我有一个包含HTML代码的字符串var'HTMLCode'。我想将此代码加载到浏览器中。
这是Embarcadero的代码:
procedure THTMLEdit.EditText(CONST HTMLCode: string);
{VAR
Doc: IHTMLDocument2;
TempFile: string; }
begin
TempFile := GetTempFile('.html');
StringToFile(TempFile, HTMLCode);
wbBrowser.Navigate(TempFile);
Doc := GetDocument;
if Doc <> NIL
then Doc.Body.SetAttribute('contentEditable', 'true', 0); //crash here when I load complex html files
DeleteFile(TempFile);
end;
它有一些problems所以我用这个替换了它:
procedure THTMLEdit.EditText(CONST HTMLCode: string);
VAR
TSL: TStringList;
MemStream: TMemoryStream;
begin
wbBrowser.Navigate('about:blank');
WHILE wbBrowser.ReadyState < READYSTATE_INTERACTIVE
DO Application.ProcessMessages;
GetDocument.DesignMode := 'On';
if Assigned(wbBrowser.Document) then
begin
TSL := TStringList.Create;
TRY
MemStream := TMemoryStream.Create;
TRY
TSL.Text := HTMLCode;
TSL.SaveToStream(MemStream);
MemStream.Seek(0, 0);
(wbBrowser.Document as IPersistStreamInit).Load(TStreamAdapter.Create(MemStream));
FINALLY
MemStream.Free;
end;
FINALLY
TSL.Free;
end;
end;
end;
但是这个也存在问题。首先,当我在HTML代码中插入链接(...)时,浏览器会在我的网址前面更改代码appending'about:'。第二:它比第一个程序(带有临时文件的程序)慢。
我是否可以在浏览器中加载HTML代码而无需先导航到'about:blank'?
答案 0 :(得分:8)
您可以加载HTML
代码,如下所示
procedure THTMLEdit.EditText(CONST HTMLCode: string);
var
Doc: Variant;
begin
if NOT Assigned(wbBrowser.Document) then
wbBrowser.Navigate('about:blank');
Doc := wbBrowser.Document;
Doc.Clear;
Doc.Write(HTMLCode);
Doc.Close;
end;
答案 1 :(得分:6)
您的问题:
首先,当我在HTML代码中插入链接(...)时,浏览器会更改代码,附加&#39; about:&#39;在我的网址前面。
第二:它比第一个程序(带有临时文件的程序)慢。
我是否可以在浏览器中加载HTML代码而不使用首先导航到&#39;关于:空白&#39;?
<强>数目:强>
我们从代码和第一个程序(仅显示about:...)的来源开始。
{$R *.DFM}
var
Doc: IHTMLDocument2;
TempFile: string;
xBody : IHTMLElement;
xLoaded : Boolean;
onlyOnce: Boolean;
procedure TForm1.WB_LoadHTML(HTMLCode: string);
var
sl: TStringList;
ms: TMemoryStream;
begin
xLoaded := False;
WebBrowser.Navigate('about:blank');
while WebBrowser.ReadyState < READYSTATE_INTERACTIVE do
Application.ProcessMessages;
if Assigned(WebBrowser.Document) then
begin
sl := TStringList.Create;
try
ms := TMemoryStream.Create;
try
sl.Text := HTMLCode;
sl.SaveToStream(ms);
ms.Seek(0, 0);
(WebBrowser.Document as IPersistStreamInit).Load(TStreamAdapter.Create(ms));
finally
ms.Free;
end;
finally
sl.Free;
Doc := WebBrowser.Document as IHTMLDocument2;
end;
end;
end;
procedure TForm1.LoadHTMLBtnClick(Sender: TObject);
begin
WB_LoadHTML(Memo1.Text);
end;
procedure TForm1.LoadFileBtnClick(Sender: TObject);
begin
Memo1.Lines.LoadFromFile('G:\Programme\Apache Group\Apache\htdocs\bearbeiten1.html');
end;
我们创建了2个文件(相同),只有脚本不同才能在加载时获得警报 bearbeiten1.html
<script type="text/javascript">
alert ("bearbeiten1.html");
</script>
bearbeiten3.html
<script type="text/javascript">
alert ("bearbeiten3.html");
</script>
点击加载文件,我们加载&#34; bearbeiten1.html&#34;文件
并使用 WB_LoadHTML 将它们加载到内存中。
我们获得网址:about:blank
和警报
现在我们创建一个链接:
我们选择蓝色部分并单击 createlink
创建链接
以及新的&#34; Doc.body.innerHTML&#34;
procedure TForm1.createlinkBtnClick(Sender: TObject);
begin
Doc.execCommand('createlink', false,'bearbeiten3.html');
Memo1.Text := Doc.body.innerHTML;
end;
到目前为止一切顺利!但它会起作用吗? 否强>
点击链接后,我们得到的是一个包含网址的空白网站:
现在我们尝试新的 EditText()代码
procedure TForm1.EditText(CONST HTMLPath: string);
begin
TempFile := HTMLPath;
xLoaded := False;
WebBrowser.Navigate(TempFile);
Doc := WebBrowser.Document as IHTMLDocument2;
if Doc <> nil then xLoaded := True;
end;
procedure TForm1.EditTextBtnClick(Sender: TObject);
begin
EditText('G:\Programme\Apache Group\Apache\htdocs\bearbeiten1.html');
end;
点击加载文件,我们加载&#34; bearbeiten1.html&#34;再次归档 并使用EditTextBtnClick直接加载它。 看起来好多了!它会起作用吗??
让我们点击链接!我们得到警报!来自Nr。 ... 3.html&#34;
并且.html文件加载没有问题。
解决您的其他问题
if Doc <> NIL
then Doc.Body.SetAttribute('contentEditable', 'true', 0);
//crash here when I load complex html files
你是在错误的地方做到的,正文仅在网站加载后才可用!!
所以我把它放在事件 WebBrowserNavigateComplete2
只能提高快速解决方案
procedure TForm1.WebBrowserNavigateComplete2(Sender: TObject;
const pDisp: IDispatch; var URL: OleVariant);
begin
if xLoaded = True then begin
xBody := Doc.Get_body;
if xBody <> nil then begin
xBody.SetAttribute('contentEditable', 'true', 0);
Memo1.Text := Doc.body.innerHTML;
xLoaded := False;
end;
end;
label2.Caption := URL;
end;
完整的代码。
type
TForm1 = class(TForm)
WebBrowser: TWebBrowser;
Label1: TLabel;
Label2: TLabel;
Memo1: TMemo;
LoadHTMLBtn: TButton;
LoadFileBtn: TButton;
EditTextBtn: TButton;
createlinkBtn: TButton;
innerHTMLBtn: TButton;
procedure LoadHTMLBtnClick(Sender: TObject);
procedure LoadFileBtnClick(Sender: TObject);
procedure EditTextBtnClick(Sender: TObject);
procedure createlinkBtnClick(Sender: TObject);
procedure WebBrowserNavigateComplete2(Sender: TObject;
const pDisp: IDispatch; var URL: OleVariant);
procedure innerHTMLBtnClick(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
procedure WB_LoadHTML(HTMLCode: string);
procedure EditText(CONST HTMLPath: string);
public
{ Public-Deklarationen }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
var
Doc: IHTMLDocument2;
TempFile: string;
xBody : IHTMLElement;
xLoaded : Boolean;
onlyOnce: Boolean;
procedure TForm1.WB_LoadHTML(HTMLCode: string);
var
sl: TStringList;
ms: TMemoryStream;
begin
xLoaded := False;
WebBrowser.Navigate('about:blank');
while WebBrowser.ReadyState < READYSTATE_INTERACTIVE do
Application.ProcessMessages;
if Assigned(WebBrowser.Document) then
begin
sl := TStringList.Create;
try
ms := TMemoryStream.Create;
try
sl.Text := HTMLCode;
sl.SaveToStream(ms);
ms.Seek(0, 0);
(WebBrowser.Document as IPersistStreamInit).Load(TStreamAdapter.Create(ms));
finally
ms.Free;
end;
finally
sl.Free;
Doc := WebBrowser.Document as IHTMLDocument2;
end;
end;
end;
procedure TForm1.LoadHTMLBtnClick(Sender: TObject);
begin
WB_LoadHTML(Memo1.Text);
end;
procedure TForm1.LoadFileBtnClick(Sender: TObject);
begin
Memo1.Lines.LoadFromFile('G:\Programme\Apache Group\Apache\htdocs\bearbeiten1.html');
end;
procedure TForm1.EditText(CONST HTMLPath: string);
begin
TempFile := HTMLPath;
xLoaded := False;
WebBrowser.Navigate(TempFile);
if onlyOnce then WebBrowser.Navigate(TempFile);
onlyOnce := False;
Doc := WebBrowser.Document as IHTMLDocument2;
if Doc <> nil then xLoaded := True;
end;
procedure TForm1.EditTextBtnClick(Sender: TObject);
begin
EditText('G:\Programme\Apache Group\Apache\htdocs\bearbeiten1.html');
end;
procedure TForm1.createlinkBtnClick(Sender: TObject);
begin
Doc.execCommand('createlink', false,'bearbeiten3.html');
Memo1.Text := Doc.body.innerHTML;
end;
procedure TForm1.WebBrowserNavigateComplete2(Sender: TObject;
const pDisp: IDispatch; var URL: OleVariant);
begin
if xLoaded then begin
xBody := Doc.Get_body;
if xBody <> nil then begin
xBody.SetAttribute('contentEditable', 'true', 0);
Memo1.Text := Doc.body.innerHTML;
xLoaded := False;
end;
end;
label2.Caption := URL;
end;
procedure TForm1.innerHTMLBtnClick(Sender: TObject);
begin
Memo1.Text := Doc.body.innerHTML;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
onlyOnce := True;
end;
end.
<强>更新强>
我忘了在代码中设置Tempfile路径(复制粘贴错误)
FormCreate也添加了。
并且只有一次加载TempFile两次! (见代码)
重要必须是链接
bearbeiten1.html与bearbeiten3.html相同,只有alert ("bearbeiten3.html");
必须改编!!
<强> bearbeiten1.html 强>
<head>
<link href="file:///G:\Programme\Apache Group\Apache\htdocs\maor.css" rel="stylesheet" media="screen">
</head>
<body leftmargin="0" marginheight="0" marginwidth="0" topmargin="0" bgcolor="#1F2E53">
<script type="text/javascript">
alert ("bearbeiten1.html");
</script>
<table width="100%" border="0" cellspacing="0" cellpadding="0" >
<tr height="211">
<td width="2%" height="211"></td>
<td valign="top" width="36%" height="211">
<table width="448" border="0" cellspacing="0" cellpadding="0">
<tr height="21">
<td width="8" height="21"></td>
<td class="FormControlrechts" width="150" height="21"></td>
<td width="23" height="21"></td>
<td class="FormControl" width="213" height="21">
<p unselectable="on">Select any portion of the following blue text</p>
<p id="p1" style="color= #3366CC">My favorite Web site. Don't forget to click the button! createlink</p>
</td>
</tr>
</table>
</table>
</body>
<强> maor.css 强>
body {}
p {}
td {}
h1 { color: #f5c391; font-weight: normal; font-size: 20px; font-family: verdana, serif; margin-bottom: 0.2em }
h2 { color: #eaeaea; font-weight: normal; font-size: 16px; margin-top: 0; margin-bottom: 0 }
form { margin-top: 0px }
a:link { font-weight:bold; color:#36f; text-decoration:none; }
a:visited { font-weight:bold; color:silver; text-decoration:none; }
a:focus { font-weight:bold; color:#d4d4d4; text-decoration:underline; }
a:hover { font-weight:bold; color:#c0c0c0; text-decoration:none; }
a:active { font-weight:bold; color:lime; text-decoration:underline; }
textarea, input { font-size: 8pt }
select, option { font-size: 9pt }
td { color: #333; font-size: 9pt; font-family: verdana, sans-serif }
td.FormControl { color: #ffe78b; font-size: small; padding-top: 5px; padding-bottom: 5px; border-right: 1px solid #5dafb0; border-bottom: 1px solid #5dafb0 }
td.FormControlrechts { color: #a88664; font-size: 8pt; text-align: right; padding-top: 5px; padding-bottom: 5px; border-top: #5dafb0; border-right: #5dafb0; border-bottom: 1px solid #5dafb0; border-left: #5dafb0 }
.class { }
答案 2 :(得分:0)
在Delphi中显示HTML代码的最简单方法:
WebBrowser1.Navigate('about:'+yourHTMLcode);