == "0") { var show = "
Please insert the values for the Principal field"; document.getElementById("priceid1").innerHTML=show; } if(bb == "0") { var show = "
Please insert the values for the Interst field"; document.getElementById("priceid1").innerHTML=show; } if(cc == "0") { var show = "
Please select the value in Number of years field "; document.getElementById("priceid1").innerHTML=show; } if(yy == "0") { var show = "
Please select the value in First Payment Yr field "; document.getElementById("priceid1").innerHTML=show; } if(aa != "0" && bb != "0" && cc != "0" && yy != "0"){ GenerateValue(aa,bb,cc,yy); } } function generatePage(){ var tmp1, tmp2; tmp1 = document.cont1.amt.value; tmp2 = document.cont1.interest.value; tmp3 = document.cont1.yrs.value; if (confirm("An Amortization Table calculates the periodic payment breakdown for each specific category listed.")) { body = ("Amortization Table"); body = (body + ""); body = (body +""); body = (body +"

Amortization Table

"); body = (body +"The following table is based on the information entered in the calculator form.
"); body = (body +"Mortgage Amount: " +formatCurrency(tmp1)); body = (body +"
Interest Rate: " + tmp2 + " %"); body = (body +"
Mortgage Length: " + tmp3 + " Years "); body = (body +"

"); body = (body +"\n"); createtable(); body = (body +"

Year

Interest

Principal

Balance

Amortization Calculator"); msgWindow=window.open("","displayWindow","toolbar=no,class=text_content,width=500,height=400,directories=no,status=no,scrollbars=yes,resize=no,menubar=no") msgWindow.document.write(body); msgWindow.document.close(); return(true); } return(false); } function createtable() { var tmp3 tmp3 = 12; tmp1 = document.cont1.amt.value; tmp1 = tmp1.replace(/,/, ""); tmp1 = parseFloat(tmp1); var tmp2A = document.cont1.interest.value; tmp2 = tmp2A.replace(/,/, ""); tmp2 = parseFloat(tmp2); tmp4 = document.cont1.yrs.value; tmp4 = parseFloat(tmp4); tmp5 = document.cont1.firstyear.value; tmp5 = parseFloat(tmp5); var currInterest = 0 var currPrin = 0 prevBalance = tmp1; InterestRate = ( tmp2 / 100) / tmp3; Payment = (tmp1*((tmp2/(tmp3*100))/(1-(Math.pow(1+(tmp2/(tmp3*100)),((tmp4*tmp3)*-1)))))); MonthlyPayment = Payment; currStart = tmp5; for(i=1;i<=tmp4;i++) { for(j=1;j<=tmp3;j++) { periodInterest = prevBalance * InterestRate; periodPrin = MonthlyPayment - periodInterest; currBalance = prevBalance - periodPrin; currInterest += periodInterest; currPrin += periodPrin; prevBalance = currBalance; } if( currBalance <= 0 ) currBalance = 0; body = (body +""+ currStart +""+ formatCurrency(currInterest) +" "+ formatCurrency(currPrin) +" "+ formatCurrency(currBalance)+" "); currInterest = 0 currPrin = 0 currStart = parseInt(currStart) currStart += 1 if(currBalance<=0) { return(true) } } return (true) } function GenerateValue(tmp1,tmp2,tmp3,tmp5) { var str=tmp1; var tmp1=(str.replace(/,/, "")); var tmp4; tmp1 = parseFloat(tmp1); if (isNaN(tmp1)) tmp1=0; tmp2 = parseFloat(tmp2); if (isNaN(tmp2)) tmp2=0; tmp3 = parseFloat(tmp3); if (isNaN(tmp3)) tmp3=0; tmp4 = 12; Payment = (tmp1*((tmp2/(tmp4*100))/(1-(Math.pow(1+(tmp2/(tmp4*100)),((tmp3*tmp4)*-1)))))); Interest = ((Payment*(tmp3*tmp4))-tmp1); Payment = formatCurrency(Payment); Interest = formatCurrency(Interest); var show ="Your Monthly Payment for "+tmp3+" Years
at an Interest Rate of "+tmp2+"%
for a Loan Amount of $"+str+" is $"+Payment+" a Month and the total interest would be $"+Interest+".

"; document.getElementById("priceid1").innerHTML=show; return(true); } function writetext(){ document.getElementById('morgtage_calc').innerHTML = ''; } function loadfunctions(){ writetext(); chh(); } function formatCurrency(num) { num = num.toString().replace(/\$|\,/g,''); if(isNaN(num)) num = "0"; sign = (num == (num = Math.abs(num))); num = Math.floor(num*100+0.50000000001); cents = num%100; num = Math.floor(num/100).toString(); if(cents<10) cents = "0" + cents; for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++) num = num.substring(0,num.length-(4*i+3))+','+ num.substring(num.length-(4*i+3)); return (((sign)?'':'-') + '$' + num + '.' + cents); } window.onLoad=loadfunctions();