Positioning an element under another element in Javascript

Question

Positioning an element under another element in Javascript

I am trying to create a dialog box similar to the one that appears when I click the "flag" link here on SO (without using jQuery or any other library).

The code below displays a dialog box when you click the Show Dialog link. The code works very well, except that when you resize the page, the dialog box does not appear under the link, how can I fix this?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Test</title>
<script type="text/javascript">

function ShowDialog(link)
{
  var dlgID = "popupDialog";
  if(!document.getElementById(dlgID))
  {
    dialog = document.createElement("div");
    dialog.id = dlgID;
    dialog.style.position = "absolute";
    dialog.style.width =  "200px";
    dialog.style.zIndex = "100";
    dialog.style.padding = "10px";
    dialog.style.backgroundColor = "#FF0000";
    dialog.innerHTML = 
      "Violation Type:<br />" +
      "<input type='radio' id='Option1' name='ViolationType' checked='checked' /><label for='Option1'> Option 1</label><br />" +
      "<input type='radio' id='Option2' name='ViolationType' /><label for='Option2'> Option 2</label><br />" +
      "<input type='radio' id='Option3' name='ViolationType' /><label for='Option3'> Option 3</label><br />" +
      "<input type='radio' id='Option4' name='ViolationType' /><label for='Option4'> Option 4</label>" +
      "<p style='text-align:right;margin-top:10px;'><input type='button' value='OK' /> <input type='button' value='Cancel' /></p>";
    document.body.appendChild(dialog);
  }
  else
  {
    dialog = document.getElementById(dlgID);
  }

  dialog.style.visibility = "visible";
  dialog.style.left = getX(link) + "px";
  dialog.style.top = getY(link) + link.offsetHeight + "px";
}

function getY(oElement)
{
  var iReturnValue = 0;
  while (oElement != null)
  {
    iReturnValue += oElement.offsetTop;
    oElement = oElement.offsetParent;
  }
  return iReturnValue;
}

function getX(oElement)
{
  var iReturnValue = 0;
  while (oElement != null)
  {
    iReturnValue += oElement.offsetLeft;
    oElement = oElement.offsetParent;
  }
  return iReturnValue;
}

</style>
</head>
<body>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Proin enim diam, imperdiet eget, luctus eget, rhoncus vel, lacus. Maecenas ipsum nulla, pretium vel, vehicula a, tincidunt luctus, dui. Donec adipiscing. Sed aliquet, lorem id porttitor vestibulum, libero pede pretium sem, id iaculis mauris ante a orci. Etiam mi felis, adipiscing nec, aliquet vel, hendrerit non, libero. Curabitur posuere pede vitae enim. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Proin sem. Pellentesque iaculis. Morbi at tellus a velit venenatis tempor. Vivamus quam augue, commodo sed, dapibus nec, posuere in, augue. Mauris ultrices. Integer fringilla turpis et dui. Quisque varius elementum ipsum. Aenean pede. Sed vestibulum condimentum ipsum.<br />
Lorem ipsum dolor sit amet <a href="#" onclick="ShowDialog(this);return false;">Show Dialog</a><br />Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Proin enim diam, imperdiet eget
</body>
</html>

+3

javascript dhtml

123 May 08 '09 at 10:24

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1 answer

Jose Basilio · Answer 1 · 2009-05-08T10:42:26+0000

Here is a “hack” that works very well in this scenario. Just fire the click event for the link inside the window.onresize () event.

script :

<script type="text/javascript">
var myLink;
window.onresize = function()
{
   myDialog = document.getElementById("popupDialog");
   if(myDialog && myDialog.style.visibility == "visible")
   {         
      myLink.fireEvent("onclick");
   }
}
function ShowDialog(link)
{
  myLink = link;
  var dlgID = "popupDialog";
  if(!document.getElementById(dlgID))
  {
    dialog = document.createElement("div");
    dialog.id = dlgID;
    dialog.style.position = "absolute";
    dialog.style.width =  "200px";
    dialog.style.zIndex = "100";
    .........

Positioning an element under another element in Javascript

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