javascript - ReactJs, Generating events outside of reactjs app -
while trying out reactjs, facing below design issue:
below simple html trying simulate chat app, building list of online members , trying work out code add new members list.
the below react app consists of following class in dom hierarchy.
chatapp > memberlist > member
in react class chatapp, able use setinterval update members collection , generate new dom new member, want try same outside chatapp class.
so have added button 'add member' , call function on click in turn add new member list.
but, how should instance of react chatapp , setstate method outside of react app?
<html> <head> <style> .onlinelist{ width:300px; height:500px; display:inline-block; overflow:auto; border:1px solid lightgray; } .onlinelist a{ display:inline-block; width:100%; padding:10px; box-sizing:border-box; text-decoration:none; color:gray; font-weight:bold; border-top:1px solid lightgray; border-bottom:1px solid lightgray; } .onlinelist a:hover{ color:black; background-color:lightgray; } </style> <script src="js/jquery-1.11.3.min.js"></script> <script src="js/react-with-addons.js"></script> <script src="js/jsxtransformer.js"></script> <script> function addnewmember(){ // how can setstate in chatapp react class called here? } </script> </head> <body> <button onclick="addnewmember()">add new member</button> <div id="chatapp"></div> <script type="text/jsx"> var member = react.createclass({ render: function() { return <a href='#'>{this.props.memberinfo}</a>; } }); var memberlist = react.createclass({ render: function(){ var membersdom = []; for(var m=0; m < this.props.members.length;m++){ membersdom.push(<member memberinfo={this.props.members[m].name}/>); } return ( <div id='onlinelist' classname={'onlinelist'}>{membersdom}</div> ) } }); var chatapp = react.createclass({ getinitialstate: function(){ var members = { members: [] }; for(var m=0;m<1;m++){ members.members.push({name: m + 1}); }; /* setinterval(function(){ members.members.push({name: members.members.length + 1 }); this.setstate(members); }.bind(this),2000); */ return members; }, render: function(){ return ( <div id='container'> <memberlist members={this.state.members}/> </div> ) } }) react.render( <chatapp/>, document.getelementbyid('chatapp') ); </script> </body> </html>
you're never supposed set component's state outside of component.
a react app should set hierarchy of components, top-level component managing state of children. if want functionality outside of chatapp, need move button parent component, along state want modify , addnewmember handler. pass state chatapp props, memberlist.
that being said, there's no reason why couldn't include button , addnewmember in chatapp:
addnewmember: function (e) { e.preventdefault(); var name = this.state.members.length + 1; var members = this.state.members; this.setstate({ members: members.concat([{name: name}]) }); }, render: function(){ return ( <div> <button onclick={this.addnewmember}>add new member</button> <div id='container'> <memberlist members={this.state.members}/> </div> </div> ) } also, isn't directly related question, shouldn't call setstate in getinitialstate. purpose instantiate component's state, since invoked once, before component rendered, , doesn't trigger re-render other lifecycle methods.
so in example, return empty members array. then, if wanted add members setinterval, settimeout, or async process, in componentdidmount. using addnewmember above, (make sure account e if run it):
getinitialstate: function () { return { members: [] }; }, componentdidmount: function () { setinterval(this.addnewmember, 2000); } anyway, hope helps. feel free ask me questions. i'd happy go more detail structuring more complex react apps , best practices.
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