JavaScript 如何获得所选单选按钮的值?

我的JS程序遇到一些奇怪的问题。我的工作正常,但由于某种原因,它不再工作。我只想查找单选按钮的值(已选中该按钮)并将其返回给变量。由于某种原因,它不断返回undefined

这是我的代码:

function findSelection(field) {

var test = 'document.theForm.' + field;

var sizes = test;

alert(sizes);

for (i=0; i < sizes.length; i++) {

if (sizes[i].checked==true) {

alert(sizes[i].value + ' you got a value');

return sizes[i].value;

}

}

}

submitForm

function submitForm() {

var genderS = findSelection("genderS");

alert(genderS);

}

HTML:

<form action="#n" name="theForm">

<label for="gender">Gender: </label>

<input type="radio" name="genderS" value="1" checked> Male

<input type="radio" name="genderS" value="0" > Female<br><br>

<a href="javascript: submitForm()">Search</A>

</form>

回答:

您可以执行以下操作:

var radios = document.getElementsByName('genderS');

for (var i = 0, length = radios.length; i < length; i++) {

if (radios[i].checked) {

// do whatever you want with the checked radio

alert(radios[i].value);

// only one radio can be logically checked, don't check the rest

break;

}

}

<label for="gender">Gender: </label>

<input type="radio" name="genderS" value="1" checked="checked">Male</input>

<input type="radio" name="genderS" value="0">Female</input>

编辑:感谢HATCHA和jpsetung的编辑建议。

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