小编Sok*_*iev的帖子

当我想创建Ruby on Rails项目时,我会收到以下消息.

/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support.rb:57
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/rails_generator.rb:31
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/bin/rails:15
    from /usr/bin/rails:19:in `load'
    from /usr/bin/rails:19

出了什么问题？我该如何解决？

目前我在设置焦点在extjs文本字段时遇到了问题.当表单显示时,我想将焦点设置为名字文本框,我尝试在函数focus()中使用build但仍然无法使其工作.我很高兴看到你的建议.

var simple = new Ext.FormPanel({

    labelWidth: 75, 
    url:'save-form.php',
    frame:true,
    title: 'Simple Form',
    bodyStyle:'padding:5px 5px 0',
    width: 350,
    defaults: {width: 230},
    defaultType: 'textfield',
    items: [{
            fieldLabel: 'First Name',
            name: 'first',
            id: 'first_name',
            allowBlank:false
        },{
            fieldLabel: 'Last Name',
            name: 'last'
        },{
            fieldLabel: 'Company',
            name: 'company'
        }, {
            fieldLabel: 'Email',
            name: 'email',
            vtype:'email'
        }, new Ext.form.TimeField({
            fieldLabel: 'Time',
            name: 'time',
            minValue: '8:00am',
            maxValue: '6:00pm'
        })
    ],

    buttons: [{
        text: 'Save'
    },{
        text: 'Cancel'
    }]
});

simple.render(document.body);

我开始学习如何编写sql语言,但我遇到了下面的问题:现在我在一个名为'data'的表中有一个数据

+------+-------+-------+-------+-------+
| id   | name  | type1 | type2 | type3 |
+------+-------+-------+-------+-------+
|    1 | Cake  | a     | b     | f     |
|    2 | Coca  | a     | d     | c     |
|    3 | Ice   | c     | b     | a     |
|    4 | Wine  | c     | e     | d     |
|    5 | Salad | c     | f     | a     |
|    6 | Water | d     | e     | f     | …