用户选择艺术家和标题后，单击“显示”按钮时，我想显示一个包含该艺术家和标题的所有信息(标题、艺术家、国家/地区、公司、年份、价格)的表格。但是我的代码只运行第一个选项。我该如何修复它？
<!DOCTYPE html>
<html>
<style>
table,th,td {
border : 1px solid black;
border-collapse: collapse;
}
th,td {
padding: 5px;
}
</style>
<body>
<form id="form1">
<select name="Artist">
<option value="Artist"> Choose an Artist </option>
<option value="1"> Bob Dylan </option>
<option value="2">Bonnie Tyler </option>
<option value="3"> Dolly Parton </option>
</select>
<select name="Title">
<option value="-Title"> -Choose the title </option>
<option value="a"> Empire Burlesque </option>
<option value="b"> Hide your heart </option>
<option value="c"> Greatest Hits </option>
</select>
<button type="button" onclick="loadDoc()">Display</button>
<br><br>
<table id="demo"></table>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open("GET", "cd_catalog.xml", true);
xhttp.send();
}
function myFunction(xml) {
var i;
var xmlDoc = xml.responseXML;
var table="<tr><th>Artist</th><th>Title</th><th>Country</th><th>Company</th><th>Price</th>Year</th></tr>";
var x = xmlDoc.getElementsByTagName("CD");
for (i = 0; i <x.length; i++) {
table += "<tr><td>" +
x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue +
"</td><td>" + x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
"</td><td>" + x[i].getElementsByTagName("COUNTRY")[0].childNodes[0].nodeValue +
"</td><td>" + x[i].getElementsByTagName("COMPANY")[0].childNodes[0].nodeValue +
"</td><td>" +
x[i].getElementsByTagName("PRICE")[0].childNodes[0].nodeValue +
"</td></tr>";
}
document.getElementById("demo").innerHTML = table;
}
</script>
</body>
</html><CATALOG>
<CD>
<TITLE>Empire Burlesque</TITLE>
<ARTIST>Bob Dylan</ARTIST>
<COUNTRY>USA</COUNTRY>
<COMPANY>Columbia</COMPANY>
<PRICE>10.90</PRICE>
<YEAR>1985</YEAR>
</CD>
<CD>
<TITLE>Hide your heart</TITLE>
<ARTIST>Bonnie Tyler</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>CBS Records</COMPANY>
<PRICE>9.90</PRICE>
<YEAR>1988</YEAR>
</CD>
<CD>
<TITLE>Greatest Hits</TITLE>
<ARTIST>Dolly Parton</ARTIST>
<COUNTRY>USA</COUNTRY>
<COMPANY>RCA</COMPANY>
<PRICE>9.90</PRICE>
<YEAR>1982</YEAR>
</CD>
<CD>
<TITLE>Still got the blues</TITLE>
<ARTIST>Gary Moore</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>Virgin records</COMPANY>
<PRICE>10.20</PRICE>
<YEAR>1990</YEAR>
</CD>
<CD>
<TITLE>Eros</TITLE>
<ARTIST>Eros Ramazzotti</ARTIST>
<COUNTRY>EU</COUNTRY>
<COMPANY>BMG</COMPANY>
<PRICE>9.90</PRICE>
<YEAR>1997</YEAR>
</CD>
</CATALOG>最佳答案
- 没有算法可以将 xml 值与所选选项进行比较。
- 选择的选项具有无意义的值。
check my plunk example. http://embed.plnkr.co/qcNQWXa7fmZ4ry5nRIlz/
<!DOCTYPE html>
<html>
<head>
<style>
table,th,td {
border : 1px solid black;
border-collapse: collapse;
}
th,td {
padding: 5px;
}
</style>
</head>
<body>
<form id="form1">
<select name="Artist" id="cd_artist">
<option value="Artist"> Choose an Artist </option>
<option value="Bob Dylan">Bob Dylan</option>
<option value="Bonnie Tyler">Bonnie Tyler</option>
<option value="Dolly Parton">Dolly Parton</option>
</select>
<select name="Title" id="cd_title">
<option value="-Title"> -Choose the title </option>
<option value="Empire Burlesque">Empire Burlesque</option>
<option value="Hide your heart">Hide your heart</option>
<option value="Greatest Hits">Greatest Hits</option>
</select>
</form>
<button type="button" onclick="loadDoc()">Display</button>
<br><br>
<table id="demo"></table>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open("GET", "cd_catalog.xml", true);
xhttp.send();
}
function myFunction(xml) {
var artistObj = document.getElementById('cd_artist');
var titleObj = document.getElementById('cd_title');
var selectedArtist = artistObj.options[artistObj.selectedIndex].value;
var selectedTitle = titleObj.options[titleObj.selectedIndex].value;
var i;
var xmlDoc = xml.responseXML;
var tableHeader = "<tr><th>Artist</th><th>Title</th><th>Country</th><th>Company</th><th>Price</th><th>Year</th></tr>";
var tableBody = "";
var x = xmlDoc.getElementsByTagName("CD");
for (i = 0; i <x.length; i++) {
var xmlArtist = x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue;
var xmlTitle = x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue;
var xmlCountry = x[i].getElementsByTagName("COUNTRY")[0].childNodes[0].nodeValue;
var xmlCompany = x[i].getElementsByTagName("COMPANY")[0].childNodes[0].nodeValue;
var xmlPrice = x[i].getElementsByTagName("PRICE")[0].childNodes[0].nodeValue;
var xmlYear = x[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue;
if(selectedArtist == xmlArtist && selectedTitle == xmlTitle) {
tableBody = "<tr><td>" + xmlArtist + "</td><td>" + xmlTitle + "</td><td>" + xmlCountry +
"</td><td>" + xmlCompany + "</td><td>" + xmlPrice + "</td><td>" + xmlYear + "</td></tr>";
break;
} else {
tableBody = "<tr><td colspan='6' align='center'>Not Found</td></tr>"
}
}
document.getElementById("demo").innerHTML = tableHeader + tableBody;
}
</script>
</body>
</html>关于javascript - 如何显示用户从列表中选择的内容？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41434651/