Check Box Problem

[divyakgowda]

Hello all,
My problem,i have written a javascript to check whether the checkboxes are checked or not.If its not checked,i will get an alert message,if i checked then say it is checked.This condition is working for more than one data.If there is only one data and if i check that also,i am gettin an alert message and says its not checked.Please help me to solve this.

Javascript am using is,

    var total=""
        for(var i=0; i < document.formname.field_id.length; i++)
        {
            if(document.formname.field_id[i].checked)
               total +=document.formname.field_id[i].value + "\n"
        }
 
       if(total=="")
        {
            alert("Please select one data") 
            return false; 
        }

[Dormilich]

I think that's because you get the field by "document.formname.field_id", which in this case returns a HTMLInputElement (an element node, that doesn't have the length property) instead of a HTMLCollection (several elements with the same name - an element node-set).

to overcome this use the DOM method getElementsByName() which always returns a node-set.

[dmjpro]

I think your CheckBox has the same name then you better to do ...

var check_boxes = document.getElementsByName("checkbox_name");
for(var i=0;i<check_boxes.length;i++){
 var checkbox_ref = check_boxes[i];
 //do whatever you want to do with the reference
}
 

Actually document.formName.elementName.length does not work when the element is single ;)