在YUI3中为什么Y.one返回null？
我有一个经过 XHTML 1.0 Strict 验证的网页。我正在使用 YUI3，并且正在使用基于种子文件的实例化。在我的 javascript 代码中的几个地方，我正在做类似的事情：
YUI().use("node", function(Y){
var node = Y.one("#my_element_id");
});
它在几乎所有情况下都运行良好，跨平台，跨浏览器等。不过我昨天测试的时候发现有一次不行。这对我来说毫无意义，我试图抓住的元素是：
<form id="component_form" method="post" action="<?php echo $_SERVER["PHP_SELF"];?>">
...
</form>
我确信它是格式良好的标记，所以这不是问题。如果我这样做：
YUI().use("node", function(Y){
var node1 = Y.one("#component_form");
var node2 = document.getElementById("component_form");
var node3 = Y.one(document.getElementById("component_form"));
});
node1为null，node2是我要查找的元素，node3也是。
有人有类似的经历吗，或者知道这是YUI3的bug还是什么？
这是一个完整的标记示例：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8"/>
<!-- metadata -->
<title>Inventory Management System</title>
<script type="text/javascript" src="http://yui.yahooapis.com/3.1.1/build/yui/yui-min.js"></script>
<script src="./util.js" type="text/javascript"></script>
<style type="text/css">
td{
vertical-align:text-top;
}
legend{
border: 2px #D4D0C8 groove;
padding: 2px;
font-weight: bolder;
}
fieldset{
border: 2px #D4D0C8 groove;
padding-bottom: 12px;
padding-left: 10px;
padding-right: 10px;
}
label{
font-weight: bold;
}
#err_container{
color: red;
display: none;
visibility: hidden;
margin: 10px;
}
#status_container{
color: green;
display: none;
visibility: hidden;
margin: 10px;
}
</style>
</head>
<body>
<div id="canvas">
<form id="st_frm" method="post" action="" style="display:none; visibility: hidden;">
<fieldset style="border:none; margin:0; padding:0;">
<input type="hidden" name="state" id="st" value=""/>
</fieldset>
</form>
<div id="navbar">
<a href="#" onclick="goToState(0); return false;">home</a>
| components | <a href="#" onclick="goToState(2); return false;">products</a>
</div>
<h1 id="main_h1">
Update Component
</h1>
<form id="component_form" method="post" action="/inventory/index.php">
<fieldset>
<legend id="component_form_legend">Component Information</legend>
<input type="hidden" id="component_form_id" name="id" value="8"/>
<input type="hidden" name="state" value="1"/>
<table>
<tr>
<td><label for="manufacturer_name_id">Manufacturer:</label></td>
<td><input type="text" id="manufacturer_name_id" name="manufacturer_name" value="Vishay"/></td>
</tr>
<tr>
<td><label for="manufacturer_part_number_id">Part Number:</label></td>
<td><input type="text" id="manufacturer_part_number_id" name="manufacturer_part_number" value="1123114123"/></td>
</tr>
<tr>
<td><label for="ct_id">Component Type:</label></td>
<td>
<select id="ct_id" name="component_type">
<option value="0">New Type</option>
<option value="5" >sfkd</option>
<option value="6" >qwrqew</option>
<option value="7" selected="selected" >Resistor</option>
</select>
<input id="nct_id" type="text" name="new_component_type" size="10" style="visibility:hidden; display: none;" />
</td>
</tr>
<tr>
<td><label for="description_id">Description:</label></td>
<td>
<textarea id="description_id" name="description" rows="3" cols="25">limits the flow of current...</textarea>
</td>
</tr>
<tr>
<td> </td>
<td>
<input id="component_form_submit_button" type="button" value="Update Component"/>
<span id="component_form_hide_when_new" >
<input id="component_form_delete_button" type="button" value="Delete Component"/>
<input id="component_form_new_button" type="button" value="New Component"/>
</span>
<input id="component_form_delete" name="delete" type="hidden" value="0"/>
</td>
</tr>
<tr>
<td colspan="2">
<div id="error_container"> </div>
<div id="status_container"> </div>
</td>
</tr>
</table>
</fieldset>
</form>
<ul id="component_form_list">
<li>
<a href="#" onclick="setNodeValue('component_form_id', 8); submitForm('component_form'); return false;">Vishay 1123114123</a>
</li>
</ul>
</div>
</body>
</html>
编辑 IE 8 在 var s = ... 行崩溃，因为 frm 为 null。
function submitForm(frmId){
YUI().use("node", function(Y){
var frm = Y.one("#" + frmId);
var s = typeof frm.submit;
if(s === 'function'){
frm.submit();
}
});
}
但是....
function submitForm(frmId){
YUI().use("node", function(Y){
var frm = Y.one(document.getElementById(frmId));
var s = typeof frm.submit;
if(s === 'function'){
frm.submit();
}
});
}
适用于两者...
I've got a webpage that validates as XHTML 1.0 Strict. I'm using YUI3 and I'm using the seed-file-based instantiation. In several places in my javascript code, I'm doing something like:
YUI().use("node", function(Y){
var node = Y.one("#my_element_id");
});
It works great, cross-platform, cross-browser, etc. in almost every case. However, I was testing yesterday, and I came across one time it didn't work. It made no sense to me, the element I was trying to grab was:
<form id="component_form" method="post" action="<?php echo $_SERVER["PHP_SELF"];?>">
...
</form>
I know for sure it is well-formed markup, so that's not the issue. If I do:
YUI().use("node", function(Y){
var node1 = Y.one("#component_form");
var node2 = document.getElementById("component_form");
var node3 = Y.one(document.getElementById("component_form"));
});
node1 is null, and node2 is the element I was looking for, and so is node3.
Anyone have a similar experience, or know if this is a YUI3 bug, or what?
Here is a full markup example:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8"/>
<!-- metadata -->
<title>Inventory Management System</title>
<script type="text/javascript" src="http://yui.yahooapis.com/3.1.1/build/yui/yui-min.js"></script>
<script src="./util.js" type="text/javascript"></script>
<style type="text/css">
td{
vertical-align:text-top;
}
legend{
border: 2px #D4D0C8 groove;
padding: 2px;
font-weight: bolder;
}
fieldset{
border: 2px #D4D0C8 groove;
padding-bottom: 12px;
padding-left: 10px;
padding-right: 10px;
}
label{
font-weight: bold;
}
#err_container{
color: red;
display: none;
visibility: hidden;
margin: 10px;
}
#status_container{
color: green;
display: none;
visibility: hidden;
margin: 10px;
}
</style>
</head>
<body>
<div id="canvas">
<form id="st_frm" method="post" action="" style="display:none; visibility: hidden;">
<fieldset style="border:none; margin:0; padding:0;">
<input type="hidden" name="state" id="st" value=""/>
</fieldset>
</form>
<div id="navbar">
<a href="#" onclick="goToState(0); return false;">home</a>
| components | <a href="#" onclick="goToState(2); return false;">products</a>
</div>
<h1 id="main_h1">
Update Component
</h1>
<form id="component_form" method="post" action="/inventory/index.php">
<fieldset>
<legend id="component_form_legend">Component Information</legend>
<input type="hidden" id="component_form_id" name="id" value="8"/>
<input type="hidden" name="state" value="1"/>
<table>
<tr>
<td><label for="manufacturer_name_id">Manufacturer:</label></td>
<td><input type="text" id="manufacturer_name_id" name="manufacturer_name" value="Vishay"/></td>
</tr>
<tr>
<td><label for="manufacturer_part_number_id">Part Number:</label></td>
<td><input type="text" id="manufacturer_part_number_id" name="manufacturer_part_number" value="1123114123"/></td>
</tr>
<tr>
<td><label for="ct_id">Component Type:</label></td>
<td>
<select id="ct_id" name="component_type">
<option value="0">New Type</option>
<option value="5" >sfkd</option>
<option value="6" >qwrqew</option>
<option value="7" selected="selected" >Resistor</option>
</select>
<input id="nct_id" type="text" name="new_component_type" size="10" style="visibility:hidden; display: none;" />
</td>
</tr>
<tr>
<td><label for="description_id">Description:</label></td>
<td>
<textarea id="description_id" name="description" rows="3" cols="25">limits the flow of current...</textarea>
</td>
</tr>
<tr>
<td> </td>
<td>
<input id="component_form_submit_button" type="button" value="Update Component"/>
<span id="component_form_hide_when_new" >
<input id="component_form_delete_button" type="button" value="Delete Component"/>
<input id="component_form_new_button" type="button" value="New Component"/>
</span>
<input id="component_form_delete" name="delete" type="hidden" value="0"/>
</td>
</tr>
<tr>
<td colspan="2">
<div id="error_container"> </div>
<div id="status_container"> </div>
</td>
</tr>
</table>
</fieldset>
</form>
<ul id="component_form_list">
<li>
<a href="#" onclick="setNodeValue('component_form_id', 8); submitForm('component_form'); return false;">Vishay 1123114123</a>
</li>
</ul>
</div>
</body>
</html>
EDIT
IE 8 crashes on the var s = ... line because frm is null.
function submitForm(frmId){
YUI().use("node", function(Y){
var frm = Y.one("#" + frmId);
var s = typeof frm.submit;
if(s === 'function'){
frm.submit();
}
});
}
but....
function submitForm(frmId){
YUI().use("node", function(Y){
var frm = Y.one(document.getElementById(frmId));
var s = typeof frm.submit;
if(s === 'function'){
frm.submit();
}
});
}
works in both...
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
你错过了一个双引号吗？
...
Did you miss one double quote?
...