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JavaScript 控制单选框和复选框

nixiaole 2024-11-19 08:23:34 知识剖析 25 ℃

控制表单中的单选按钮


<html>
<head>
<title>单选项</title>
<style>
<!--
form{
padding:0px; margin:0px;
font:14px Arial;
}
p{
padding:2px; margin:0px;
}
-->
</style>
<script language="javascript">
function getChoice(){
    var oForm = document.forms["myForm1"];
    var aChoices = oForm.camera;
    for(i=0;i<aChoices.length;i++) //遍历整个单选项表
    if(aChoices[i].checked) //如果发现了被选中项则退出
    break;
    alert("您使用的相机品牌是："+aChoices[i].value);
}
function setChoice(iNum){
    var oForm = document.forms["myForm1"]; //获取表单的节点
    oForm.camera[iNum].checked = true; //设置某选项被选中
}
</script>
</head>
<body>
<form method="post" name="myForm1" action="addInfo.php">
您使用的相机品牌：
<p>
<input type="radio" name="camera" id="canon" value="Canon">
<label for="canon">Canon</label>
</p>
<p>
<input type="radio" name="camera" id="nikon" value="Nikon">
<label for="nikon">Nikon</label>
</p>
<p>
<input type="radio" name="camera" id="sony" value="Sony" checked>
<label for="sony">Sony</label>
</p>
<p>
<input type="radio" name="camera" id="olympus" value="Olympus">
<label for="olympus">Olympus</label>
</p>
<p>
<input type="radio" name="camera" id="samsung" value="Samsung">
<label for="samsung">Samsung</label>
</p>
<p>
<input type="radio" name="camera" id="pentax" value="Pentax">
<label for="pentax">Pentax</label>
</p>
<p>
<input type="radio" name="camera" id="others" value="其它">
<label for="others">others</label>
</p>
<p><input type="submit" name="btnSubmit" id="btnSubmit" value="Submit" class="btn"></p>
<p><input type="button" value="检测选中对象" onclick="getChoice();">
<input type="button" value="设置为Canon" onclick="setChoice(0);"></p>
</form>
</body>
</html>



设置复选框(全选、全不选、反选):

<html>
<head>
<title>多选项</title>
<style>
<!--
form{
padding:0px; margin:0px;
font:14px Arial;
}
p{
padding:2px; margin:0px;
}
-->
</style>
<script language="javascript">
function changeBoxes(action){
    var oForm = document.forms["myForm1"]; //可以简化为document.myForm1
    var oCheckBox = oForm.hobby;
    for(var i=0;i<oCheckBox.length;i++) //遍历每一个选项
    if(action<0) //反选
    oCheckBox[i].checked = !oCheckBox[i].checked;
    else //action为1是则全选，为0时则全不选
    oCheckBox[i].checked = action; //0等同于false,1等同于true
}
</script>
</head>
<body>
<form method="post" name="myForm1" action="addInfo.aspx">
您喜欢做的事情：
<p>
<input type="checkbox" name="hobby" id="ball" value="ball">
<label for="ball">打球</label>
</p>
<p>
<input type="checkbox" name="hobby" id="TV" value="TV">
<label for="TV">看电视</label>
</p>
<p>
<input type="checkbox" name="hobby" id="net" value="net">
<label for="net">上网</label>
</p>
<p>
<input type="checkbox" name="hobby" id="book" value="book">
<label for="book">看书</label>
</p>
<p>
<input type="checkbox" name="hobby" id="trip" value="trip">
<label for="trip">旅游</label>
</p>
<p>
<input type="checkbox" name="hobby" id="music" value="music">
<label for="music">听音乐</label>
</p>
<p>
<input type="checkbox" name="hobby" id="others" value="其它">
<label for="others">其它</label>
</p>
<p>
<input type="button" value="全选" onclick="changeBoxes(1);" />
<input type="button" value="全不选" onclick="changeBoxes(0);" />
<input type="button" value="反选" onclick="changeBoxes(-1);" />
</p>
</form>
</body>
</html>

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