Promoted Links app Behaviour=Dialog Question

Question

Greetings all. I have an issue with the Promoted Links app.  Here is the situation:
Site Collection created as a Publishing Site
Home changed to Page Layout – Blank Web Part Page
Have a Promoted Links app (titled Networking Actions) that has 1 item in it. This item opens a custom list from the site in dialog (Launch Behavior = Dialog).
This action works fine if I just open the Networking Actions app from all site content and click on the tile (it opens the list in dialog).
I add the Networking Actions app to the home page in a web part zone.
I click on the tile to open the list, nothing happens and I get the lovely exclamation ERROR ON PAGE in the lower left hand corner.
I change the Launch Behavior to NEW TAB or IN PAGE NAVIGATION and it works fine from the home page.
All security for all items on the site is setup to inherit from the site. Doesn’t matter where the user account is setup (Owner, Member or Visitor) it still will not work when launched from the web part zone.
I’d appreciate any thoughts or suggestions.  The Promoted Links app is super great, unless the dialog isn’t going to work as advertised.

Answer 1

Hi ,
Promoted link webpart ,launch behavior is working fine in designer log in.
But for visitor sign in ,throws error
"sp.res.defaultdialogwidth is null or not an object ".
<script type="text/javascript">
if(typeof SP.UI.ModalDialog === 'undefined'){
    var script=document.createElement('script');
    script.setAttribute("type","text/javascript");
script.setAttribute("src", "https://cdn.sharepointonline.com/3820/_layouts/15/sp.ui.dialog.js");
    document.getElementsByTagName("head")[0].appendChild(script);
</script>
Above highlighted  url  error speciifies that url
"sp.res.defaultdialogwidth is null or not an object ".