当用户名已存在时，使用jquery禁用输入字段

This is my jquery script to check for the duplicate username and throw out the error using ajax.I want to disable all other fields when i get duplication.That is below in the else statement under username is already available.I want to disable all other fields when this message appears.I have attached my form html below the jquery script.I already tried this ( $("#details").attr("disabled",true);) but not working.Any help would be appreciated. This is my jquery script to check for the dupli