Javacript calculation

Question

khaleel_rashid 0 Newbie Poster

14 Years Ago

this is my function which is calculating values. But if any of the values is empty it does not calculate the total payment value. if there is any simple way to calculate pls let me know

function startCalc(){
interval = setInterval("calc()",1);}

function calc(){
				
 room_charges = document.ipd_bill.room_charges.value ;
  lab_charges = document.ipd_bill.lab_charges.value;
  consultancy_fees = document.ipd_bill.consultancy_fees.value;
  blood_charges = document.ipd_bill.blood_charges.value; 
organ_charges = document.ipd_bill.organ_charges.value; 
discount = document.ipd_bill.discount.value;
document.ipd_bill.total_payment.value = eval(room_charges) + eval(lab_charges) + eval(consultancy_fees) + eval(blood_charges) + eval(organ_charges) - discount;
}

function stopCalc(){
	clearInterval(interval);
		}

javascript

2 Contributors
3 Replies
99 Views
15 Hours Discussion Span
Latest Post 14 Years Ago Latest Post by hielo

hielo 65 Veteran Poster

14 Years Ago

try:

function calc(){
				
 room_charges = isNaN(parseInt(document.ipd_bill.room_charges.value)) ? 0 :  parseInt(document.ipd_bill.room_charges.value);
  lab_charges = isNaN(parseInt(document.ipd_bill.lab_charges.value)) ? 0 :  parseInt(document.ipd_bill.lab_charges.value);
  consultancy_fees = isNaN(parseInt(document.ipd_bill.consultancy_fees.value)) ? 0 :  parseInt(document.ipd_bill.consultancy_fees.value);
  blood_charges = isNaN(parseInt(document.ipd_bill.blood_charges.value)) ? 0 :  parseInt(document.ipd_bill.blood_charges.value); 
organ_charges = isNaN(parseInt(document.ipd_bill.organ_charges.value)) ? 0 :  parseInt(document.ipd_bill.organ_charges.value); 
discount = isNaN(parseInt(document.ipd_bill.discount.value)) ? 0 :  parseInt(document.ipd_bill.discount.value);
document.ipd_bill.total_payment.value = eval(room_charges) + eval(lab_charges) + eval(consultancy_fees) + eval(blood_charges) + eval(organ_charges) - discount;
}

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khaleel_rashid 0 Newbie Poster · Answer 1 · 2010-09-13T11:30:29+00:00

hielo

It is giving the following error. Actually i am get room charges, lab charges values from database using ajax. Then i am doing the total and subracting discount. if any of the charges is not available it gives the error.

Message: 'document.ipd_bill.room_charges.value' is null or not an object

hielo 65 Veteran Poster · Answer 2 · 2010-09-13T19:45:22+00:00

you are probably "erasing" your original field OR the field is not in the DOM when you call the function. Can't tell you for sure without looking at your actual page online!