function mtg_pmt(loanAmt,intRate,payPeriod,amortPeriod,compPeriod) { if (intRate < 0 || intRate > 100) intRate=10; if (loanAmt <= 0 ) loanAmt=1000; if (amortPeriod <= 0) amortPeriod=1; intRate = intRate / 100; var top = 1 + (intRate / compPeriod); var factor = compPeriod / payPeriod; var EIRate = Math.pow(top,factor) - 1; var NPayP = amortPeriod * payPeriod; var PMT = (Math.pow((1+EIRate),NPayP)-1) / (EIRate*Math.pow(1+EIRate,NPayP)); PMT = loanAmt/PMT; PMT = Math.round(PMT*100)/100; return PMT; } function balance_remaining(amt,rate, pmt, pmtsPerYr, cmpdsPerYr, pmtsToTerm) { var L = 0.0; var B = 0.0; var mtgBal = 0.0; var pmtsPerCmpd = 0; pmtsPerCmpd = pmtsPerYr / cmpdsPerYr; L = Math.pow(1 + (rate / (100 * cmpdsPerYr)),(1 / pmtsPerCmpd)) - 1; B = 1 - Math.pow(1 + (rate / (100 * cmpdsPerYr)), -(pmtsToTerm / pmtsPerCmpd) ); B = (1 / L) * B; mtgBal = (amt - pmt * B) / (1 - L * B); mtgBal = Math.round(mtgBal*100)/100; return mtgBal; } function popup_value(theMenuObj) { return theMenuObj.options[theMenuObj.selectedIndex].value; } function requiredFieldsOK_mort1(fm) { //var fm = document.forms[0]; if (str_Empty(fm.loanAmt1)||str_Empty(fm.intRate1)||str_Empty(fm.amortPeriod1)||popup_Empty(fm.payPeriod1)||popup_Empty(fm.compPeriod1)) return false; return true; } function requiredFieldsOK_mort2(fm) { //var fm = document.forms[0]; if ((str_Empty(fm.loanAmt2)||str_Empty(fm.intRate2)||str_Empty(fm.amortPeriod2)||popup_Empty(fm.payPeriod2)||popup_Empty(fm.compPeriod2))) return false; return true; } function Cal_Payment_on_form(fm, doAlert) { clear_calculatedPmt(fm, "1"); var pmt = 0; var pmtsToTerm = 0; var bal = 0; //var fm = document.forms[0]; if (requiredFieldsOK_mort1(fm)) { if (fm.payPeriod1.selectedIndex == 3 || fm.payPeriod1.selectedIndex == 5) { pmt = mtg_pmt(filterNum(fm.loanAmt1.value),fm.intRate1.value,12,fm.amortPeriod1.value,popup_value(fm.compPeriod1)) if (fm.payPeriod1.options[fm.payPeriod1.selectedIndex].value == "26") pmt = pmt / 2; if (fm.payPeriod1.options[fm.payPeriod1.selectedIndex].value == "52") pmt = pmt / 4; pmtsToTerm = parseFloat(popup_value(fm.term1)) * parseInt(popup_value(fm.payPeriod1)); bal = balance_remaining(filterNum(fm.loanAmt1.value),fm.intRate1.value,pmt,popup_value(fm.payPeriod1),popup_value(fm.compPeriod1),pmtsToTerm) } else { pmt = mtg_pmt(filterNum(fm.loanAmt1.value),fm.intRate1.value,popup_value(fm.payPeriod1),fm.amortPeriod1.value,popup_value(fm.compPeriod1)) pmtsToTerm = parseFloat(popup_value(fm.term1)) * parseInt(popup_value(fm.payPeriod1)); bal = balance_remaining(filterNum(fm.loanAmt1.value),fm.intRate1.value,pmt,popup_value(fm.payPeriod1),popup_value(fm.compPeriod1),pmtsToTerm) } var mypmt = String(pmt); var mybal = String(bal); if (mypmt.indexOf(".") > 0) fm.calculatedPmt1.value = mypmt.substring(0, mypmt.indexOf(".") + 3); else fm.calculatedPmt1.value = mypmt; if (mybal.indexOf(".") > 0) fm.mtgBalance1.value = mybal.substring(0, mybal.indexOf(".") + 3); else fm.mtgBalance1.value = mybal; } else if (doAlert) alert(decodeMsg("COMPLETE_MORTGAGE_1")); } function do_calc2_on_form(fm, doAlert) { clear_calculatedPmt(fm, "2"); var pmt = 0; var pmtsToTerm = 0; var bal = 0; // var fm = document.forms[0]; if (requiredFieldsOK_mort2(fm)) { if (fm.payPeriod2.selectedIndex == 3 || fm.payPeriod2.selectedIndex == 5) { pmt = mtg_pmt(filterNum(fm.loanAmt2.value),fm.intRate2.value,12,fm.amortPeriod2.value,popup_value(fm.compPeriod2)) if (fm.payPeriod2.options[fm.payPeriod2.selectedIndex].value == "26") pmt = pmt / 2; if (fm.payPeriod2.options[fm.payPeriod2.selectedIndex].value == "52") pmt = pmt / 4; pmtsToTerm = parseFloat(popup_value(fm.term2)) * parseInt(popup_value(fm.payPeriod2)); bal = balance_remaining(filterNum(fm.loanAmt2.value),fm.intRate2.value,pmt,popup_value(fm.payPeriod2),popup_value(fm.compPeriod2),pmtsToTerm) } else { pmt = mtg_pmt(filterNum(fm.loanAmt2.value),fm.intRate2.value,popup_value(fm.payPeriod2),fm.amortPeriod2.value,popup_value(fm.compPeriod2)) pmtsToTerm = parseFloat(popup_value(fm.term2)) * parseInt(popup_value(fm.payPeriod2)); bal = balance_remaining(filterNum(fm.loanAmt2.value),fm.intRate2.value,pmt,popup_value(fm.payPeriod2),popup_value(fm.compPeriod2),pmtsToTerm) } var mypmt = String(pmt); var mybal = String(bal); if (mypmt.indexOf(".") > 0) fm.calculatedPmt2.value = mypmt.substring(0, mypmt.indexOf(".") + 3); else fm.calculatedPmt2.value = mypmt; if (mybal.indexOf(".") > 0) fm.mtgBalance2.value = mybal.substring(0, mybal.indexOf(".") + 3); else fm.mtgBalance2.value = mybal; } // else if (doAlert) // alert(decodeMsg("COMPLETE_MORTGAGE_2")); } function clear_calculatedPmt (fm, which) { //var fm = document.forms[0]; if (which == "2") { fm.calculatedPmt2.value = ''; fm.mtgBalance2.value = ''; } else { fm.calculatedPmt1.value = ''; fm.mtgBalance1.value = ''; } } function submit_for_amort (fm) { if (requiredFieldsOK_mort1(fm) && requiredFieldsOK_mort2(fm) ) /*document.forms[0]*/ fm.submit(); else alert(decodeMsg("COMPLETE_FOR_AMORTIZ")); }