我正在使用一个从YouTube API获取playlistItem数据的应用程序，并使用QuinteT.js在页面上的播放列表中列出了所有标题。我可以将列表加载得很好，但是我遇到了一些问题，同时试图为应用程序添加一些额外的功能。
我要添加的内容是播放列表中标题总数的计数和一个让用户加载另一个播放列表的输入字段。我目前都无法工作。这是app.js文件：
// global variables
var ytResults=[];
var pageToken;
//var clipCount=ko.observable('');
var clipsDone=0;
var ytPlaylistID='PLpmQJ2D10iJx_GEYNZwAON38cluj0dNj4';
// function to create clip objects
var clip=function(data){
this.clipTitle=ko.observable(data.title);
};
function Model(){
var self=this;
//Create an observable array to store a list of clip objects
self.clipList=ko.observableArray([]);
self.clipCount=ko.observable('');
}
var model =new Model();
function ViewModel(){
var self = this;
self.errorMessage=ko.observable('');
self.loadPlaylist=ko.observable('');
errorHandling=function(){
self.errorMessage("Can't load the list and app");
};
fillList=function(){
for(i=0;i<ytResults.length;i++){
var clipData={
title: ytResults[i]
};
model.clipList.push(new clip(clipData));
};
};
var ytConnector=(function(){
var searchYtRequest=function(requestPayload, callback){
$.ajax({
url: requestPayload.url,
type: requestPayload.method,
}).done(function(data){
//console.log(data);
model.clipCount=data.pageInfo.totalResults;
ytResults.length=0;
for(i=0;i<data.items.length;i++){
ytResults=ytResults.concat(data.items[i].snippet.title);
};
fillList();
pageToken=data.nextPageToken;
clipsDone=clipsDone+50;
if(clipsDone<model.clipCount){
ytConnector.fetchDataFromYt();
};
}).fail(function(jqxhr, textStatus, error) {
// Let empty results set indicate problem with load.
// If there is no callback - there are no UI dependencies
self.errorMessage("Failed to load: " + textStatus + ", " + error);
}).always(function() {
typeof callback === 'function' && callback(ytResults);
});
};
// get playlist data from youtube
function fetchDataFromYt(){
if(pageToken!=null){
thisUrl='https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&maxResults=50&playlistId='+ytPlaylistID+'&key=AIzaSyBFrCeUpPitoT6eOk_mq6Uza6etWtAH0oQ&pageToken='+pageToken;
}else{
thisUrl='https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&maxResults=50&playlistId='+ytPlaylistID+'&key=AIzaSyBFrCeUpPitoT6eOk_mq6Uza6etWtAH0oQ';
};
var requestData = {
url: thisUrl,
method: 'GET',
};
searchYtRequest(requestData);
}return{
fetchDataFromYt: fetchDataFromYt,
};
})();
ytConnector.fetchDataFromYt();
thisPlaylist=function(){
ytPlaylistID=self.loadPlaylist();
console.log('playlist ID: '+ytPlaylistID);
};
}
ko.applyBindings(new ViewModel());
// PLpmQJ2D10iJzd1SPy7FlaaBFt07fhLSL3
这是HTML：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://fonts.googleapis.com/css?family=Telex|Aldrich" rel="stylesheet">
<link href="css/style.css" rel="stylesheet">
<title>Youtube playlist</title>
</head>
<body>
<div class="container">
<div class="errorMsg" data-bind="text: errorMessage, visible: errorMessage">
</div>
<div class="form-holder">
<form data-bind="submit: thisPlaylist">
playlist ID: <input type="text" size="50" data-bind="value: loadPlaylist, valueUpdate: 'afterkeydown'">
<button type="submit" data-bind="enable: loadPlaylist().length>0">submit</button>
</form>
</div>
<div class="info-holder">
clips in playlist:<span data-bind="text: model.clipCount"></span>
</div>
<ul class="listDiv" data-bind="foreach: model.clipList">
<li data-bind="text: clipTitle">
</ul>
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="js/lib/knockout-3.2.0.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/hmac-sha1.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/enc-base64-min.js"></script>
<script src="js/oauth-1.0a.js"></script>
<script src="js/app.js"></script>
</body>
model.clipCound是一个可观察的对象，设置值不正确。
model.clipCount=data.pageInfo.totalResults;
您需要更改此
model.clipCount(data.pageInfo.totalResults);