输入范围滑块未正确显示答案

【问题标题】：Input range sliders are not displaying correctly输入范围滑块未正确显示
【发布时间】：2018-08-08 08:45:31
【问题描述】：

显示输入类型范围滑块值的问题。我该如何解决这个问题？

function update_SchoolValues(val) {
  if (val == 'Middle') {
    var Length = 1;
    var Hours = 30;
    var Subject = 1000;
    document.getElementById('Length').value = Length;
    document.getElementById('Hours').value = Hours;
    document.getElementById('Subject').value = Subject;
    document.getElementById("Length").innerHTML = Length;
    document.getElementById("Hours").innerHTML = Hours;
    document.getElementById("Subject").innerHTML = Subject;
  } else if (val == 'Element') {
    var Length = 1.6;
    var Hours = 10;
    var Subject = 80000;
    document.getElementById('Length').value = Length;
    document.getElementById('Hours').value = Hours;
    document.getElementById('Subject').value = Subject;
    document.getElementById("Length").innerHTML = Length;
    document.getElementById("Hours").innerHTML = Hours;
    document.getElementById("Subject").innerHTML = Subject;
  } else if (val == 'High') {
    var Length = 0;
    var Hours = 0;
    var Subject = 0;
    document.getElementById('Length').value = Length;
    document.getElementById('Hours').value = Hours;
    document.getElementById('Subject').value = Subject;
    document.getElementById("Length").innerHTML = Length;
    document.getElementById("Hours").innerHTML = Hours;
    document.getElementById("Subject").innerHTML = Subject;
  } else if (val == 'Undefined') {
    document.getElementById('Length').value = 0;
    document.getElementById('Hours').value = 0;
    document.getElementById('Subject').value = 0;
  } else {}
}

body,
select,
checkbox {
  font: 14pt sans;
}

#label {
  font-size: 14px;
}

.slidecontainer {
  width: 70%;
}

.slider {
  -webkit-appearance: none;
  width: 70%;
  height: 11px;
  background: lightblue;
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 11px;
  height: 11px;
  background: #69F;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 11px;
  height: 11px;
  background: #69F;
  cursor: pointer;
}

.page {
  width: 100vw;
  height: 90vh;
  position: fixed;
  top: 10;
  left: -100vw;
  overflow-y: auto;
  z-index: 0;
  background-color: hsl(0, 0%, 100%);
}

page {
  color: red;
}

.page:target {
  left: 0vw;
  z-index: 1;
}

table.genInfoTable {
  margin: auto;
  font-family: verdana, arial, sans-serif;
  font-size: 11px;
  text-align: left;
  color: #333333;
  border: 2px solid #343434;
  border-collapse: separate;
  border-spacing: 10px 20px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<!doctype html>
<html>

<head>
  <meta charset="utf-8" />

  <table class="genInfoTable">
    <tr>
      <th id="label">Testing</th>
      <td><input type="text" id="One1" /></td>
    </tr>
    <tr>
      <th id="label">School</th>
      <td>
        <select id="School" onChange="update_SchoolValues(this.value);">
          <option value="">Select</option>
          <option value="Middle">Middle</option>
          <option value="Element">Element</option>
          <option value="High">High</option>
          <option value="Undefined">Undefined</option>
        </select>
      </td>
    </tr>
    <tr>
      <td colspan="2" style="border:none">
        <div id="GeneralDiv" style="visibility:visible" style="border: 0px;">
          <table style="border:none;">
            <tr>
              <th id="label">Length</th>
              <td><input type="Range" min="0" max="15" step="0.2" value="0" id="Length" oninput="document.getElementById('Length').innerHTML = this.value;" class="slider">
                </input>
                <em id="Length" style="font-style: normal;"></em>
              </td>
            </tr>
            <tr>
              <th id="label">Hours</th>
              <td><input type="Range" min="0" max="30" step="5" value="0" id="Hours" oninput="document.getElementById('Hours').innerHTML = this.value;" class="slider">
                </input>
                <em id="Hours" style="font-style: normal;"></em>
              </td>
            </tr>
            <tr>
              <th id="label">Subject</th>
              <td><input type="Range" min="0" max="10000" step="500" value="0" id="Subject" oninput="document.getElementById('Subject').innerHTML = this.value;" class="slider">
                </input>
                <em id="Subject" style="font-style: normal;"></em>
              </td>
            </tr>
            <em id="Length" style="font-style: normal;"></em> <br>
            <em id="Hours" style="font-style: normal;"></em> <br>
            <em id="Subject" style="font-style: normal;"></em> <br>
          </table>
        </div>
      </td>
    </tr>
  </table>

</html>

【问题讨论】：

请澄清您的具体问题或添加其他详细信息以准确突出您的需要。正如目前所写的那样，很难准确地说出你在问什么。
"好的。从代码 "" 应该显示滑块的值。但不显示在内。如果我使用相同的在或之后显示值。但我需要在每个滑块附近显示滑块值。希望你现在能理解这一点。

我在不同的页面中使用了滑块，但是，显示相应的值没有问题。但为此，我花了很多时间来弄清楚。但没有运气！

我已经找到问题的根源，请检查我的答案。

标签： javascript html css slider range

【解决方案1】：

您应该始终防止重复的 id，因为标识符在同一个文档中应该是唯一的，主要问题来自修复它们时重复的 id，代码将正常工作，如下所示：

function update_SchoolValues(val) {
  if (val == 'Middle') {
    var Length = 1;
    var Hours = 30;
    var Subject = 1000;
    document.getElementById('Length').value = Length;
    document.getElementById('Hours').value = Hours;
    document.getElementById('Subject').value = Subject;
    document.getElementById("Length_val").innerHTML = Length;
    document.getElementById("Hours_val").innerHTML = Hours;
    document.getElementById("Subject_val").innerHTML = Subject;
  } else if (val == 'Element') {
    var Length = 1.6;
    var Hours = 10;
    var Subject = 80000;
    document.getElementById('Length').value = Length;
    document.getElementById('Hours').value = Hours;
    document.getElementById('Subject').value = Subject;
    document.getElementById("Length_val").innerHTML = Length;
    document.getElementById("Hours_val").innerHTML = Hours;
    document.getElementById("Subject_val").innerHTML = Subject;
  } else if (val == 'High') {
    var Length = 0;
    var Hours = 0;
    var Subject = 0;
    document.getElementById('Length').value = Length;
    document.getElementById('Hours').value = Hours;
    document.getElementById('Subject').value = Subject;
    document.getElementById("Length_val").innerHTML = Length;
    document.getElementById("Hours_val").innerHTML = Hours;
    document.getElementById("Subject_val").innerHTML = Subject;
  } else if (val == 'Undefined') {
    document.getElementById('Length').value = 0;
    document.getElementById('Hours').value = 0;
    document.getElementById('Subject').value = 0;
  } else {}
}

body,
select,
checkbox {
  font: 14pt sans;
}

#label {
  font-size: 14px;
}

.slidecontainer {
  width: 70%;
}

.slider {
  -webkit-appearance: none;
  width: 70%;
  height: 11px;
  background: lightblue;
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 11px;
  height: 11px;
  background: #69F;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 11px;
  height: 11px;
  background: #69F;
  cursor: pointer;
}

.page {
  width: 100vw;
  height: 90vh;
  position: fixed;
  top: 10;
  left: -100vw;
  overflow-y: auto;
  z-index: 0;
  background-color: hsl(0, 0%, 100%);
}

page {
  color: red;
}

.page:target {
  left: 0vw;
  z-index: 1;
}

table.genInfoTable {
  margin: auto;
  font-family: verdana, arial, sans-serif;
  font-size: 11px;
  text-align: left;
  color: #333333;
  border: 2px solid #343434;
  border-collapse: separate;
  border-spacing: 10px 20px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<!doctype html>
<html>

<head>
  <meta charset="utf-8" />

  <table class="genInfoTable">
    <tr>
      <th id="label">Testing</th>
      <td><input type="text" id="One1" /></td>
    </tr>
    <tr>
      <th id="label">School</th>
      <td>
        <select id="School" onChange="update_SchoolValues(this.value);">
          <option value="">Select</option>
          <option value="Middle">Middle</option>
          <option value="Element">Element</option>
          <option value="High">High</option>
          <option value="Undefined">Undefined</option>
        </select>
      </td>
    </tr>
    <tr>
      <td colspan="2" style="border:none">
        <div id="GeneralDiv" style="visibility:visible" style="border: 0px;">
          <table style="border:none;">
            <tr>
              <th id="label">Length</th>
              <td><input type="Range" min="0" max="15" step="0.2" value="0" id="Length" oninput="document.getElementById('Length_val').innerHTML = this.value;" class="slider">
                <em id="Length_val" style="font-style: normal;"></em>
              </td>
            </tr>
            <tr>
              <th id="label">Hours</th>
              <td><input type="Range" min="0" max="30" step="5" value="0" id="Hours" oninput="document.getElementById('Hours_val').innerHTML = this.value;" class="slider">
                <em id="Hours_val" style="font-style: normal;"></em>
              </td>
            </tr>
            <tr>
              <th id="label">Subject</th>
              <td><input type="Range" min="0" max="10000" step="500" value="0" id="Subject" oninput="document.getElementById('Subject_val').innerHTML = this.value;" class="slider">
                <em id="Subject_val" style="font-style: normal;"></em>
              </td>
            </tr>
          </table>
        </div>
      </td>
    </tr>
  </table>

</html>

【讨论】：

你成就了我的一天！非常感谢。