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2013-02-02T21:09:03.833
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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 <code>mousemove</code> event. To keep track of the state of the LMB, bind an event to document level for <code>mousedown</code> and <code>mouseup</code> and check for <code>e.which</code> to set or clear the flag. The pre-processing is done by the <code>tweakMouseMoveEvent()</code> 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 <code>e.which</code> was originally 1 (no button or LMB) and the current state of the left button is not pressed, just set <code>e.which</code> to <code>0</code>, and use that in the rest of your <code>mousemove</code> event to check for no buttons pressed. The <code>mousemove</code> handler in my example just calls the tweak function passing the current event variable through, then outputs the value of <code>e.which</code>. <pre><code>$(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); }); }); </code></pre> Try a live demo here: <a href="http://jsfiddle.net/G5Xr2/">http://jsfiddle.net/G5Xr2/</a>
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