当没有填写输入框时就会出现该异常。
没有图片上传、文件共享和视频聊天那些功能，仅仅有一个聊天窗口和一个文本输入框。
There’s no photo uploading, file sharing or video capabilities, just a text entry line and a chat widget.
没有图片上传、文件共享和视频聊天那些功能，仅仅有一个聊天窗口和一个文本输入框。
There's no photo uploading, file sharing or video capabilities, just a text entry line and a chat widget.
如果用户没有看到两个输入框，那么他们会开始扫描寻找一个叫做登录的链接。
If users don't see two boxes, they then start scanning for a link called Sign-in or Log-in.
相反的是，Yahoo将不同尺寸的文字输入框和下拉列表框混合排列，并且没有对齐。
On the other hand, Yahoo has quite a big mix of text boxes and drop down boxes with different sizes, and they are not aligned.
例如，编辑中的文本输入框可能想实现这个方法返回NO来保持自己的编辑状态(不过，这种情况目前还没有遇到过。)。
As an example, a text field in the middle of editing might want to implement this method to return NO to keep itself active during editing.
例如，编辑中的文本输入框可能想实现这个方法返回NO来保持自己的编辑状态(不过，这种情况目前还没有遇到过。)。
As an example, a text field in the middle of editing might want to implement this method to return NO to keep itself active during editing.
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