触发手风琴可以通过自定义的 data-toggle 属性来触发。其中data-toggle值设置为 collapse,data-target="#折叠区标识符"。
第一步,设计一个面板组合,里面有三个折叠区:
<div class="panel-group" id="myAccordion"> <div class="panel panel-accordion panel-default"></div> <div class="panel panel-accordion panel-default"></div> <div class="panel panel-accordion panel-default"></div></div>
第二步:给面板添加内容,每个面板包括两个部分,第一个是面板标题 panel-heading,并且在这里面添加标题 panel-title。第二个部分是面板内容,也就是折叠区,使用 panel-collapse 样式。
<div class="panel panel-accordion panel-default"> <div class="panel-heading"> <h4 id="标题一">标题一</h4> </div> <div class="panel-collapse"> <div class="panel-body">折叠区内容...</div> </div></div>
第三步,为了把标题和内容区捆绑在一起,可以通过锚链接的方法,把标题区域和面板区连在一起:
<div class="panel-group" id="myAccordion"> <div class="panel panel-accordion panel-default"> <div class="panel-heading"> <h4 id="a-href-panel-标题一-a"><a href="#panel1">标题一</a></h4> </div> <div class="panel-collapse" id="panel1"> <div class="panel-body">折叠区内容...</div> </div> </div> <div class="panel panel-accordion panel-default"> <div class="panel-heading"> <h4 id="a-href-panel-标题二-a"><a href="#panel2">标题二</a></h4> </div> <div class="panel-collapse" id="panel2"> <div class="panel-body">折叠区内容...</div> </div> </div> ......</div>
第四步,控制面板内容区是否可视。在Bootstrap框架中,如果你想让内容区域不可视,只需要在 panel-collapse 样式上添加 collapse
每个面板的内容区都被隐藏起来了,变成不可视,但有时候希望默认第一个面板内容是可视的,需要怎么办?其实Bootstrap作者早就为大家做了这方面的考虑,你只需要在collapse基础上再追加 in 样式.
<div class="panel panel-accordion panel-default"> <div class="panel-heading"> <h4 id="a-href-panel-标题一-a"><a href="#panel1">标题一</a></h4> </div> <div class="panel-collapse collapse" id="panel1"> <div class="panel-body">折叠区内容...</div> </div></div>
第五步,激活手风琴交互行为。要完成交互行为,需要在标题链接中自定义两个属性,一个是data-toggle,并且取值为collapse;另一个是data-target,取值为各个面板内容区的标识符,比如说ID,在这个例子分别是#panel1、#panel2和#panel3
div class="panel panel-accordion panel-default"> <div class="panel-heading"> <h4 id="a-href-panel-data-toggle-collapse-data-target-panel-标题一-a"><a href="#panel1" data-toggle="collapse" data-target="#panel1">标题一</a></h4> </div> <div class="panel-collapse collapse in" id="panel1"> <div class="panel-body">折叠区内容...</div> </div></div>
注意:在这个案例中不加入data-target="#panel1"也可以,因为前面已经有了href="#panel1",但如是button按钮作为触发器就必须使用data-target="#panel1"语句了。
第六步,定义data-parent属性,实现点击一个其中一个元素时,关闭所有的折叠区,再打开所单击的区域(如果所单击区域是展示的,则会关闭)。这个data-parent取值与手风琴面板容器的标识符相匹配,比如这个例子是指 #myAccordion:
<div class="panel-group" id="myAccordion"> <div class="panel panel-accordion panel-default"> <div class="panel-heading"> <h4 id="a-href-panel-data-toggle-collapse-data-target-panel-data-parent-myAccordion-标题一-a"> <a href="#panel1" data-toggle="collapse" data-target="#panel1" data-parent="#myAccordion">标题一</a> </h4> </div>...
七 . 完整代码
<div class="panel-group" id="accordion"> <div class="panel panel-default"> <div class="panel-heading"> <h4 id="a-data-toggle-collapse-data-parent-accordion-href-collapseOne-标题一-a"><a data-toggle="collapse" data-parent="#accordion" href="#collapseOne">标题一</a></h4> </div> <div id="collapseOne" class="panel-collapse collapse in"> <div class="panel-body">标题一对应的内容</div> </div> </div> <div class="panel panel-default"> <div class="panel-heading"> <h4 id="a-data-toggle-collapse-data-parent-accordion-href-collapseTwo-标题二-a"><a data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">标题二</a></h4> </div> <div id="collapseTwo" class="panel-collapse collapse"> <div class="panel-body">标题二对应的内容</div> </div> </div> <div class="panel panel-default"> <div class="panel-heading"> <h4 id="a-data-toggle-collapse-data-parent-accordion-href-collapseThree-标题三-a"><a data-toggle="collapse"data-parent="#accordion"href="#collapseThree">标题三</a></h4> </div> <div id="collapseThree" class="panel-collapse collapse"> <div class="panel-body">标题三对应的内容</div> </div> </div></div>

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

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The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

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HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.


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