WAB uses AGOL to control pop-up behavior and inspecting an app reveals that the pop-up CSS is being read from http://js.arcgis.com/3.14/esri/css/esri.css which means I cant directly edit it. I dont know much about web development, can I edit the style somewhere in the app directories to override the esri style and make a pop-up larger?
Chris,
I normally do this kind of stuff in the MapManager.js
The app will have one layer that lets you get a snap shot from a traffic camera in the popup.
Depends if you want it resized for everything or just something specific.
Where? main.js?
Just use this line of code:
this.map.infoWindow.resize(360,280);
Developer Edition
Are you using the developer edition or AGOL version?
I would also consider moving this question to Web AppBuilder for ArcGIS
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