javascript - REACT: JSON Tree with the help of Recursion -


the json backend guys provide me multiple parent child have put dynamic loop show parent child.

json

"data": [   {     "id": 25,     "slug": "mobiles",     "parent_id": null,     "name": "mobiles"   },   {     "id": 26,     "slug": "mobile-phones-accessories",     "parent_id": 25,     "name": "mobile phones accessories"   },   {     "id": 27,     "slug": "computer-laptop",     "parent_id": null,     "name": "computer & laptop"   },   {     "id": 28,     "slug": "laptops",     "parent_id": 27,     "name": "laptops"   },   {     "id": 29,     "slug": "mobile-phones",     "parent_id": 26,     "name": "mobiles phone"   } ]

my function (kindly ignore this. it's try have got 1 child parent)

rendercategorieshtml() {   const { categories } = this.props;    if (!categories) return false;    const nullcat = [];   categories.map((obj) => {     if (obj.parent_id == null) {       nullcat.push(obj);     }   });    return nullcat.map(     (parentcat, i) => (       <div classname="form-group" key={i}>         <div classname="checkbox" key={i}>           <label>             <field               name={`categories.${parentcat.id}`}               component="input"               type="checkbox"             />             {parentcat.slug}           </label>         </div>         {           categories.map(             (childcat, j) => (               parentcat.id == childcat.parent_id ?                 <div classname="checkbox ml-20" key={j}>                   <label>                     <field                       name={`categories.${childcat.id}`}                       component="input"                       type="checkbox"                     />                     {childcat.slug}                   </label>                 </div>                 : ''             )           )         }       </div>     )   ); }

i want (that dynamic html want)

<ul>   <li>mobiles</li>   <ul>       <li>mobile-phones-accessories</li>       <ul>           <li>mobile-phones</li>       </ul>   </ul>               <li>computer-laptop</li>   <ul>       <li>laptops</li>   </ul>     </ul>

try this:

class treerender extends react.component {   state = {     data: json.parse('[{"id": 25,"slug": "mobiles","parent_id": null,"name": "mobiles"},{"id": 26,"slug": "mobile-phones-accessories","parent_id": 25,"name": "mobile phones accessories"},{"id": 27,"slug": "computer-laptop","parent_id": null,"name": "computer & laptop"},{"id": 28,"slug": "laptops","parent_id": 27,"name": "laptops"},{"id": 29,"slug": "mobile-phones","parent_id": 26,"name": "mobiles phone"}]')   }   getcurrent = (node) => this.state.data.filter(cnode => cnode.parent_id == node).map(cnode => (     <ul key={`node_${cnode.id}`}>       <li>{cnode.name}</li>       {this.getcurrent(cnode.id)}     </ul>   ))    render() {     return (       <div>         {this.getcurrent(null)}       </div>     );   } }

fiddle


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