jQuery 1.4.2:.is(":focus") 给出语法错误 [英] jQuery 1.4.2: .is(":focus") gives syntax error
问题描述
假设有一个只有一个输入的文档.我想要做的就是这么简单:
Assume there is a document with a single input. What I'm trying to do is as simple as this:
$("input").focus().is(":focus");
我希望上面的代码返回 true
.相反,firebug 会记录一个错误:
I would expect the above code to return true
. Instead, firebug logs an error:
Syntax error, unrecognized expression: Syntax error, unrecognized expression: focus
我在这里错过了什么?我假设与 is()
一起使用的语法与 $()
相同,或者我不能这样做?
What am I missing here? I assumed that the syntax used with is()
is identical to $()
, or I can't do that?
如果这是不可修复的,您建议如何检查焦点输入?
How would you recommend to check for a focused input if this is unfixable instead?
从 jquery 1.6 开始,:focus
选择器是 jquery 核心的一部分:http://api.jquery.com/focus-selector/
如果您需要,只需升级即可.
As of jquery 1.6, the :focus
selector is part of jquery core: http://api.jquery.com/focus-selector/
If you need it, just upgrade.
推荐答案
$("input").focus()
应该足够了.由于 :focus
不是选择器.
$("input").focus()
should suffice. As :focus
is not a selector.
$("input").focus(function () {
//do something
});
$("input:focus").runFunc();
我想 可能 工作.Cletus总结了这个问题嗯,我认为,值得一看.
$("input:focus").runFunc();
I suppose that might work. Cletus has summed up this problem well I think, its worth a look.
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