我遇到的问题是，从下拉菜单中选择一个项目后，我发出的 AJAX 请求会闪烁。从闪烁的文本来看，该请求似乎正在提取正确的信息。
它的工作方式是将鼠标悬停在下拉菜单上，然后单击 anchor 标记时显示类型电影。
我认为正在发生的事情是，在做出另一个选择之前我不会保留该流派，如果是我如何在选择新流派之前保留该流派值？如果不是我做错了什么？
我从代码中删除了所有“绒毛”，这样我们就只剩下骨架了。
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<script src="script.js"></script>
<style>
.dropdown{
width: 151px;
}
.dropbtn{
width: 150px;
height: 30px;
border: 1px solid black;
border-radius: 2px;
background: white;
}
a{
display: block;
background-color: lightgreen;
width: 148px;
height: 30px;
text-align: center;
text-decoration: none;
padding-top: 10px;
border-bottom: 1px solid black;
border-right: 1px solid black;
border-left: 1px solid black;
}
a:hover{
background-color: lightblue;
}
.content{
display: none;
}
.dropdown:hover .content{
display: block;
}
</style>
</head>
<body onload='movieScript()'>
<div class="dropdown">
<button class="dropbtn">Select</button>
<div class="content">
<a class="anchor" href="" onclick="generateMovies('Comedy')">Comedy</a>
<a class="anchor" href="" onclick="generateMovies('Action')">Action</a>
<a class="anchor" href="" onclick="generateMovies('Biography')">Biography</a>
<a class="anchor" href="" onclick="generateMovies('Drama')">Drama</a>
<a class="anchor" href="" onclick="generateMovies('Crime')">Crime</a>
</div>
</div>
<div id="selectedMovies"></div>
</body>
</html>
JS:
var titles = [];//Will hold an array of titles
var imgs = [];//Will hold an array of imgs
var pos = 0;//Global position indicator which will be shared by all global arrays
movieScript = function(){
var movieData = "http://test.frontendhero.nl/movie-challenge/movies.json";
var myRequest;
//Test if XMLHttpRequest is available in active browser
try{
myRequest = new XMLHttpRequest();
}
catch(e){
try{
myRequest = new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
try{
myRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e){
alert("Something broke!");
return false;
}
}
}
myRequest.onreadystatechange = function(){
if(myRequest.readyState === 4 && myRequest.status === 200){
var jsonObj = JSON.parse(myRequest.responseText);//Grabs json object
var data = jsonObj.data; //Grabbing data objects from json
var assets; //Will hold array of data objects
var movies =[]; //Array for actionMovie objects
var DOM = document.getElementById('selectedMovies');
generateMovies = function(userGenre){
//Outer level of json
for(var key in data){
assets = data[key].assets;
//Movie data of the json file cross checked with user selected genre
for(var x in assets){
if(assets[x].genre === userGenre){
movies[x] = assets[x];
}
}
}
//Add each element to an array of titles and imgms
for(var key in movies){
DOM.innerHTML = movies[key].title + movies[key].img;
}
}
}
}
myRequest.open("GET", movieData, true);
myRequest.send();
};
感谢任何帮助。
请您参考如下方法:
当您点击该链接时，它会链接到 href URL，空 URL 意味着重新加载当前页面。您可以通过从 onclick 返回 false 来防止这种情况:
<a class="anchor" href="" onclick="generateMovies('Comedy'); return false;">Comedy</a>
或者您可以使用 javascript:void(0) URL:
<a class="anchor" href="javascript:void(0)" onclick="generateMovies('Comedy')">Comedy</a>
或者您可以使用您发现的# URL。
