jQuery：单选按钮名称包含字符串

Question

我正在尝试定位一组名称中包含字符串一部分的单选按钮...

if (!$("input:radio[name=PercentageValue]:checked"))
    alert("you need to check a percentage");

那不行......

Answer 1

jQuery Contains Selector是~=

http://api.jquery.com/attribute-contains-word-selector/

此外，$("input:radio[name=PercentageValue]:checked")始终为true，请尝试使用.is(":checked")，它将返回如下布尔值：

if (!$("input:radio[name=~'PercentageValue']").is(":checked"))
    alert("you need to check a percentage");

Answer 2

尝试

if (!$("input:radio[name=PercentageValue]:checked").length)
    alert("you need to check a percentage");