javascript - How can I remove a component using the children prop in React -


i trying achieve scenario:

  1. i have foo component bar prop

  2. if bar prop true --> mount bar component inside foo component

  3. if bar prop false --> unmount bar component
  4. i don't want example component aware of show/hide, want foo know when show or hide it
  5. bar not necessary direct child of foo, can nested deeper in children of foo 
const example = () => {   return (     <foo bar={true/false}>       <div>some div</div>       <bar></bar>     </foo>   ) };  class foo extends react.component {    componentwillreceiveprops({bar}) {     if (bar) {       /* want show bar!! */     } else {       /* want remove bar!! */       /* maybe doing like: this.props.children.searchforbar().removenode() */     }   }    render () {     return (       <div>{this.props.children}</div>     )   } };  const bar = () => 'i bar';

i've tried manipulate this.props.children react blocked me modifying children myself.

do need maybe outer service communication between these 2 components ?

should use context maybe ?

looking advice on how approach issue.

one of possible solutions use kind of message bus or pubsub. in kind of approach, bar component have subscribe bus, , show/hide itself. foo component publish appriopriate messages in componentwillreceiveprops. more: here


Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more