7.20. Bootstrap5 folding

<button data-bs-toggle="collapse" data-bs-target="#demo">foldbutton>

<div id="demo" class="collapse">
Here are some test contents...
div>
   
 Case analysis 
 
   .collapse   class is used to specify a collapse element (< div > in the instance); clicking the button switches between hiding and showing. 
 
 To control the hiding and display of content, you need to use the      or      add on the element   data-bs-toggle="collapse"   property.   data-target="#id"   the property is the corresponding collapsed content (< div id= “demo” >).  
 Note:      you can use the element   href   property instead of   data-bs-target   attributes:   
 
  7.20.2.  Example  ¶  
 
 
 
<a href="#demo" data-bs-toggle="collapse">folda>

<div id="demo" class="collapse">
Here are some test contents...
div>
   
 Collapsed content is hidden by default, and you can add   .show   class to make the content display by default: 
  
 
  7.20.3.  Example  ¶  
 
 
 
<div id="demo" class="collapse show">
Here are some test contents...
div>
   
 The following example shows a simple accordion by extending the card component. 
 
 Note: use th   data-bs-parent   property to ensure that all collapsed elements are under the specified parent element, so that other options are hidden when one collapse option is displayed. 
  
 
  7.20.4.  Example  ¶  
 
 
 
<div id="accordion">
    <div class="card">
        <div class="card-header">
            <a class="btn" data-bs-toggle="collapse" href="#collapseOne">
            Option 1
            a>
        div>
        <div id="collapseOne" class="collapse show" data-bs-parent="#accordion">
            <div class="card-body">
            #1 Content: Rookie Tutorial - Learning not only skills, but also dreams！！！
            div>
        div>
    div>
    <div class="card">
        <div class="card-header">
            <a class="collapsed btn" data-bs-toggle="collapse" href="#collapseTwo">
            Option 2
        a>
        div>
         <div id="collapseTwo" class="collapse" data-bs-parent="#accordion">
            <div class="card-body">
            #2 Content: Rookie Tutorial - Learning not only skills, but also dreams！！！
            div>
        div>
    div>
    <div class="card">
        <div class="card-header">
            <a class="collapsed btn" data-bs-toggle="collapse" href="#collapseThree">
            Option 3
            a>
        div>
        <div id="collapseThree" class="collapse" data-bs-parent="#accordion">
            <div class="card-body">
            #3 Content: Rookie Tutorial - Learning not only skills, but also dreams！！！
            div>
        div>
    div>
div>
     
                    
                
                

                    

                        

                            
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                            7.20. Bootstrap5 folding 
                        
                    
                
            
        
        

            

    
        

            

                

                    
                        
                        
                            
Principles and Applications of WebGIS 
                        
                        
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                                        4
                                    
                                
                            
                        
                    
                        

                            
                                
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WEB基础 
                        
                        
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Principles, Technologies, and Methods of Geographic Information Systems 
                        
                        
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 In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress. 
 
 
                        

                    
                
                

                    
                        

                            
                                
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                                        6
                                    
                                
                            
                        
                    
                        

                            
                                
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                                        7
                                    
                                
                            
                        
                    
                        

                            
                                
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                                        4
                                    
                                
                            
                        
                    
                        

                            
                                
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                                        8
                                    
                                
                            
                        
                    
                        

                            
                                
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                                        5
                                    
                                
                            
                        
                    
                        

                            
                                
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                                        6
                                    
                                
                            
                        
                    
                        

                            
                                
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                                        6
                                    
                                
                            
                        
                    
                        

                            
                                
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                                        5
                                    
                                
                            
                        
                    
                        

                            
                                
                                    13. Network Geographic Information System 
                                    
                                        4
                                    
                                
                            
                        
                    
                        

                            
                                
                                    14. Examples of Geographic Information System Application 
                                    
                                        8
                                    
                                
                            
                        
                    
                        

                            
                                
                                    15. Organization and Management of Geographic Information System Application Projects 
                                    
                                        10
                                    
                                
                            
                        
                    
                        

                            
                                
                                    16. Geographic Information system Software Engineering Technology 
                                    
                                        7
                                    
                                
                            
                        
                    
                        

                            
                                
                                    17. Geographic Information System Standards 
                                    
                                        3
                                    
                                
                            
                        
                    
                        

                            
                                
                                    18. Geographic Information System and Society 
                                    
                                        3
                                    
                                
                            
                        
                    
                        

                            
                                
                                    19. Earth Information Science and Digital Earth 
                                    
                                        4