I use pure css for star rating. How can I default rating value?

问题

The rating system works fine and does not use js at all. I store the rating in the database.

If I want to change the rating and retrieve the rating from the database, what changes to CSS I should make to show the stored rating?

For example, I rated something by 4-star before. When I click to the edit page, I can see it's rated by 4 stars and still I can change it to 1-star or 5-star.

.star-rating {
  font-size: 0;
  white-space: nowrap;
  display: inline-block;
  width: 150px;
  height: 30px;
  overflow: hidden;
  position: relative;
  background: url('data:image/svg+xml;base64,PHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkveGxpbmsiIHg9IjBweCIgeT0iMHB4IiB3aWR0aD0iMjBweCIgaGVpZ2h0PSIyMHB4IiB2aWV3Qm94PSIwIDAgMjAgMjAiIGVuYWJsZS1iYWNrZ3JvdW5kPSJuZXcgMCAwIDIwIDIwIiB4bWw6c3BhY2U9InByZXNlcnZlIj48cG9seWdvbiBmaWxsPSIjREREREREIiBwb2ludHM9IjEwLDAgMTMuMDksNi41ODMgMjAsNy42MzkgMTUsMTIuNzY0IDE2LjE4LDIwIDEwLDE2LjU4MyAzLjgyLDIwIDUsMTIuNzY0IDAsNy42MzkgNi45MSw2LjU4MyAiLz48L3N2Zz4=');
  background-size: contain;
}
.star-rating i {
  opacity: 0;
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 20%;
  z-index: 1;
  background: url('data:image/svg+xml;base64,PHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkveGxpbmsiIHg9IjBweCIgeT0iMHB4IiB3aWR0aD0iMjBweCIgaGVpZ2h0PSIyMHB4IiB2aWV3Qm94PSIwIDAgMjAgMjAiIGVuYWJsZS1iYWNrZ3JvdW5kPSJuZXcgMCAwIDIwIDIwIiB4bWw6c3BhY2U9InByZXNlcnZlIj48cG9seWdvbiBmaWxsPSIjRkZERjg4IiBwb2ludHM9IjEwLDAgMTMuMDksNi41ODMgMjAsNy42MzkgMTUsMTIuNzY0IDE2LjE4LDIwIDEwLDE2LjU4MyAzLjgyLDIwIDUsMTIuNzY0IDAsNy42MzkgNi45MSw2LjU4MyAiLz48L3N2Zz4=');
  background-size: contain;
}
.star-rating input {
  -moz-appearance: none;
  -webkit-appearance: none;
  opacity: 0;
  display: inline-block;
  width: 20%;
  height: 100%;
  margin: 0;
  padding: 0;
  z-index: 2;
  position: relative;
}
.star-rating input:hover + i,
.star-rating input:checked + i {
  opacity: 1;
}
.star-rating i ~ i {
  width: 40%;
}
.star-rating i ~ i ~ i {
  width: 60%;
}
.star-rating i ~ i ~ i ~ i {
  width: 80%;
}
.star-rating i ~ i ~ i ~ i ~ i {
  width: 100%;
}
::after,
::before {
  height: 100%;
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  text-align: center;
  vertical-align: middle;
}

<span class="star-rating col-sm-10">
  <input type="radio" name="rating" value="1"><i></i>
  <input type="radio" name="rating" value="2"><i></i>
  <input type="radio" name="rating" value="3"><i></i>
  <input type="radio" name="rating" value="4"><i></i>
  <input type="radio" name="rating" value="5"><i></i>
</span>

回答1:

Add the checked attribute to the desired input:

<span class="star-rating col-sm-10">
  <input type="radio" name="rating" value="1"><i></i>
  <input type="radio" name="rating" value="2"><i></i>
  <input type="radio" name="rating" value="3" checked><i></i>
  <input type="radio" name="rating" value="4"><i></i>
  <input type="radio" name="rating" value="5"><i></i>
</span>

You will also need to add this CSS

.star-rating input:hover ~ input:checked + i {
  opacity: 0;
}

.star-rating {
  font-size: 0;
  white-space: nowrap;
  display: inline-block;
  width: 150px;
  height: 30px;
  overflow: hidden;
  position: relative;
  background: url('data:image/svg+xml;base64,PHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkveGxpbmsiIHg9IjBweCIgeT0iMHB4IiB3aWR0aD0iMjBweCIgaGVpZ2h0PSIyMHB4IiB2aWV3Qm94PSIwIDAgMjAgMjAiIGVuYWJsZS1iYWNrZ3JvdW5kPSJuZXcgMCAwIDIwIDIwIiB4bWw6c3BhY2U9InByZXNlcnZlIj48cG9seWdvbiBmaWxsPSIjREREREREIiBwb2ludHM9IjEwLDAgMTMuMDksNi41ODMgMjAsNy42MzkgMTUsMTIuNzY0IDE2LjE4LDIwIDEwLDE2LjU4MyAzLjgyLDIwIDUsMTIuNzY0IDAsNy42MzkgNi45MSw2LjU4MyAiLz48L3N2Zz4=');
  background-size: contain;
}
.star-rating i {
  opacity: 0;
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 20%;
  z-index: 1;
  background: url('data:image/svg+xml;base64,PHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkveGxpbmsiIHg9IjBweCIgeT0iMHB4IiB3aWR0aD0iMjBweCIgaGVpZ2h0PSIyMHB4IiB2aWV3Qm94PSIwIDAgMjAgMjAiIGVuYWJsZS1iYWNrZ3JvdW5kPSJuZXcgMCAwIDIwIDIwIiB4bWw6c3BhY2U9InByZXNlcnZlIj48cG9seWdvbiBmaWxsPSIjRkZERjg4IiBwb2ludHM9IjEwLDAgMTMuMDksNi41ODMgMjAsNy42MzkgMTUsMTIuNzY0IDE2LjE4LDIwIDEwLDE2LjU4MyAzLjgyLDIwIDUsMTIuNzY0IDAsNy42MzkgNi45MSw2LjU4MyAiLz48L3N2Zz4=');
  background-size: contain;
}
.star-rating input {
  -moz-appearance: none;
  -webkit-appearance: none;
  opacity: 0;
  display: inline-block;
  width: 20%;
  height: 100%;
  margin: 0;
  padding: 0;
  z-index: 2;
  position: relative;
}
.star-rating input:hover ~ input:checked + i {
  opacity: 0;
}
.star-rating input:hover + i,
.star-rating input:checked + i {
  opacity: 1;
}
.star-rating i ~ i {
  width: 40%;
}
.star-rating i ~ i ~ i {
  width: 60%;
}
.star-rating i ~ i ~ i ~ i {
  width: 80%;
}
.star-rating i ~ i ~ i ~ i ~ i {
  width: 100%;
}
::after,
::before {
  height: 100%;
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  text-align: center;
  vertical-align: middle;
}

<span class="star-rating col-sm-10">
  <input type="radio" name="rating" value="1"><i></i>
  <input type="radio" name="rating" value="2"><i></i>
  <input type="radio" name="rating" value="3" checked><i></i>
  <input type="radio" name="rating" value="4"><i></i>
  <input type="radio" name="rating" value="5"><i></i>
</span>

Or, alternatively, replace

.star-rating:hover input:checked + i

with

.star-rating:not(:hover) input:checked + i

.star-rating {
  font-size: 0;
  white-space: nowrap;
  display: inline-block;
  width: 150px;
  height: 30px;
  overflow: hidden;
  position: relative;
  background: url('data:image/svg+xml;base64,PHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkveGxpbmsiIHg9IjBweCIgeT0iMHB4IiB3aWR0aD0iMjBweCIgaGVpZ2h0PSIyMHB4IiB2aWV3Qm94PSIwIDAgMjAgMjAiIGVuYWJsZS1iYWNrZ3JvdW5kPSJuZXcgMCAwIDIwIDIwIiB4bWw6c3BhY2U9InByZXNlcnZlIj48cG9seWdvbiBmaWxsPSIjREREREREIiBwb2ludHM9IjEwLDAgMTMuMDksNi41ODMgMjAsNy42MzkgMTUsMTIuNzY0IDE2LjE4LDIwIDEwLDE2LjU4MyAzLjgyLDIwIDUsMTIuNzY0IDAsNy42MzkgNi45MSw2LjU4MyAiLz48L3N2Zz4=');
  background-size: contain;
}
.star-rating i {
  opacity: 0;
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 20%;
  z-index: 1;
  background: url('data:image/svg+xml;base64,PHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkveGxpbmsiIHg9IjBweCIgeT0iMHB4IiB3aWR0aD0iMjBweCIgaGVpZ2h0PSIyMHB4IiB2aWV3Qm94PSIwIDAgMjAgMjAiIGVuYWJsZS1iYWNrZ3JvdW5kPSJuZXcgMCAwIDIwIDIwIiB4bWw6c3BhY2U9InByZXNlcnZlIj48cG9seWdvbiBmaWxsPSIjRkZERjg4IiBwb2ludHM9IjEwLDAgMTMuMDksNi41ODMgMjAsNy42MzkgMTUsMTIuNzY0IDE2LjE4LDIwIDEwLDE2LjU4MyAzLjgyLDIwIDUsMTIuNzY0IDAsNy42MzkgNi45MSw2LjU4MyAiLz48L3N2Zz4=');
  background-size: contain;
}
.star-rating input {
  -moz-appearance: none;
  -webkit-appearance: none;
  opacity: 0;
  display: inline-block;
  width: 20%;
  height: 100%;
  margin: 0;
  padding: 0;
  z-index: 2;
  position: relative;
}
.star-rating input:hover + i,
.star-rating:not(:hover) input:checked + i {
  opacity: 1;
}
.star-rating i ~ i {
  width: 40%;
}
.star-rating i ~ i ~ i {
  width: 60%;
}
.star-rating i ~ i ~ i ~ i {
  width: 80%;
}
.star-rating i ~ i ~ i ~ i ~ i {
  width: 100%;
}
::after,
::before {
  height: 100%;
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  text-align: center;
  vertical-align: middle;
}

<span class="star-rating col-sm-10">
  <input type="radio" name="rating" value="1"><i></i>
  <input type="radio" name="rating" value="2"><i></i>
  <input type="radio" name="rating" value="3" checked><i></i>
  <input type="radio" name="rating" value="4"><i></i>
  <input type="radio" name="rating" value="5"><i></i>
</span>

回答2:

Set the checked attribute on the 4th (or whichever) option using server side scripting:

<span class="star-rating col-sm-10">
  <input type="radio" name="rating" value="1"><i></i>
  <input type="radio" name="rating" value="2"><i></i>
  <input type="radio" name="rating" value="3"><i></i>
  <input type="radio" name="rating" value="4" checked><i></i>
  <input type="radio" name="rating" value="5"><i></i>
</span>

来源：https://stackoverflow.com/questions/27337174/i-use-pure-css-for-star-rating-how-can-i-default-rating-value

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css

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