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I am loading a .js file I wrote. Within that .js file I am creating a Iframe like this

var frmSource = "http://MYLINK.com/mypage.php?" + encodeURI(URLBuilder);
ifrm = document.createElement("IFRAME");
ifrm.setAttribute("src", frmSource);a
ifrm.style.width = 0+"px";
ifrm.style.height = 0+"px";
ifrm.setAttribute("frameBorder", "0");
document.body.appendChild(ifrm);
URLBuilder contains the GET variables to the next page

The issue occurs at document.body.appendChild(ifrm);
and my error is 
javascript typeerror: null is not an object (evaluating 'document.body.appendchild')
I suspect the issue is it is trying to append the iframe to the body but the body has not properly loaded. I am currently only getting this issue in safari.
I have done something like this to configure my IFrame creation and it is working fine  
 var urlWithParam = url + encodeURI(URLBuilder)
        var iframe = document.createElement('iframe');
        iframe.src = urlWithParam;
        iframe.id = "iframe_" + done;
        iframe.style.position = "relative";
        iframe.style.height = "100%";
        iframe.style.width = "100%";
        iframe.style.top = "0";
        iframe.style.left = "0";
        iframe.style.right = "0";
        iframe.style.bottom = "0";
        iframe.style.frameBorder = "0";
        iframe.style.borderStyle = "none";
        iframe.style.display = "none;";
        //if you want to do something after the Iframe load
        iframe.onload = function(event) {
                I am marking this one correct. It is the closest to what I implemented.   I ended up editing the code I provided above to this and seems to work every time           window.onload = function() {         CODE here         };
– Emanuel Permane
                Feb 16, 2015 at 21:28
        
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