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    Element.scrollHeight

    « Element

    The Element.scrollHeight read-only attribute is a measurement of the height of an element's content including content not visible on the screen due to overflow. The scrollHeight value is equal to the minimum clientHeight the element would require in order to fit all the content in the viewpoint without using a vertical scrollbar. It includes the element padding but not its margin.

    This property will round the value to an integer. If you need a fractional value, use Element.getBoundingClientRect().

    Syntax

    var intElemScrollHeight = document.getElementById(id_attribute_value).scrollHeight;
    

    intElemScrollHeight is a variable storing an integer corresponding to the scrollHeight pixel value of the element. scrollHeight is a read-only property.

    Example

    padding-top

    Gentle, individualistic and very loyal, Birman cats fall between Siamese and Persian in character. If you admire cats that are non aggressive, that enjoy being with humans and tend to be on the quiet side, you may well find that Birman cats are just the felines for you.

    Image:BirmanCat.jpgAll Birmans have colorpointed features, dark coloration of the face, ears, legs and tail.

    Cat image and text coming from www.best-cat-art.com

    padding-bottom

    LeftTopRightBottommargin-topmargin-bottomborder-topborder-bottom[if IE]><span id="MrgLeft" style="position: _fckstyle="position: _fckstyle="position: absolute; left: 8px; top: 65px; font: bold 13px Arial, sans-serif !important; writing-mode: tb-rl;">margin-left</span><span id="BrdLeft" style="position: absolute; left: 33px; top: 65px; color: white; font: bold 13px Arial, sans-serif !important; writing-mode: tb-rl;">border-left</span><span id="PdgLeft" style="position: absolute; left: 55px; top: 65px; font: bold 13px Arial, sans-serif !important; writing-mode: tb-rl;">padding-left</span><span id="PdgRight" style="position: absolute; left: 275px; top: 60px; color: black; font: bold 13px Arial, sans-serif !important; writing-mode: tb-rl; white-space: nowrap;">padding-right</span><span id="BrdRight" style="position: absolute; left: 310px; top: 65px; color: white; font: bold 13px Arial, sans-serif !important; writing-mode: tb-rl;">border-right</span><span id="MrgRight" style="position: absolute; left: 340px; top: 65px; font: bold 13px Arial, sans-serif !important; writing-mode: tb-rl;">margin-right</span><![endif]

    Image:scrollHeight.png

    Problems and solutions

    Determine if an element has been totally scrolled

    The following equivalence returns true if an element is at the end of its scroll, false if it isn't.

    element.scrollHeight - element.scrollTop === element.clientHeight

    scrollHeight Demo

    Associated with the onscroll event, this equivalence can be useful to determine whether a user has read a text or not (see also the element.scrollTop and element.clientHeight properties). For example:

    HTML

    <form name="registration">
      <p>
        <textarea id="rules">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum at laoreet magna. 
    Aliquam erat volutpat. Praesent molestie, dolor ut eleifend aliquam, mi ligula ultrices sapien, quis cursus 
    neque dui nec risus. Duis tincidunt lobortis purus eu aliquet. Quisque in dignissim magna. Aenean ac lorem at 
    velit ultrices consequat. Nulla luctus nisi ut libero cursus ultrices. Pellentesque nec dignissim enim. Phasellus 
    ut quam lacus, sed ultricies diam. Vestibulum convallis rutrum dolor, sit amet egestas velit scelerisque id. 
    Proin non dignissim nisl. Sed mi odio, ullamcorper eget mattis id, malesuada vitae libero. Integer dolor lorem, 
    mattis sed dapibus a, faucibus id metus. Duis iaculis dictum pulvinar. In nisi nibh, dapibus ac blandit at, porta 
    at arcu. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Praesent 
    dictum ipsum aliquet erat eleifend sit amet sollicitudin felis tempus. Aliquam congue cursus venenatis. Maecenas 
    luctus pellentesque placerat. Mauris nisl odio, condimentum sed fringilla a, consectetur id ligula. Praesent sem 
    sem, aliquet non faucibus vitae, iaculis nec elit. Nullam volutpat, lectus et blandit bibendum, nulla lorem congue 
    turpis, ac pretium tortor sem ut nibh. Donec vel mi in ligula hendrerit sagittis. Donec faucibus viverra fermentum. 
    Fusce in arcu arcu. Nullam at dignissim massa. Cras nibh est, pretium sit amet faucibus eget, sollicitudin in 
    ligula. Vivamus vitae urna mauris, eget euismod nunc. Aenean semper gravida enim non feugiat. In hac habitasse 
    platea dictumst. Cras eleifend nisl volutpat ante condimentum convallis. Donec varius dolor malesuada erat 
    consequat congue. Donec eu lacus ut sapien venenatis tincidunt. Quisque sit amet tellus et enim bibendum varius et 
    a orci. Donec aliquet volutpat scelerisque. Proin et tortor dolor. Ut aliquet, dolor a mattis sodales, odio diam 
    pulvinar sem, egestas pretium magna eros vitae felis. Nam vitae magna lectus, et ornare elit. Morbi feugiat, ipsum 
    ac mattis congue, quam neque mollis tortor, nec mollis nisl dolor a tortor. Maecenas varius est sit amet elit 
    interdum quis placerat metus posuere. Duis malesuada justo a diam vestibulum vel aliquam nisi ornare. Integer 
    laoreet nisi a odio ornare non congue turpis eleifend. Cum sociis natoque penatibus et magnis dis parturient montes, 
    nascetur ridiculus mus. Cras vulputate libero sed arcu iaculis nec lobortis orci fermentum.
        </textarea>
      </p>
      <p>
        <input type="checkbox" name="accept" id="agree" />
        <label for="agree">I agree</label>
        <input type="submit" id="nextstep" value="Next" />
      </p>
    </form>

    CSS

    #notice {
      display: inline-block;
      margin-bottom: 12px;
      border-radius: 5px;
      width: 600px;
      padding: 5px;
      border: 2px #7FDF55 solid;
    }
    
    #rules {
      width: 600px;
      height: 130px;
      padding: 5px;
      border: #2A9F00 solid 2px;
      border-radius: 5px;
    }

    JavaScript

    function checkReading () {
      if (checkReading.read) {
        return; 
      }
      checkReading.read = this.scrollHeight - this.scrollTop === this.clientHeight;
      document.registration.accept.disabled = document.getElementById("nextstep").disabled = !checkReading.read;
      checkReading.noticeBox.innerHTML = checkReading.read ? "Thank you." : "Please, scroll and read the following text.";
    }
    
    onload = function () {
      var oToBeRead = document.getElementById("rules");
      checkReading.noticeBox = document.createElement("span");
      document.registration.accept.checked = false;
      checkReading.noticeBox.id = "notice";
      oToBeRead.parentNode.insertBefore(checkReading.noticeBox, oToBeRead);
      oToBeRead.parentNode.insertBefore(document.createElement("br"), oToBeRead);
      oToBeRead.onscroll = checkReading;
      checkReading.call(oToBeRead);
    }

    Specification

    scrollHeight is part of the MSIE's DHTML object model. scrollHeight is part of the following specification: CSS Object Model (CSSOM) View Module.

    Browser compatibility

    Browser Lowest version
    Internet Explorer 8.0
    Firefox (Gecko) 3.0 (1.9)
    Opera ?
    Safari | Chrome | WebKit 4.0 | 4.0 | ?

    In FireFox versions earlier than 21: When an element's content does not generate a vertical scrollbar, then its scrollHeight property is equal to its clientHeight property. This can mean either the content is too short to require a scrollbar or that the the element has CSS style overflow value of visible (non-scrollable).

    See Also

    Attachments

    File Size Date Attached by
    BirmanCat.jpg
    4474 bytes 2005-08-05 20:58:50 GT
    scrollHeight.png
    13790 bytes 2005-08-12 18:46:15 GT
    Boxmodel.gif
    8973 bytes 2006-10-26 22:27:47 Majda
    venkintro-watch-int.png
    321 bytes 2005-04-12 09:59:49 Nickolay