IHTMLElement和IHTMLElement2接口

IHTMLElement和IHTMLElement2是IE浏览器(WebBrowser控件,trident内核)的两个同系列针对文档元素的接口。这两个接口都提供了以编程方式访问常见的所有元素对象的属性和方法的途径。 一、 下面还是先介绍IHTMLElement接口 。 IHTMLElement接口里有不少的变量和

        IHTMLElement和IHTMLElement2是IE浏览器(WebBrowser控件,trident内核)的两个同系列针对文档元素的接口。这两个接口都提供了以编程方式访问常见的所有元素对象的属性和方法的途径。

       一、下面还是先介绍IHTMLElement接口。

      IHTMLElement接口里有不少的变量和函数，其变量大多是文档元素的属性，比如class、id、attribute、lang、tagName、InnerText、InnerHtml、OuterText、OuterHtml、child、parentElement等，还有部分是style属性，比如offsetHeight、offsetLeft、style等，另外有一部分关于该元素的动作属性，比如onclick、ondragstart、onmousedown、onmousemove等。在这些成员属性之外，还有成员方法，比如click()、getAttribute(..)，另外一部分成员方法就是针对各个成员变量安排的成员函数（getXX、setXX)，比如id这个属性，HRESULT get_id(BSTR *p)、HRESULT put_id(BSTR *p)，对于onmousedown这个成员属性，其对应的成员函数是HRESULT get_onmousedown(VARIANT *p)、HRESULT put_onmousedown(VARIANT *p)，其中VARIANT是VT_IDISPATCH类型，其细化了IDispatch接口。

all                  Retrieves the collection of all the objects in the HTML that are within the scope of this object.

children         Retrieves the collection that contains all the immediate children of this object.

className    Sets or retrieves the class of the object.

click              Simulates a click by causing the onclick event to fire.

contains       Checks whether the given element is contained within the object.

document     Gets the document object for the document that the browser is displaying.

filters            Retrieves a collection of filters for an element.

getAttribute    Retrieves the value of the specified attribute.

id                  Sets or retrieves the string identifying the object.

innerHTML    Gets or sets the HTML between the start and end tags of the object.

innerText      Sets or retrieves the text between the start and end tags of the object.

insertAdjacentHTML         Inserts the given HTML text into the element at the location.

insertAdjacentText              Inserts the given text into the element at the specified location.

isTextEdit       Retrieves whether a TextRange object can be created using the object.

lang                Sets or retrieves the language to use.

language       Sets or retrieves the language in which the current script is written.

offsetHeight                     Retrieves the height of the object relative to the layout or coordinate parent, as specified by the IHTMLElement::offsetParent property.

offsetLeft                         Retrieves the calculated left position of the object relative to the layout or coordinate parent, as specified by the IHTMLElement::offsetParent property.

offsetParent                                                   Retrieves a reference to the container object that defines the IHTMLElement::offsetTop and IHTMLElement::offsetLeft properties of the object.

offsetTop                         Retrieves the calculated top position of the object relative to the layout or coordinate parent, as specified by the IHTMLElement::offsetParent property.

offsetWidth                     Retrieves the width of the object relative to the layout or coordinate parent, as specified by the IHTMLElement::offsetParent property.

onafter              updateSets or retrieves a pointer to the event handler function associated with the onafterupdate event.

onbeforeupdate            Sets or retrieves a pointer to the event handler function associated with the onbeforeupdate event.

onclick              Sets or retrieves a pointer to the event handler function associated with the onclick event.

ondataavailable             Sets or retrieves a pointer to the event handler function associated with the ondataavailable event.

ondatasetchanged        Sets or retrieves a pointer to the event handler function associated with the ondatasetchanged event.

ondatasetcomplete       Sets or retrieves a pointer to the event handler function associated with the ondatasetcomplete event.

ondblclick                      Sets or retrieves a pointer to the event handler function associated with the ondblclick event.

ondragstart                   Sets or retrieves a pointer to the event handler function associated with the ondragstart event.

onerrorupdate              Sets or retrieves a pointer to the event handler function associated with the onerrorupdate event.

onfilterchange              Sets or retrieves a pointer to the event handler function associated with the event.

onhelp                           Sets or retrieves a pointer to the event handler function associated with the onhelp event.

onkeydown                   Sets or retrieves a pointer to the event handler function associated with the onkeydown event.

onkeypress                  Sets or retrieves a pointer to the event handler function associated with the onkeypress event.

onkeyup                       Sets or retrieves a pointer to the event handler function associated with the onkeyup event.

onmousedown             Sets or retrieves a pointer to the event handler function associated with the onmousedown event.

onmousemove            Sets or retrieves a pointer to the event handler function associated with the onmousemove event.

onmouseout                Sets or retrieves a pointer to the event handler function associated with the onmouseout event.

onmouseover              Sets or retrieves a pointer to the event handler function associated with the onmouseover event.

onmouseup                 Sets or retrieves a pointer to the event handler function associated with the onmouseup event.

onrowenter                 Sets or retrieves a pointer to the event handler function associated with the onrowenter event.

onrowexit                    Sets or retrieves a pointer to the event handler function associated with the onrowexit event.

onselectstart              Sets or retrieves a pointer to the event handler function associated with the onselectstart event.

outerHTML                 Sets or retrieves the object and its content in HTML.

outerText                   Sets or retrieves the text of the object.

parentElement         Retrieves the parent object in the object hierarchy.

parentTextEdit         Retrieves the container object in the document hierarchy that can be used to create a TextRange containing the original object.

recordNumber         Retrieves the ordinal record from the data set that generated the object.

removeAttribute      Removes an attribute from an object.

scrollIntoView          Causes the object to scroll into view, aligning it either at the top or bottom of the window.

setAttribute              Sets the value of the specified attribute.

sourceIndex            Retrieves the ordinal position of the object, in source order, as the object appears in the document's all collection.

style                         Retrieves an inline style sheet for the tag.

tagName                 Retrieves the tag name of the object.

title                         Sets or retrieves advisory information (a ToolTip) for the object.

toString                   Retrieves a string representation of the object.

二、IHTMLElement2接口的介绍

      IHTMLElement2是在IHTMLElement接口基础上加了一些成员属性和方法，以满足浏览器升级的需求。其加的属性，如readyState、readyStateValue、currentStyle、与scroll(滑动条)有关的几个属性、capture、expression、behavior等属性及其设置与删除。

onpropertychange          Sets or retrieves a pointer to the event handler function associated with the onpropertychange event.

onreadystatechange      Sets or retrieves a pointer to the event handler function associated with the onreadystatechange event.

onresize                         Sets or retrieves a pointer to the event handler function associated with the onresize event.

onrowsdelete                 Sets or retrieves a pointer to the event handler function associated with the onrowsdelete event.

onrowsinserted             Sets or retrieves a pointer to the event handler function associated with the onrowsinserted event.

onscroll                         Sets or retrieves a pointer to the event handler function associated with the onscroll event.

readyState                    Retrieves the current state of the object.

readyStateValue           Gets the current state of the object.

releaseCapture             Removes mouse capture from the object in the current document.

removeBehavior            Detaches a behavior from the element.

removeExpression        Removes the expression from the specified property.

removeFilter                 Not implemented.

replaceAdjacentText    Replaces the text adjacent to the element.

runtimeStyle                Gets the element's runtimeStyle object.

scopeName                 Gets the namespace defined for the element.

scrollHeight                 Retrieves the scrolling height of the object.

scrollLeft                     Sets or retrieves the distance between the left edge of the object and the leftmost portion of the content currently visible in the window.

scrollTop                     Sets or retrieves the distance between the top of the object and the topmost portion of the content currently visible in the window.

scrollWidth                 Retrieves the scrolling width of the object.

setCapture                Sets the mouse capture to the object that belongs to the current document.

setExpression           Sets an expression for the specified object.

tabIndex                   Sets or retrieves the index that defines the tab order for the object.

tagUrn                       Sets or gets the URN specified in the namespace declaration.

canHaveChildren      Gets a value indicating whether the object can contain child objects.

        下面说下IHTMLElement2接口的版本等问题。注意，IHTMLElement接口只需要IE4及其以上版本即可。

      Interface Information

Stock Implementation                            mshtml.dll

Custom Implementation                          No

Inherits from                                            IDispatch

Header and IDL files                                Mshtml.h, Mshtml.idl

Minimum availability                                  Internet Explorer5

Minimum operating systems                      Windows 95, Windows NT 4.0, Windows CE 4.0