iframe是一個非常有用的標(biāo)簽,先不說早期用它來模型Ajax效果,現(xiàn)在富本文編輯器它也絕對是主角。但是它又是一個特別的元素,最早出現(xiàn)IE4.0中,后紛紛被其他游覽器吸納,由于IE不開源,iframe在各游覽器中都有很大差異。首先我們看看它在各游覽器中擁有什么屬性——
scrollWidth, clientLeft, clientHeight, clientWidth, clientTop, getClientRects, getBoundingClientRect, getElementsByClassName, baseURI, textContent, compareDocumentPosition, getUserData, isSameNode, lookupNamespaceURI, setUserData, lookupPrefix, isDefaultNamespace, isEqualNode, dispatchEvent, removeEventListener, style,contentEditable, offsetParent, innerHTML, offsetLeft, offsetTop, offsetHeight, offsetWidth, contentWindow, src, contentDocument, className, id, title, tagName, removeAttributeNS, removeAttribute, getAttribute, getElementsByTagName, setAttribute, getElementsByTagNameNS, hasAttributeNS, setAttributeNS, hasAttribute, getAttributeNS, nextSibling, firstChild, prefix, nodeValue, childNodes, nodeName, namespaceURI, previousSibling, nodeType, localName, lastChild, ownerDocument, parentNode, attributes, appendChild, cloneNode, normalize, hasChildNodes, insertBefore, replaceChild, removeChild, hasAttributes, isSupported, getAttributeNode, setAttributeNode, removeAttributeNode, getAttributeNodeNS, setAttributeNodeNS, ELEMENT_NODE, ATTRIBUTE_NODE, TEXT_NODE, CDATA_SECTION_NODE, ENTITY_REFERENCE_NODE, ENTITY_NODE, PROCESSING_INSTRUCTION_NODE, COMMENT_NODE, DOCUMENT_NODE, DOCUMENT_TYPE_NODE, DOCUMENT_FRAGMENT_NODE, NOTATION_NODE, lang, dir, align, frameBorder, height, longDesc, marginHeight, marginWidth, name, scrolling,width , getSVGDocument, tabIndex, draggable, blur, focus, scrollIntoView, spellcheck, addEventListener, getFeature, DOCUMENT_POSITION_DISCONNECTED, DOCUMENT_POSITION_PRECEDING, DOCUMENT_POSITION_FOLLOWING, DOCUMENT_POSITION_CONTAINS, DOCUMENT_POSITION_CONTAINED_BY, DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC, scrollTop, scrollLeft, scrollHeight, firstElementChild, lastElementChild, previousElementSibling, nextElementSibling, childElementCount, children, querySelector, querySelectorAll
language, scrollHeight, isTextEdit, currentStyle,document , onmouseup, oncontextmenu, isMultiLine, clientHeight, onrowexit, onbeforepaste, onactivate, scrollLeft, lang, onmousemove, onmove, onselectstart, parentTextEdit, oncontrolselect, canHaveHTML, onkeypress, oncut, onrowenter, onmousedown, onpaste, className, id, onreadystatechange,onbeforedeactivate , hideFocus, dir, isContentEditable, onkeydown, clientWidth, onlosecapture, parentElement, ondrag, ondragstart, oncellchange, recordNumber, onfilterchange, onrowsinserted, ondatasetcomplete, onmousewheel, ondragenter, onblur, onresizeend, onerrorupdate, onbeforecopy, ondblclick, scopeName, onkeyup, onresizestart, onmouseover, onmouseleave, outerText, innerText, onmoveend, tagName, title, offsetWidth, onresize, contentEditable, runtimeStyle, filters, ondrop, onpage, onrowsdelete, tagUrn, offsetLeft, clientTop, style, onfocusout, clientLeft, ondatasetchanged, canHaveChildren, ondeactivate, isDisabled, onpropertychange, ondragover, onhelp, ondragend, onbeforeeditfocus, disabled, onfocus, behaviorUrns, accessKey, onscroll, onbeforeactivate, onbeforecut, readyState, all, sourceIndex, onclick, scrollTop, oncopy, onfocusin, tabIndex, onbeforeupdate, outerHTML, innerHTML, ondataavailable, offsetHeight, onmovestart, onmouseout, scrollWidth, offsetTop, onmouseenter, onlayoutcomplete, offsetParent, onafterupdate, ondragleave, children, parentNode, border, nodeValue, firstChild, name, align, marginWidth,contentWindow , hspace, frameSpacing, dataFormatAs, lastChild, ownerDocument, vspace, marginHeight, dataFld, attributes, dataSrc, src, frameBorder, nodeType, noResize, width, previousSibling, scrolling, nodeName, childNodes, longDesc, onload, nextSibling, height, allowTransparency
nextSibling, onresizeend, onrowenter, aria-haspopup, childNodes, ondragleave, canHaveHTML, onbeforepaste, ondragover, onbeforecopy, aria-disabled, onpage, recordNumber, previousSibling, nodeName, onbeforeactivate, accessKey, currentStyle, scrollLeft, onbeforeeditfocus, oncontrolselect, aria-hidden, onblur, hideFocus, clientHeight,style, onbeforedeactivate, dir, aria-expanded, onkeydown, nodeType, ondragstart, onscroll, onpropertychange, ondragenter, id, aria-level, onrowsinserted, scopeName, lang, onmouseup, aria-busy, oncontextmenu, language, scrollTop, offsetWidth, onbeforeupdate, onreadystatechange, onmouseenter, filters, onresize, isContentEditable, aria-checked, aria-readonly, oncopy, onselectstart, scrollHeight, onmove, ondragend, onrowexit, lastChild, aria-secret, onactivate, canHaveChildren, onfocus, onfocusin, isMultiLine, onmouseover, offsetTop, oncut, parentNode, tagName, className, onmousemove, title, role, behaviorUrns, onfocusout, onfilterchange, disabled, parentTextEdit, ownerDocument, offsetParent, aria-posinset, ondrop, ondblclick, onrowsdelete, tabIndex, onkeypress, aria-relevant, onlosecapture, innerText, aria-live, parentElement, ondeactivate, aria-labelledby, aria-pressed, children, ondatasetchanged, ondataavailable, aria-invalid, onafterupdate, nodeValue, onmousewheel, onkeyup, readyState, onmovestart, aria-valuenow, aria-selected, onmouseout, aria-owns, aria-valuemax, onmoveend, contentEditable, document, firstChild, sourceIndex, outerText, isTextEdit, isDisabled, oncellchange, runtimeStyle, scrollWidth, aria-valuemin, onlayoutcomplete, onhelp, attributes, offsetHeight, onerrorupdate, onmousedown, clientTop, aria-setsize, clientWidth, onpaste, tagUrn, onmouseleave, onclick, outerHTML, ondrag, aria-controls, onresizestart, aria-flowto, ondatasetcomplete, aria-required, clientLeft, aria-describedby, all, onbeforecut, innerHTML, aria-activedescendant, aria-multiselectable, offsetLeft, frameSpacing, vspace, noResize, onload,height , marginHeight,border , longDesc, src, frameBorder, dataFormatAs,width , dataSrc, allowTransparency, contentDocument, name,contentWindow, marginWidth, dataFld, scrolling, align, hspace
通常要隱藏iframe的邊框時需要用到frameborder屬性,例如使用Dreamweaver可以生成如下代碼:
但是如果使用DOM方式來生成一個iframe時IE卻始終隱藏不了邊框,例如:
我們需要直接對其屬性進(jìn)行賦值:
Internet Explorer 5.5 支持浮動框架的內(nèi)容透明。如果想要為浮動框架定義透明內(nèi)容,則必須滿足下列條件:
對iframe進(jìn)行操作:
如果只想改變iframe的 src 或者 border ,scrolling 等attributes(與property不是一個概念,property是不能寫在標(biāo)簽內(nèi)的,比如:scrollHeight,nnerHTML等),就需要用到第一種方法。
如果想取得iframe的頁面(不是iframe本身)。就需要使用第二種方法,因?yàn)樗〉玫氖且粋€完整的DOM模型,比如想得到iframe的document.body的內(nèi)容,就只能用第二種方法
操作iframe中的DOM元素,需要注意以下兩點(diǎn):
控制Iframe中的頁面的樣式
去掉動態(tài)創(chuàng)建的iframe的邊框
window跟iframe標(biāo)簽是兩回事 iframe的contentWindow屬性是它里面的window
用getElementById才能取到iframe標(biāo)簽 ie直接用id得到的是里面的window
scrollHeight返回的是一個數(shù)字,沒有帶單位
在IE 下如果沒有DTD聲明,則按loose.dtd 解析,在設(shè)置對像的寬高時,會自動的加上單位"px"
將iframe的高度設(shè)為document.body的高度,也并不一定能成功,因?yàn)閐ocument.body的高度可能沒有整個檔的高度大,如使用了層
正確寫法如下
注:偽Ajax效果就是這樣模擬的了
document.getElementById取到的iframe是不能直接操作里面的document的,只能這樣?。?/p>
最后切記iframe在FF中是不綁定任何事件的!
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