I tried to detect which mouse button -if any- is the user pressing during a mousemove event under jQuery, but I'm getting ambiguous results:
no button pressed: e.which = 1 e.button = 0 left button pressed: e.which = 1 e.button = 0 middle button pressed: e.which = 2 e.button = 1 right button pressed: e.which = 3 e.button = 2
Code:
<!DOCTYPE html> <html> <head> <script src="http://code.jquery.com/jquery-latest.min.js"></script> </head> <body> <input id="whichkey" value="type something"> <div id="log"></div> <script>$('#whichkey').bind('mousemove',function(e){ $('#log').html(e.which + ' : ' + e.button ); }); </script> </body> </html>
How can I tell the difference between left mouse button pressed and no button at all?
You can write a bit of code to keep track of the state of the left mouse button, and with a little function you can pre-process the event variable in the mousemove
event.
To keep track of the state of the LMB, bind an event to document level for mousedown
and mouseup
and check for e.which
to set or clear the flag.
The pre-processing is done by the tweakMouseMoveEvent()
function in my code. To support IE versions < 9, you have to check if mouse buttons were released outside the window and clear the flag if so. Then you can change the passed event variable. If e.which
was originally 1 (no button or LMB) and the current state of the left button is not pressed, just set e.which
to 0
, and use that in the rest of your mousemove
event to check for no buttons pressed.
The mousemove
handler in my example just calls the tweak function passing the current event variable through, then outputs the value of e.which
.
$(function() { var leftButtonDown = false; $(document).mousedown(function(e){ // Left mouse button was pressed, set flag if(e.which === 1) leftButtonDown = true; }); $(document).mouseup(function(e){ // Left mouse button was released, clear flag if(e.which === 1) leftButtonDown = false; }); function tweakMouseMoveEvent(e){ // Check from jQuery UI for IE versions < 9 if ($.browser.msie && !e.button && !(document.documentMode >= 9)) { leftButtonDown = false; } // If left button is not set, set which to 0 // This indicates no buttons pressed if(e.which === 1 && !leftButtonDown) e.which = 0; } $(document).mousemove(function(e) { // Call the tweak function to check for LMB and set correct e.which tweakMouseMoveEvent(e); $('body').text('which: ' + e.which); }); });
Try a live demo here: http://jsfiddle.net/G5Xr2/
Most browsers (except Safari) *) now support the MouseEvent.buttons
property (note: plural "buttons"), which is 1 when the left mouse button is pressed:
$('#whichkey').bind('mousemove', function(e) { $('#log').html('Pressed: ' + e.buttons); });
https://jsfiddle.net/pdz2nzon/2
*) The world is moving forward:
https://webkit.org/blog/8016/release-notes-for-safari-technology-preview-43/
https://trac.webkit.org/changeset/223264/webkit/
https://bugs.webkit.org/show_bug.cgi?id=178214
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