[英]How can I run a <script> tag that I just inserted dynamically from a BHO
I'm completely new to developing IE extensions with Browser Helper Objects. 我非常擅长使用Browser Helper Objects开发IE扩展。
I managed to create a BHO that successfully inserts a script tag that references a javascript file in the head of the HTML page (see code below). 我设法创建了一个BHO,它成功地插入了一个脚本标记,该标记引用了HTML页面头部的javascript文件(参见下面的代码)。
But the script tag just sits there in the DOM and the external javascript file is not executed. 但是脚本标记只是位于DOM中,并且不执行外部javascript文件。
Is there any way to tell the browser to run the external javascript file? 有没有办法告诉浏览器运行外部JavaScript文件?
Thanks! 谢谢!
Code Details: I call the following method on the OnDocumentComplete event: 代码详细信息:我在OnDocumentComplete事件上调用以下方法:
void CHelloWorldBHO::InsertScriptTag(IDispatch* pDispDoc)
{
HRESULT hr = S_OK;
// query for an HTML document.
CComQIPtr<IHTMLDocument3> pDocument3 = pDispDoc;
CComQIPtr<IHTMLDocument2> pDocument2 = pDispDoc;
if (pDocument2 != NULL && pDocument3 != NULL)
{
// ********************** create our script tag Element (pHtmlElem) ****************************
IHTMLElement* pHtmlElem;
CComVariant vAlert="http://www.gnpcb.org/esv/share/js/?action=getDailyVerse"; // example referencing external JS code
CComVariant vJavascript="text/javascript";
hr = pDocument2->createElement(_T("script"), &pHtmlElem);
if (SUCCEEDED(hr) && pHtmlElem != NULL)
{
hr = pHtmlElem->setAttribute(_T("type"), vJavascript);
hr = pHtmlElem->setAttribute(_T("src"), vAlert);
}
// ********************** insert Element (pHtmlElem) in HTML Head ****************************
// Get the head from the DOM.
static const CComBSTR sbstrHead(L"head");
CComPtr<IHTMLElementCollection> objects;
hr = pDocument3->getElementsByTagName(sbstrHead, &objects);
if(SUCCEEDED(hr) && objects != NULL)
{
// Get the number of elements in the collection.
long nElements = 0;
hr = objects->get_length(&nElements);
if (hr == S_OK && nElements > 0)
{
CComVariant svarItemIndex(0); // we will get the first element
CComVariant svarEmpty;
CComPtr<IDispatch> spdispElement;
// Get the element out of the collection with index 0 (the first element, that is, the head)
hr = objects->item(svarItemIndex, svarEmpty, &spdispElement);
if (hr == S_OK && spdispElement != NULL)
{
CComQIPtr<IHTMLDOMNode, &IID_IHTMLDOMNode> spHeadNode = spdispElement; // query for DOM interfaces
CComQIPtr<IHTMLDOMNode, &IID_IHTMLDOMNode> spNodeNew;
spNodeNew = pHtmlElem;
if (spHeadNode)
{
spHeadNode->appendChild(spNodeNew, NULL);
}
}
}
}
}
} }
You should use execScript instead of appendChild. 您应该使用execScript而不是appendChild。 And the syntax of what you need to exec is very, very wierd . 你需要执行的语法是非常非常奇怪的 。 But it accomplishes what you want -- namely, an external JavaScript is added to the DOM. 但它完成了你想要的 - 即,一个外部JavaScript被添加到DOM。 Call this during OnDocumentComplete: 在OnDocumentComplete期间调用此方法:
VARIANT vrt = {0};
CComQIPtr<IHTMLWindow2> win;
spHTMLDoc->get_parentWindow(&win);
CComBSTR bstrScript = L"var html_doc = document.getElementsByTagName('head')[0]; var _js = document.createElement('script'); _js.setAttribute('type', 'text/javascript'); _js.setAttribute('id', 'bho_js'); _js.setAttribute('src', 'http://domain.com/script.js'); if(!document.getElementById('bho_js')) html_doc.appendChild(_js);";
CComBSTR bstrLanguage = L"javascript";
HRESULT hrexec = win->execScript(bstrScript,bstrLanguage, &vrt);
This will add <script type="text/javascript" id="bho_js" src="http://domain.com/script.js"></script>
into the DOM HEAD. 这会将<script type="text/javascript" id="bho_js" src="http://domain.com/script.js"></script>
到DOM HEAD中。
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