由网友(二逼青年最无敌)分享简介：我使用的铁轨使用jQuery和Ajax检查用户名的可用性。我在用下面的jQuery插件验证的目的。I am using rails with jquery and ajax to check the availability of username. I am using the following plugin f...

我使用的铁轨使用jQuery和Ajax检查用户名的可用性。我在用     下面的jQuery插件验证的目的。

I am using rails with jquery and ajax to check the availability of username. I am using the following plugin for jquery validation purpose.

https://github.com/posabsolute/jQuery-Validation-Engine

在我的控制器中，我使用下面的方法来检查用户名的可用性。

In my controller i am using the following method to check the username availability.

def check_name
 name = params[:name]
 if name.strip == ""
  render :json => { :available => false } 
  return
 end
 user = User.find(:first, :conditions => [ "name = ?", name])
 if realm
  render :json =>  ["name", false , "This name is already taken"]
 else
  render :json =>  ["name", true , ""]
 end
end

这是写的方法，正确的方法是什么？我查了很多的用户名可用性     在这个论坛的帖子，但没有解决。

Is this the correct way to write the method? I checked many of the username availability posts in this forum, but nothing worked out.

推荐答案

我添加了答案。抱歉耽搁家伙。

I am adding the answer. Sorry for the delay guys.

信用第一插件：https://github.com/posabsolute/jQuery-Validation-Engine 。 在应用程序验证中使用的插件。

First credit to the plugin:https://github.com/posabsolute/jQuery-Validation-Engine . Used the plugin for validations in the application.

在视图中，我有

<%= f.username_field :username, :id => 'free-user', :placeholder=>'User Name', :class => "validate[required, ajax[ajaxUserCall]]", "data-prompt-position" => "topLeft:0,9"%>

在同样的观点，在Java脚本：

In the same view, in java script:

<script type="text/javascript">
 $(document).ready(function(){
  $("#free-user").bind("jqv.field.result", function(event, field, errorFound, prompText){
    if(errorFound){
        $(".continue").attr("disabled", false);  // .continue is a button
    } else{
        $(".continue").attr("disabled", true);
    }
  })
 });
</script>

在routes.rb中我有以下途径。

In routes.rb i have the following route.

match '/check-user' =>"users#check_user"  // creating route for ajax call

在jquery.validationEngine-en.js文件我有以下：

In jquery.validationEngine-en.js file i have following:

"ajaxUserCall": {
                "url": "/check-user",
                // you may want to pass extra data on the ajax call
                "alertText": "* This user is already taken",
                "alertTextLoad": "* Validating, please wait"
            },

在用户控制器，我有以下方法

In users controller, i have the following method

def check_user
  user = params[:fieldValue]
  user = User.where("username = ?", username).first
  if user.present?
    render :json =>  ["free-user", false , "This User is already taken"]
  else
    render :json =>  ["free-user", true , ""]
  end
end