jQuery 水印输入和验证
在 HTML 页面上,我有一个输入框,当它为空时,上面有一个“水印”。 (例如:“在此处输入文字...”)。 有点像这样: http://digitalbush.com/projects/watermark-input-plugin/ - 但自定义编写。
问题是我不知道如何使用 jQuery 验证插件 (http: //docs.jquery.com/Plugins/Validation/),以便它将我的水印文本视为字段为空。
我在 jQuery 验证器中找不到一个选项来让我指定字段何时有效的自定义规则,有吗? 我可以找到允许我指定字段是否需要基于自定义逻辑进行验证的选项,但不能指定如何验证它。
我缺少什么?
On a HTML page I have an inputbox that has a 'watermark' on it when it is empty. (eg: "enter text here..."). Kind of like this: http://digitalbush.com/projects/watermark-input-plugin/ - but custom written.
The problem is that I can't figure out how to validate this field with the jQuery validation plugin (http://docs.jquery.com/Plugins/Validation/) so that it treats my watermark text as if the field was empty.
I can't find an option in the jQuery validator to let me specify a custom rule for when a field is valid, is there one? I could find options that allow me to specify whether a field needs to be validated based on custom logic, but not how it should be validated.
What am I missing?
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感谢 Kazar 为我提供了链接,我想出了以下解决方案(如果有人感兴趣):
Thanks to Kazar for providing me with the link, I came up with the following solution (if anyone is interested):
我正在使用 jQuery 的 Watermark 插件,但我的情况类似:
http://code. google.com/p/jquery-watermark/
它使用类名来显示水印。 (我不确定 DigitalBrush 版本是否使用类。)我已修改上述函数以使用 jQuery 的 hasClass() 函数来根据当前分配的类确定该字段是否被评估为“空”。
I'm using the Watermark plugin for jQuery, but my situation was similar:
http://code.google.com/p/jquery-watermark/
It uses a classname for the display of the watermark. (I'm not sure if the DigitalBrush version uses a class or not.) I've modified the above function to use jQuery's hasClass() function to determine whether or not the field is evaluated as "empty" based on currently assigned classes.
不确定验证插件如何工作,但这是一个可用的单独模块。
Not sure how the validation plugin works, but this is a separate module that is usable.
查看此博客文章:
http:// randomactsofcoding.blogspot.com/2008/10/starting-with-jquery-how-to-write.html
告诉您如何为字段构建自定义验证规则。
Check out this blog post:
http://randomactsofcoding.blogspot.com/2008/10/starting-with-jquery-how-to-write.html
Tells you how to construct a custom validation rule for a field.
当为每个测试框使用唯一的水印标签时(例如“输入名字”、“输入姓氏”...),您可以将脚本改进为:
这还会从脚本中删除硬编码文本。
When using unique watermark labels for each of your testboxes (For example 'enter firstname', 'enter last name'...), you could improve the script to:
This also removes the hardcoded text from your script.