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How TO - Filter Elements


Learn how to filter a DIV element based on it's class name.


Filter DIV Elements

BMW
Orange
Volvo
Red
Mustang
Blue
Cat
Dog
Melon
Kiwi
Banana
Lemon
Cow

Create Filterable DIV Elements

Step 1) Add HTML:

Example

<!-- Control buttons -->
<input type="radio" onclick="filterSelection('all')" name="category" checked> Show all
<input type="radio" onclick="filterSelection('cars')" name="category"> Cars
<input type="radio" onclick="filterSelection('animals')" name="category"> Animals
<input type="radio" onclick="filterSelection('fruits')" name="category"> Fruits
<input type="radio" onclick="filterSelection('colors')" name="category"> Colors

<!-- The filterable elements. Note that some have multiple class names (this can be used if they belong to multiple categories) -->
<div class="container">
  <div class="filterDiv cars">BMW</div>
  <div class="filterDiv colors fruits">Orange</div>
  <div class="filterDiv cars">Volvo</div>
  <div class="filterDiv colors">Red</div>
  <div class="filterDiv cars animals">Mustang</div>
  <div class="filterDiv colors">Blue</div>
  <div class="filterDiv animals">Cat</div>
  <div class="filterDiv animals">Dog</div>
  <div class="filterDiv fruits">Melon</div>
  <div class="filterDiv fruits animals">Kiwi</div>
  <div class="filterDiv fruits">Banana</div>
  <div class="filterDiv fruits">Lemon</div>
  <div class="filterDiv animals">Cow</div>
</div>


Step 2) Add CSS:

Example

.container {
    overflow: hidden;
}

.filterDiv {
    float: left;
    background-color: #2196F3;
    color: #ffffff;
    width: 100px;
    line-height: 100px;
    text-align: center;
    margin: 2px;
    display: none; /* Hidden by default */
}

/* The "show" class is added to the filtered elements */
.show {
    display: block;
}

Step 3) Add JavaScript:

Example

filterSelection("all")
function filterSelection(c) {
  var x, i;
  x = document.getElementsByClassName("filterDiv");
  if (c == "all") c = "";
  // Add the "show" class (display:block) to the filtered elements, and remove the "show" class from the elements that are not selected
  for (i = 0; i < x.length; i++) {
    w3RemoveClass(x[i], "show");
    if (x[i].className.indexOf(c) > -1) w3AddClass(x[i], "show");
  }
}

// Show filtered elements
function w3AddClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    if (arr1.indexOf(arr2[i]) == -1) {
      element.className += " " + arr2[i];
    }
  }
}

// Hide elements that are not selected
function w3RemoveClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    while (arr1.indexOf(arr2[i]) > -1) {
      arr1.splice(arr1.indexOf(arr2[i]), 1);
    }
  }
  element.className = arr1.join(" ");
}
Try it Yourself »