Question

我已经完成了以下问题，但没有一个人能得到我想要的答案： - （所以请不要将它们联系起来并将其标记为重复）。

Using JavaScript to edit CSS gradient
Is there a way to style HTML5's range control?
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Change color of input range slider with javascript [duplicate]

我有三个这样的滑块。

它们是我使用渐变的RGB滑块。在红色滑块中，绿色和蓝色值为0.即红色滑块的渐变值：rgb（0,0,0）到rgb（255,0,0）。

我想更改蓝色滑块和绿色滑块的渐变，因为我使用javascript滑动红色滑块。如果我将红色值更改为120。然后在蓝色滑块中，渐变必须从rgb（old_red_value，0，old_green_value）更改为rgb（changed_red_value，255，old_green_value）

用于为div定义颜色。

<head>
<style type="text/css">
.slider {
    display: inline;
    -webkit-appearance: none;
    height: 15px;
    border-radius: 5px;
    background: #d3d3d3;
    outline: none;
    -webkit-transition: .2s;
    transition: opacity .2s;
    width: 80%;
    margin-left: 5%;
}
#red_slider{
    background: linear-gradient(to right, rgb(0,0,0) , rgb(255,0,0) );
}
#green_slider{
    background: linear-gradient(to right, rgb(0,0,0) , rgb(0,255,0) );
}
#blue_slider{
    background: linear-gradient(to right, rgb(0,0,0) , rgb(0,0,255) );
}
</style>
</head>
<body>  
<input type="range" min="0" max="255" value="127" class="slider" id="red_slider">
<p>Red: <span id="red_value"></span></p>

<input type="range" min="0" max="255" value="127" class="slider" id="green_slider">
<p>Green: <span id="green_value"></span></p>

<input type="range" min="0" max="255" value="127" class="slider" id="blue_slider">
<p>Blue: <span id="blue_value"></span></p>

<script type="text/javascript">

    var red_slider = document.getElementById("red_slider");
    var green_slider = document.getElementById("green_slider");
    var blue_slider = document.getElementById("blue_slider");

    var red_output = document.getElementById("red_value");
    var green_output = document.getElementById("green_value");
    var blue_output = document.getElementById("blue_value");

    red_output.innerHTML = red_slider.value;
    green_output.innerHTML = green_slider.value;
    blue_output.innerHTML = blue_slider.value;

    var red_val = red_slider.value;
    var green_val = green_slider.value;
    var blue_val = blue_slider.value;

    red_slider.oninput = function() {
        red_output.innerHTML = this.value;
        red_val = this.value;
        disp.style.backgroundColor = "rgb("+red_val+","+green_val+","+blue_val+")";
        rgb_value.innerHTML = "rgb("+red_val+","+green_val+","+blue_val+")";
        // hex_value.innerHTML = "hex("+red_val.toString(16) +","+green_val.toString(16) +","+blue_val.toString(16) +")";

        // blue_slider.style.background = "black";
        // blue_slider.css{
        //  background: linear-gradient(to right, rgb($red_val,0,0) , rgb($red_val,0,255) );
        // }

        // blue_slider.style.background = "linear-gradient(to right, rgb("+red_val+",0,0) , rgb("+red_val+",0,255) );";
    }
    green_slider.oninput = function() {
        green_output.innerHTML = this.value;
        green_val = this.value;
        disp.style.backgroundColor = "rgb("+red_val+","+green_val+","+blue_val+")";
        rgb_value.innerHTML = "rgb("+red_val+","+green_val+","+blue_val+")";
        // hex_value.innerHTML = "rgb("+red_val+","+green_val+","+blue_val+")";
    }
    blue_slider.oninput = function() {
        blue_output.innerHTML = this.value;
        blue_val = this.value;
        disp.style.backgroundColor = "rgb("+red_val+","+green_val+","+blue_val+")";
        rgb_value.innerHTML = "rgb("+red_val+","+green_val+","+blue_val+")";
        // hex_value.innerHTML = "rgb("+red_val+","+green_val+","+blue_val+")";
    }
</script>

我可以使用js将其更改为固定颜色 - blue_slider.style.background = "black";，但我的问题是使用js将其更改为不同的颜色渐变。

Answer 1

在这种情况下，我会考虑使用CSS变量来简化代码。我们的想法是使用JS更改颜色变量，代码将会减少。

然后，您可以使用所需位置的变量并仅使用CSS调整渐变颜色：

＆＃13;

var red_slider = document.getElementById("red_slider");
var green_slider = document.getElementById("green_slider");
var blue_slider = document.getElementById("blue_slider");

var red_output = document.getElementById("red_value");
var green_output = document.getElementById("green_value");
var blue_output = document.getElementById("blue_value");


red_slider.oninput = function() {
  red_output.innerHTML = this.value;
  document.documentElement.style.setProperty('--red-color', this.value);

}
green_slider.oninput = function() {
  green_output.innerHTML = this.value;
  document.documentElement.style.setProperty('--green-color', this.value);

}
blue_slider.oninput = function() {
  blue_output.innerHTML = this.value;
  document.documentElement.style.setProperty('--blue-color', this.value);
}

＆＃13;

:root {
 --red-color:127;
 --blue-color:127;
 --green-color:127;
}

.slider {
  display: inline;
  -webkit-appearance: none;
  height: 15px;
  border-radius: 5px;
  background: #d3d3d3;
  outline: none;
  -webkit-transition: .2s;
  transition: opacity .2s;
  width: 80%;
  margin-left: 5%;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  background: #4CAF50;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 25px;
  height: 25px;
  border-radius: 50%;
  background: #4CAF50;
  cursor: pointer;
}

#rgb_value_container {
  /*margin: 16px auto;*/
  text-align: center;
  font-weight: bold;
  font-size: 20px;
}

#red_slider {
  background: linear-gradient(to right, rgb(0, 0, 0), rgb(255, var(--green-color), var(--blue-color)));
}

#green_slider {
  background: linear-gradient(to right, rgb(0, 0, 0), rgb(var(--red-color), 255, var(--blue-color)));
}

#blue_slider {
  background: linear-gradient(to right, rgb(0, 0, 0), rgb(var(--red-color), var(--green-color), 255));
}

#color_box {
  width: 250px;
  height: 250px;
  margin: 30px auto;
  background-color: rgb(var(--red-color), var(--green-color), var(--blue-color));
}

＆＃13;

<div id="color_box"></div>


<input type="range" min="0" max="255" value="127" class="slider" id="red_slider">
<p>Red: <span id="red_value">127</span></p>

<input type="range" min="0" max="255" value="127" class="slider" id="green_slider">
<p>Green: <span id="green_value">127</span></p>

<input type="range" min="0" max="255" value="127" class="slider" id="blue_slider">
<p>Blue: <span id="blue_value">127</span></p>

＆＃13;

使用js更改输入滑块的颜色渐变？

1 个答案: