Toggle Switch with Loading State
For settings that save to a server: switching on shows a spinner in the knob over a pale track, then a check mark draws in and the track fills. The pending beat is timed here with transition-delay.
Also known as: loading toggle switch, async toggle switch css, toggle switch with spinner.
HTML
<label class="tgl-loading">
<input type="checkbox" role="switch" aria-label="Cloud sync">
<span class="tgl-loading-track" aria-hidden="true">
<span class="tgl-loading-knob">
<span class="tgl-loading-spinner"></span>
<svg class="tgl-loading-check" viewBox="0 0 24 24" fill="none" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><path d="M6.5 12.5l3.5 3.5 7.5-8"/></svg>
</span>
</span>
</label>CSS
.tgl-loading {
--c: var(--tgl-color, #3b82f6);
font-size: var(--tgl-size, 24px);
position: relative;
display: inline-block;
vertical-align: middle;
cursor: pointer;
-webkit-tap-highlight-color: transparent;
}
.tgl-loading input {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
margin: 0;
opacity: 0;
cursor: pointer;
z-index: 1;
}
.tgl-loading-track {
position: relative;
display: block;
width: 3.8em;
height: 2em;
border-radius: 1em;
background: color-mix(in srgb, currentColor 13%, transparent);
transition: background-color 0.3s ease;
}
.tgl-loading-track::before {
content: "";
position: absolute;
inset: 0;
border-radius: inherit;
background: var(--c);
opacity: 0;
transition: opacity 0.3s ease;
}
.tgl-loading-knob {
position: absolute;
top: 0.2em;
left: 0.2em;
display: grid;
place-items: center;
width: 1.6em;
height: 1.6em;
border-radius: 50%;
background: #fff;
box-shadow: 0 0.1em 0.3em rgb(0 0 0 / 0.22);
transition: transform 0.35s cubic-bezier(0.3, 0.7, 0.3, 1);
}
.tgl-loading-spinner,
.tgl-loading-check {
grid-area: 1 / 1;
width: 1em;
height: 1em;
}
.tgl-loading-spinner {
border: 0.14em solid color-mix(in srgb, var(--c) 22%, transparent);
border-top-color: var(--c);
border-radius: 50%;
opacity: 0;
}
.tgl-loading-check {
stroke: var(--c);
stroke-dasharray: 17;
stroke-dashoffset: 17;
transition: stroke-dashoffset 0.15s ease;
}
/* on: pale track and a spinner first, then the fill and the check */
.tgl-loading input:checked + .tgl-loading-track { background: color-mix(in srgb, var(--c) 28%, transparent); }
.tgl-loading input:checked + .tgl-loading-track::before {
opacity: 1;
transition-delay: 1.1s;
}
.tgl-loading input:checked + .tgl-loading-track .tgl-loading-knob { transform: translateX(1.8em); }
.tgl-loading input:checked + .tgl-loading-track .tgl-loading-spinner { animation: tgl-loading-spin 1.2s linear forwards; }
.tgl-loading input:checked + .tgl-loading-track .tgl-loading-check {
stroke-dashoffset: 0;
transition: stroke-dashoffset 0.3s ease 1.15s;
}
.tgl-loading input:focus-visible + .tgl-loading-track {
outline: 2px solid var(--c);
outline-offset: 2px;
}
@keyframes tgl-loading-spin {
0% { opacity: 0; transform: rotate(0deg); }
8%, 88% { opacity: 1; }
100% { opacity: 0; transform: rotate(720deg); }
}
@media (prefers-reduced-motion: reduce) {
.tgl-loading, .tgl-loading *, .tgl-loading::before, .tgl-loading::after, .tgl-loading *::before, .tgl-loading *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--tgl-coloron the element or a parent. Currently previewing#3b82f6. - Size: set
--tgl-size. Every other dimension is inem, so the whole thing scales together. Currently previewing24px. - Speed: change the duration on the
transitionoranimationshorthand. Staggered delays are relative, so they keep their rhythm. - Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.