javascript – React.js — How to pass properties object to child component?-ThrowExceptions

Exception or error:

I have a component called tileGroup that has a property that is a collection(array) of other properties.

The parent component(tileGroup) renders a list of child components by using each set of properties in the collection to create a new component.

Right now I am individually mapping each property from the set to the child component but this will become cumbersome if the property count for a component increases and I’m sure there is a cleaner, simpler way to do it…

How can I pass the full set of properties on to the child component without remapping each property?

Example code:

tileGroupData = {someProperty: 'something', someOtherProperty:'something', 
                tiles: [{vsize:1, hsize:2, etc...}, {vsize:2,hsize:3,title:'whatever'}]};

and then component creation..

var tileGroup = React.createClass({
    render: function() {
       var thechildren = this.props.tiles.map(function(tile)
       {
           //this is what I DON'T want to be doing. 
           return <tileSimple vsize = {tile.vsize} hsize = {tile.hsize} content = {tile.content}/>;

           //what I DO want to be doing
           return <tileSimple allTheProps = {tile}/>; 
       });
How to solve:

Apparently transferPropsTo is being deprecated. With recent versions of React you can use JSX spread attributes:

return <tileSimple {...tile} />;

More info about this here: Deprecating transferPropsTo

###

For those use cases, the easiest thing is to fallback to the JS API instead of JSX.

return tileSimple(tile);

To understand why it works, look at the generated version of the version you want using the JSX Compiler tool ( http://facebook.github.io/react/jsx-compiler.html )

<tileSimple vsize = {tile.vsize} hsize = {tile.hsize} content = {tile.content}/>;
tileSimple( {vsize:  tile.vsize, hsize:  tile.hsize, content:  tile.content});

###

You can actually just do the following in your render

return this.transferPropsTo(<tileSimple />);

###

What you propose doing,

return <tileSimple allTheProps={tile} />;

works just fine.

Within the tileSimple component you should then be able to access the properties using syntax like,

var vsize = this.props.allTheProps.vsize;
var hsize = this.props.allTheProps.hsize;

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