javascript – jQuery – 根据另一个字段选择值禁用输入字段

我正在寻找一个执行此操作的jQuery插件.

例如:

<label><input type="checkbox" depends_on="foo=5" name="boo" ... /> Check </label>
<select name="foo" ... >
  <option value="5" selected="selected">5</option>
  <option value="15">15</option>
  <option value="25">25</option>
</select>

因此,只有在下面选择“5”选项时才会启用该复选框.

要么

<select name="foo" depends_on="boo" ... >
  <option value="5" selected="selected">5</option>
  <option value="15">15</option>
  <option value="25">25</option>
</select>

<label><input type="checkbox" name="boo" ... /> Check </label>

在这种情况下,只有在选中“boo”时才应启用选择.

我设法提出了一个类似这样的代码:

$("*[depends_on]").each(function(){

  var source = $(this);
  var dep = $(this).attr('depends_on');
  var target = dep.split("=");

  $("*[name='"+target[0]+"']:not(:hidden)").change(function(){
    if($(this).attr('checked')) {
     source.removeClass('disabled');
     source.removeAttr('disabled');
    }
    else{
     source.attr('disabled', 'disabled');
     source.addClass('disabled');
    }

  }).change();

});

似乎适用于依赖无线电的选择,但我想为任何类型的输入或组合(或至少大多数)实现这一点,而不必为每种类型的输入编写单独的代码.

无论如何,是否有人知道这样的插件?或者对我上面的代码有建议? 🙂

最佳答案
干得好 :-)

http://jsfiddle.net/balupton/cxcmf/

(function($){
    /**
     * jQuery.fn.dependsOn
     * @version 1.0.1
     * @date September 22, 2010
     * @since 1.0.0, September 19, 2010
     * @package jquery-sparkle {@link http://www.balupton/projects/jquery-sparkle}
     * @author Benjamin "balupton" Lupton {@link http://www.balupton.com}
     * @copyright (c) 2010 Benjamin Arthur Lupton {@link http://www.balupton.com}
     * @license Attribution-ShareAlike 2.5 Generic {@link http://creativecommons.org/licenses/by-sa/2.5/
     */
    $.fn.dependsOn = function(source,value){
        var $target = $(this),
            $source = $(source),
            source = $source.attr('name')||$source.attr('id');

        // Add Data
        var dependsOnStatus = $target.data('dependsOnStatus')||{};
        dependsOnStatus[source] = false;
        $target.data('dependsOnStatus',dependsOnStatus);

        // Add Event
        $source.change(function(){
            var pass = false;
            var $source = $(this); // so $source won't be a group for radios

            // Determine
            if ( (value === null) || (typeof value === 'undefined') ) {
                // We don't have a value
                if ( $source.is(':checkbox,:radio') ) {
                    pass = $source.is(':selected:enabled,:checked:enabled');
                }
                else {
                    pass = Boolean($source.val());
                }
            }
            else {
                // We do have a value
                if ( $source.is(':checkbox,:radio') ) {
                    pass = $source.is(':selected:enabled,:checked:enabled') && ($source.val() == value);
                }
                else {
                    pass = $source.val() == value;
                }
            }

            // Update
            var dependsOnStatus = $target.data('dependsOnStatus')||{};
            dependsOnStatus[source] = pass;
            $target.data('dependsOnStatus',dependsOnStatus);

            // Determine
            var passAll = true;
            $.each(dependsOnStatus, function(i,v){
                if ( !v ) {
                    passAll = false;
                    return false; // break
                }
            });
            // console.log(dependsOnStatus);

            // Adjust
            if ( !passAll ) {
                $target.attr('disabled','disabled').addClass('disabled');
            }
            else {
                $target.removeAttr('disabled').removeClass('disabled');
            }
        }).trigger('change');

        // Chain
        return this;
    };


})(jQuery);

举个例子:

使用Javascript:

    $(function(){
        $('#foo').dependsOn('#boo').dependsOn('#moo','test')
            .dependsOn(":radio[name=doo]",'true');
    });

HTML:

<div>
    <select name="foo" id="foo" >
        <option value="5" selected="selected">5</option>
        <option value="15">15</option>
        <option value="25">25</option>
    </select>
    <input type="text" name="moo" id="moo" />
    <input type="checkbox" name="boo" id="boo" />
    <input type="radio" name="doo" value="false" />
    <input type="radio" name="doo" value="true" />
    <br/>
    Type test in the textbox and check the checkbox to enable the select.
    <br/>
    By <a href="http://www.balupton.com" target="_blank">Benjamin "balupton" Lupton</a>, for <a href="https://stackoverflow.com/q/3731586/130638" target="_blank">a StackOverflow Question</a>
</div>

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