I tried to use jQuery-QueryBuilder (downloaded version) without BootStrap. I did as the "No Bootstrap" tutorial showed on the official website (tutorial). However, the icon for the add_rule button didn't show even though I had set the "icons" property for the querybuilder instance. Thus, I examed the query-builder.standalone.js and found out that a ".add_rule" symbol was missing from the html template for the add_rule button after referencing the icons property (somewhere around line 2817 in the downloaded version of query-builder.standalone.js).
I tried to use jQuery-QueryBuilder (downloaded version) without BootStrap. I did as the "No Bootstrap" tutorial showed on the official website (tutorial). However, the icon for the add_rule button didn't show even though I had set the "icons" property for the querybuilder instance. Thus, I examed the query-builder.standalone.js and found out that a ".add_rule" symbol was missing from the html template for the add_rule button after referencing the icons property (somewhere around line 2817 in the downloaded version of query-builder.standalone.js).