键入错误：getElementById..null与h：selectBooleanCheckbox

Question

The code is working and setting the values with

setCookie('newWindow', document.getElementById("myForm:header:"+1+":chekDeleted").checked? 1:0,100);

but when i call the getElementById in loop it says type error

var count = 0;

for(i=1;i<totalRecords;i++)
{
    var chkBox = getElementById("myForm:header:"+i+":chekDeleted");
    if(chkBox.checked == true)
    {
        count++;
        if(count > 1)
        {
            setCookie('newWindow', document.getElementById("myForm:header:"+i+":chekDeleted").checked? 1:0,100);

        }
    }
}

Answer 1

Try to add document. :

for(i=1;i<totalRecords;i++)
{
        var chkBox = document.getElementById("myForm:header:"+i+":chekDeleted");
    if(chkBox.checked == true)
    {
        count++;
        if(count > 1)
        {
            setCookie('newWindow', document.getElementById("myForm:header:"+i+":chekDeleted").checked? 1:0,100);

        }
    }
}

If you still having the error, it is because the element with those ids are not loaded. in that case, chkBox returns null and if(chkBox.checked == true) returns error Uncaught TypeError: Cannot read property 'checked' of null