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Position: Simplify fraction support test

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Also makes the test lazy to avoid any potential layouts/recalculations during
initialization.

Fixes #9898
Ref #9899
This commit is contained in:
Scott González 2015-03-18 10:05:36 -04:00
parent dff1c74dd4
commit 3970e8c681
1 changed files with 21 additions and 40 deletions
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61
ui/position.js
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@ -41,6 +41,26 @@ var cachedScrollbarWidth, supportsOffsetFractions,
rpercent = /%$/,
_position = $.fn.position;
// Support: IE <=9 only
supportsOffsetFractions = function() {
var element = $( "<div>" )
.css( "position", "absolute" )
.appendTo( "body" )
.offset( {
top: 1.5,
left: 1.5
} ),
support = element.offset().top === 1.5;
element.remove();
supportsOffsetFractions = function() {
return support;
};
return support;
};
function getOffsets( offsets, width, height ) {
return [
parseFloat( offsets[ 0 ] ) * ( rpercent.test( offsets[ 0 ] ) ? width / 100 : 1 ),
@ -243,7 +263,7 @@ $.fn.position = function( options ) {
position.top += myOffset[ 1 ];
// if the browser doesn't support fractions, then round for consistent results
if ( !supportsOffsetFractions ) {
if ( !supportsOffsetFractions() ) {
position.left = round( position.left );
position.top = round( position.top );
}
@ -475,45 +495,6 @@ $.ui.position = {
}
};
// fraction support test
( function() {
var testElement, testElementParent, testElementStyle, offsetLeft, i,
body = document.getElementsByTagName( "body" )[ 0 ],
div = document.createElement( "div" );
//Create a "fake body" for testing based on method used in jQuery.support
testElement = document.createElement( body ? "div" : "body" );
testElementStyle = {
visibility: "hidden",
width: 0,
height: 0,
border: 0,
margin: 0,
background: "none"
};
if ( body ) {
$.extend( testElementStyle, {
position: "absolute",
left: "-1000px",
top: "-1000px"
} );
}
for ( i in testElementStyle ) {
testElement.style[ i ] = testElementStyle[ i ];
}
testElement.appendChild( div );
testElementParent = body || document.documentElement;
testElementParent.insertBefore( testElement, testElementParent.firstChild );
div.style.cssText = "position: absolute; left: 10.7432222px;";
offsetLeft = $( div ).offset().left;
supportsOffsetFractions = offsetLeft > 10 && offsetLeft < 11;
testElement.innerHTML = "";
testElementParent.removeChild( testElement );
} )();
} )();
return $.ui.position;