set the value null before entering into a condition












1















I want to clear a value when backspace or null value clicked. The first selected value is set always when we click backspace



 onValueChange(e,value)
{
if(e.target === undefined){
this.setState({value:e});
}
else
{
this.setState({value:e.target.value})
}

const { patientsMasterData, addPatientForm } = this.props;
let selectedRefValue = patientsMasterData.ReferredBy.filter(o=> o.RefName === (value.options));
if(selectedRefValue.length !== 0) {

addPatientForm.values.ReferredBy = selectedRefValue[0].RefID;
}
else{
addPatientForm.values.ReferredBy = null;
}
}


How to set the value first as null?










share|improve this question



























    1















    I want to clear a value when backspace or null value clicked. The first selected value is set always when we click backspace



     onValueChange(e,value)
    {
    if(e.target === undefined){
    this.setState({value:e});
    }
    else
    {
    this.setState({value:e.target.value})
    }

    const { patientsMasterData, addPatientForm } = this.props;
    let selectedRefValue = patientsMasterData.ReferredBy.filter(o=> o.RefName === (value.options));
    if(selectedRefValue.length !== 0) {

    addPatientForm.values.ReferredBy = selectedRefValue[0].RefID;
    }
    else{
    addPatientForm.values.ReferredBy = null;
    }
    }


    How to set the value first as null?










    share|improve this question

























      1












      1








      1








      I want to clear a value when backspace or null value clicked. The first selected value is set always when we click backspace



       onValueChange(e,value)
      {
      if(e.target === undefined){
      this.setState({value:e});
      }
      else
      {
      this.setState({value:e.target.value})
      }

      const { patientsMasterData, addPatientForm } = this.props;
      let selectedRefValue = patientsMasterData.ReferredBy.filter(o=> o.RefName === (value.options));
      if(selectedRefValue.length !== 0) {

      addPatientForm.values.ReferredBy = selectedRefValue[0].RefID;
      }
      else{
      addPatientForm.values.ReferredBy = null;
      }
      }


      How to set the value first as null?










      share|improve this question














      I want to clear a value when backspace or null value clicked. The first selected value is set always when we click backspace



       onValueChange(e,value)
      {
      if(e.target === undefined){
      this.setState({value:e});
      }
      else
      {
      this.setState({value:e.target.value})
      }

      const { patientsMasterData, addPatientForm } = this.props;
      let selectedRefValue = patientsMasterData.ReferredBy.filter(o=> o.RefName === (value.options));
      if(selectedRefValue.length !== 0) {

      addPatientForm.values.ReferredBy = selectedRefValue[0].RefID;
      }
      else{
      addPatientForm.values.ReferredBy = null;
      }
      }


      How to set the value first as null?







      reactjs






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 26 '18 at 8:55









      Mily AlfradMily Alfrad

      156216




      156216
























          0






          active

          oldest

          votes











          Your Answer






          StackExchange.ifUsing("editor", function () {
          StackExchange.using("externalEditor", function () {
          StackExchange.using("snippets", function () {
          StackExchange.snippets.init();
          });
          });
          }, "code-snippets");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "1"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: true,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: 10,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53477559%2fset-the-value-null-before-entering-into-a-condition%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          0






          active

          oldest

          votes








          0






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Stack Overflow!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53477559%2fset-the-value-null-before-entering-into-a-condition%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          Create new schema in PostgreSQL using DBeaver

          Deepest pit of an array with Javascript: test on Codility

          Costa Masnaga