jquery源码09 (6058 , 6620) css() : 样式的操作
2024-08-28 08:58:15
var curCSS, iframe,
// swappable if display is none or starts with table except "table", "table-cell", or "table-caption"
// see here for display values: https://developer.mozilla.org/en-US/docs/CSS/display
rdisplayswap = /^(none|table(?!-c[ea]).+)/,
rmargin = /^margin/,
rnumsplit = new RegExp( "^(" + core_pnum + ")(.*)$", "i" ),
rnumnonpx = new RegExp( "^(" + core_pnum + ")(?!px)[a-z%]+$", "i" ),
rrelNum = new RegExp( "^([+-])=(" + core_pnum + ")", "i" ),
elemdisplay = { BODY: "block" }, cssShow = { position: "absolute", visibility: "hidden", display: "block" },
cssNormalTransform = {
letterSpacing: 0,
fontWeight: 400
}, cssExpand = [ "Top", "Right", "Bottom", "Left" ],
cssPrefixes = [ "Webkit", "O", "Moz", "ms" ]; // return a css property mapped to a potentially vendor prefixed property
function vendorPropName( style, name ) { // shortcut for names that are not vendor prefixed
if ( name in style ) {
return name;
} // check for vendor prefixed names
var capName = name.charAt(0).toUpperCase() + name.slice(1),
origName = name,
i = cssPrefixes.length; while ( i-- ) {
name = cssPrefixes[ i ] + capName;
if ( name in style ) {
return name;
}
} return origName;
} function isHidden( elem, el ) {
// isHidden might be called from jQuery#filter function;
// in that case, element will be second argument
elem = el || elem;
return jQuery.css( elem, "display" ) === "none" || !jQuery.contains( elem.ownerDocument, elem );//动态创建的元素也是不包含也是隐藏
} // NOTE: we've included the "window" in window.getComputedStyle
// because jsdom on node.js will break without it.
function getStyles( elem ) {
return window.getComputedStyle( elem, null );//封装
} function showHide( elements, show ) {
var display, elem, hidden,
values = [],
index = 0,
length = elements.length; for ( ; index < length; index++ ) {
elem = elements[ index ];
if ( !elem.style ) {
continue;
} values[ index ] = data_priv.get( elem, "olddisplay" );
display = elem.style.display;
if ( show ) {
// Reset the inline display of this element to learn if it is
// being hidden by cascaded rules or not
if ( !values[ index ] && display === "none" ) {
elem.style.display = "";
} // Set elements which have been overridden with display: none
// in a stylesheet to whatever the default browser style is
// for such an element
if ( elem.style.display === "" && isHidden( elem ) ) {
values[ index ] = data_priv.access( elem, "olddisplay", css_defaultDisplay(elem.nodeName) );
}
} else { if ( !values[ index ] ) {
hidden = isHidden( elem ); if ( display && display !== "none" || !hidden ) {
//获取元素原来的显示样式，块级元素是block行内元素是inline
data_priv.set( elem, "olddisplay", hidden ? display : jQuery.css(elem, "display") );
}
}
}
} //每一个元素遍历
for ( index = 0; index < length; index++ ) {
elem = elements[ index ];
if ( !elem.style ) {//有sytle属性通过style属性隐藏显示，没有就跳出。
continue;
}
if ( !show || elem.style.display === "none" || elem.style.display === "" ) {
//values[ index ] || ""，values[ index ]不存在时给空就是false,不直接写 = show ? 'block' ：'none'，因为是行内元素就不能是block而是in-line,
//元素一上来是隐藏状态是获取不到元素的display属性是块级还是行内，调用show的时候通过elem.nodeName动态创建，获取元素是块级还是行内。
elem.style.display = show ? values[ index ] || "" : "none";
}
} return elements;
} jQuery.fn.extend({
//$('#div1').css('color','yellow');
css: function( name, value ) {
return jQuery.access( this, function( elem, name, value ) {
var styles, len,
map = {},
i = 0;
//$('#div1').css( ['color','backgroundColor','width'] )
if ( jQuery.isArray( name ) ) {//数组获取
styles = getStyles( elem );
len = name.length; for ( ; i < len; i++ ) {
//调用jQuery.css()方法来获取
//jQuery.css方法多个值获取传了4个参数，第三个参数是false相当于没传，只是占位隔开第四个参数，
map[ name[ i ] ] = jQuery.css( elem, name[ i ], false, styles );
} return map;
} return value !== undefined ?
jQuery.style( elem, name, value ) ://设置:$('#div1').css('color','yellow')
jQuery.css( elem, name );//获取:$('#div1').css('color')，单个值获取只传了2个参数，后面2个参数没传相当于是false,
}, name, value, arguments.length > 1 );
},
show: function() {
return showHide( this, true );
},
hide: function() {
return showHide( this );//没传就是false
},
toggle: function( state ) {
if ( typeof state === "boolean" ) {
return state ? this.show() : this.hide();
} return this.each(function() {
if ( isHidden( this ) ) {//jQuery对象里面每一个元素是js节点对象
jQuery( this ).show();
} else {
jQuery( this ).hide();
}
});
}
}); jQuery.extend({
// Add in style property hooks for overriding the default
// behavior of getting and setting a style property
cssHooks: {
opacity: {//透明度处理
get: function( elem, computed ) {
if ( computed ) {
// We should always get a number back from opacity
var ret = curCSS( elem, "opacity" );
return ret === "" ? "1" : ret;
}
}
}
}, // Don't automatically add "px" to these possibly-unitless properties
cssNumber: {
"columnCount": true,
"fillOpacity": true,
"fontWeight": true,
"lineHeight": true,
"opacity": true,
"order": true,
"orphans": true,
"widows": true,
"zIndex": true,
"zoom": true
}, // Add in properties whose names you wish to fix before
// setting or getting the value
cssProps: {
// normalize float css property
"float": "cssFloat"
}, //设置:jQuery.style( $('#div1')[i], 'float','left' )
style: function( elem, name, value, extra ) {
//元素节点的节点类型是3或者8，
if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
return;
}
// Make sure that we're working with the right name
var ret, type, hooks,
origName = jQuery.camelCase( name ),//转驼峰,background-color --> backgroundColor
style = elem.style;//元素的所有style
//有就返回，没有就加入cssProps这个json,全部保存在$这个对象中。将float转成cssfloat，
name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( style, origName ) );
// gets hook for the prefixed version
// followed by the unprefixed version
hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];
// Check if we're setting a value
if ( value !== undefined ) {//设置
type = typeof value;
// convert relative number strings (+= or -=) to relative numbers. #7345
//$('#div1').css('width','+=100');
if ( type === "string" && (ret = rrelNum.exec( value )) ) {
value = ( ret[1] + 1 ) * ret[2] + parseFloat( jQuery.css( elem, name ) );
// Fixes bug #9237
type = "number";
}
// value是空或者无限大，设置时候就返回，
if ( value == null || type === "number" && isNaN( value ) ) {
return;
}
// origName不在jQuery.cssNumber中，在jQuery.cssNumber中不需要加单位。
if ( type === "number" && !jQuery.cssNumber[ origName ] ) {
value += "px";//加单位
} // Fixes #8908, it can be done more correctly by specifying setters in cssHooks,
// but it would mean to define eight (for every problematic property) identical functions
if ( !jQuery.support.clearCloneStyle && value === "" && name.indexOf("background") === 0 ) {
style[ name ] = "inherit";
} // If a hook was provided, use that value, otherwise just set the specified value
if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value, extra )) !== undefined ) {
style[ name ] = value;//没有兼容性，通过style.name = value设置
} } else {//获取
// If a hook was provided get the non-computed value from there
if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
return ret;
} // 没有兼容性，通过style.name获取
return style[ name ];
}
}, //获取:jQuery.css( $('#div1')[i], 'color' );
css: function( elem, name, extra, styles ) {
var val, num, hooks,
//$('#div1').css('background-color'); odiv.style.background-color是不行的，转驼峰成backgroundColor
origName = jQuery.camelCase( name );//转驼峰， /*
cssProps: {
"float": "cssFloat" //class js中通过 className代表
},
*/
//有就返回，没有就加入cssProps这个json,全部保存在$这个对象中。
name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( elem.style, origName ) );
// gets hook for the prefixed version
// followed by the unprefixed version
hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ]; // 获取值的兼容性处理
if ( hooks && "get" in hooks ) {
val = hooks.get( elem, true, extra );
} // 不做兼容性处理调用curCSS方法获取
if ( val === undefined ) {
val = curCSS( elem, name, styles );
} /*
cssNormalTransform = {
letterSpacing: 0,
fontWeight: 400
},
返回的值是normal，并且属性名是letterSpacing、fontWeight就返回0、40
*/
if ( val === "normal" && name in cssNormalTransform ) {
val = cssNormalTransform[ name ];
} // 额外参数做判断
if ( extra === "" || extra ) {
num = parseFloat( val );//123px转换成123
return extra === true || jQuery.isNumeric( num ) ? num || 0 : val;
}
return val;
}
}); //curCSS( $('#div1')[i], 'color')
curCSS = function( elem, name, _computed ) {
var width, minWidth, maxWidth,
computed = _computed || getStyles( elem ),//getStyles调用原生window.getComputedStyle( elem, null );提高性能 // Support: IE9
// getPropertyValue is only needed for .css('filter') in IE9, see #12537
ret = computed ? computed.getPropertyValue( name ) || computed[ name ] : undefined,
style = elem.style; if ( computed ) {
//ownerDocument获取元素所在页面的document，动态创建一个元素var $span = $('<span>') 就不包含，调用jQuery.style方法来获取，
if ( ret === "" && !jQuery.contains( elem.ownerDocument, elem ) ) {
ret = jQuery.style( elem, name );
} // Support: Safari 5.1
// A tribute to the "awesome hack by Dean Edwards"
// Safari 5.1.7 (at least) returns percentage for a larger set of values, but width seems to be reliably pixels
// this is against the CSSOM draft spec: http://dev.w3.org/csswg/cssom/#resolved-values
if ( rnumnonpx.test( ret ) && rmargin.test( name ) ) { // Remember the original values
width = style.width;
minWidth = style.minWidth;
maxWidth = style.maxWidth; // Put in the new values to get a computed value out
style.minWidth = style.maxWidth = style.width = ret;
ret = computed.width; // Revert the changed values
style.width = width;
style.minWidth = minWidth;
style.maxWidth = maxWidth;
}
} return ret;
}; function setPositiveNumber( elem, value, subtract ) {
var matches = rnumsplit.exec( value );
return matches ?
// Guard against undefined "subtract", e.g., when used as in cssHooks
Math.max( 0, matches[ 1 ] - ( subtract || 0 ) ) + ( matches[ 2 ] || "px" ) :
value;
} function augmentWidthOrHeight( elem, name, extra, isBorderBox, styles ) {
var i = extra === ( isBorderBox ? "border" : "content" ) ?
// If we already have the right measurement, avoid augmentation
4 :
// Otherwise initialize for horizontal or vertical properties
name === "width" ? 1 : 0, val = 0; for ( ; i < 4; i += 2 ) {
// both box models exclude margin, so add it if we want it
if ( extra === "margin" ) {
val += jQuery.css( elem, extra + cssExpand[ i ], true, styles );
} if ( isBorderBox ) {
// border-box includes padding, so remove it if we want content
if ( extra === "content" ) {
val -= jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );
} // at this point, extra isn't border nor margin, so remove border
if ( extra !== "margin" ) {
val -= jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
}
} else {
// at this point, extra isn't content, so add padding
val += jQuery.css( elem, "padding" + cssExpand[ i ], true, styles ); // at this point, extra isn't content nor padding, so add border
if ( extra !== "padding" ) {
val += jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
}
}
} return val;
} function getWidthOrHeight( elem, name, extra ) { // Start with offset property, which is equivalent to the border-box value
var valueIsBorderBox = true,
val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
styles = getStyles( elem ),
isBorderBox = jQuery.support.boxSizing && jQuery.css( elem, "boxSizing", false, styles ) === "border-box"; // some non-html elements return undefined for offsetWidth, so check for null/undefined
// svg - https://bugzilla.mozilla.org/show_bug.cgi?id=649285
// MathML - https://bugzilla.mozilla.org/show_bug.cgi?id=491668
if ( val <= 0 || val == null ) {
// Fall back to computed then uncomputed css if necessary
val = curCSS( elem, name, styles );
if ( val < 0 || val == null ) {
val = elem.style[ name ];
} // Computed unit is not pixels. Stop here and return.
if ( rnumnonpx.test(val) ) {
return val;
} // we need the check for style in case a browser which returns unreliable values
// for getComputedStyle silently falls back to the reliable elem.style
valueIsBorderBox = isBorderBox && ( jQuery.support.boxSizingReliable || val === elem.style[ name ] ); // Normalize "", auto, and prepare for extra
val = parseFloat( val ) || 0;
} // use the active box-sizing model to add/subtract irrelevant styles
return ( val +
augmentWidthOrHeight(
elem,
name,
extra || ( isBorderBox ? "border" : "content" ),
valueIsBorderBox,
styles
)
) + "px";
} //元素一上来是隐藏状态是获取不到元素的display属性是块级还是行内，调用show的时候通过elem.nodeName动态创建，获取元素是块级还是行内。
//css_defaultDisplay(elem.nodeName) elem.nodeName=div或者span
function css_defaultDisplay( nodeName ) {
var doc = document,
/*
elemdisplay = { BODY: "block" },
*/
display = elemdisplay[ nodeName ]; if ( !display ) {//元素是body就是block,不是body就动态创建然后获取display属性，因为body不能动态创建
display = actualDisplay( nodeName, doc );//动态创建 // iframe情况
if ( display === "none" || !display ) {
//动态创建iframe
iframe = ( iframe ||
jQuery("<iframe frameborder='0' width='0' height='0'/>")
.css( "cssText", "display:block !important" )
).appendTo( doc.documentElement ); // Always write a new HTML skeleton so Webkit and Firefox don't choke on reuse
doc = ( iframe[0].contentWindow || iframe[0].contentDocument ).document;
doc.write("<!doctype html><html><body>");
doc.close();
//获取iframe里面的节点的display属性
display = actualDisplay( nodeName, doc );
iframe.detach();
} // Store the correct default display
elemdisplay[ nodeName ] = display;
} return display;
} // 动态创建元素actualDisplay( span, document )
function actualDisplay( name, doc ) {
var elem = jQuery( doc.createElement( name ) ).appendTo( doc.body ),//创建添加到body中，动态创建元素肯定是显示的，
display = jQuery.css( elem[0], "display" );//获取display值
elem.remove();
return display;
} jQuery.each([ "height", "width" ], function( i, name ) {
jQuery.cssHooks[ name ] = {
get: function( elem, computed, extra ) {
if ( computed ) {
// certain elements can have dimension info if we invisibly show them
// however, it must have a current display style that would benefit from this
return elem.offsetWidth === 0 && rdisplayswap.test( jQuery.css( elem, "display" ) ) ?
jQuery.swap( elem, cssShow, function() {
return getWidthOrHeight( elem, name, extra );
}) :
getWidthOrHeight( elem, name, extra );
}
}, set: function( elem, value, extra ) {
var styles = extra && getStyles( elem );
return setPositiveNumber( elem, value, extra ?
augmentWidthOrHeight(
elem,
name,
extra,
jQuery.support.boxSizing && jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
styles
) : 0
);
}
};
}); // These hooks cannot be added until DOM ready because the support test
// for it is not run until after DOM ready
jQuery(function() {
// Support: Android 2.3
if ( !jQuery.support.reliableMarginRight ) {
jQuery.cssHooks.marginRight = {
get: function( elem, computed ) {
if ( computed ) {
// Support: Android 2.3
// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
// Work around by temporarily setting element display to inline-block
return jQuery.swap( elem, { "display": "inline-block" },
curCSS, [ elem, "marginRight" ] );
}
}
};
} // Webkit bug: https://bugs.webkit.org/show_bug.cgi?id=29084
// getComputedStyle returns percent when specified for top/left/bottom/right
// rather than make the css module depend on the offset module, we just check for it here
if ( !jQuery.support.pixelPosition && jQuery.fn.position ) {
jQuery.each( [ "top", "left" ], function( i, prop ) {
jQuery.cssHooks[ prop ] = {
get: function( elem, computed ) {
if ( computed ) {
computed = curCSS( elem, prop );
// if curCSS returns percentage, fallback to offset
return rnumnonpx.test( computed ) ?
jQuery( elem ).position()[ prop ] + "px" :
computed;
}
}
};
});
} }); if ( jQuery.expr && jQuery.expr.filters ) {
jQuery.expr.filters.hidden = function( elem ) {
// Support: Opera <= 12.12
// Opera reports offsetWidths and offsetHeights less than zero on some elements
return elem.offsetWidth <= 0 && elem.offsetHeight <= 0;
}; jQuery.expr.filters.visible = function( elem ) {
return !jQuery.expr.filters.hidden( elem );
};
} // These hooks are used by animate to expand properties
jQuery.each({
margin: "",
padding: "",
border: "Width"
}, function( prefix, suffix ) {
jQuery.cssHooks[ prefix + suffix ] = {
expand: function( value ) {
var i = 0,
expanded = {}, // assumes a single number if not a string
parts = typeof value === "string" ? value.split(" ") : [ value ]; for ( ; i < 4; i++ ) {
expanded[ prefix + cssExpand[ i ] + suffix ] =
parts[ i ] || parts[ i - 2 ] || parts[ 0 ];
} return expanded;
}
}; if ( !rmargin.test( prefix ) ) {
jQuery.cssHooks[ prefix + suffix ].set = setPositiveNumber;
}
});
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