终于实现了多选
qq_慕丝4482217
2020-02-24 18:41
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<form>
请选择你爱好:<br>
<input type="checkbox" name="hobby" id="hobby1"> 音乐
<input type="checkbox" name="hobby" id="hobby2"> 登山
<input type="checkbox" name="hobby" id="hobby3"> 游泳
<input type="checkbox" name="hobby" id="hobby4"> 阅读
<input type="checkbox" name="hobby" id="hobby5"> 打球
<input type="checkbox" name="hobby" id="hobby6"> 跑步 <br>
<input type="button" value = "全选" onclick = "checkall();">
<input type="button" value = "全不选" onclick = "clearall();">
<p>请输入您要选择爱好的序号，序号为1-6:</p>
<input id="wb" name="wb" type="text" >
<input name="ok" type="button" value="确定" onclick = "checkone();">
</form>
<script type="text/javascript">
function checkall(){
var hobby = document.getElementsByTagName("input");
// 任务1
for(var i = 0;i<hobby.length;i++){
hobby[i].checked = true;
}
}
function clearall(){
var hobby = document.getElementsByName("hobby");
// 任务2
for(var i = 0;i<hobby.length;i++){
hobby[i].checked = false;
}
}
function checkone(){
var j=document.getElementById("wb").value;
var hobby = document.getElementsByName("hobby");
var selNum=parseInt(j)-1;
hobby[selNum].checked=true;
</script>
</body>
</html>
3回答
-
- 慕村6055097
- 2020-04-21 14:25:53
function checkall(){
var hobby = document.getElementsByTagName("input");
for(var i = 0; i < hobby.length; i++){
if(hobby[i].name == "hobby"){
hobby[i].checked = true;
}
}
}
function clearall(){
var hobby = document.getElementsByName("hobby");
for(var i = 0; i < hobby.length; i++){
if(hobby[i].name == "hobby"){
hobby[i].checked = false;
}
}
}
function checkone(){
var j=document.getElementById("wb").value;
var hobby = document.getElementById("hobby" + j);
if(hobby){
hobby.checked = true;
}else{
alert("没有改选项");
}
}
-
- qq_心葬天簌_0
- 2020-03-06 14:46:16
parseInt(j)-1这个可以解释一下吗
-
- JJLinNNnnn
- 2020-02-26 10:24:49
好，跟我一样的思路
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