jQuery选择更改不触发 [英] Jquery select change not firing

问题描述

我需要捕捉的时候一个选择框的变化，应该是简单的！

I need to capture when a select box changes, should be simple!

    $('#multiid').change(function(){
    alert('Change Happened');
});

但是它不起作用，我怀疑问题是只有在需要时才创建它的文档上不存在选择框，因此我将其以HTML创建为空，并用代码填充了它作为测试，但这没有也不行.

But it does not work, I suspected the problem is that the select box does not exist on document ready it is created only if needed, so I created it empty in HTML, populated it with code as a test but that didn't work either.

function buildmulti(id,name,price) {
    // build action items for action bar
    var optlist = $('<select></select>').attr('id', 'multiid').attr('name', 'multiid');
    optlist.append('<option value="0">Select Size</option>');
    $.each(option, function(index, val) {
        if(val.prodID *1  == id * 1) {
            v = val.ID;
            fprice = price * 1 + val.pricechange * 1;
            t = name + ' - ' + val.variation +  ' - ' + currency + (fprice).toFixed(2);
            optlist.append('<option value="' + v + '">' + t + '</option>');
        }
    })
    $('#addbasket').append(optlist);
};

可能是另一个不合适的支架，但是我找不到它！

it's probably another bracket out of place, but I can't find it!

推荐答案

尝试

 $(document).on('change','#multiid',function(){
    alert('Change Happened');
});

由于选择框是通过代码生成的，因此您必须使用事件委托，而不是$(document)您可以拥有最接近的父元素.

As your select-box is generated from the code, so you have to use event delegation, where in place of $(document) you can have closest parent element.

或

$(document.body).on('change','#multiid',function(){
    alert('Change Happened');
});

更新:

第二个方法工作正常，选择器还有另一处更改，以使其正常工作.

Second one works fine, there is another change of selector to make it work.

$('#addbasket').on('change','#multiid',function(){
    alert('Change Happened');
});

理想情况下，我们应该使用$("#addbasket")，因为它是最接近的父元素[正如我上面提到的].

Ideally we should use $("#addbasket") as it's the closest parent element [As i have mentioned above].

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