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、delphi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.ExecuteJavaScript(‘alert("abc");‘,‘about:blank‘,0);