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JavaScript check checkbox checkbox is checked

Source: Internet
Author: User
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Let's say there's a checkbox named CheckBox1 on the Web page with a form,form named Form1.

The code is as follows

var f = document.form1;
var sum=0;
if (f.checkbox1.length) {
for (var i=0;i <f.checkbox1.length;i++) {
if (f.checkbox1[i].checked==true)
sum=sum+1;
}
}else{
if (f.checkbox1.checked) {
Sum=1;
}
}
Console.log (sum);

Note that the outermost if judgment, f.checkbox1.length returns undefined when there is only one checkbox item.

Look at one more.

The code is as follows

<script>
function test ()
{
var x=document.getelementsbyname ("enjoy[]");
var Issel=false;
for (Var i=0;i<x.length;i++)
{
if (x[i].checked)
{
Issel=true;
return Issel;
}
}
return Issel;
}
</script>
<body>
<form id= "Form1" Name= "Form1" method= "Post" action= "" >

<input type= "checkbox" Name= "enjoy[]" id= "enjoy["/>
Eat
<input type= "checkbox" Name= "enjoy[]" id= "enjoy["/>
Drink

<input type= "Submit" name= "button" id= "button" onclick= "Alert (Test ());" value= "Submit"/>
</form>

Get to the selected checkbox there are several, the next operation will not be more introduced it.

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Related Keywords:
checkbox php checked php set checkbox checked checkbox checked php code php checkbox checked asp checkbox checked php checkbox checked from database multiple checkbox checked in php
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