在Jquery中选择所有空文本字段

问题描述

如何查找所有具有空值的文本字段?

How can I find all text fields that have an empty value?

$(":text[value='']")

出现JavaScript错误

gives a JavaScript error

我知道我可以做$(":text")，遍历并用$(this).val()==''返回所有字段

I know I can do $(":text"), iterate through and return all fields with $(this).val()==''

我正在寻找一种更清洁的方法并使用JQuery 1.3.1如果元素在页面加载时最初具有值，然后用户清除了它，则它必须起作用. ($("#elem").attr('value')给出了该位置的原始值，尽管.val()正常工作)

I am looking for a cleaner method and using JQuery 1.3.1It has to work if the element originally had a value when the page was loaded, and then the user cleared it. ($("#elem").attr('value') gives the original value in that place, though .val() works properly)

推荐答案

最新答案:升级到1.3.2

以下是我通过FireBug在 http://docs.jquery.com/Downloading_jQuery 上运行的各种测试

Latest Answer: Upgrade to 1.3.2

Here are various tests I ran via FireBug on http://docs.jquery.com/Downloading_jQuery

不同的jQuery版本在页面加载时使用特殊的lublessmonkey脚本进行了切换.

Different jQuery versions are switched in at page-load with special greasemonkey scripts.

>>> jQuery.prototype.jquery
"1.3.2"
>>> jQuery(":text[value='']")
[input#jq-primarySearch]
Unknown pseudo-class or pseudo-element 'text'.
>>> jQuery(":text[value=]").get()
[input#jq-primarySearch]

>>> jQuery.prototype.jquery
"1.3.1"
>>> jQuery(":text[value='']")
Syntax error, unrecognized expression: value='']
>>> jQuery(":text[value=]").get()
[input#jq-primarySearch]

>>> jQuery.prototype.jquery
"1.3"
>>> jQuery(":text[value='']");
Object length=1 prevObject=Object context=document
Unknown pseudo-class or pseudo-element 'text'.
[Break on this error] undefined
>>> jQuery(":text[value=]").get()
[input#jq-primarySearch]

请注意，1.3和1.3.2可以正确处理它(尽管Firefox发送错误)，但是它们仍然可以正确处理节点.

Note that 1.3 and 1.3.2 handle it properly ( albeit with Firefox sending an error ) but they still get the node right.

或者:您可以使用:text[value=]表示法，该表示法在我尝试过的任何地方都可以使用.只是有点怀疑而已.

Alternatively: you could use the :text[value=] notation, which appears to work everywhere I tried it. Its just a bit suspect thats all.

(忽略我以前的抱怨，他们都是胡扯，日子不好过-_-)

( Ignore my Previous rantings, they're all bollocks, not having a good day -_-)

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