react native - Undefined is not an object (evaluating 'this.fetchData().then') -


native function draw scene inside main render. error title of question ( undefined not , object...)

this function block : 

 fetchdata() {          const { params } = this.props.navigation.state;                               fetch(request_url+'&'+'cabnum='+params.cabreg)          .then((response) => response.json())          .then((responsedata) => {                          //alert(params.cabreg);               alert.alert('','your driver :'+responsedata[0].driver);              return responsedata;                  }).done();          }

and main render :

render() {              const { params } = this.props.navigation.state;                             return (                  <view>                      <text>{params.cabreg}</text>                      <view>{this.fetchdata()                              .then((responsedata)=>{                                                                      return(<view style={styles1.rightcontainer}>                                               <image source={{uri: responsedata[0].image}} style={styles1.thumbnail} />                                               <view style={{flexdirection:'column',alignitems:'center'}}>                                                  <text style={styles1.title}>{responsedata[0].reg}</text>                                                  <text style={styles1.driver}>driver:{responsedata[0].driver}</text>                                                  <text style={styles1.driver}>cab type:{responsedata[0].ctype}</text>                                                  <text style={styles1.driver}>contact:{responsedata[0].contact}</text>                                              </view>                                              </view>                                              );                                      }                              )                            }                      </view>                  </view>              );           }

this not correct way of rendering response data view.

try this: 

render() { const { params } = this.props.navigation.state  return (     <view>         <text>             {params.cabreg}         </text>         <view>             {this.fetchdata()}         </view>     </view> ) }

and function : 

fetchdata() { const { params } = this.props.navigation.state  fetch(request_url + '&' + 'cabnum=' + params.cabreg)     .then(response => response.json())     .then(responsedata => {         //alert(params.cabreg);         alert.alert('', 'your driver :' + responsedata[0].driver)         return (             <view style={styles1.rightcontainer}>                 <image                     source={{ uri: responsedata[0].image }}                     style={styles1.thumbnail}                 />                 <view style={{ flexdirection: 'column', alignitems: 'center' }}>                     <text style={styles1.title}>                         {responsedata[0].reg}                     </text>                     <text style={styles1.driver}>                         driver:{responsedata[0].driver}                     </text>                     <text style={styles1.driver}>                         cab type:{responsedata[0].ctype}                     </text>                     <text style={styles1.driver}>                         contact:{responsedata[0].contact}                     </text>                 </view>             </view>         )     })     .done() }

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