如何獲得第一循環的指數爲另一個陣列的jQuery

Question

我試圖訪問foreach循環的索引來訪問的第二個元素

$.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"; 
    } 
}); 

這是我的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> 

但我越來越沒有定義。

感謝，

Answer 1

我懷疑問題是不是不確定的指數，但在你選擇冗餘雙引號，儘量消除他們：

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

有了您的原始語法選擇會是什麼樣select[name="category[]["0"]"]，由於未轉義的嵌套雙引號而無效。