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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