javascript - Access variable on child from parent in react.js -

-

i trying access variable "name" in child class parent class. using react routers on project. i've been using react few days, open suggestions or refactoring.

child class:

import react 'react'; import reactdom 'react-dom'; import { link } 'react-router';  export default react.createclass({ render: function() {     return (        <ul classname="list">             {this.props.business.map(function(business, i) {                     let name = object.keys(business).length - 1;                     return (                         <li key={business.id}>                             <link to="/" classname="inner">                                 <div classname="li-img">                                     <img src={business.image} alt="image alt text" />                                 </div>                                 <div classname="li-text">                                     <h4 classname="li-head">{business.name}</h4>                                     <p classname="li-sub">summary of content</p>                                 </div>                             </link>                        </li>                     );                 })}         </ul>     ) } });

parent class:

import react 'react'; import business './businesses'; import { getbusiness } 'api/global';  export default react.createclass({   getinitialstate: function() {     return {         business: [],     } },   componentwillmount: function() {       var _this = this;        getbusiness().then(function(response) {           _this.setstate({             business: response.data         })     }).catch(function(err) {         console.error(err);     }); },    render: function() {     return (         <business business={this.state.business} text={name} />     )    } });

i don't think can do, directly, attempting here.

at time render business need know values want pass it. "construct" asking "i want pass parameter function calculated function calling".

communication between components gives hint @ needed: event causes re-render after new value (name) has been computed.

this business updating state variable name, cause re-render, or passing in callback (as example shows).


Comments

Post a Comment

Popular posts from this blog

mysql - Dreamhost PyCharm Django Python 3 Launching a Site -

-
i'm new python/django , created simple django website using pycharm. site works fine running on computer, i'm lost when comes taking site onto host (dreamhost). i'm able upload files correct directories fine, , believe made correct changes database on mysql. i'm not sure go there though. right now, page shows files rather site. direction appreciated. much! you should not run django application using python manage.py runserver on production. how run application on django depends on server (apache, nginx) want use for apache - https://docs.djangoproject.com/en/1.10/howto/deployment/wsgi/modwsgi/ for nginx - https://www.digitalocean.com/community/tutorials/how-to-serve-django-applications-with-uwsgi-and-nginx-on-ubuntu-14-04 the mysql database should, of course, exist , have correct credentials. or, if choose use sqlite, file should accessible, readable , writable www-user (may different depending on linux distributive)
Read more

java - Sending SMS with SMSLib and Web Services -

-
i have made rest web service send smss using hsdpa usb modem. using smslib in java send smss. every time web service invoked, create gateway start service, send message, stop service , remove gateway. takes 20 seconds each message. found starting service takes lot of time. part of code use send smss service.getinstance().addgateway(gateway); service.getinstance().startservice(); outboundmessage msg = new outboundmessage(phonenumber, message); if (service.getinstance().sendmessage(msg)) { result = "message sent successfully!!"; } else { result = "could not send message."; } service.getinstance().stopservice(); service.getinstance().removegateway(gateway);//remove gateway is there way can start service once if not started , use send message when ever web service invoked? why dont group messages , send in 1 go? service.getinstance().sendmessages(messa...
Read more

java - How to resolve The method toString() in the type Object is not applicable for the arguments (InputStream) -

-
i'm trying read json file local machine. @path("/") public class jsonparsing { file f = new file("file.json"); if (f.exists()){ inputstream = new fileinputstream("file.json"); string jsontxt = ioutils.tostring(is); system.out.println(jsontxt); jsonobject json = new jsonobject(jsontxt); string = json.getstring("1000"); system.out.println(a); } } but i'm getting error in tostring() method. possible read .txt file containing json object local machine? if possible, how done? firstly: whenever ask question- add imports well. secondly: yes possible read .txt file containing json object. steps: 1. add maven dependency in pom.xml - <dependency> <groupid>com.googlecode.json-simple</groupid> <artifactid>json-simple</artifactid> <version>1.1.1</version> </dependency> or add jar of dependency. 2.import...
Read more