我昨天有这个工作，但已经做了一些事情来打破它，似乎无法找到它是什么。 JavaScript只是不再创建UL和LI元素。很抱歉，我还是JavaScript的新手（以及一般的编码），所以对我来说调试仍然很困难，尤其是逻辑错误。我尝试在Firefox中检查Firebug，但我只是没有看到错误。
基本上页面应该在左栏显示带有缩略图pics的吉他列表（nav id =＆＃34;吉他＆＃34;），然后当你点击一个时，右边的较大列填充较大的图片和关于吉他的文本（JSON文件）。
这是我的HTML源代码和JavaScript：
// Find links for filtering the display
var range = document.querySelectorAll('.range');
for(var link in range){
range[link].onclick= function(){
filter(this.dataset.low, this.dataset.high);
}
}
var myJSON = null;
function filter(json,low,high){
clear("#display");
var display = document.querySelector("#display");
for(var key in json){
//UL
var ul = document.createElement("ul");
var image = createImage(json[key].name, ul); // pass the name as 'file' to our fucntion of createImage
for(var subkey in json[key]){
//LI
var li = document.createElement("li");
var txt = document.createTextNode(subkey +" "+ json[key][subkey]);
// key = main level of json
// subkey = properties within each level of an object for JSON
li.appendChild(txt);
ul.appendChild(li);
} // end for subkey
display.appendChild(ul);
} // end for key
} // end filter function
function Guitars(json){
clear("#guitars");
var display = document.querySelector("#guitars");
for(var key in json){
var ul = document.createElement("ul");
var li = document.createElement("li");
li.dataset.key = key; // <li data-key="0" Yoda>
li.onclick = viewGuitars;
var image = createImage(json[key].name, li); // pass the name as 'file' to our fucntion of createImage
var txt = document.createTextNode(json[key].name);
li.appendChild(txt);
ul.appendChild(li);
display.appendChild(ul);
} // end for key
} // end filter function
function viewGuitars(){
var single = myJSON[this.dataset.key]; /* get the single info for a JSON element, this === clicked li element in HTML */
clear("#display");
var display = document.querySelector("#display");
//UL
//if(low < json[key].cost && json[key].cost <= high){
var ul = document.createElement("ul");
var image = createImage(single.name, ul); // pass the name as 'file' to our fucntion of createImage
for(var subkey in single){
//LI
var li = document.createElement("li");
var txt = document.createTextNode(subkey +" "+ single[subkey]);
// key = main level of json
// subkey = properties within each level of an object for JSON
li.appendChild(txt);
ul.appendChild(li);
} // end for subkey
display.appendChild(ul);
} // end for function
function log(msg){
console.log(msg);
}
function clear(target){
var t = document.querySelector(target);
while(t.hasChildNodes()){
t.removeChild(t.firstChild);
}
}
function loadJSON(callback) {
var xobj = new XMLHttpRequest();
xobj.overrideMimeType("application/json");
xobj.open('GET', 'guitars.json', true); // Replace 'my_data' with the path to your file
xobj.onreadystatechange = function () {
if (xobj.readyState == 4 && xobj.status == "200") {
// Required use of an anonymous callback as .open will NOT return a value but simply returns undefined in asynchronous mode
callback(xobj.responseText);
}
};
xobj.send(null);
}
loadJSON(function(response){
myJSON = JSON.parse(response);
filter(myJSON);
// Build the character list
character(myJSON);
});
function createImage(file, parent, w=50){
//set a var to the replaced text
//log the repalced text var
var str = file.toLowerCase(); //Look for guitars name in JSON file and make them LowerCase, ex. return back "gibson sg"
var filename = str.replace(/\s/g, ""); //find blank space (/\s/g | s = space, g = global) and remove it
filename = ("photos/"+filename+".jpg");
var image = new Image(); // Make a new IMG object
image.src = filename;
image.style.width = w+"%";
image.style.height = "auto";
image.onload = function(){
log('good ' + file );
parent.appendChild(image); //adds the image to the page!
}
image.onerror = function(){
log('not able to load ' + filename );
//parent.appendChild(image);
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>JSON</title>
<style>
#guitars {
width:200px;
float:left;
}
#guitars img {display:block}
#guitars li {
cursor: pointer;
}
#guitars li:hover {
background-color: #000;
color: #FFF;
}
#display {
width:800px;
float:left;
}
</style>
</head>
<body>
<nav id="guitars">
Guitar names to appear here
</nav>
<section id="display">
</section>
<script src="script.js"></script>
</body>
</html>
...这是我的JSON文件：
[
{
"MAKE":"Gibson",
"MODEL":"SG",
"COLOR":"Black",
"BODY-TYPE":"Solid, 2x pointed horns",
"WOOD":"Mahogany",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Gibson",
"MODEL":"Les Paul",
"COLOR":"Gold",
"BODY-TYPE":"Solid, 1 pointed horn, 1 rounded",
"WOOD":"Mahogany",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Gibson",
"MODEL":"Firebird",
"COLOR":"Red",
"BODY-TYPE":"Solid, \"Z\" shaped w/ rounded horns",
"WOOD":"Mahogany",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Gibson",
"MODEL":"Explorer",
"COLOR":"Burgandy",
"BODY-TYPE":"Solid, \"Z\" shaped w/ pointed horns",
"WOOD":"Mahogany",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Gibson",
"MODEL":"Flying V",
"COLOR":"Yellow",
"BODY-TYPE":"Solid, \"V\" shaped w/ pointed horns",
"WOOD":"Mahogany",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Fender ",
"MODEL":"Stratocaster",
"COLOR":"Aqua Blue",
"BODY-TYPE":"Solid, w bolt-on neck",
"WOOD":"Alder, Ash, Poplar (varies)",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Fender ",
"MODEL":"Telecaster",
"COLOR":"\"Sunburst\"",
"BODY-TYPE":"Solid, w bolt-on neck",
"WOOD":"Alder, Ash, Poplar (varies)",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Fender ",
"MODEL":"Jaguar",
"COLOR":"Brown",
"BODY-TYPE":"Solid, w bolt-on neck",
"WOOD":"Alder, Ash, Poplar (varies)",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Fender ",
"MODEL":"Mustang",
"COLOR":"Bright Red",
"BODY-TYPE":"Solid, w bolt-on neck",
"WOOD":"Alder, Ash, Poplar (varies)",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Paul Reed Smith",
"MODEL":"SE Standard",
"COLOR":"Silver",
"BODY-TYPE":"Solid, 2x pointed horns",
"WOOD":"Maple",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Paul Reed Smith",
"MODEL":"Dragon",
"COLOR":"Orange",
"BODY-TYPE":"Solid, 2x pointed horns",
"WOOD":"Maple",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Paul Reed Smith",
"MODEL":"McCarthy",
"COLOR":"Dark Brown",
"BODY-TYPE":"Solid, 2x pointed horns",
"WOOD":"Maple",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Gretsch",
"MODEL":"Jupiter Thunderbird",
"COLOR":"Black",
"BODY-TYPE":"Solid, Asymetrical shape",
"WOOD":"Mahogany",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Gretsch",
"MODEL":"White Falcon",
"COLOR":"White",
"BODY-TYPE":"Semi-hollow, 1 pointed horn, 1 rounded",
"WOOD":"Spruce",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Gretsch",
"MODEL":"Triple Jet",
"COLOR":"Copper",
"BODY-TYPE":"Semi-hollow, 1 pointed horn, 1 rounded",
"WOOD":"Mahogany",
"ACOUSITC/ELECTRIC":"Electric"
},
{
"MAKE":"Martin",
"MODEL":"D-28",
"COLOR":"Natural wood",
"BODY-TYPE":"Hollow, \"dreadnought\" design",
"WOOD":"Spruce",
"ACOUSITC/ELECTRIC":"Acoustic"
},
{
"MAKE":"Martin",
"MODEL":"D-18",
"COLOR":"Natural wood",
"BODY-TYPE":"Hollow, \"dreadnought\" design",
"WOOD":"Spruce",
"ACOUSITC/ELECTRIC":"Acoustic"
},
{
"MAKE":"Taylor",
"MODEL":"310",
"COLOR":"Natural wood",
"BODY-TYPE":"Hollow, \"dreadnought\" design",
"WOOD":"Rosewood",
"ACOUSITC/ELECTRIC":"Acoustic"
},
{
"MAKE":"Taylor",
"MODEL":"360e",
"COLOR":"Natural wood",
"BODY-TYPE":"Hollow, \"dreadnought\" design",
"WOOD":"Rosewood",
"ACOUSITC/ELECTRIC":"Acoustic"
}
]
任何帮助非常感谢!!
答案 0 :(得分：0)