parent component:
    import React from 'react';
    import './Api.scss';
    import ProfileCard from 'components/Card/ProfileCard.jsx';
    import Modal from 'react-awesome-modal';
    // import Search from 'components/Search/Search';
    class Api extends React.Component {
        constructor(props) {
            super(props);
            this.state = {
                title : '',
                content: '',
                img: '',
                data: [],
                pages: 0,
                page:0
            }
        }
        OnFileChange = (event) => {
            this.setState({img: event.target.files[0]});
        }
        onTitleChange = (event) => {
            this.setState({title: event.target.value})
        }
        onContentChange = (event) => {
            this.setState({content: event.target.value})
        }
        resetForm = () => {
            document.getElementById('title').value = '';
            document.getElementById('content').value = '';
            document.getElementById('img').value = '';
        }
        openModal() {
            this.setState({
                visible : true
            });
        }
        closeModal() {
            this.setState({
                visible : false
            });
        } 
        componentDidMount() {
            fetch(`http://127.0.0.1:8000/get_profile/?page=${this.state.page}`)
              .then(response => response.json())
              .then(res =>{
                this.setState({ data: res });  
                this.setState({ pages: res[res.length-1].pages });
                console.log(this.state.page)   
            });
          }
        SubmitProfile = (event) => {
            let formData = new FormData();
            formData.append('img',this.state.img);
            formData.append('title',this.state.title);
            formData.append('content',this.state.content);
            fetch('http://127.0.0.1:8000/post_profile/', {
                method: 'post',
                headers: {
                    Accept: 'application/json, text/plain, */*'
                  },
                  body:formData,
              })
              .then(response => response.json())
              .then(res => {
                  if (res.code === 200){
                    this.componentDidMount()
                    this.resetForm()
                    this.closeModal()
                  }
                  console.log(res);
              })
        }
        elasticSearch = (event) => {
            fetch('http://127.0.0.1:8000/search/', {
                method: 'post',
                headers:{'Content-Type': 'application/json'},
                body: JSON.stringify({
                    q: event.target.value 
                })
        })
        .then(response => response.json())
        .then(res => {
            console.log(res)
            this.setState({ data: res })
        });  
        }
        render(){
            return (
                <div className="api-body">
                    <section>
                        <div className="tc pa2">
                            <input
                                type="button"
                                className="br2 center ph3 pv2 input-reset ba b--black bg-transparent grow pointer f6 dib"
                                value="Post"
                                onClick={() => this.openModal()} 
                            />
                            <input
                                className="db ma3 q center border-box hover-black w-100 measure ba b--black-20 pa2 br2 mb2"
                                type="text"
                                name="q"
                                id="q"
                                onChange = {this.elasticSearch}
                            />
                            </div>
                            <Modal 
                                visible={this.state.visible}
                                width="400"
                                height="300"
                                effect="fadeInDown"
                                onClickAway={() => this.closeModal()}
                            >
                            <div className="mv3 pa3">
                            <label className="db fw6 lh-copy f6" htmlFor="password">Title</label>
                            <input
                                className="db border-box hover-black w-100 measure ba b--black-20 pa2 br2 mb2"
                                type="text"
                                name="title"
                                id="title"
                                onChange={this.onTitleChange}
                            />
                        </div>
                        <div className="mv3 pa3 mt-1">
                            <label htmlFor="comment" className="f6 b db mb2">Contents </label>
                            <textarea 
                                id="content" 
                                name="content" 
                                className="db border-box hover-black w-100 measure ba b--black-20 pa2 br2 mb2" 
                                aria-describedby="content-desc"
                                onChange={this.onContentChange}>
                            </textarea>
                        </div>
                        <div className="mv3 pa3 mt-1">
                        <input
                            type="file"
                            multiple = {false}
                            id="img"
                            name="img"
                            ref={(input) => { this.inpuElement = input; }}
                            accept=".jpg,.jpeg,.png,.pdf,.doc"
                            onChange={this.OnFileChange}
                            />
                        <input
                            type="button"
                            className="br2 center ph3 pv2 input-reset ba b--black bg-transparent grow pointer f6 dib"
                            value="Submit"
                            onClick={this.SubmitProfile} 
                            />
                        </div>
                        </Modal>
                    </section>
                   <ProfileCard 
                    data={this.state.data}
                    pages={this.state.pages}
                    page={this.state.page}
                    />
                </div>
            )
        }
    }
    export default Api;
child component:
    import React from 'react';
    class ProfileCard extends React.Component {
      constructor(props){
        super(props)
        this.state = {
          data : []
        }
      }
      deleteProfile = id => e => {
        fetch('http://127.0.0.1:8000/delete_profile/', {
          method: 'post',
          headers:{'Content-Type': 'application/json'},
          body: JSON.stringify({
            id: id
          })
        })
        .then(response => response.json())
        .then(res => {
            if (res.code === 200){
              this.componentDidMount()
            }
            console.log(res)
        })
      } 
      demoMethod(page){
        this.props.page(page)
        console.log(page)
      }
      render(){
      return (
        <div>
          {
          this.props.data.map((user,i) => {
            return (
              <article className='mw5 tc bg-white dib br3 pa3 ma3 pa4-ns mv3 ba b--black-10 shadow-5 pc-scroll pointer' key={i}>
              <div className="tc">
               <img 
                  src={"http://127.0.0.1:8000" + user.photo}
                  className="br-100 h3 w3 dib" 
                  alt="profile pic"
                  onDoubleClick = {this.deleteProfile(user.id)}
              />
                 <h1 className="f4">{user.title}</h1>
                 <hr className="mw3 bb bw1 b--black-10" />
               </div>
               <p className="lh-copy measure center f6 black-70">
               {user.content}
               </p>
             </article>
            );
          })
        }
          <div className="pagination">
            <center>
                {[...Array(this.props.pages+1)].map((x, i) =>
                  <h2 key={i} onClick={()=>this.demoMethod(i+1)} className="tc">{ i+1 }</h2>
                )}
            </center>
          </div>
        </div>
      );
      }
    }
    export default ProfileCard;
I wants to send data from child to parent component. in child component i have one demoMethod() from that method i wants to send page data to parent component constructor(state).
This way it is not working. And showing this.props.page(page) is not a function
Please have a look into this.
 
     
     
     
    