Question

如果未在用户的浏览器上启用JavaScript，是否可以替换带有HTML的JavaScript？

我知道我可以使用<noscript>this displays in place of javascript</noscript>

工作正常，但它仍然运行javascript。

理论上我想要这个：

如果启用了javascript 运行javascript

如果未启用javascript 不要运行javascript并提供替代方法

我正在使用这个jQuery插件：http://malsup.com/jquery/cycle/int2.html

当我在safari上禁用javascript时，它会显示所有三个项目，都在div中。该插件在每个项目中淡入淡出，但如果禁用它，则会连续显示所有这三个项目，而不会像启用javascript一样淡入淡出。

禁用javascript后，我想阻止它同时显示所有三个项目。我会告诉你看起来是什么样的，以及它在JavaScript被禁用时的作用。

已禁用的视图：http://i42.tinypic.com/212y1j6.png（请注意它们3彼此堆叠在一起） - 我希望阻止JavaScript被禁用

已启用视图：http://i39.tinypic.com/9gwu3d.png

以下是项目所在div的代码：

$(document).ready(function() {
    $('#featured-programs-left').cycle({ 
        fx:     'fade', 
        speed:  'slow',
        timeout: 15000,
        next:   '#next2',
        prev:   '#prev2' 
    });
});

<div id="featured-programs-left">

<div>
    <a href="http://site.com/academics/majors/emergency_medical_technician_-_paramedic/" title="Emergency Medical Technician - Paramedic"><img src="http://site.com/images/uploads/images/emt.jpg" alt="Emergency Medical Technician - Paramedic" /></a>
    <strong>Emergency Medical Technician - Paramedic</strong>
    <p>This unique A.A.S. degree program, a partnership between College and Faxton-St. Luke&#8217;s Healthcare provides the paramedic student the education necessary to function in an</p> 
    <p><a href="http://site.com/academics/majors/emergency_medical_technician_-_paramedic/" title="Learn more about Emergency Medical Technician - Paramedic">Learn more</a></p>
</div>

<div>
    <a href="http://site.com/academics/majors/travel_tourism_hospitality_events_management/" title="Travel &amp; Tourism: Hospitality &amp; Events Management"><img src="http://site.com/images/uploads/images/hospitality_event_planning.jpg" alt="Travel &amp; Tourism: Hospitality &amp; Events Management" /></a>
    <strong>Travel &amp; Tourism: Hospitality &amp; Events Management</strong>
    <p>This program prepares students for exciting careers in the travel and tourism industry and the hospitality and events planning field. Graduates are prepared to:<br</p> 
    <p><a href="http://site.com/academics/majors/travel_tourism_hospitality_events_management/" title="Learn more about Travel &amp; Tourism: Hospitality &amp; Events Management">Learn more</a></p>
</div>

<div>
    <a href="http://site.com/academics/majors/fashion_buying_merchandising/" title="Fashion Buying &amp; Merchandising"><img src="http://site.com/images/uploads/images/fashion_merchandising.jpg" alt="Fashion Buying &amp; Merchandising" /></a>
    <strong>Fashion Buying &amp; Merchandising</strong>
    <p>This program prepares graduates for careers throughout the Fashion Industry including positions in buying, fashion merchandising, retail and wholesale sales, retail</p> 
    <p><a href="http://site.com/academics/majors/fashion_buying_merchandising/" title="Learn more about Fashion Buying &amp; Merchandising">Learn more</a></p>
</div>

</div>

div的CSS

#featured-programs-left img,
#featured-programs-right img{
    xfloat:left;
    overflow:auto;
    xclear:left;
    xwidth:351px;
    xpadding:0 5px 5px 0;
    border:0;
}

#featured-programs-left,
#featured-programs-right {
    height:625px;
    float:left;
    overflow:auto;
    clear:left;
    clear:right;
    width:100%;
    xborder:2px solid red;
}

#featured-programs-left div,
#featured-programs-right div {
    xborder:1px solid purple;
    overflow:auto;
    clear:left;
    clear:right;
    width:352px;
    height:345px;
}

#featured-programs-left {
    float:left;
}

Answer 1

使用<noscript>的替代方法是在页面加载后立即使用JavaScript隐藏某个元素。如果禁用JavaScript，则元素将保持显示状态。如果启用了JavaScript，则将执行您的脚本并隐藏该元素。

window.onload = function () {
    document.getElementById("no_script").style.display = "none";
}

<div id="no_script">
You don't have JavaScript enabled.
</div>

更新

如果你想做相反的事情（在启用JavaScript时显示一些HTML），你总是可以使用各种方法将新元素注入到DOM树中。这是一个：

$(document).ready(function() {
    $('#container').html($('#content').html());
});

<div id="container"></div>
<script type="text/html" id="content">
    <div>Your <em>HTML</em> goes here</div>
</script>

向John Resig致敬<script type="text/html">，以便在HTML中不引人注意地隐藏HTML模板。浏览器显然不会执行或呈现非常规类型的<script>内容。

Answer 2

有点像Ates's solution，您可以使用Javascript更改启用它的用户的内容。例如，假设您有一个花哨的菜单，为Javascript用户提供超级简单的导航，但对非JS用户来说却毫无价值。在HTML中将display属性设置为'none'，然后使用JS启用它。在您的情况下，如果您有不希望为非JS用户显示的内容，则可以默认隐藏它。缺点是如果浏览器关闭JS和CSS，这将无法正常工作。如果您对此感到担心，可以使用JS插入内容。

<html>
<head>
  <script>
    $(document).ready(function() {
      $('.jsok').show();
    });
  </script>
  <style>
    .jsok { display: none; }
  </style>
 </head>
 <body>
   <div class="jsok"><!-- content for JS users here--></div>
   <div><!-- content for everyone here --></div>
   <noscript><!-- content for non-js users here --></noscript>
 </body>
 </html>

Answer 3

如果启用了脚本，它将运行脚本。如果你想要暂存＆lt; noscript＆gt;行为，在浏览器中禁用JavaScript并试用。

noscript标签，如果没有启用，我需要提供替代的HTML

3 个答案:

更新