如何获得第一循环的指数为另一个阵列的jQuery

Question

我试图访问foreach循环的索引来访问的第二个元素

$.each("input:checkbox[name=city[]]:checked", function (index, item) { 
    var category = $('select[name="category[]["' + index + '"]"]').val(); 
    alert(category); 
    var split = category = category.split('_'); 
    var category = split[0]; 
    if (category == "0") { 
     alert('Please select hotel category'); 
     validate = "false"; 
     return false; 
    } 
    else { 
     validate = "true"; 
    } 
}); 

这是我的HTML

<select name="category[]" 
     id="webmenus_<?php echo $BPackageCityRelatedToCountry[$i]['city_id']; ?>"  
     onchange="showValue(this.value)" 
> 
    <option value="0" selected="selected" title="Please select hotel category"></option> 
    <option value="5_<?php echo $BPackageCityRelatedToCountry[$i]['city_id']; ?>" title="/public/front_end/images/5star.png"></option> 
    <option value="4_<?php echo $BPackageCityRelatedToCountry[$i]['city_id']; ?>" title="/public/front_end/images/4star.png"></option> 
    <option value="3_<?php echo $BPackageCityRelatedToCountry[$i]['city_id']; ?>" title="/public/front_end/images/3star.png"></option> 
    <option value="2_<?php echo $BPackageCityRelatedToCountry[$i]['city_id']; ?>" title="/public/front_end/images/2star.png"></option> 
    <option value="1_<?php echo $BPackageCityRelatedToCountry[$i]['city_id']; ?>" title="/public/front_end/images/1star.png"></option> 
</select> 

但我越来越没有定义。

感谢，

Answer 1

我怀疑问题是不是不确定的指数，但在你选择冗余双引号，尽量消除他们：

var category = $('select[name="category[][' + index + ']"]').val(); 

有了您的原始语法选择会是什么样select[name="category[]["0"]"]，由于未转义的嵌套双引号而无效。