我想立即加载一个页面，然后加载数据以填充 select2 框。使用 Knockout，我最终没有收到任何错误，但在我的 select2 select 框中看不到任何项目。从服务器同步加载有效，但非常慢(因为获取 app_names)。我到目前为止:
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Admin suite</title>
<!-- Load javascript libraries -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.4/css/bootstrap.css" rel="stylesheet">
<!-- best interactive input box -->
<link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.min.css" rel="stylesheet" />
<script type="text/javascript" src="//cdn.jsdelivr.net/momentjs/latest/moment.min.js"></script>
<script type="text/javascript" src="//cdn.jsdelivr.net/bootstrap.daterangepicker/2/daterangepicker.js"></script>
<link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/bootstrap.daterangepicker/2/daterangepicker.css" />
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.1/knockout-min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
<!-- semantic -->
<!-- <link href="https://cdnjs.com/libraries/semantic-ui" rel="stylesheet"/> -->
<style>
.center {
float: none;
margin-left: auto;
margin-right: auto;
}
#centered {
width: 50%;
margin: 0 auto;
margin-top: 100
}
#middleman-datepicker {
cursor: pointer;
}
.column { float: left; padding: 5px 10px; }
.row { overflow: hidden; }
label {
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
}
input[type=radio],
input[type=checkbox] {
-webkit-box-flex: 0;
-webkit-flex: none;
-ms-flex: none;
flex: none;
margin-right: 10px;
}
.btn-primary,
.btn-primary:active,
.btn-primary:visited,
.btn-primary:focus {
background-color: #f49e42;
border-color: #8064A2;
}
.btn-primary:focus {
background-color: #f49542;
}
.btn-primary:hover {
background-color: #f48c42;
}
</style>
<meta id="my-data"
data-app-names="["cart", "catalog", "common-ui", "content", "ContentServices", "cyc", "deliverFromStore", "fbr", "fbt", "irg", "localization", "mylist-domain-service", "mylist-service", "mylist-ui", "nlpplus-service", "nlpservices", "orangegraph", "passbookService", "pricing", "promotion", "recommendations", "registry", "relatedsearch", "review_service", "sbotd-svcs", "SearchNavServices", "shipping", "SpecialBuy", "store-search", "storefinder", "typeahead2", "vectorsearch", "wayfinder"]">
<style>
.deactivate-services-box,
.delete-services-box {
width: 400px;
}
.clear-button {
margin-left: 10px;
}
</style>
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle Navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">SLO admin suite</a>
</div>
<a data-toggle="dropdown" class="dropdown-toggle" href="#">
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li class="dropdown">
Navigate
<span class="caret"></span>
<ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
<li class="dropdown-header"><a href="/">Middleman backfill</a></li>
<li class="dropdown-header"><a href="/healthchecks">Healthcheck statuses</a></li>
<li class="dropdown-header"><a href="/delete-services">Delete/deactivate services</a></li>
</ul></li>
</ul>
</div></a>
</div>
</nav>
<script type="text/javascript">
</script>
<div style="padding-top: 90px; float: left;" class="container">
<div >
<div class="">
<!-- https://select2.github.io/examples.html -->
<meta id="my-data"
data-app-names="["cart", "catalog", "common-ui", "content", "ContentServices", "cyc", "deliverFromStore", "fbr", "fbt", "irg", "localization", "mylist-domain-service", "mylist-service", "mylist-ui", "nlpplus-service", "nlpservices", "orangegraph", "passbookService", "pricing", "promotion", "recommendations", "registry", "relatedsearch", "review_service", "sbotd-svcs", "SearchNavServices", "shipping", "SpecialBuy", "store-search", "storefinder", "typeahead2", "vectorsearch", "wayfinder"]">
<style>
.deactivate-services-box,
.delete-services-box {
width: 400px;
}
.clear-button {
margin-left: 10px;
}
</style>
<body>
<div id="centered">
<span data-bind="visible: currently_running_ajax">
<h4>Pretending to run deactivation/deletion for 3 secs...</h4>
<p><img src="/static/img/loader.gif"/></p>
</span>
<div id="ajax-return-error-message" style="position:fixed; top:10%; right:45%; color: red; z-index: 999; display: none;"></div>
<h2>Deactivate services</h2>
<select class="deactivate-services-box" multiple="multiple" data-bind="foreach: app_names">
<option data-bind="value: $data, text: $data"></option>
</select>
<button id="deactivate-clear-all-button" class="clear-button">Clear all</button>
<h2>Permanently delete services</h2>
<select class="delete-services-box" multiple="multiple" data-bind="foreach: app_names">
<option data-bind="value: $data, text: $data"></option>
</select>
<button id="delete-clear-all-button" class="clear-button">Clear all</button>
<br><br>
<p id="empty-set-error-message" style="color: red; display: none;">Please make a selection</p>
<button id="submit-button" data-bind="click: submit_deactivation_and_or_deletion" class="btn-primary btn-lg" style="margin-left: 20px; ">Submit</button>
<button id="submit-button" data-bind="click: submit_fails_demo" class="btn-info btn-lg" style="margin-left: 20px; ">Submit will fail</button>
</div>
<script type="text/javascript">
var app_names = [];
console.log("app names 1");
// knockout
function DeleteServicesViewModel(){
var self = this;
self.app_names = app_names;
console.log("app names 2");
self.currently_running_ajax = ko.observable(false);
// var djangoData = $('#my-data').data();
// self.app_names = djangoData.appNames;
self.find_any_duplicates = function(list_one, list_two){
var duplicates = [];
for (i = 0; i < list_one.length; i++){
var item = list_one[i];
if (_.contains(list_two, item)){
duplicates.push(item);
}
}
return duplicates;
}
self.display_error_message = function(error){
setTimeout(
function() {
$("#ajax-return-error-message").text(error)
$("#ajax-return-error-message").slideDown(500, function(){
setTimeout(function(){
$("#ajax-return-error-message").slideUp(500);
}, 2600);
});
}, 300
);
}
self.submit_deactivation_and_or_deletion = function(){
var deactivate_values = $deactivate_services_box.val();
var deletion_values = $delete_services_box.val();
// alert(deactivate_values);
if (deactivate_values.length == 0 && deletion_values.length == 0){
$("#empty-set-error-message").slideDown(500, function(){
setTimeout(function(){
$("#empty-set-error-message").slideUp(500);
}, 1700);
});
return;
}
var duplicates = self.find_any_duplicates(deactivate_values, deletion_values);
if (duplicates.length){
alert("We cannot both delete and deactivate the same item. You have the following duplicates:\n\n%dups%\n\nPlease remove duplicates".replace("%dups%", duplicates));
return;
}
console.log('duplicates: ', duplicates);
self.currently_running_ajax(true);
$.ajax({
url: "/run-deactivation-and-deletion",
method: "POST",
headers: {
"Content-Type": "application/json"
},
data: ko.toJSON(
{ deactivate_list: deactivate_values, deletion_list: deletion_values }
),
success: function(data) {
console.log("worked");
$deactivate_services_box.val(null).trigger("change");
$delete_services_box.val(null).trigger("change");
},
error: function(xhr, textStatus, error) {
console.log("failed");
console.log(error);
self.currently_running_ajax(false);
self.display_error_message(error);
},
complete: function(){
self.currently_running_ajax(false);
}
});
}
// TODO: delete after demo
self.submit_fails_demo = function(){
var deactivate_values = $deactivate_services_box.val();
var deletion_values = $delete_services_box.val();
// alert(deactivate_values);
if (deactivate_values.length == 0 && deletion_values.length == 0){
$("#empty-set-error-message").slideDown(500, function(){
setTimeout(function(){
$("#empty-set-error-message").slideUp(500);
}, 1700);
});
return;
}
var duplicates = self.find_any_duplicates(deactivate_values, deletion_values);
if (duplicates.length){
alert("We cannot both delete and deactivate the same item. You have the following duplicates:\n\n%dups%\n\nPlease remove duplicates".replace("%dups%", duplicates));
return;
}
console.log('duplicates: ', duplicates);
self.currently_running_ajax(true);
$.ajax({
url: "/run-deactivation-and-deletion-fails-demo",
method: "POST",
headers: {
"Content-Type": "application/json"
},
data: ko.toJSON(
{ deactivate_list: deactivate_values, deletion_list: deletion_values }
),
// designed to fail for demo
error: function(xhr, textStatus, error) {
console.log("failed");
console.log(error);
self.currently_running_ajax(false);
self.display_error_message(error);
},
complete: function(){
self.currently_running_ajax(false);
}
});
}
}
$.getJSON("/app-names", function(data){
var app_names_json_string = data.app_names;
var app_names = JSON.parse(data.app_names);
console.log("app names 3");
ko.applyBindings(new DeleteServicesViewModel(app_names) );
var $deactivate_services_box = $(".deactivate-services-box");
var $delete_services_box = $(".delete-services-box");
$deactivate_services_box.select2();
$delete_services_box.select2();
$("#deactivate-clear-all-button").on("click", function () { $deactivate_services_box.val(null).trigger("change"); });
$("#delete-clear-all-button").on("click", function () { $delete_services_box.val(null).trigger("change"); });
});
// ko.applyBindings(new DeleteServicesViewModel() );
</script>
</body>
</div><br>
</div>
</div>
</body>
</html>
在 wait for ajax result to bind knockout model 中找到了帮助页面加载的灵感。
我想加载 html，我会做一个旋转的 gif，上面写着“正在加载”，进行 AJAX 调用以获取我的 app_names，当 app_names 到达时我将它们添加到 select2 框并初始化 select2。
最佳答案
这是一个工作 fiddle ，用于从 ajax 调用中对 jquery select2 进行数据绑定(bind)。 http://jsfiddle.net/LkqTU/33425/
不确定是否有更好的方法，但我将数据放在自定义绑定(bind)的更新部分而不是初始化，因为它是由 ajax 加载的，一开始可能不是他们的。
ko.bindingHandlers.select2 = {
init: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
ko.bindingHandlers.value.init(element,valueAccessor, allBindings);
$(element).select2({
})
},
update: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
var data = allBindings.get('select2Data');
var dataUnwrapped = ko.toJS(data);
$(element).select2({
data: dataUnwrapped
})
var value = valueAccessor();
ko.bindingHandlers.value.update(element,valueAccessor);
}
};
关于javascript - 在 Knockoutjs 中异步加载页面，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41840141/
exe应该在我打开页面时运行。异步进程需要运行。有什么方法可以在ruby中使用两个参数异步运行exe吗？我已经尝试过ruby命令-system()、exec()但它正在等待过程完成。我需要用参数启动exe，无需等待进程完成是否有任何rubygems会支持我的问题？ 最佳答案 您可以使用Process.spawn和Process.wait2:pid=Process.spawn'your.exe','--option'#Later...pid,status=Process.wait2pid您的程序将作为解释器的子进程执行。除
鉴于我有以下迁移:Sequel.migrationdoupdoalter_table:usersdoadd_column:is_admin,:default=>falseend#SequelrunsaDESCRIBEtablestatement,whenthemodelisloaded.#Atthispoint,itdoesnotknowthatusershaveais_adminflag.#Soitfails.@user=User.find(:email=>"admin@fancy-startup.example")@user.is_admin=true@user.save!ende
我收到这个错误:RuntimeError(自动加载常量Apps时检测到循环依赖当我使用多线程时。下面是我的代码。为什么会这样？我尝试多线程的原因是因为我正在编写一个HTML抓取应用程序。对Nokogiri::HTML(open())的调用是一个同步阻塞调用，需要1秒才能返回，我有100,000多个页面要访问，所以我试图运行多个线程来解决这个问题。有更好的方法吗？classToolsController0)app.website=array.join(',')putsapp.websiteelseapp.website="NONE"endapp.saveapps=Apps.order("
我一直致力于让我们的Rails2.3.8应用程序在JRuby下正确运行。一切正常，直到我启用config.threadsafe!以实现JRuby提供的并发性。这导致lib/中的模块和类不再自动加载。使用config.threadsafe!启用:$rubyscript/runner-eproduction'pSim::Sim200Provisioner'/Users/amchale/.rvm/gems/jruby-1.5.1@web-services/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:105:in`co
我们目前正在为ROR3.2开发自定义cms引擎。在这个过程中，我们希望成为我们的rails应用程序中的一等公民的几个类类型起源，这意味着它们应该驻留在应用程序的app文件夹下，它是插件。目前我们有以下类型:数据源数据类型查看我在app文件夹下创建了多个目录来保存这些:应用/数据源应用/数据类型应用/View更多类型将随之而来，我有点担心应用程序文件夹被这么多目录污染。因此，我想将它们移动到一个子目录/模块中，该子目录/模块包含cms定义的所有类型。所有类都应位于MyCms命名空间内，目录布局应如下所示:应用程序/my_cms/data_source应用程序/my_cms/data_ty
在我做的一些网络开发中，我有多个操作开始，比如对外部API的GET请求，我希望它们同时开始，因为一个不依赖另一个的结果。我希望事情能够在后台运行。我找到了concurrent-rubylibrary这似乎运作良好。通过将其混合到您创建的类中，该类的方法具有在后台线程上运行的异步版本。这导致我编写如下代码，其中FirstAsyncWorker和SecondAsyncWorker是我编写的类，我在其中混合了Concurrent::Async模块，并编写了一个名为“work”的方法来发送HTTP请求:defindexop1_result=FirstAsyncWorker.new.async.
require'mechanize'agent=Mechanize.newlogin=agent.get('http://www.schoolnet.ch/DE/HomeDE.htm')agent.clicklogin.link_withtext:/Login/然后我得到Mechanize::UnsupportedSchemeError。 最佳答案 Mechanize不支持javascript但您可以将搜索字段添加到表单并为其分配搜索词并使用mechanize提交表单form=page.forms.firstform.add_fie
我遇到了一个非常奇怪的问题，我很难解决。在我看来，我有一个与data-remote="true"和data-method="delete"的链接。当我单击该链接时，我可以看到对我的Rails服务器的DELETE请求。返回的JS代码会更改此链接的属性，其中包括href和data-method。再次单击此链接后，我的服务器收到了对新href的请求，但使用的是旧的data-method，即使我已将其从DELETE到POST(它仍然发送一个DELETE请求)。但是，如果我刷新页面，HTML与"new"HTML相同(随返回的JS发生变化)，但它实际上发送了正确的请求类型。这就是这个问题令我困惑的
我有可变数量的表格和可变数量的行，我想让它们一个接一个地显示，但如果表格不适合当前页面，请将其放在下一页，然后继续。我已将表格放入事务中，以便我可以回滚然后打印它(如果高度适合当前页面)，但我如何获得表格高度？我现在有这段代码pdf.transactiondopdf.table@data,:font_size=>12,:border_style=>:grid,:horizontal_padding=>10,:vertical_padding=>3,:border_width=>2,:position=>:left,:row_colors=>["FFFFFF","DDDDDD"]pdf.
据我们所知，Jekyll默认分页仅支持index.html，我想创建blog.html并在那里包含分页。有什么解决办法吗？ 最佳答案 如果您创建一个名为/blog的目录并在其中放置一个index.html文件，那么您可以向_config.yml表示paginate_path:"blog/page:num"。不是使用根文件夹中的默认index.html作为分页器模板，而是使用/blog/index.html。分页器将根据需要生成类似/blog/page2/和/blog/page3/的页面。这将使您到达yourwebsite.com/b