javascript - 如果选中一个则禁用所有复选框，并在未选中时启用

Question

我正在编写一个基本脚本，但我似乎无法理解它为什么不起作用。基本上，如果选中一个复选框，脚本会锁定所有复选框，然后如果用户决定取消选中复选框，则将其解锁。

这是代码

//Script for questions where you check one option or the other (locks other options out)
$('.optionBox input').click(function(){
    var optionBoxElement$ = $(this).closest('.optionBox');

    //If no option is checked, the make all the options available to be selected
    //Otherwise, one option must be checked so lock out all other options
    if(optionBoxElement.find('input:not(:checked)').length == optionBoxElement.find(':input').length)
        optionBoxElement.find(':input').prop('disabled',false); 
    else
        optionBoxElement.find('input:not(:checked)').prop('disabled',true); 
        optionBoxElement.find('input:checked').prop('disabled',false); //makes sure that the checkbox that was checked is not disabled so the user can uncheck and change his answer    

});

Answer 1

你可以像下面那样做。您所要做的就是检查复选框是否被选中。

$('.optionBox input:checkbox').click(function(){
    var $inputs = $('.optionBox input:checkbox'); 
    if($(this).is(':checked')){  // <-- check if clicked box is currently checked
       $inputs.not(this).prop('disabled',true); // <-- disable all but checked checkbox
    }else{  //<-- if checkbox was unchecked
       $inputs.prop('disabled',false); // <-- enable all checkboxes
    }
})

http://jsfiddle.net/ZB8pT/

Answer 2

像这样的小提琴：

//Script for questions where you check one option or the other (locks other options out)
$(':checkbox').click(function(){ 

    var $checkbox = $(this);
    var isChecked = $checkbox.is(':checked')

    //If no option is checked, the make all the options available to be selected
    //Otherwise, one option must be checked so lock out all other options
    if(isChecked)
        $checkbox.siblings(":checkbox").attr("disabled", "disabled");
    else
        $checkbox.siblings(":checkbox").removeAttr("disabled"); 

});​

Answer 3

也许像这样的小提琴。

$('.optionBox :checkbox').click(function() {
    var $checkbox = $(this), checked = $checkbox.is(':checked');
    $checkbox.closest('.optionBox').find(':checkbox').prop('disabled', checked);
    $checkbox.prop('disabled', false);
});