javascript - 如何使用 JavaScript 或最好是 jQuery 撤消单选按钮选择

Question

我正在处理具有一组单选按钮选择的场景。 要求是只能选2个是。 因此，如果第三个也选择"is"，我想将其恢复为“否”

此外，我还想知道是否可以只检查组内单选按钮的给定索引是否已检查，而不是这样做: “($(this).is(':checked') && $(this).val() == 'Y')”

jsFiddle链接:http://jsfiddle.net/pshah331/S8qep/

HTML:

<p>Folder A:
    <input type="radio" name="folder_A" value="Y" onclick="folderSelectionChanged()" />Yes
    <input type="radio" name="folder_A" value="N" onclick="folderSelectionChanged()" />No</p>
<p>Folder B:
    <input type="radio" name="folder_B" value="Y" onclick="folderSelectionChanged()" />Yes
    <input type="radio" name="folder_B" value="N" onclick="folderSelectionChanged()" />No</p>
<p>Folder C:
    <input type="radio" name="folder_C" value="Y" onclick="folderSelectionChanged()" />Yes
    <input type="radio" name="folder_C" value="N" onclick="folderSelectionChanged()" />No</p>
<div id="update"></div>

“HEAD”中的 JavaScript:

function folderSelectedYesCount() {
    var yesCount = 0;
    var folderRadioGroups = $("input[name^='folder_']");


    folderRadioGroups.each(function () {
        // TODO:  Would like to check by index --> "index 0 is selected/checked"
        if ($(this).is(':checked') && $(this).val() == 'Y') {
            yesCount++;
        }
    });

    return yesCount;
}

function folderSelectionChanged() {
    // TODO:  If count of Yes is greater than 2, then change the last clicked to "No"
    /*
    if (folderSelectedYesCount() > 1){
        $(this)[1].prop('checked', true);
    }
    */

    $('#update').html('Selection count for "Yes" is <b>' + folderSelectedYesCount() + ' </b>');
}

Answer 1

我已经更新了你的 jsfiddle 请检查:-

function folderSelectionChanged(e) {

    if(folderSelectedYesCount()>2){
        $(e).siblings().prop("checked",true);         
    }
    $('#update').html('Selection count for "Yes" is <b>' + folderSelectedYesCount() + ' </b>');
}

点击这里:- http://jsfiddle.net/S8qep/47/

谢谢