/* Copyright (c) 2003, 2005 by Jon Roma. All rights reserved. $URL: svn://zippy.cso.uiuc.edu/RMCA/trunk/new/store/meetreg.js $ $Revision: 2805 $ $Date: 2005-09-18 16:46:43 -0500 (Sun, 18 Sep 2005) $ */ var isDebug = 0; // global debug flag var isPayPal = 1; // handling PayPal or a mail-in form /* PayPal fee details, assuming fee = (subtotal * fraction) + flat IMPORTANT: MUST be kept consistent with similar perl code */ var feeFraction = 0.029; // fractional portion of fee (2.9%) var feeFlat = 0.30; // flat portion of fee (30 cents) function computePayPalFee(subtotal) { // this MUST be kept in sync with counterpart perl routine if (! isPayPal || subtotal == 0) return 0.0; return (feeFraction * ((subtotal + feeFlat) / (1 - feeFraction))) + feeFlat; } // function recomputeCart() { var f = document.getElementById('form_local'); // compute item totals and subtotal var i; var st = 0; for (i = 0; i < itemCount; i++) { var io = document.getElementById('subtotal_' + i); var it = (getItemValue(i, 'amount') * getItemValue(i, 'quantity')); st += it; // compute subtotal from item totals // io.innerHTML = (it) ? ('$' + toMoney(it)) : ''; io.innerHTML = '$' + toMoney(it); } // find objects for updating totals var ho = document.getElementById('handling'); var so = document.getElementById('subtotal'); var to = document.getElementById('total'); // compute PayPal fee and total var ht = computePayPalFee(st); // compute fee var t = st + ht; if (isPayPal) { // so.innerHTML = (st) ? ('$' + toMoney(st)) : ''; so.innerHTML = '$' + toMoney(st); // ho.innerHTML = (ht) ? ('$' + toMoney(ht)) : ''; ho.innerHTML = '$' + toMoney(ht); } // to.innerHTML = (t) ? ('$' + toMoney(t)) : ''; to.innerHTML = '$' + toMoney(t); return 1; } // gets a numeric value from a numbered element inside form_local function getItemValue(n, what) { var f = document.getElementById('form_local'); var pattern = /^([a-z]+)_([0-9]+)$/; var i; for (i = 0; i < f.elements.length; i++) { var e = f.elements[i]; var r = pattern.exec(e.name); if (r != null && r.length == 3 && r[1] == what && r[2] == n) return (! e.value || isNaN(e.value)) ? 0 : e.value; } return 0; // fallback to zero value } // function toMoney(v) { var c; if (v == null || isNaN(v)) return null; // undefined value specified v = Math.round(v * 100); c = (v % 100).toString(); // separate fractional component if (c < 10) c = '0' + c; while (c.length < 2) // append trailing zeros to fill c += '0'; return Math.floor(v / 100) + '.' + c; // return concatenated values } // function paypalPrepare() { var dstForm = document.getElementById('form_paypal'); var srcForm = document.getElementById('form_local'); var tplForm = document.getElementById('form_template'); if (isDebug) alert("Preparing form for submission"); var st = 0; // delete existing destination form and start fresh if (dstForm) { // depends on form being immediate child of element document.body.removeChild(dstForm); } dstForm = document.createElement('form'); dstForm.id = 'form_paypal'; // depends on form being immediate child of element document.body.appendChild(dstForm); var srcIndex; // index into source or template form var dstIndex = 0; // index into destination form var totalAmount = 0.0; for (srcIndex = 0; srcIndex < itemCount; srcIndex++) { var iAmount = getItemValue(srcIndex, 'amount'); var iQuantity = getItemValue(srcIndex, 'quantity'); var iName = eval('srcForm.item_name_' + srcIndex + '.value'); var iNumber = eval('srcForm.item_number_' + srcIndex + '.value'); if (iAmount == 0 || iQuantity == 0) continue; // skip zero quantity or zero price totalAmount += (iAmount * iQuantity); // recompute total dstIndex++; // increment destination form index appendIndexedFormInput(dstForm, dstIndex, 'item_name', iName); appendIndexedFormInput(dstForm, dstIndex, 'item_number', iNumber); appendIndexedFormInput(dstForm, dstIndex, 'amount', toMoney(iAmount)); appendIndexedFormInput(dstForm, dstIndex, 'quantity', iQuantity); } // return error if nothing selected if (dstIndex == 0) { alert ( "No items were selected." + "\n\n" + "Please select one or more items before clicking on " + "'" + document.getElementById('submit').innerHTML + "' button." ); return 0; } dstIndex++; // compute PayPal fee and append item for said fee if (computePayPalFee(totalAmount) > 0.0) { var handlingAmount = toMoney(computePayPalFee(totalAmount)); appendIndexedFormInput(dstForm, dstIndex, 'item_name', 'Handling fee'); appendIndexedFormInput(dstForm, dstIndex, 'amount', handlingAmount); appendIndexedFormInput(dstForm, dstIndex, 'quantity', 1); } // update common data from template updateFormFromTemplate(tplForm, dstForm); if (isDebug) { var s = ''; for (dstIndex = 0; dstIndex < dstForm.elements.length; dstIndex++) { var e = dstForm.elements[dstIndex]; // form's element collection s += ('name: ' + e.name + ' value: ' + e.value + "\n"); } if (s) alert("Destination form:\n" + s); } dstForm.submit(); // submit constructed form return 1; } // function appendIndexedFormInput(form, index, name, value) { var e = document.createElement('input') e.type = 'hidden'; e.name = name + '_' + index; e.value = value; form.appendChild(e); return e; } function updateFormFromTemplate(tplForm, dstForm) { // copy action and method from template to destination form dstForm.action = tplForm.action; dstForm.method = tplForm.method; // copy each template element to destination form var srcIndex; for (srcIndex = 0; srcIndex < tplForm.elements.length; srcIndex++) { var srcElement = tplForm.elements[srcIndex]; var dstElement = document.createElement('input'); dstElement.type = 'hidden'; dstElement.name = srcElement.name; dstElement.value = srcElement.value; dstForm.appendChild(dstElement); } return 1; }