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我有一個問題，從實際分配值之前試圖追加到頁面的ajax調用獲得的值。例如，當下面的sendRequest被調用時，我每次都會從網絡獲得價格響應，但是當我console.log時，有時會得到未定義的值。以粗體顯示評論。我已經嘗試使ajax請求同步和一個真正的貧民區setTimeout函數，但我仍然得到未定義的偶爾。我如何確保價格被附加到頁面上？如果我今天正在緩慢請善待我：d異步JavaScript問題，即使網絡有迴應但附加到頁面undefined
function updatePrices(IDs,callback){
var product_id= <?=$product_id ?>;
var qty= parseInt($j("#qtyUpdateBox input").val());
var customer_id = null;
<?php if (isset($customer_id)) {?>
customer_id = <?=$customer_id?>;
//$j('#vendorPriceListHeading').css({
//'width': '230px',
//'margin-left':'105px',
//'margin-right':'-80px'
// });
<?php }?>
if (qty==1){
function sendRequestOne(i) {
var optionSelectionArray = currentlySelectedAttributes(IDs[i]);
simpleWithAttrPrice(optionSelectionArray, customer_id, qty, function(data) {
var data= JSON.parse(data);
var unitPrice = parseFloat(roundDollar(data.basePrice));
$j('.details'+IDs[i]+ ' .priceBlock').empty();
$j('.details'+IDs[i]+ ' .priceBlock').append('<span>'+formatCurrency(unitPrice,"$")+'</span>');
$j('.details'+IDs[i]+ ' .vendorCheck input[name="customPrice"]:checked').val(unitPrice);
});
}//end sendRequest
for(i=0; i<IDs.length; i++)
{
sendRequestOne(i);
}
}//end if
else{
//ajax call to obtain tier prices for each vendor id
function sendRequest(i,qty,product_id){
var vendor = IDs[i];
$j.ajax({
type: "POST",
url: "/ajax_calls/updatePrices.php",
async:false,
data: { 'vendorID': vendor, 'product_id': product_id}
}).done(function(data) {
//CAITLIN below may need to be parsed in the php script
var data= JSON.parse(data);
var optionSelectionArray = currentlySelectedAttributes(vendor);
simpleWithAttrPrice(optionSelectionArray, customer_id, qty, function(price) {
var price= JSON.parse(price);
var unitPrice = roundDollar(parseFloat(price.basePrice));
var pricexQty= unitPrice * qty;
if (qty < data.tier2_range_start){
var unitPrice = totalPrice/qty;
}
else if (qty >= data.tier2_range_start && qty < data.tier3_range_start){
var discountPercent = data.tier2_discount;
var discount = pricexQty * data.tier2_discount/100;
var totalPrice = pricexQty - discount;
}
else if (qty >= data.tier3_range_start && qty < data.tier4_range_start){
var discountPercent = data.tier3_discount;
var discount = pricexQty * data.tier3_discount/100;
var totalPrice = pricexQty - discount;
}
else if (qty >= data.tier4_range_start && qty < data.tier5_range_start){
var discountPercent = data.tier4_discount;
var discount = pricexQty * data.tier4_discount/100;
var totalPrice = pricexQty - discount;
}
else if (qty >= data.tier5_range_start){
var discountPercent = data.tier5_discount;
var discount = pricexQty * data.tier5_discount/100;
var totalPrice = pricexQty - discount;
}
else{
console.log('Something went wrong');
}
var unitPrice = roundDollar(totalPrice/qty); //unitPrice including Shipping
setTimeout(function(){
//BELOW IS LOGGING UNDEFINED SOMETIMES, BUT AJAX RESPONSE HAS THE VALUES
console.log("The unit price is " + unitPrice + " and the discount percent is " + discountPercent);
$j('.details'+vendor+ ' .priceBlock').empty();//update product price in DOM
$j('.details'+vendor+ ' .priceBlock').append('<span>'+formatCurrency(unitPrice,"$")+'</span>');
//$j('.details'+data.vendor_id+ ' .priceBlock').append('<span>Total Price: '+formatCurrency(unitPrice*qty,"$")+'</span>');
$j('.details'+vendor+ ' .vendorCheck input[name="customPrice"]:checked').val(unitPrice);
$j('.details'+vendor+ ' .priceBlock').append('<h5 style="color:green">You will save '+discountPercent+'% !</h5>');
},1000);
});//end callback function
//reorderByPrice();
});//end done function
}//end function sendRequest
for(i=0; i<IDs.length; i++)
{
sendRequest(i,qty,product_id);
}
}//end else
if (callback) {
setTimeout(callback, 1);
}
}//end function
function simpleWithAttrPrice(optionSelectionArray, customer_id, qty, callback){
var product_id= <?=$product_id ?>;
$j.ajax({
type: "POST",
url: "/ajax_calls/obtainBasePrice.php",
data: { 'productID': product_id, 'optionSelectionArray' : optionSelectionArray, 'customer_id': customer_id, 'qty': qty}
}).done(callback);
}
更新價格Ajax調用PHP：
<?php
$dbname='secret';
require_once('/connect.php');
require_once('/app/Mage.php');
umask(0);
Mage::app();
$productModel = Mage::getModel('catalog/product');
$attr = $productModel->getResource()->getAttribute("vendor");
//post variable
$ID= $_POST['vendorID'];
//$ID= 1497;
//echo 'the id is initially ' .$ID;
if ($attr->usesSource()) {
$ID= $attr->getSource()->getOptionText($ID);
//echo $ID;
}
$product_id= $_POST['product_id'];
$echoArray= array();
if($ID == 3|| $ID ==4 || $ID ==11 || $ID ==12 || $ID ==13)
$sql = 'SELECT * FROM tier_pricing WHERE vendor_id=' . $ID;
else
$sql = 'SELECT * FROM tier_pricing WHERE vendor_id=' . $ID. ' AND product_id=' . $product_id;
foreach ($con->query($sql) as $row) {
$echoArray['vendor_id']= $row['vendor_id'];
$echoArray['tier2_range_start']= $row['tier2_range_start'];
$echoArray['tier2_range_stop']= $row['tier2_range_stop'];
$echoArray['tier3_range_start']= $row['tier3_range_start'];
$echoArray['tier3_range_stop']= $row['tier3_range_stop'];
$echoArray['tier4_range_start']= $row['tier4_range_start'];
$echoArray['tier4_range_stop']= $row['tier4_range_stop'];
$echoArray['tier5_range_start']= $row['tier5_range_start'];
$echoArray['tier2_discount']= $row['tier2_discount'];
$echoArray['tier3_discount']= $row['tier3_discount'];
$echoArray['tier4_discount']= $row['tier4_discount'];
$echoArray['tier5_discount']= $row['tier5_discount'];
}
echo json_encode($echoArray);
?>
響應屏幕截圖（所有Ajax調用返回正確的值）：
爲什麼setTimeout？ – cfs
我不知道我想它會給它時間分配值？只是一個微弱的嘗試。無論是否存在，都會發生同樣的事情。 – CaitlinHavener
不知道它是否與問題有關，但是您似乎認爲javascript已經爲您的變量阻塞了範圍，[它沒有]（http://stackoverflow.com/questions/12645073/java-vs -javascript-可變範圍）。 – jbabey