HTML Javascript用滑块条步骤更改图像 [英] HTML Javascript change image with Slider bar step

问题描述

 <输入id ="valR"类型="range" min ="0" max ="100" value ="0" step ="5" oninput ="showVal(this.value)" onchange="showVal(this.value)"/>< span id ="range"> 0</span>< img id ="img">< script>var val = document.getElementById("valR").value;document.getElementById("range").innerHTML = val;document.getElementById("img").src = val +".jpg";函数showVal(newVal){document.getElementById("range").innerHTML = newVal;document.getElementById("img").src = newVal +".jpg";}</script> 

基于此代码，我需要能够加载介于0-35之间的范围(介于35-65之间的另一个图像和65-100之间的另一个图像).

非常感谢您的帮助

解决方案

我添加了带有两个条件的 if(newVal> = 0&& newVal< 35)，以检查值是否为范围内，然后设置< img>

您不能使用 document.getElementById("img").src = newVal +".jpg"; ，在这种情况下，您将获得100张不同的图像

 <输入id ="valR" type ="range" min ="0" max ="100" value ="0"步骤="5" oninput ="showVal(this.value)" onchange ="showVal(this.value)"/>< span id ="range"> 0</span>< img id ="img">< script>var val = document.getElementById("valR").value;document.getElementById("range").innerHTML = val;document.getElementById("img").src = val +".jpg";函数showVal(newVal){document.getElementById("range").innerHTML = newVal;if(newVal> = 0&& newVal< 35)document.getElementById("img").src ="first_image.jpg";否则if(newVal> = 35& newVal< 65)document.getElementById("img").src ="second_image.png";否则if(newVal> = 35& newVal< 65)document.getElementById("img").src ="third_image.png";}</script>  

<input id="valR" type="range" min="0" max="100" value="0" step="5" oninput="showVal(this.value)" onchange="showVal(this.value)" />
    <span id="range">0</span>
    <img id="img">

<script>

    var val = document.getElementById("valR").value;
        document.getElementById("range").innerHTML=val;
        document.getElementById("img").src = val + ".jpg";
        function showVal(newVal){
          document.getElementById("range").innerHTML=newVal;
          document.getElementById("img").src = newVal+ ".jpg";
        }
</script>

hi people, based on this code, I need to be able to load the range between 0 - 35 an image between 35 - 65 another image and 65 - 100 other.

thank you very much for your help

解决方案

I added if(newVal >= 0 && newVal < 35) with 2 conditions to check if value is in a range and then set <img>

You can't use document.getElementById("img").src = newVal+ ".jpg";, in that case you will get 100 different images

<input id="valR" type="range" min="0" max="100" value="0" step="5" oninput="showVal(this.value)" onchange="showVal(this.value)" />
    <span id="range">0</span>
    <img id="img">

<script>

    var val = document.getElementById("valR").value;
        document.getElementById("range").innerHTML=val;
        document.getElementById("img").src = val + ".jpg";
        function showVal(newVal){
          document.getElementById("range").innerHTML=newVal;
          if(newVal >= 0 && newVal < 35)
            document.getElementById("img").src = "first_image.jpg";
          else if(newVal >= 35 && newVal < 65)
            document.getElementById("img").src = "second_image.png";
          else if(newVal >= 35 && newVal < 65)
            document.getElementById("img").src = "third_image.png";
        }
</script>

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