当仅单击“添加”按钮时,我试图调用两个函数。我遇到的问题是 calculate_balances 函数中的最后四个文本框没有输出它们的变量。
var $ = function (id) {
return document.getElementById(id);
}
// Declare Arrays to store information from Inputs //
var transactions = [];
transactions[0] = []; // holds date
transactions[1] = []; // holds transaction type
transactions[2] = []; // holds amount
// Function to print results to text area //
var update_results = function () {
var list = ""; // string variable to build output //
// check to see if arrays are empty //
if (transactions[0].length == 0) {
$("results").value = "";
} else {
list = "";
// for loop to cycle through arrays and build string for textarea output //
for (var i = 0; i < transactions[0].length; i++) {
list += transactions[0][i] + " " + transactions[1][i] + " " + transactions[2][i] + "\n";
}
// display results //
$("results").value = list;
}
}
// function to gather inputs //
var add_transaction = function () {
$("add").blur();
transactions[0][transactions[0].length] = $("date").value;
transactions[1][transactions[1].length] = $("transType").value;
transactions[2][transactions[2].length] = parseFloat( $("amount").value);
update_results();
calculate_balances();
}
// function for Calculations //
var calculate_balances = function () {
var startBal = 2000.00;
var ttlDeposits = 0;
var ttlWithdrawals = 0;
var endBal = startBal;
if (transactions[1][transactions[1].length] == "deposit")
{
ttlDeposits += transactions[2][transactions[2].length];
endBal += ttlDeposits;
}
if (transactions[1][i] == "withdrawal")
{
ttlWithdrawals += transactions[2][transactions[i]];
endBal -= ttlWithdrawals;
}
$("balStart").value = parseFloat(startBal);
$("ttlDeposits").value = parseFloat(ttlDeposits);
$("ttlWithdrawals").value = parseFloat(ttlWithdrawals);
$("balEnd").value = parseFloat(endBal);
}
window.onload = function () {
$("add").onclick = add_transaction, calculate_balances;
update_results();
}
谢谢你