【问题标题】:GetElementByClass?按类获取元素?
【发布时间】:2012-11-18 19:25:25
【问题描述】:
如何从具有类名的元素中获取 InnerText?
<div class="SomeClass" style="text-align: left; display: block;"></div>
<div class="SomeClass" style="text-align: left; display: block;">Sometext</div>
【问题讨论】:
标签:
delphi
delphi-xe2
twebbrowser
【解决方案1】:
好吧,这门课可能不止一个,你必须使用我为你制作的 TstringList 函数:
function GetInnersByClass(const Doc: IDispatch; const classname: string;var Lst:TStringList): Integer;
var
Document: IHTMLDocument2; // IHTMLDocument2 interface of Doc
Body: IHTMLElement2; // document body element
Tags: IHTMLElementCollection; // all tags in document body
Tag: IHTMLElement; // a tag in document body
I: Integer; // loops thru tags in document body
begin
Lst.Clear;
Result := 0 ;
// Check for valid document: require IHTMLDocument2 interface to it
if not Supports(Doc, IHTMLDocument2, Document) then
raise Exception.Create('Invalid HTML document');
// Check for valid body element: require IHTMLElement2 interface to it
if not Supports(Document.body, IHTMLElement2, Body) then
raise Exception.Create('Can''t find <body> element');
// Get all tags in body element ('*' => any tag name)
Tags := Body.getElementsByTagName('*');
// Scan through all tags in body
for I := 0 to Pred(Tags.length) do
begin
// Get reference to a tag
Tag := Tags.item(I, EmptyParam) as IHTMLElement;
// Check tag's id and return it if id matches
if AnsiSameText(Tag.className, classname) then
begin
Lst.Add(Tag.innerHTML);
Inc(Result);
end;
end;
end;
结果是每个类有多少个功能
你可以在这个示例中使用它:
var
lst : TStringList;
begin
//
lst := TStringList.Create;
GetInnersByClass(wb1.Document,'SameClass',lst);
ShowMessage(lst.Text);
lst.Free;
end;
不要忘记将 MSHTML 单元添加到主单元。
【解决方案2】:
hi for find value in HTML doc yo must have special property same id .
这是重要的特殊属性。
例如,您可以使用此函数查找内部文本,但使用 id :
function GetInnerElementById(const Doc: IDispatch; const Id: string): WideString;
var
Document: IHTMLDocument2; // IHTMLDocument2 interface of Doc
Body: IHTMLElement2; // document body element
Tags: IHTMLElementCollection; // all tags in document body
Tag: IHTMLElement; // a tag in document body
I: Integer; // loops thru tags in document body
begin
Result :='';
// Check for valid document: require IHTMLDocument2 interface to it
if not Supports(Doc, IHTMLDocument2, Document) then
raise Exception.Create('Invalid HTML document');
// Check for valid body element: require IHTMLElement2 interface to it
if not Supports(Document.body, IHTMLElement2, Body) then
raise Exception.Create('Can''t find <body> element');
// Get all tags in body element ('*' => any tag name)
Tags := Body.getElementsByTagName('*');
// Scan through all tags in body
for I := 0 to Pred(Tags.length) do
begin
// Get reference to a tag
Tag := Tags.item(I, EmptyParam) as IHTMLElement;
// Check tag's id and return it if id matches
if AnsiSameText(Tag.id, Id) then
begin
Result := Tag.innerHTML;
Break;
end;
end;
end;
您必须使用“MSHTML”单元...
您可以将其与示例一起使用:
</head>
<body>
<div id="TESTID">sametext</div>
</body>
ShowMessage(GetElementById(wb1.Document,'TESTID'));
如果你必须使用 SomeClass 告诉我我给你新功能....