使用 jquery 检测任何选定的下拉值?

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时间:2020-08-26 12:07:15  来源:igfitidea点击:

detecting any selected dropdown value with jquery?

jquery

提问by Joe

I have a function that detects all input value changes with keyup:

我有一个函数可以用 keyup 检测所有输入值的变化:

Jquery:

查询:

// detect all inputs

$('.inputChange').each(function() {
   // Save current value of element
   $(this).data('oldVal', $(this).val())

   // Look for changes in the value
   $(this).bind("propertychange keyup input paste", function(event){
      // If value has changed...
      if ($(this).data('oldVal') != $(this).val()) {
       // Updated stored value
       $(this).data('oldVal', $(this).val())
        currentVal = $(this).val()
       // Do action
       inputElement = $(this).attr('data-element')
       inputProperty = $(this).attr('data-property')
       inputUnit = $(this).attr('data-unit')
        updateAllCSS(inputElement, inputProperty, currentVal + inputUnit)
     }
   });
 });

HTML:

HTML:

    <input class="inputChange" data-element=".homeTemplate #colaAlpha h1" data-property="font-size" data-unit="px">px

I now need to do another that will get the selected dropdown values from this HTML:

我现在需要做另一个从这个 HTML 中获取所选下拉值的操作:

     <select class="selectChange" data-element=".homeTemplate #colaAlpha" data-property="height" data-unit="px">
         <option value="8">8px</option>
         <option value="12">12px</option>
         <option value="21">21px</option>
     </select>px

I was wondering how I should go about doing this? is there perhaps a propertychange event that will work?

我想知道我该怎么做?也许有一个propertychange 事件会起作用?

回答by Geert

Have a look at http://api.jquery.com/change/:

看看http://api.jquery.com/change/

$(".selectChange").change(function (){
    alert($(this).val());
});

回答by Joe

Unlike the above complex input detection code, here is the select code that will work for any of the selects on my page- it uses the selected value and also the data tags:

与上面复杂的输入检测代码不同,这里的选择代码适用于我页面上的任何选择——它使用选定的值和数据标签:

$('.selectChange').change(function() {
    updateAllCSS($(this).attr('data-element'), $(this).attr('data-property'), $(this).val() + $(this).attr('data-unit'))
});