通過Javascript更改CSS過濾器值

Question

我正在處理非常基本的圖像編輯器，但無法獲取範圍輸入滑塊（＃fx-slider）來影響實際的css過濾器值。這是代碼：

function ChangeFilter() { 
 

 
    var ifx = document.getElementById("canvasFrame"); 
 
    var br = document.getElementById("br"); 
 
    var ct = document.getElementById("ct"); 
 
    var st = document.getElementById("saturate"); 
 

 
ifx.style.WebkitFilter = "brightness(" + br.value * 10 + "%)"); 
 
ifx.style.filter = "brightness(" + br.value * 10 + "%)"); 
 

 
ifx.style.WebkitFilter = "contrast(" + ct.value * 10 + "%)"); 
 
ifx.style.filter = "contrast(" + ct.value * 10 + "%)"); 
 

 
ifx.style.WebkitFilter = "saturate(" + st.value * 10 + "%)"); 
 
ifx.style.filter = "saturate(" + st.value * 10 + "%)"); 
 
}

#canvasFrame { 
 
    width:100px; 
 
    height:50px; 
 
    filter: brightness(100%) contrast(100%) saturate(100%); 
 
    -webkit-filter: brightness(100%) contrast(100%) saturate(100%); 
 
}

<div class="canvasFrame"> 
 
    <img src="http://www.joomlaworks.net/images/demos/galleries/abstract/7.jpg" alt="image"> 
 
</div> 
 
<div class="fx-slider"> 
 
    <label for="br">Brightness</label> 
 
    <input id="br" name="br" type="range" min="0" max="200" value="100" onchange="ChangeFilter()"> 
 
</div> 
 
<div class="fx-slider"> 
 
    <label for="ct">Contrast</label> 
 
    <input id="ct" name="ct" type="range" min="0" max="200" value="100" onchange="ChangeFilter()"> 
 
</div> 
 
<div class="fx-slider"> 
 
    <label for="st">Saturation</label> 
 
    <input id="st" name="ct" type="range" min="0" max="200" value="100" onchange="ChangeFilter()"> 
 
</div>

任何幫助，將不勝感激！謝謝。 :)

Answer 1

您需要添加一個id到您的畫布容器中，並且您使用錯誤的id來控制飽和度。另外，你應該連接3個控件，否則你只會設置飽和度。

function ChangeFilter() { 
    var ifx = document.getElementById("canvasFrame"); //need to update this id in you html 
    var br = document.getElementById("br"); 
    var ct = document.getElementById("ct"); 
    var st = document.getElementById("st"); //this id was wrong in your code 

    //set all 3 filter values at once. 
    ifx.style.webkitFilter = "brightness(" + br.value * 10 + "%) contrast(" + ct.value * 10 + "%) saturate(" + st.value * 10 + "%)"; 
    ifx.style.filter = "brightness(" + br.value * 10 + "%) contrast(" + ct.value * 10 + "%) saturate(" + st.value * 10 + "%)"; 
} 

CodePen：http://codepen.io/nobrien/pen/BKmevp