JavaScript Treeview with Search

This JavaScript code snippet helps you to create treeview navigation with a search box. It gets JSON format data and renders a filterable treeview dynamically. Moreover, it displays base64-based icons for files and folders/directories.

How to Create JavaScript Treeview with Search

1. First of all, create the HTML structure for the treeview as follows:

<div  class="container">
   <div class='widget'>
      <input placeholder="filter..." id="filterInput" oninput="solve()" type="text"/>
      <div id="folders"></div>
   </div>
</div>

2. After that, style the treeview navigation using the following CSS styles.

body {
  margin-top: 20px;
  background-color: #ECEFF1;
}
 
.widget {
  padding: 18px;
  background-color: #fff;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.12), 0 1px 4px rgba(0, 0, 0, 0.24);
}
 
.widget > input { 
    display: block;
    width: 100%;
    min-height: 30px;
    margin-bottom: 20px;
    border: 0 none;
    border-bottom: 1px solid #ccc;
    outline: none;
  }
 
.folder-container {
  margin: 10px;
  padding: 0 20px;
  margin: 0;
}
 
.folder-wrapper {
  margin: 0;
  padding: 0;
 
  list-style-type: none;
}
 
.file-item,
.folder-item {
  margin-left: -16px;
  padding-left: 20px;
 
  list-style-type: none;
}
 
.file-item {
  background: transparent  url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAsUlEQVQ4T2NkgIKE2q4DMDZW+j+jAgPj//0LmssSkeUZEQZ0/1/QXArnoxuSUNPdwMDIEMDwn2HDgpbSBpg8aQYw/H/PwMCQwMDIMHFBc9kCkCGkGODAwMAAwiBd9TDXYhiQUNtdwPCfgR97ePy7uKClfENCLcK7RLsA2UC8BoADi4HhP44YObigpfTAsHfBgMcC3vwAzze0TAcUuKDrAMN/RlwJCNVcRoaPC5pLA0CCALOMnRHTr6OKAAAAAElFTkSuQmCC') no-repeat left center;
}
 
.folder-item {
  font-weight: bold;
  background: transparent  url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAA6UlEQVQ4T62TvQ3CMBCF31OgDxPACGwATAAjeAOgSKpECgoCiRTABmYDNgA2yAawAUpNwiGHH0GBlATcuPH3vbPvTPy4+COPXKCCpY30sgORPIU6dLtF5FTeYgWgA2KtQ1fnQj8amQ2C81fJVcZ65sZUfhTr0GmrYN5iZjWLpIqwC0oLVjah8hd7WPUBsvQIwC4ieD9zFwgDELuyMCCHuwDcAliWFgg2jwoQgxxWEDzeICfZqSDoPa9QHjZpVq1B5UUnEIXa91GhSKKnrm3mQEqXngNyMNNqBKYD/QqSsQ6d1X8+U4X0F3IDjRRPOikDqHUAAAAASUVORK5CYII=') no-repeat left center;
}

3. Finally, functionalize the treeview navigation with JavaScript.

const folders =
  {
    type: 'dir',
    name: 'app',
    children: [
      {
        type: 'file',
        name: 'index.html'
      },
      {
        type: 'dir',
        name: 'js',
        children: [
          {
            type: 'file',
            name: 'main.js'
          },
          {
            type: 'file',
            name: 'app.js'
          },
          {
            type: 'file',
            name: 'misc.js'
          },
          {
            type: 'dir',
            name: 'vendor',
            children: [
              {
                type: 'file',
                name: 'jquery.js'
              },
              {
                type: 'file',
                name: 'underscore.js'
              }
            ]
          }
        ]
      },
      {
        type: 'dir',
        name: 'css',
        children: [
          {
            type: 'file',
            name: 'reset.css'
          },
          {
            type: 'file',
            name: 'main.css'
          }
        ]
      }
    ]
  };
 
function displayJsonTree( data) {
  var htmlRetStr = "<ul class='folder-container'>";
  for (var key in data) {
    if (typeof(data[key])== 'object' && data[key] != null) {
      htmlRetStr += displayJsonTree( data[key] );
      htmlRetStr += '</ul></li>';
    } else if(data[key]=='dir'){
      htmlRetStr += "<li class='folder-item'>" + data["name"]+"</li><li class='folder-wrapper'>";
    }
    else if( key=='name' && data['type']!='dir' ){
      htmlRetStr += "<li class='file-item'>" + data['name']+"</li>";
    }
  }
  return( htmlRetStr );
}
function filterJson(data,string) {
  arr = [];
  for (var key in data)
    if (typeof(data[key]) == 'object' && data[key] != null) {
      if (data['name'].indexOf(string) <= -1) {
        for (var i = 0; i < data.children.length; i++) {
          arr=arr.concat(filterJson(data.children[i], string));
        }
        return arr;
      }
    }
    else {
        if (data['name'].indexOf(string) > -1) {
          arr = arr.concat(data);
          return arr;
        }
    }
}
document.getElementById("folders").innerHTML= displayJsonTree(folders);
function solve() {
  var toSearch=document.getElementById('filterInput').value;
  if(toSearch.length==0){
    document.getElementById("folders").innerHTML= displayJsonTree(folders);
  }
  else {
    var str = "Searching for: " + document.getElementById('filterInput').value + "\n";
    document.getElementById("folders").innerHTML = str + displayJsonTree(filterJson(folders, document.getElementById('filterInput').value));
  }
}

That’s all! hopefully, you have successfully integrated this JavaScript treeview navigation into your project. If you have any questions or facing any issues, feel free to comment below.

Asif Mughal

I code and create web elements for amazing people around the world. I like work with new people. New people new Experiences.
I truly enjoy what I’m doing, which makes me more passionate about web development and coding. I am always ready to do challenging tasks whether it is about creating a custom CMS from scratch or customizing an existing system.