Delphi中Chrome Chromium、Cef3学习笔记

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Delphi中Chrome Chromium、Cef3学习笔记

来源: 作者: 时间:2016-01-23 10:15 【

Delphi与JS的交互问题:一、执行简单的JS上一篇已经讲过:chrm1 browser MainFrame ExecuteJavaScript( alert( "abc "); , about:blank ,0);chrm1 browser MainFrame ExecuteJavaScript( function aaa

Delphi与JS的交互问题:

一、执行简单的JS

上一篇已经讲过:

chrm1.browser.MainFrame.ExecuteJavaScript('alert("abc");','about:blank',0);

chrm1.browser.MainFrame.ExecuteJavaScript('function aaa(){alert("abc");}aaa();','about:blank',0);

 

二、注入自定义的JS

首先必须在网页加载完成之后,才可以执行,不能为空页面!

str_js := 'var oScript = document.createElement( "script" );oScript.id = "sid";alert(oScript.id);';
chrm1.browser.MainFrame.ExecuteJavaScript(str_js,'about:blank',0);

 

三、与JS交互(通过ceflib实现)

Cef3的Demo里面,有一个cefclient的例子,可以看下,关键代码:

 

TExtension = class(TCefv8HandlerOwn)
private
FTestParam: ustring;
protected
function Execute(const name: ustring; const obj: ICefv8Value;
const arguments: TCefv8ValueArray; var retval: ICefv8Value;
var exception: ustring): Boolean; override; //重写Execute事件
end;



//通过不同的name,执行不同的动作
function TExtension.Execute(const name: ustring; const obj: ICefv8Value;
const arguments: TCefv8ValueArray; var retval: ICefv8Value;
var exception: ustring): Boolean;
begin
if(name = 'SetTestParam') then
begin
// Handle the SetTestParam native function by saving the string argument
// into the local member.
if (Length(arguments) <> 1) or (not arguments[0].IsString) then
begin
Result := false;
Exit;
end;
FTestParam := arguments[0].GetStringValue;
Result := true;
end
else if(name = 'GetTestParam') then
begin
// Handle the GetTestParam native function by returning the local member
// value.
retval := TCefv8ValueRef.CreateString(Ftestparam);
Result := true;
end
else if (name = 'GetTestObject') then
begin
// Handle the GetTestObject native function by creating and returning a
// new V8 object.
retval := TCefv8ValueRef.CreateObject(nil);
// Add a string parameter to the new V8 object.
retval.SetValueByKey('param', TCefv8ValueRef.CreateString(
'Retrieving a parameter on a native object succeeded.'));
// Add a function to the new V8 object.
retval.SetValueByKey('GetMessage',
TCefv8ValueRef.CreateFunction('GetMessage', Self));
Result := true;
end
else if(name = 'GetMessage') then
begin
// Handle the GetMessage object function by returning a string.
retval := TCefv8ValueRef.CreateString(
'Calling a function on a native object succeeded.');
Result := true;
end else
Result := false;
end;


{ 注册JS扩展 }

procedure RegisterExtension;
var
Code: string;
begin
Code :=
'var cef;if(!cef)cef={};if(!cef.taobao)cef.taobao={};(function(){cef.taobao.test_object=function(){native function GetTestObject();return GetTestObject();};})();';
if Code <> '' then
try
CefRegisterExtension('example/v8',Code,TExtension.Create as ICefv8Handler);
except
end;
end;

在FormCreate中注册类:
RegisterExtension;

 

调用实例:

。。。。。。。待续

chrm1.browser.MainFrame.ExecuteScript('alert("abc");','about:blank',0);
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