JavaScript simple to determine whether the check box is checked and removed the value of the method _javascript tips

The example in this article describes how JavaScript simple judgments check boxes are selected and the values are removed. Share to everyone for your reference. Specifically as follows:

Here, using JavaScript to get the value of the checkbox, a friend usually encounters a particular element in the form when they start using the form to submit data-check box to determine if it is selected and to get its value, as if it were somewhat different from other form elements, This code will show you how to get the value of the check box and determine if it is selected.

The effect is as shown in the following illustration:

The specific code is as follows:

<title>javascript gets the value of the check box </title>
<script>
function checkbox ()
{
var str= Document.getelementsbyname ("box");
var objarray=str.length;
var chestr= "";
for (i=0;i<objarray;i++)
{
 if (str[i].checked = = True)
 {
  chestr+=str[i].value+ ",";
 }
}
if (chestr = "")
{
 alert ("Select check box First ~! ");
}
else
{
 alert (the value of the check box is: "+chestr);
}
}
</script>
Choose your expertise:
<input type= "checkbox" name= "box" id= "Box1" value= "ASP"/>asp
< Input type= "checkbox" name= "box" id= "Box2" value= "PHP"/>php <input "
checkbox" type= "box" name= "id=" Value= "JSP"/>jsp <input type= "button" name= "button" id= "
button" onclick= "checkbox ()" value= "Submit"/>

I hope this article will help you with your JavaScript programming.