Question

在后台，我希望它重新加载并显示有多少未读消息的数量我希望没有刷新页面。我的意思是使用ajax。

如果我在菜单中有这个，我怎么能每30秒刷新一次这个部分？

<li><%= link_to sanitize('<i class="icon-envelope"></i> ') + "received messages" + sanitize(' <span class="badge badge-info">'+current_user.mailbox.inbox(:read => false).count(:id, :distinct => true).to_s+'</span>'), messages_received_path  %></li>

messages_controller.rb

  def received
    if params[:search]
     @messages = current_user.mailbox.inbox.search_messages(@search).page(params[:page]).per(10)
    else
     @messages = current_user.mailbox.inbox.page(params[:page]).per(10)
    end 
     add_crumb 'Messages Received', messages_received_path

     @box = 'inbox'
     render :index
  end

更新： _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _

资产/ JavaScript的/ refresh_messages_count.js

$(document).ready(function () {
    // will call refreshPartial every 3 seconds
    setInterval(refreshPartial, 3000)

});

function refreshPartial() {
  $.ajax({
    url: "messages/refresh_part";
 })
}

messages_controller.rb

def refresh_part
    @message_count = current_user.mailbox.inbox(:read => false).count(:id, :distinct => true)

    # get whatever data you need to a variable named @data 
    respond_to do |format| 
        format.js {render :action=>"refresh_part.js"} 
    end

end

视图/布局/ _menu.html.erb

<span id="message_received_count"><%= render :partial => "layouts/message_received_count" %></span>

视图/布局/ _message_received_count.html.erb

<% if user_signed_in? && current_user.mailbox.inbox(:read => false).count(:id, :distinct => true) > 0 %>
 <li><%= link_to sanitize('<i class="icon-envelope"></i> ') + "Received" + sanitize(' <span class="badge badge-info">'+@message_count.to_s+'</span>'), messages_received_path  %></li>
<% else %>
 <li><%= link_to sanitize('<i class="icon-envelope"></i> ') + "Received", messages_received_path  %></li>
<% end %>

视图/消息/ refresh_part.js.erb

$('#message_received_count').html("#{escape_javascript(render 'layouts/messages_received_count', data: @message_count)}");

Answer 1

您将使用setInterval发送ajax请求：

$(document).ready(function () {
    // will call refreshPartial every 3 seconds
    setInterval(refreshPartial, 3000)

});

// calls action refreshing the partial
function refreshPartial() {
  $.ajax({
    url: "whatever_controller/refresh_part"
 })
}

然后你在这样的控制器中做一个动作：

def refresh_part
  # get whatever data you need to a variable named @data
  respond_to do |format|
    format.js
  end
end

然后你会写一个名为refresh_part.js.haml的js文件（你可能会错误而不是haml）。

refresh_part.js.haml看起来像这样：

$('#part_you_want_to_refresh').html("#{escape_javascript(render 'name_of_partial', data: @data)}");

确保在routes.rb。

中设置正确的路线

Answer 2

仅供参考，refresh_part.js.erb如下所示：

$("#part").html("<%= escape_javascript(render 'partial', data: @data) %>");

而不是：

$('#part').html("#{escape_javascript(render 'partial', data: @data)}");

另外，我们可以使用“escape_javascript”的别名来简化：

$("#part").html("<%= j(render 'partial', data: @data) %>");

Answer 3

是的，你可以

<html>
<head>
<script type="text/JavaScript">
<!--
function timedRefresh(timeoutPeriod) {
    setTimeout("location.reload(true);",timeoutPeriod);
}
//   -->
</script>
</head>
<body onload="JavaScript:timedRefresh(5000);">
<p>This page will refresh every 5 seconds. This is because we're using the 'onload' event to call our function. We are passing in the value '5000', which equals 5 seconds.</p>
<p>But hey, try not to annoy your users too much with unnecessary page refreshes every few seconds!</p>
</body>
</html>

来源：http://www.quackit.com/javascript/javascript_refresh_page.cfm

是否可以使用Ajax频繁刷新部分？

3 个答案: