Kuunganisha Viingizo kwa Kitu katika React

Acha kwenye hali hifadhiwe kitu:

jsxconst initObj = {
  prop1: 'value1',
  prop2: 'value2',
  prop3: 'value3',
}

function App() {
  const [obj, setObj] = useState(initObj);
  
  return <div>
    {obj.prop1}-{obj.prop2}-{obj.prop3}
  </div>;
}

Wacha tuonyeshe kila sifa ya kitu chetu katika kizingilio tofauti:

jsxfunction App() {
  const [obj, setObj] = useState(initObj);
  
  return <div>
    <input value={obj.prop1} />
    <input value={obj.prop2} />
    <input value={obj.prop3} />
    
    <br />
    {obj.prop1}-{obj.prop2}-{obj.prop3}
  </div>;
}

Sasa tuiunganishe kila kizingilio tukio onChange. Kama kichakataji tuteue utendaji wa pamoja:

jsxfunction App() {
  const [obj, setObj] = useState(initObj);
  
  return <div>
    <input value={obj.prop1} onChange={event => handleChange('prop1', event)} />
    <input value={obj.prop2} onChange={event => handleChange('prop2', event)} />
    <input value={obj.prop3} onChange={event => handleChange('prop3', event)} />
    
    <br />
    {obj.prop1}-{obj.prop2}-{obj.prop3}
  </div>;
}

Kama unavyoona, utendaji handleChange hupokea jina la sifa inayofanana ya kitu kama parameta ya kwanza.

Wacha tuandike utekelezaji wa utendaji wetu:

jsxfunction handleChange(prop, event) {
  const copy = Object.assign({}, obj);
  copy[prop] = event.target.value;
  setObj(copy);
}

Utekelezaji huu unafanya kazi, lakini unaweza kurahisishwa, kwa kutumia majina yanayoweza kuhesabiwa ya sifa za kitu:

jsxfunction handleChange(prop, event) {
  setObj({...obj, ...{[prop]: event.target.value}});
}

Wacha tuchanganye msimbo wote pamoja:

jsxfunction App() {
  const [obj, setObj] = useState(initObj);
  
  function handleChange(prop, event) {
    setObj({...obj, ...{[prop]: event.target.value}});
  }
  
  return <div>
    <input value={obj.prop1} onChange={event => handleChange('prop1', event)} />
    <input value={obj.prop2} onChange={event => handleChange('prop2', event)} />
    <input value={obj.prop3} onChange={event => handleChange('prop3', event)} />
    
    <br />
    {obj.prop1}-{obj.prop2}-{obj.prop3}
  </div>;
}

jsxconst initDate = {
  year:  2025,
  month: 12,
  day:   31,
}