如何在 React 的事件处理函数中访问 DOM 元素的属性和值？

Question

My render function is

<input type="text" id="search" data-id={form.id} value={form.name} placeholder= "Search..." name="id" onKeyUp={this.keyUpFn}"/>

and my keyUpFn function is

keyUpFn(e){
    var textInput = document.getElementById('search');
    value1 = textInput.getAttribute('data-id')
    value2 = e.getAttribute('data-id')
    console.log(value1 )
    console.log(value2 )
}

Both console value gives error as getAttribute is not defined. How can I solve this in React?

Answer 1

You can get the data from the Event target object. This is how the code would look

keyUpFn(e){
    console.log(e.target.getAttribute('data-id'));
    console.log(e.target.value);
}

Answer 2

You can actually get the data requested from the event (e) in your function by accessing

event.currentTarget.dataset.paramater;

keyUpFn(e) {
  e.currentTarget.dataset.id
}

Answer 3

You can use getElementsByClassName (or id, name etc.), querySelectorAll, focus. First two returns an array of all valid elements.