[英]JS works in one place but not another
我感到有些奇怪。 我正在修改其中包含js和html的html文件中的一些代码，直到我可以按需要运行它，然后将其复制并粘贴到链接到JS页面的php文件中。 麻烦的是，在php页面中，我得到了错误消息无法识别的表达式：select [name = gateHeight] option：selected。 如果有人能解释我搞砸了，我将不胜感激！ 这是带有JS和HTML的html文件：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title></title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#btnAdd').click(function() {
var num = $('.clonedInput').length; // how many "duplicatable" input fields we currently have
var newNum = new Number(num + 1); // the numeric ID of the new input field being added
// create the new element via clone(), and manipulate it's ID using newNum value
var newElem = $('#input' + num).clone().attr('id', 'input' + newNum);
// manipulate the name/id values of the input inside the new element
newElem.children($("select[name=gateHeight] option: selected")).attr('id', 'gateHeight' + newNum).attr('name', 'gateHeight' + newNum);
//newElem.children('input[type=text]:first').attr('id', 'name' + newNum).attr('name', 'name' + newNum);
newElem.children('input[type=checkbox]:first').attr('id', 'chk' + newNum).attr('name', 'chk' + newNum);
// insert the new element after the last "duplicatable" input field
$('#input' + num).after(newElem);
// enable the "remove" button
//$('#btnDel').attr('disabled','');
$('#btnDel').removeAttr('disabled');
// business rule: you can only add 5 names
if (newNum == 5)
$('#btnAdd').attr('disabled','disabled');
});
$('#btnDel').click(function() {
var num = $('.clonedInput').length; // how many "duplicatable" input fields we currently have
$('#input' + num).remove(); // remove the last element
// enable the "add" button
//$('#btnAdd').attr('disabled','');
$('#btnAdd').removeAttr('disabled');
// if only one element remains, disable the "remove" button
if (num-1 == 1)
$('#btnDel').attr('disabled','disabled');
});
$('#btnDel').attr('disabled','disabled');
});
</script>
</head>
<body>
<form id="myForm">
<div id="input1" style="margin-bottom:4px;" class="clonedInput">
<!-- <input type="text" name="name1" id="name1" /> -->
<select name="gateHeight" id="gateHeight">
<option value="select">Select Gate Height</option>
<option value="4fg">4 Ft. Gate</option>
<option value="6fg">6 Ft. Gate</option>
<option value="8fg">8 Ft. Gate</option>
</select>
Include Spring Pool Latch: <input type="checkbox" name="chk1" id="chk1" />
</div>
<div>
<input type="button" id="btnAdd" value="add another name" />
<input type="button" id="btnDel" value="remove name" />
</div>
</form>
</body>
这是另一个文件的JS和HTML：JS：
//Dynamic Gate Input Fields
$('#btnAdd').click(function() {
var num = $('.clonedInput').length; // how many "duplicatable" input fields we currently have
var newNum = new Number(num + 1); // the numeric ID of the new input field being added
// create the new element via clone(), and manipulate it's ID using newNum value
var newElem = $('#input' + num).clone().attr('id', 'input' + newNum);
// manipulate the name/id values of the input inside the new element
newElem.children($("select[name=gateHeight] option: selected")).attr('id', 'gateHeight' + newNum).attr('name', 'gateHeight' + newNum);
//newElem.children('input[type=text]:first').attr('id', 'name' + newNum).attr('name', 'name' + newNum);
newElem.children('input[type=checkbox]:first').attr('id', 'chk' + newNum).attr('name', 'chk' + newNum);
// insert the new element after the last "duplicatable" input field
$('#input' + num).after(newElem);
// enable the "remove" button
//$('#btnDel').attr('disabled','');
$('#btnDel').removeAttr('disabled');
// business rule: you can only add 5 names
if (newNum == 5)
$('#btnAdd').attr('disabled','disabled');
});
$('#btnDel').click(function() {
var num = $('.clonedInput').length; // how many "duplicatable" input fields we currently have
$('#input' + num).remove(); // remove the last element
// enable the "add" button
//$('#btnAdd').attr('disabled','');
$('#btnAdd').removeAttr('disabled');
// if only one element remains, disable the "remove" button
if (num-1 == 1)
$('#btnDel').attr('disabled','disabled');
});
$('#btnDel').attr('disabled','disabled');
HTML：
<div id="input1" style="margin-bottom:4px;" class="clonedInput">
<select name="gateHeight" id="gateHeight">
<option value="select">Select Gate Height</option>
<option value="4fg">4 Ft. Gate</option>
<option value="6fg">6 Ft. Gate</option>
<option value="8fg">8 Ft. Gate</option>
</select>
Include Spring Pool Latch: <input type="checkbox" name="chk1" id="chk1" />
</div>
<div>
<input type="button" id="btnAdd" value="Add Another Gate" />
<input type="button" id="btnDel" value="Remove Gate" />
</div>
您缺少文档就绪包装函数，因此在元素存在之前调用了代码，因此失败。
您需要去除option: selected的冒号后面的空格option: selected 。 只需将其更改为option:selected 。
试试看
$("select[name=gateHeight] option :selected")
:selected是正确的一个not : selected （没有空格）
要么
$("select[name=gateHeight] option").filter(":selected")
这会起作用
首先，您应该使用jquery的updated version ，例如jquery-1.9或更高版本。
其次，您应该使用newElem.children("select[name=gateHeight]")代替newElem.children($("select[name=gateHeight] option: selected"))
newElem.find("select[name='gateHeight']")
.attr({'id': 'gateHeight'+newNum, 'name': 'gateHeight' + newNum});// combine attr() using json
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