Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You need a function to get the <a href="http://www.quirksmode.org/js/findpos.html" rel="noreferrer">position of the canvas element</a>:</p> <pre><code>function findPos(obj) { var curleft = 0, curtop = 0; if (obj.offsetParent) { do { curleft += obj.offsetLeft; curtop += obj.offsetTop; } while (obj = obj.offsetParent); return { x: curleft, y: curtop }; } return undefined; } </code></pre> <p>And calculate the current position of the cursor relative to that:</p> <pre><code>$('#canvas').mousemove(function(e) { var pos = findPos(this); var x = e.pageX - pos.x; var y = e.pageY - pos.y; var coordinateDisplay = "x=" + x + ", y=" + y; writeCoordinateDisplay(coordinateDisplay); }); </code></pre> <p>The values of <code>offsetLeft</code> and <code>offsetTop</code> are relative to <code>offsetParent</code>, which is your <code>div</code> node. When you remove the <code>div</code> they're relative to the <code>body</code>, so there is no offset to subtract.</p> <p>Similary, <code>e.pageX</code> and <code>e.pageY</code> give the position of the cursor relative to the document. That's why we subtract the canvas's offset from those values to arrive at the true position.</p> <p>An alternative for <em>positioned</em> elements is to directly use the values of <code>e.layerX</code> and <code>e.layerY</code>. This is less reliable than the method above for two reasons:</p> <ol> <li>These values are also relative to the entire document when the event does not take place inside a positioned element</li> <li>They are not part of any standard</li> </ol>
    singulars
    1. This table or related slice is empty.
    1. POTracking mouse position in canvas when no surrounding element exists
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USWayne Burkett
    1. USWayne Burkett
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POTracking mouse position in canvas when no surrounding element exists
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COCould these coordinates be stored clientside in a file that is not cleared after each session?
      singulars
      1. PO
      1. USHCAI
    2. COSure. Put them in a cookie or local storage.
      singulars
      1. PO
      1. USWayne Burkett
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload