如何使用 JQuery 监听 RadioGroup 选定值的更改？

发布于 2024-09-30 16:10:46 字数 1808 浏览 5 评论 0原文

我需要为一组单选按钮注册一个处理程序。我正在使用 JQuery 并希望它的 .change 方法能够完成此任务。但是我没有经历过期望的行为。

这是我编写的示例片段。遗憾的是，“radioValueChanged”仅在初始加载时被调用。选择 true / false 不会触发处理程序。

<html>
<script src="jquery-1.4.2.min.js" type="text/javascript"></script>

<form id="myForm">
    <div id="Question1Wrapper">
        <div>
            <input type="radio" name="controlQuestion" id="valueFalse" value="0" />
            <label for="valueFalse">
                False</label>
        </div>
        <div>
            <input type="radio" name="controlQuestion" id="valueTrue" value="1" />
            <label for="valueTrue">
                True</label>
        </div>
    </div>
    <div id="Question2Wrapper">
        <div>
            <label for="optionalTextBox">
                This is only visible when the above is true</label>
            <input type="text" name="optionalTextBox" id="optionalTextBox" value="" />
        </div>
    </div>

    <script type="text/javascript">
        jQuery(document).ready(function ()
        {
            $("#controlQuestion").change(radioValueChanged('controlQuestion'));
        })

        function radioValueChanged(radioName)
        {
            radioValue = $('input[name=' + radioName + ']:checked', '#myForm').val();

            alert(radioValue);

            if(radioValue == 'undefined' || radioValue == "0")
            {
                $('#Question2Wrapper:visible').hide();
            }
            else
            {
                $('#Question2Wrapper:visible').show();
            }
        } 
    </script>
</form>

原文

I need to register a handler for a group of radio buttons. I'm using JQuery and hoped that its .change method would accomplish this. However I have not experienced the desired behavoir.

Here is a sample snippet I've written. Sadly, the "radioValueChanged" is only called on the initial load. Selecting either true / false does not trigger the handler.

<html>
<script src="jquery-1.4.2.min.js" type="text/javascript"></script>

<form id="myForm">
    <div id="Question1Wrapper">
        <div>
            <input type="radio" name="controlQuestion" id="valueFalse" value="0" />
            <label for="valueFalse">
                False</label>
        </div>
        <div>
            <input type="radio" name="controlQuestion" id="valueTrue" value="1" />
            <label for="valueTrue">
                True</label>
        </div>
    </div>
    <div id="Question2Wrapper">
        <div>
            <label for="optionalTextBox">
                This is only visible when the above is true</label>
            <input type="text" name="optionalTextBox" id="optionalTextBox" value="" />
        </div>
    </div>

    <script type="text/javascript">
        jQuery(document).ready(function ()
        {
            $("#controlQuestion").change(radioValueChanged('controlQuestion'));
        })

        function radioValueChanged(radioName)
        {
            radioValue = $('input[name=' + radioName + ']:checked', '#myForm').val();

            alert(radioValue);

            if(radioValue == 'undefined' || radioValue == "0")
            {
                $('#Question2Wrapper:visible').hide();
            }
            else
            {
                $('#Question2Wrapper:visible').show();
            }
        } 
    </script>
</form>

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时光暖心i 2024-10-07 16:10:46

这里有几个问题。

您将在脚本执行后立即运行 radioValueChanged('controlQuestion')，因为这是方法调用而不是函数赋值。
选择器 $("#controlQuestion") 错误，您没有任何 id 为 controlQuestion 的元素。
radioValueChanged 方法未正确处理值，因为它们将传递给 jQuery 事件处理程序。

您可以尝试如下操作：

jQuery(document).ready(function ()
    {
        $("input[name='controlQuestion']").change(radioValueChanged);
    })

    function radioValueChanged()
    {
        radioValue = $(this).val();

        alert(radioValue);

        if($(this).is(":checked") && radioValue == "0")
        {
            $('#Question2Wrapper').hide();
        }
        else
        {
            $('#Question2Wrapper').show();
        }
    }

老实说，我不确定这是否是您在 if 语句中寻找的实际逻辑，但希望这将为您提供纠正当前代码的基础。

There are a few issues here.

You are immediately running radioValueChanged('controlQuestion') upon script execution because that is a method call and not a function assignment.
The selector $("#controlQuestion") is wrong, you don't have any elements with id of controlQuestion.
The radioValueChanged method is not properly handling values as they would be passed to a jQuery event handler.

You could try something like the following:

jQuery(document).ready(function ()
    {
        $("input[name='controlQuestion']").change(radioValueChanged);
    })

    function radioValueChanged()
    {
        radioValue = $(this).val();

        alert(radioValue);

        if($(this).is(":checked") && radioValue == "0")
        {
            $('#Question2Wrapper').hide();
        }
        else
        {
            $('#Question2Wrapper').show();
        }
    }

In all honesty I'm not sure if that is the actual logic you are looking for with the if statement, but hopefully this will provide a basis for you to correct the current code.

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