Problem creating pic-viewer with pure JavaScript_问答_开发者

Problem creating pic-viewer with pure JavaScript

开发者 https://www.devze.com 2023-04-06 06:53 出处：网络

I\'m learning the basics of JavaScript in a course at school. This because I want to have a big understanding of JavaScript when I\'m diving into different libraries.

相关专题：javascript

I'm learning the basics of JavaScript in a course at school. This because I want to have a big understanding of JavaScript when I'm diving into different libraries.

I've successfully managed to create a function who spawn a <div> that is hidden with a picture within it (I've cheated with "the pure" JavaScript with the fadeIn function as you see).

The problem now is that i want the function to be dynamic and work for more than just one element. I don't now how to proceed with this problem.

Any help or thoughts will be appreciated.

    <div id="hiddenElement">
        <img src="#" alt="image" class="maxImg"/>
    </div>

    var hiddenElement = document.getElementById('hiddenElement');
    anchor.addEventListener('click', spawnImage, false);


    function spawnImage() {
            $(hiddenElement).fadeIn('slow', function() {
                hiddenElement.style.display = 'block';
            });

looks like开发者_如何学JAVA this now: http://oscarlandstrom.se/javascript/pic.html

Do you mean you want to unify this function?Then you can pass div and back ids as function parametrs:

function spawnImage(divId, backId) {
            $(divId).fadeIn('slow', function() {
                document.getElementById('divId').style.display = 'block';
            });
            $(backId).fadeIn('slow', function() {
                document.getElementById('backId').style.display = 'block';
            });

When you load page call something like that:

spawnImage(fistDivId, backId);
spawnImage(secondDivId, backId);

So you can set class="spawn" for all elements you want your function hold. (class="spawn" - it is empty class used just to mark elements). Then you should set on load event like:

$(document).ready(function() {
  var spawnedElamants = getElementsByClassName("spawn");
  for(var i=0; i<spawnedElamants.length; i++)
  {
    spawnImage(spawnedElamants[i].id, backId);
  }
});

Check that:

<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" type="text/css" href="sheet.css" />
        <script src="js.js"></script>
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>

    </head>
    <body>
        <div id="bkgFade"></div>
        <div id="container">
            <div class="imgWrap">
                <img src="http://www.morrharet.se/images/morrharet.jpg" alt="image" id="anchor" class="minImg"/>
            </div>
            <div class="imgWrap">
                <img src="http://www.morrharet.se/images/morrharet.jpg" alt="image" id="anchor2" class="minImg"/>
            </div>
        </div>
        <div id="hiddenElement">
            <img src="http://www.morrharet.se/images/morrharet.jpg" alt="image" class="maxImg"/>
        </div>
    </body>
</html>
<script type="text/javascript">
    $(document).ready(function() {
        var minImgs = document.getElementsByClassName("minImg");
        var maxImgs = document.getElementsByClassName("maxImg");
        var bkgFade = document.getElementById('bkgFade');
        for(var i=0; i<minImgs.length; i++)
        {
            minImgs[i].addEventListener('click', spawnImage, false);    
        }
        for(var i=0; i<maxImgs.length; i++)
        {
            maxImgs.addEventListener('click', despawnImage, false);
        }
        }
    )

    function spawnImage() {
        $(hiddenElement).fadeIn('slow', function() {
            hiddenElement.style.display = 'block';
        });

        $(bkgFade).fadeIn('slow', function() {  
            bkgFade.style.display = 'block';

        });
    }

    function despawnImage() {
        $(hiddenElement).fadeOut('slow', function() {
            document.getElementById('hiddenElement').style.display = 'none';
        });
        $(bkgFade).fadeOut('slow', function() {
            document.getElementById('bkgFade').style.display = 'none';

        });
    }
</script>