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[template check field exists] #golang
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| //https://stackoverflow.com/a/19294004/1215930 | |
| type Data []interface{} | |
| func (p Data) HasField(name string, value interface{}) bool { | |
| for _, v := range p { | |
| if m, ok := v.(map[string]interface{}); !ok { | |
| return false | |
| } else if _, ok := m[name]; ok && reflect.DeepEqual(m[name], value) { | |
| return true | |
| } | |
| } | |
| return false | |
| } | |
| {{$hasFemale := .HasField "sex" "F"}} | |
| {{if $hasFemale}}Female: | |
| {{range .}}{{if eq .sex "F"}}{{.name}}{{end}}{{end}} | |
| {{end}}` |
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| //https://stackoverflow.com/questions/34703133/field-detection-in-go-html-template | |
| func hasField(v interface{}, name string) bool { | |
| rv := reflect.ValueOf(v) | |
| if rv.Kind() == reflect.Ptr { | |
| rv = rv.Elem() | |
| } | |
| if rv.Kind() != reflect.Struct { | |
| return false | |
| } | |
| return rv.FieldByName(name).IsValid() | |
| } | |
| {{if hasField . "FieldA"}}<a>{{.FieldA}}</a>{{end}} |
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