12

在后台，我希望它重新加载并显示有多少未读消息。
我想要不刷新页面。我的意思是使用ajax。

如果我在菜单中有这个，我怎么能每 30 秒只刷新这个部分？

<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>

消息控制器.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/refresh_messages_count.js

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

});

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

消息控制器.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)}");
4

3 回答 3

26

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"
 })
}

然后您在控制器中执行如下操作：

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

然后你将编写一个名为的 js 文件refresh_part.js.haml（你可以用 erb 代替 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)}");

确保您在routes.rb.

于 2012-12-21T11:10:49.203 回答
3

仅供参考，refresh_part.js.erb 看起来像这样：

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

代替：

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

此外，我们可以使用“escape_javascript”的别名来简化这一点：

$("#part").html("<%= j(render 'partial', data: @data) %>");
于 2017-06-09T09:02:41.653 回答
0

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

于 2012-12-21T10:43:51.740 回答