React handleChange push values in nested object

Question

I've got a handleChange event that pushes data into the props

handleChange = input => e => {
    let target = e.target,
        type = target.type,
        value = target.value;

    this.setState({ 
        [input]: (type === "checkbox" ? target.checked : value) 
    });
};

in the input, I handle the change onChange={onChange('services.cleaning')} Is there anyway i can push the data in the props as a nested object instead of as "services.cleaning"?

The onchange event

<Checkbox onChange={onChange('services.cleaning')} type='checkbox' name='cleaning' />

Will the depth of the nested prop always be equal to 2 ? can you have something like this 'prop1.prop2.prop3' ? — Olivier Boissé
– Olivier Boissé, Commented May 8, 2019 at 10:53

Olivier Boissé · Accepted Answer · 2019-05-08 11:37:15Z

1

Here is one possible solution:

First, you need to create a new object (shallow copy) of this.state.services
Then you update the prop cleaning of this nested object
Lastly you update the state with this.setState({services: nestedObjectCreated})

Here is the corresponding code :

handleChange = propKey => e => {
   const {target} = e;
   const {type, value} = target;
   const newValue = type === "checkbox" ? target.checked : value

   const [firstProp, ...otherProps] = propKey.split('.');

   if (!otherProps.length) {
      return this.setState({[firstProp] newValue});
   }

   const nestedObject = {...this.state[firstProp]};
   otherProps.reduce(
       (acc, val, index) => {
          if (index < otherProps.length - 1) {
             return acc[val];
          }
          acc[val] = newValue;,
       },
       nestedObject
   );

   this.setState({[firstProp]: nestedObject});
};

answered May 8, 2019 at 11:37

Olivier Boissé

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1 Comment

ekclone Over a year ago

wow this is exactly what I needed, and thanks for explaining the solution, much love

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