Documentation

onBeforeFileAdd

fires the moment you try to add file to uploader

void onBeforeFileAdd(){ ... };

Example

$$("uploader_1").attachEvent("onBeforeFileAdd", function(item){
                var type = item.type.toLowerCase();
                if (type != "jpg" && type != "png"){
                    webix.message("Only PNG or JPG images are supported");
                    return false;
                    }
                });

See also

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