Sometimes, checking a checkbox will trigger a cascading effect on other checkboxes

I have implemented 5 checkboxes in a vertical layout, each created using SVG and Polyline elements. The toggling functionality works fine when clicking on the label of each checkbox. However, sometimes clicking on the checkbox image toggles the wrong box!

.cbx {
  // CSS code for styling checkboxes
}
// More CSS code to style checkboxes

The HTML structure:

<div class="ax-cb-div">
  <input class="inp-cbx" id="1" type="checkbox" style="display: none;"/>
  <label for="1" class="cbx"><span>
    // Checkbox 1 content here
  </label>
</div>

// Repeat above structure for checkboxes 2, 3, and 4

After selecting checkboxes 1, 2, 3, and 4, if you try to uncheck checkbox 3 by clicking on it, checkbox 4 may get unchecked instead. Clicking again on checkbox 3 will uncheck it properly.

Visit this CodePen link for reference.

htmlcsscheckbox

Answer №1

By applying transform: scale(3.5) to the checkbox, it increases in size and ends up covering other checkboxes.

.inp-cbx:checked + .cbx span:first-child:before {
  transform: scale(1); // Adjusting the scale back to its original size instead of 3.5
  opacity: 0;
  transition: all 0.6s ease;
}


.cbx {
  margin: auto;
  margin-top: 2px;
  -webkit-user-select: none;
  user-select: none;
  cursor: pointer;
}
.cbx span {
  display: inline-block;
  vertical-align: middle;
  transform: translate3d(0, 0, 0);
}
.cbx span:first-child {
  position: relative;
  width: 18px;
  height: 18px;
  border-radius: 3px;
  transform: scale(1);
  vertical-align: middle;
  border: 1px solid #9098A9;
  transition: all 0.2s ease;
}
.cbx span:first-child svg {
  position: absolute;
  top: 3px;
  left: 2px;
  fill: none;
  stroke: #FFFFFF;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 16px;
  stroke-dashoffset: 16px;
  transition: all 0.3s ease;
  transition-delay: 0.1s;
  transform: translate3d(0, 0, 0);
}
.cbx span:first-child:before {
  content: "";
  width: 100%;
  height: 100%;
  background: #506EEC;
  display: block;
  transform: scale(0);
  opacity: 1;
  border-radius: 50%;
}
.cbx span:last-child {
  padding-left: 8px;
}
.cbx:hover span:first-child {
  border-color: #506EEC;
}

.inp-cbx:checked + .cbx span:first-child {
  background: #506EEC;
  border-color: #506EEC;
  animation: wave 0.4s ease;
}
.inp-cbx:checked + .cbx span:first-child svg {
  stroke-dashoffset: 0;
}
.inp-cbx:checked + .cbx span:first-child:before {
  transform: scale(1);
  opacity: 0;
  transition: all 0.6s ease;
}

@keyframes wave {
  50% {
    transform: scale(0.9);
  }
}
<div class="ax-cb-div">
  <input class="inp-cbx" id="1" type="checkbox" style="display: none;"/>
  <label for="1" class="cbx"><span>
    <svg width="12px" height="10px" viewbox="0 0 12 10">
      <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
    </svg></span><span>Checkbox number 1</span>
  </label>
</div>

<div class="ax-cb-div">
  <input class="inp-cbx" id="2" type="checkbox" style="display: none;"/>
  <label for="2" class="cbx"><span>
    <svg width="12px" height="10px" viewbox="0 0 12 10">
      <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
    </svg></span><span>Checkbox number 2</span>
  </label>
</div>

<div class="ax-cb-div">
  <input class="inp-cbx" id="3" type="checkbox" style="display: none;"/>
  <label for="3" class="cbx"><span>
    <svg width="12px" height="10px" viewbox="0 0 12 10">
      <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
    </svg></span><span>Checkbox number 3</span>
  </label>
</div>

<div class="ax-cb-div">
  <input class="inp-cbx" id="4" type="checkbox" style="display: none;"/>
  <label for="4" class="cbx"><span>
    <svg width="12px" height="10px" viewbox="0 0 12 10">
      <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
    </svg></span><span>Checkbox number 4</span>
  </label>
</div>

Answer №3

Make sure to utilize the value attribute.

<input id="1" value="example" ../>
<input id="3" value="sample" ../>

Check out MDN Web docs - Input

Answer №4

Adjust the transform property value to 1.5

.inp-cbx:checked + .cbx span:first-child:before {
   transform: scale(1.5);
   opacity: 0;
   transition: all 0.6s ease;
}

Answer №5

Include pointer-events: none; in the style of .cbx span:first-child:before. The issue is caused by the animation.

In the .cbx span:first-child:before section, we are transitioning the content:"" from scale(0) and opacity:1 to scale(3.5) and opacity:0 respectively. Essentially, we are only hiding that object with opacity, meaning the object will still be there and clickable. This is why it's necessary to add pointer-events:none to the .cbx span:first-child:before style.

To test this, simply select the 4th checkbox and examine it using the 

.inp-cbx:checked + . 
cbx span:first-child:before
style. Change the opacity from 0 to opacity:1. You will see something like what is shown below.

https://i.sstatic.net/GzeEN.png

In the image above, you can observe that the span:before of the 4th checkbox covers the 3rd checkbox and remains clickable. So, when you click on the 3rd checkbox, it actually registers as a click on the 4th one.

Explore the code snippet provided below:

.cbx {
  margin: auto;
  margin-top: 2px;
  -webkit-user-select: none;
  user-select: none;
  cursor: pointer;
}
.cbx span {
  display: inline-block;
  vertical-align: middle;
  transform: translate3d(0, 0, 0);
}
.cbx span:first-child {
  position: relative;
  width: 18px;
  height: 18px;
  border-radius: 3px;
  transform: scale(1);
  vertical-align: middle;
  border: 1px solid #9098A9;
  transition: all 0.2s ease;
}
.cbx span:first-child svg {
  position: absolute;
  top: 3px;
  left: 2px;
  fill: none;
  stroke: #FFFFFF;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 16px;
  stroke-dashoffset: 16px;
  transition: all 0.3s ease;
  transition-delay: 0.1s;
  transform: translate3d(0, 0, 0);
}
.cbx span:first-child:before {
  content: "";
  width: 100%;
  height: 100%;
  background: #506EEC;
  display: block;
  transform: scale(0);
  opacity: 1;
  border-radius: 50%;
  pointer-events:none;
}
.cbx span:last-child {
  padding-left: 8px;
}
.cbx:hover span:first-child {
  border-color: #506EEC;
}

.inp-cbx:checked + .cbx span:first-child {
  background: #506EEC;
  border-color: #506EEC;
  animation: wave 0.4s ease;
}
.inp-cbx:checked + .cbx span:first-child svg {
  stroke-dashoffset: 0;
}
.inp-cbx:checked + .cbx span:first-child:before {
  transform: scale(3.5);
  opacity: 0;
  transition: all 0.6s ease;
}

@keyframes wave {
  50% {
    transform: scale(0.9);
  }
}
<div class="ax-cb-div">
  <input class="inp-cbx" id="1" type="checkbox" style="display: none;"/>
  <label for="1" class="cbx"><span>
    <svg width="12px" height="10px" viewbox="0 0 12 10">
      <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
    </svg></span><span>Checkbox number 1</span>
  </label>
</div>

<div class="ax-cb-div">
  <input class="inp-cbx" id="2" type="checkbox" style="display: none;"/>
  <label for="2" class="cbx"><span>
    <svg width="12px" height="10px" viewbox="0 0 12 10">
      <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
    </svg></span><span>Checkbox number 2</span>
  </label>
</div>

<div class="ax-cb-div">
  <input class="inp-cbx" id="3" type="checkbox" style="display: none;"/>
  <label for="3" class="cbx"><span>
    <svg width="12px" height="10px" viewbox="0 0 12 10">
      <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
    </svg></span><span>Checkbox number 3</span>
  </label>
</div>

<div class="ax-cb-div">
  <input class="inp-cbx" id="4" type="checkbox" style="display: none;"/>
  <label for="4" class="cbx"><span>
    <svg width="12px" height="10px" viewbox="0 0 12 10">
      <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
    </svg></span><span>Checkbox number 4</span>
  </label>
</div>

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