从下拉控件中调用方法 [英] Calling a method from a dropdown control
问题描述
如果我在ASP.NET 2.0中运行以下代码，则会失败并显示对象
必需错误，我不明白为什么。
有人能告诉我为什么会失败吗？然后，如果我能得到一个
的答案，我实际上更愿意运行一个C＃方法而不是
a javascript one，并想知道如何设置它（但是
我也得到同样的错误）。
< select id =" cbCarriers" onchange =" javascript ：test（）;">
< option value =''241''> 3GP< / option>
< option value ='''441''> AAC< / option>
< option value =''1115''> AB1< / option>
< / select>
< script type =" javascript">
功能测试（）
{
alert（" this"）;
}
< / script>
If I run this code below in ASP.NET 2.0 it fails with an "Object
Required" error and I have no idea why.
Could someone tell me why this is failing? Then if I can get an
answer to that, I would actually prefer to run a C# method instead of
a javascript one and would like to figure out how to set that up (but
I get the same error doing that too).
<select id="cbCarriers" onchange="javascript: test();">
<option value=''241''>3GP</option>
<option value=''441''>AAC</option>
<option value=''1115''>AB1</option>
</select>
<script type="javascript">
function test()
{
alert("this");
}
</script>
推荐答案
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如果我在ASP.NET 2.0中运行以下代码，则会失败并显示Object
必需"错误，我不明白为什么。
If I run this code below in ASP.NET 2.0 it fails with an "Object
Required" error and I have no idea why.
如果你改变会发生什么
< select id =" cbCarriers" onchange =" javascript ：test（）;">
到
< select id = QUOT; cbCarriers" onchange =" test（）;">
并更改
< script type =" javascript">
到
< script type =" text / javascript">
-
Mark Rae
ASP.NET MVP
http ：//www.markrae.net
What happens if you change
<select id="cbCarriers" onchange="javascript: test();">
to
<select id="cbCarriers" onchange="test();">
and change
<script type="javascript">
to
<script type="text/javascript">
--
Mark Rae
ASP.NET MVP
http://www.markrae.net
要尝试的事情。
theres a javascript后的空格 ：
alert（''this''）;
i不记得双引号在javascript中做，但单打是
一般你想要的。双打可能试图将您的
对象引用转换为字符串。函数是javascript中的对象，
这是一个引用该对象的特殊变量。
在你的代码中执行它你想要的将autopostback设置为
true，然后进行选定的Index change事件。你不会在你的代码后面有一个javascript警告弹出窗口。
couple things to try.
theres a space after the javascript:
alert(''this'');
i dont remember what double quotes do in javascript, but singles are
generally what you want. doubles might be trying to convert your
object reference to a string. functions are objects in javascript,
and this is a special variable which references that object.
to do it in your code behind you''ll want to set the autopostback to
true and then make a selected Index changed event. you won''t be
having an javascript alert popup in your code behind though.
以为我发布了，但它的没有出现。
尝试这些：
似乎是javascript 之后的空格：并且在test（）之前;
alert（''blah''）;
不知道javascript中的双引号，但它可能正在尝试
to调用函数对象的tostring方法。函数是javascript中的
对象，这是对该函数对象的引用。
我不记得双引号行为了。
用单引号和非保留字试试。
thought i posted, but its not showing up.
try these:
seems to be a space after javascript: and before test();
alert(''blah'');
dont know what double quotes do in javascript, but it could be trying
to call the tostring method of your function object. functions are
objects in javascript, this is a reference to that functions object.
I don''t remember double quote behavior though.
try it with single quotes, and with a non reserved word.
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