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Thread: detect which div the mouse is hoovered over

  1. #1
    Join Date
    Jan 2007
    Posts
    110

    detect which div the mouse is hoovered over

    Hi, I have a site that has multiple divs. I would like to add onmouseover or onclick event for
    each div. My problem is how can I use Javascript or Jquery to detect which div the user clicks on or hoover over, it seem like a chicken or eggs dilemma. Any suggestions will be greatly appreciated. If it's possible, I would prefer not to have an id for each div.

  2. #2
    Join Date
    Dec 2005
    Location
    FL
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    Question

    If you don't want to use an 'id' for each div (why not?)
    then how do you plan on identifying which <div> is being hovered over?

    What is to be evaluated and/or displayed when the hover occurs?

    Show some code, even if it is only the HTML portion.
    What does the layout look like?

  3. #3
    Join Date
    Dec 2005
    Location
    FL
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    Lightbulb

    Note: I can be done with no JS at all...
    Code:
    <!DOCTYPE HTML>
    <html>
    <head>
    <title> Untitled </title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <style type="text/css">
     div { height:50px; width:150px; border:5px solid red; margin:10px; 5px; }
    </style>
    
    </head>
    <body>
    <div title="div1">Div 1 information</div>
    <div title="div2">Div 2 information</div>
    <div title="div3">Div 3 information</div>
    <div title="div4">Div 4 information</div>
    <div title="div5">Div 5 information</div>
    
    </body>
    </html>

  4. #4
    Join Date
    Jan 2007
    Posts
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    I was thinking using other attributes such as top, left.
    Now let say I want to use id, if I do it like this <div id="a"> now how do I use JQuery to find a when the mouseover. I use the to get the value but it does not work. alert($('div').attr('id')) I thought this will return "a" but it comes out undefined.

  5. #5
    Join Date
    Jan 2007
    Posts
    110
    Please excuse the unclear last post
    I was thinking using other attributes such as top, left.
    Now let say I want to use id, if I do it like this
    <html>
    <div id="a">
    <div id="b">
    </html>
    now how do I use JQuery to find a div with onclick or onmouseover, I tried several ways from googling, the
    all returns a list of all divs, what I really want is it returns the one div that's mouseover, if over a returns a,
    if over b then returns b.

  6. #6
    Join Date
    Dec 2005
    Location
    FL
    Posts
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    Lightbulb

    Modify to your heart's content...
    Code:
    <!DOCTYPE HTML>
    <html>
    <head>
    <title> Untitled </title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    
    <style type="text/css">
     div { height:50px; width:150px; border:5px solid red; margin:10px; 5px; }
     #hoverSpan { ; }
    </style>
    
    </head>
    <body>
    <span id="hoverSpan">
     <div>Div 1 information</div>
     <div>Div 2 information</div>
     <div>Div 3 information</div>
     <div>Div 4 information</div>
     <div>Div 5 information</div>
    </span>
    
    <script type="text/javascript">
    ( function () {
      var sel = document.getElementById('hoverSpan').getElementsByTagName('div');
      for (var i=0; i<sel.length; i++) {
        sel[i].id = 'div'+i;
        sel[i].onclick = function() { showID(this.id); }
      }
      function showID(info) { alert('This div has an ID of: '+info); }
    } )();
    </script>
    
    </body>
    </html>
    Good Luck!

  7. #7
    Join Date
    Jul 2008
    Location
    urbana, il
    Posts
    2,787
    if there are lots of divs, it's faster and simpler to use event delegation than manually binding each one:

    Code:
    <body>
    <span id="hoverSpan">
     <div id=i1>Div 1 information</div>
     <div id=i2>Div 2 information</div>
     <div id=i3>Div 3 information</div>
     <div id=i4>Div 4 information</div>
     <div id=i5>Div 5 information</div>
    </span>
    
    <script type="text/javascript">
    
      hoverSpan.addEventListener("mouseover", 
      function showID(e) { 
           var targ=e.target||e.srcElement||{}; 
           if(targ.id) alert('This div has an ID of: '+targ.id); 
     }, true );
    
    </script>

  8. #8
    Join Date
    Dec 2005
    Location
    FL
    Posts
    7,440

    Arrow

    I don't know if there is much difference in OP's final project.

    I tried to solve problem with initial request to not use IDs if possible.

    But he/she may have changed their mind from initial posting.


  9. #9
    Join Date
    Jan 2007
    Posts
    110
    Thank you all for your replies.

    The reason I don't want to use id is because I am working on a data visualization project. I use the jsDraw2D library, the project requires a lot of circles depends on how much data are read. I try not to hack the library too much by adding ids to the jsDraw2D.js. So I thought I could use other arttributes such astop, left color, radius etc.

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