React
- 5 ответов
- 0 вопросов
4
Вклад в тег
You may call setState() immediately in componentDidMount(). It will trigger an extra rendering, but it will happen before the browser updates the screen. This guarantees that even though the render() will be called twice in this case, the user won’t see the intermediate state.
<!-- The text field -->
<input type="text" value="Hello World" id="myInput">
<!-- The button used to copy the text -->
<button onclick="myFunction()">Copy text</button>function myFunction() {
/* Get the text field */
var copyText = document.getElementById("myInput");
/* Select the text field */
copyText.select();
copyText.setSelectionRange(0, 99999); /*For mobile devices*/
/* Copy the text inside the text field */
document.execCommand("copy");
/* Alert the copied text */
alert("Copied the text: " + copyText.value);
}