[英]JS Function Scope with Ebay API
js初學者在這里。 ebay網站上有示例代碼,用於使用javascript發送api請求。 該代碼開箱即用,但是當我將整個代碼包裝在以下代碼中時,代碼將中斷:
(document).ready( function() { ('button').click( function() { //(ebays sample code here) }); });
谷歌瀏覽器控制台說我的錯誤是:
Uncaught ReferenceError: _cb_findItemsByKeywords is not defined
at http://svcs.ebay.com/services/search/FindingService/v1?OPERATION-NAME=findItemsByKeywords&SERVICE-VERSION=1.0.0&SECURITY-APPNAME=micahelr-layitont-PRD-f51ca6568-6366e278&GLOBAL-ID=EBAY-US&RESPONSE-DATA-FORMAT=JSON&callback=_cb_findItemsByKeywords&REST-PAYLOAD&keywords=accord&paginationInput.entriesPerPage=5&itemFilter(0).name=MaxPrice&itemFilter(0).value=30&itemFilter(0).paramName=USD&itemFilter(1).name=ListingType&itemFilter(1).value(0)=AuctionWithBIN&itemFilter(1).value(1)=FixedPrice:1:5
(anonymous) @ svcs.ebay.com/services/search/FindingService/v1?OPERATION-NAME=findItemsByKeywords&SERVICE-VERSION=1.0.0&SECURITY-APPNAME=micahelr-layitont-PRD-f51ca6568-6366e278&GLOBAL-ID=EBAY-US&RESPONSE-DATA-FORMAT=JSON&callback=_cb_findItemsByKeywords&REST-PAYLOAD&keywords=accord&paginationInput.entriesPerPage=5&itemFilter(0).name=MaxPrice&itemFilter(0).value=30&itemFilter(0).paramName=USD&itemFilter(1).name=ListingType&itemFilter(1).value(0)=AuctionWithBIN&itemFilter(1).value(1)=FixedPrice:1
我想出的是,我的回調函數的范圍不正確。 我將.ready()
和.click()
語句移到了腳本標記內的許多不同位置,試圖解決該問題而不完全了解如何解決。 我嘗試閱讀有關函數范圍的內容,但似乎我無法弄清楚。 以下是帶有嵌入式JS代碼的mt HTML文件的內容:
<html>
<head>
</head>
<body>
<button>click</button>
<script>
$(document).ready(function() {
$('button').click( function() {
var urlfilter = "";
item_MaxPrice = Number(document.getElementById('pagePrice').innerHTML);
inputKeywords = 'accord';
var filterarray = [ {"name":"MaxPrice", "value":item_MaxPrice, "paramName":"USD"}, ];
function _cb_findItemsByKeywords(root) {
var items = root.findItemsByKeywordsResponse[0].searchResult[0].item || [];
var html = [];
html.push('<table width="100%" border="0" cellspacing="0" cellpadding="3">
for (var i = 0; i < items.length; ++i) {
var item = items[i];
html.push('text here');};
document.getElementById("results").innerHTML = html.join("");};
// Generates an indexed URL snippet from the array of item filters
function buildURLArray() {
for(var i=0; i<filterarray.length; i++) {
var itemfilter = filterarray[i];
for(var index in itemfilter) {
if (itemfilter[index] !== "") {
if (itemfilter[index] instanceof Array) {
for(var r=0; r<itemfilter[index].length; r++) {
var value = itemfilter[index][r];
urlfilter += "&itemFilter\(" + i + "\)." + index + "\(" + r + "\)=" + value ;
}
}
else {
urlfilter += "&itemFilter\(" + i + "\)." + index + "=" +
itemfilter[index];
}}}}}
// Execute the function to build the URL filter
buildURLArray(filterarray);
var url = "http://svcs.ebay.com/services/search/FindingService/v1";
url += "?OPERATION-NAME=findItemsByKeywords";
url += "&SERVICE-VERSION=1.0.0";
url += "&SECURITY-APPNAME=micahelr-layitont-PRD-f51ca6568-6366e278";
url += "&GLOBAL-ID=EBAY-US";
url += "&RESPONSE-DATA-FORMAT=JSON";
url += "&callback=_cb_findItemsByKeywords";
url += "&REST-PAYLOAD";
url += "&keywords="+inputKeywords;
url += "&paginationInput.entriesPerPage=5";
url += urlfilter;
s=document.createElement('script'); // create script element
s.src= url;
document.body.appendChild(s);
document.write("<a href='" + url + "'>" + url + "</a>");
})});
</script>
</body>
<footer>©darnell cross 2018</footer>
</html>
希望這可以幫助您了解縮進級別的范圍。 通常,縮進時可以使用它來幫助您可視化范圍級別。 可以在子級中訪問在父級范圍中聲明的變量,但不能以其他方式訪問。
<html>
<head>
</head>
<body>
<button>click</button>
<script>
$(document).ready(function() {
$('button').click(function() {
//start of scope
var urlfilter = "";
item_MaxPrice = Number(document.getElementById('pagePrice').innerHTML);
inputKeywords = 'accord';
var filterarray = [{
"name": "MaxPrice",
"value": item_MaxPrice,
"paramName": "USD"
}, ];
function _cb_findItemsByKeywords(root) {
var items = root.findItemsByKeywordsResponse[0].searchResult[0].item || [];
var html = [];
html.push('<table width="100%" border="0" cellspacing="0" cellpadding="3">
for (var i = 0; i < items.length; ++i) {
//start of new scope (can access everything in parent scope but nothing in a scope that is further nested
var item = items[i];
html.push('text here');
//end of new scope
}; document.getElementById("results").innerHTML = html.join("");
};
// Generates an indexed URL snippet from the array of item filters
function buildURLArray() {
for (var i = 0; i < filterarray.length; i++) {
var itemfilter = filterarray[i];
for (var index in itemfilter) {
if (itemfilter[index] !== "") {
if (itemfilter[index] instanceof Array) {
for (var r = 0; r < itemfilter[index].length; r++) {
var value = itemfilter[index][r];
urlfilter += "&itemFilter\(" + i + "\)." + index + "\(" + r + "\)=" + value;
}
} else {
urlfilter += "&itemFilter\(" + i + "\)." + index + "=" +
itemfilter[index];
}
}
}
}
}
// Execute the function to build the URL filter
buildURLArray(filterarray);
var url = "http://svcs.ebay.com/services/search/FindingService/v1";
url += "?OPERATION-NAME=findItemsByKeywords";
url += "&SERVICE-VERSION=1.0.0";
url += "&SECURITY-APPNAME=micahelr-layitont-PRD-f51ca6568-6366e278";
url += "&GLOBAL-ID=EBAY-US";
url += "&RESPONSE-DATA-FORMAT=JSON";
url += "&callback=_cb_findItemsByKeywords";
url += "&REST-PAYLOAD";
url += "&keywords=" + inputKeywords;
url += "&paginationInput.entriesPerPage=5";
url += urlfilter;
s = document.createElement('script'); // create script element
s.src = url;
document.body.appendChild(s);
document.write("<a href='" + url + "'>" + url + "</a>");
})
//end of button scope
});
</script>
</body>
<footer>©darnell cross 2018</footer>
</html>
未捕獲的ReferenceError:_cb_findItemsByKeywords未定義
您收到此錯誤是因為Javascript無法找到_cb_findItemsByKeywords函數。
問題是什么?
您正在創建一個腳本元素並將其添加到DOM中,該DOM具有_cb_findItemsByKeywords函數作為URL中的回調。
s = document.createElement('script'); //創建腳本元素s.src = url; document.body.appendChild(s); document.write(“” + url +“”);
現在,該腳本將在全局上下文中運行,並且在那里找不到任何_cb_findItemsByKeywords函數,因為您是在另一個函數內部定義了該腳本。
$(document).ready(function() {...}
(請記住:每個函數都會創建自己的上下文)
解:
將_cb_findItemsByKeywords函數添加到窗口對象。
window._cb_findItemsByKeywords = function() {...}
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