bottom Attribute | bottom参数属性 | DHTML文档教程 |
Sets or retrieves the bottom position of the object in relation to the bottom of the next positioned object in the document hierarchy.
dhtml语法
HTML { bottom : sBottom } Scripting object.style.bottom [ = sBottom ]
DHTML可能的值
sBottom Variant that specifies or receives one of the following values.
auto Default. Default position, according to the regular HTML layout of the page. length Floating-point number, followed by an absolute units designator (cm, mm, in, pt, pc, or px) or a relative units designator (em or ex). For more information about the supported length units, see css length units reference. percentage Integer, followed by a percent sign (%). The value is a percentage of the height of the parent object. The property is read/write for all objects except the following, for which it is read-only: currentStyle. The property has a default value of auto. The Cascading Style Sheets (CSS) attribute is not inherited.
Expressions can be used in place of the preceding value(s), as of Microsoft® Internet Explorer 5. For more information, see about dynamic properties.
remarks
the bottom attribute should be used only when the position attribute is set; otherwise, the value of the bottom attribute is ignored.
Because the value of the bottom property is a string, the property cannot be used in script to calculate the position of the object in the document; instead, the pixelbottom property or the posbottom property should be used.
for more information about how to access the dimension and location of objects on the page through the dynamic html（动态html，即dhtml） object model, see measuring element dimension and location.
DHTML代码范例
This example uses the bottom attribute to set a div object 50 pixels from the bottom of the client area.
<div style = "position:absolute; bottom:50px"> . . . </DIV>
是否符合公共标准
This property is defined in Cascading Style Sheets (CSS), Level 2 (CSS2)
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Applies To
A, ADDRESS, APPLET, B, BIG, BLOCKQUOTE, BUTTON, CENTER, CITE, CODE, currentStyle, CUSTOM, DD, defaults, DFN, DIR, DIV, DL, FIELDSET, FONT, FORM, hn, HR, I, IFRAME, IMG, INPUT type=button, INPUT type=checkbox, INPUT type=file, INPUT type=image, INPUT type=password, INPUT type=radio, INPUT type=reset, INPUT type=submit, INPUT type=text, ISINDEX, KBD, LABEL, LEGEND, LI, LISTING, MARQUEE, MENU, OBJECT, OL, P, PRE, runtimeStyle, S, SAMP, SELECT, SMALL, SPAN, STRIKE, STRONG, style, SUB, SUP, TABLE, TEXTAREA, TT, U, UL, VAR, XMP
更多语法参考
pixeltop, posTop