9-4 全选为什么无法实现
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gkb">
<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");
for(var m=0;m<hobby.length;m++){
if(hobby[m].type=="checked"){
hobby[m].checked=true;
}
}
// 任务1
}
function clearall(){
var hobby = document.getElementsByName("hobby");
for(var i=0;i<hobby.length;i++){
hobby[i].checked=false;
}
// 任务2
}
function checkone(){
var j=document.getElementById("wb").value;
if(j>0 && j<=6){
document.getElementById('hobby'+j).checked=true;
}
// 任务3
}
</script>
</body>
</html>
个回答
-
- qq_夏佐_0
- 2018-11-29 14:32:05
j 需要转一下：parseInt(j)
看我代码：
<!DOCTYPE HTML>
<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"> 1.音乐
<input type="checkbox" name="hobby" id="hobby2"> 2.登山
<input type="checkbox" name="hobby" id="hobby3"> 3.游泳
<input type="checkbox" name="hobby" id="hobby4"> 4.阅读
<input type="checkbox" name="hobby" id="hobby5"> 5.打球
<input type="checkbox" name="hobby" id="hobby6"> 6.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");
for (var i=0;i<hobby.length;i++) {
if (hobby[i].type =="checkbox") {
hobby[i].checked = 'checked';
}
}
}
function clearall(){
var hobby = document.getElementsByName("hobby");
for (var i=0;i<hobby.length;i++) {
if (hobby[i].checked == true) {
hobby[i].checked = false;
}
}
}
function checkone(){
var j = document.getElementById("wb").value;
var tag = document.getElementsByTagName("input");
var CheckedNum = parseInt(j);
if (CheckedNum > 0 && CheckedNum <=6) {
tag[CheckedNum-1].checked = 'checked';
}else {
alert("请输入正确的选项:(1-6)");
}
}
</script>
</body>
</html>
-
- 慕粉3852729
- 2018-10-13 16:07:13
var hobby = document.getElementsByTagName("input");
console.log(hobby);打印一下
你试试这个：
function checkall(){
var hobby = document.getElementsByTagName("input");
console.log(hobby);
// 任务1
for(var i = 0; i < hobby.length; i++){
if(hobby[i].attributes.type.value == 'checkbox'){
hobby[i].checked = true;
}
}
}