JavaScript onclick 事件在 <select> <option> 上不起作用吗？

Does the JavaScript onclick event not work on <select> <option>'s?

提问by user123498

For some reason the code below it is not working correctly. Unless I'm being quite stupid with my JavaScript I can't see what's going wrong besides the onclick events not firing on the <option>s.

由于某种原因，它下面的代码无法正常工作。除非我对我的 JavaScript 非常愚蠢，否则除了 onclick 事件没有在<option>s上触发之外，我看不出出了什么问题。

function showOther() {
  document.getElementById('other').value = "";
  document.getElementById('other').style.display = 'block';
  document.getElementById('otherBR').style.display = 'block';
}

function hideOther() {
  document.getElementById('other').style.display = 'none';
  document.getElementById('otherBR').style.display = 'none';
}

#other {
  display: none;
}
#otherBr {
  display: none;
}

<select name="" id="drop_down">
  <option value="choose" onclick="hideOther();">Please choose</option>
  <option value="Allure" onclick="hideOther();">Allure</option>
  <option value="Elle" onclick="hideOther();">Elle</option>
  <option value="In-Style" onclick="hideOther();">In-Style</option>
  <option value="other" id="otherOption" onclick="showOther();">Other</option>
</select>
<input type="text" name="fields_where" id="other" placeholder="Other" />
<br id="otherBR" />

回答by Brian Driscoll

Add this function to your JS:

将此函数添加到您的 JS：

function showHideOther(){
    if (document.getElementById('drop_down').value == 'other') {
         showOther();   
    } else {
         hideOther();   
    }
}

And change your select element like this:

并像这样更改您的选择元素：

<select name="" id="drop_down" onchange="showHideOther();">
        <option value="choose">Please choose</option>
        <option value="Allure">Allure</option>
        <option value="Elle">Elle</option>
        <option value="In-Style">In-Style</option>
        <option value="other">Other</option>
</select>

function showHideOther() {
  if (document.getElementById('drop_down').value == 'other') {
    showOther();
  } else {
    hideOther();
  }
}

function showOther() {
  document.getElementById('other').value = "";
  document.getElementById('other').style.display = 'block';
  document.getElementById('otherBR').style.display = 'block';
}

function hideOther() {
  document.getElementById('other').style.display = 'none';
  document.getElementById('otherBR').style.display = 'none';
}

#other {
  display: none;
}
#otherBr {
  display: none;
}

<select name="" id="drop_down" onchange="showHideOther();">
  <option value="choose">Please choose</option>
  <option value="Allure">Allure</option>
  <option value="Elle">Elle</option>
  <option value="In-Style">In-Style</option>
  <option value="other">Other</option>
</select>
<input type="text" name="fields_where" id="other" placeholder="Other" />
<br id="otherBR" />

回答by Alberto Montellano

An answer with JS only, not jQuery:

仅使用 JS 而不是 jQuery 的答案：

onclickevent in option tag is just recognized by Firefox. If you need a solution that works on all browsers such as IE or Chrome you can use onchangeevent on your "Select" element.

选项标签中的onclick事件仅被 Firefox 识别。如果您需要一个适用于所有浏览器（例如 IE 或 Chrome）的解决方案，您可以在“选择”元素上使用onchange事件。

HTML :

HTML :

<select name="" id="drop_down" onchange="showHideOther(this.value);">
    <option value="choose" ">Please choose</option>
    <option value="Allure">Allure</option>
    <option value="Elle" >Elle</option>
    <option value="In-Style" >In-Style</option>
    <option value="other" id="otherOption">Other</option>
</select>

JS defined in the html head section as script:

在 html head 部分定义为脚本的 JS：

function showHideOther(value){
    alert(value);
    if (value==='other'){
        document.getElementById('other').value = "";
        document.getElementById('other').style.display = 'block'; 
        document.getElementById('otherBR').style.display = 'block';
    }
    else{
            document.getElementById('other').style.display = 'none'; 
            document.getElementById('otherBR').style.display = 'none';
    }
}

JSFiddle sample working fine: http://jsfiddle.net/amontellano/gLML3/14/

JSFiddle 示例工作正常：http: //jsfiddle.net/amontellano/gLML3/14/

I hope it helps.

我希望它有帮助。

回答by rgtk

DEMO

演示

var dropdown = document.getElementById('drop_down');

dropdown.onchange = function() {
  var selected = dropdown.options[dropdown.selectedIndex].value;

  switch(selected) {
    case 'other':
      document.getElementById('other').value = "";
      document.getElementById('other').style.display = 'block'; 
      document.getElementById('otherBR').style.display = 'block';
      break;
    default:
      document.getElementById('other').style.display = 'none'; 
      document.getElementById('otherBR').style.display = 'none';
      break;
  }
}

回答by user3058000

just add these function to your code:

只需将这些函数添加到您的代码中：

$('#drop_down').on('change', function(){
    ($(this).val() == 'other') ? showOther() : hideOther();
});

se here: http://jsfiddle.net/gLML3/7/

在这里：http: //jsfiddle.net/gLML3/7/