apex:includeScript with loadOnReady=true fails to load target script on Google Chrome current version
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apex:includeScript with loadOnReady=true fails to load target script on Google Chrome current version

Apex , Sites , Communities

Last updated 2020-01-04 ·Reference W-6452289 ·Reported By 5 users

Fixed - Spring '20

pex:includeScript with loadOnReady=true fails to load target script on Google Chrome current version(76 and not earlier versions) when Click jack Protection Level of Site is set as "Don't allow framing by any page (Most protection)"

- Steps to reproduce
1. Create a Static Resource which has the following java script code
Name : W6445703
2. Create the following Visualforce page
Name : W6445703
<apex:page >
<apex:includeScript value="{!URLFOR($Resource.W6445703)}" loadOnReady="true"/>

3. Preview the above Visualforce

You will see alert dialog is shown with "hi". This is expected.

3. Create a Visualforce tab with the above Visualforce page

4. Configure a Community with the above Visualforce tab

5. Configure Clickjack Protection Level of the Community(Site) as "Don't allow framing by any page (Most protection)"

6. Access to the Community and go to the Visualforce tab which was created as Step 3

You will see alert dialog is not shown. This is unexpected.

- Looks like this is caused by Chrome's behavior change.
- The onerror/onload events of OBJECT element became to not be fired when the referenced URL from OBJECT responded X-Frame-Options: deny.
- As the result, this behavior change was introduced.
- The behavior change itself was already reported as a Chrome bug.

------Workaround ---
Add the following javascript code to the VF page
Sfdc.Resource.cacheScripts=function(scripts, onComplete) {
var cached = 0;
var length = scripts.length;
var cacheMethod = function(url, onComplete) {
Sfdc.Dom.create(null, { onload: onComplete, onerror: onComplete, src: url}, "IMG");

onComplete = onComplete || Sfdc.Function.blank();
var onScriptCached = function() { if(++cached === length) { onComplete(); } };

for(var c=0, currentScript;c<length;c++){
currentScript = scripts[c];
if(currentScript) {
cacheMethod(currentScript, onScriptCached);
} else {
// Local script, already got it.

Is it Fixed?

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