当数组为空时扑出显示空间[]

Posted 2021-05-03

在我的屏幕上，数据[index] ['text']在没有值时显示[]。不存在时如何显示空格而不是[]？

 return ListTile(
             title: html(data: """<br> """ + data[index]['id'] + ' - ' + data[index]['value'] + ' - ' + """ <b> """ + (data[index]['text']) + """ </b> """ + """ """),
             trailing: Icon(Icons.keyboard_arrow_right),
             onTap: () => Navigator.pushNamed(context, '/approve', arguments:
 data[index]['id'].toString()),
           isThreeLine: false,
           dense: true,
           );

答案

return ListTile(
             title: Html(data: """<br> """ + data[index]['id'] + ' - ' + data[index]['value'] + ' - ' + """ <b> """ + (data[index]['text'] != null ? data[index]['text'] : " " )  + """ </b> """ + """ """),
             trailing: Icon(Icons.keyboard_arrow_right),
             onTap: () => Navigator.pushNamed(context, '/approve', arguments:
 data[index]['id'].toString()),
           isThreeLine: false,
           dense: true,
           );