Javascript 如何在羽毛笔中设置字符长度
如何在react quill中设置字符长度。在文档中,getLength()将在编辑器中返回字符的长度 但我不知道如何实施它 我的JSXJavascript 如何在羽毛笔中设置字符长度,javascript,reactjs,quill,react-quill,Javascript,Reactjs,Quill,React Quill,如何在react quill中设置字符长度。在文档中,getLength()将在编辑器中返回字符的长度 但我不知道如何实施它 我的JSX //OnChange处理程序 handleChange=(值)=>{ this.setState({text:value}) } //最大值检查器 checkCharacterCount=(事件)=>{ if(this.getLength().length>280&&event.key!=='Backspace'){ event.preventDefaul
//OnChange处理程序
handleChange=(值)=>{
this.setState({text:value})
}
//最大值检查器
checkCharacterCount=(事件)=>{
if(this.getLength().length>280&&event.key!=='Backspace'){
event.preventDefault();
}
}
以下各项应能起作用:
class Editor extends React.Component {
constructor (props) {
super(props)
this.handleChange = this.handleChange.bind(this)
this.quillRef = null; // Quill instance
this.reactQuillRef = null;
this.state = {editorHtml : ''};
}
componentDidMount() {
this.attachQuillRefs()
}
componentDidUpdate() {
this.attachQuillRefs()
}
attachQuillRefs = () => {
if (typeof this.reactQuillRef.getEditor !== 'function') return;
this.quillRef = this.reactQuillRef.getEditor();
}
handleChange (html) {
var limit = 10;
var quill = this.quillRef;
quill.on('text-change', function (delta, old, source) {
if (quill.getLength() > limit) {
quill.deleteText(limit, quill.getLength());
}
});
this.setState({ editorHtml: html });
}
render () {
return <ReactQuill
ref={(el) => { this.reactQuillRef = el }}
theme="snow"
onChange={this.handleChange}
value={this.state.editorHtml}
/>
}
}
类编辑器扩展React.Component{
建造师(道具){
超级(道具)
this.handleChange=this.handleChange.bind(this)
this.quillRef=null;//Quill实例
this.reactQuillRef=null;
this.state={editorHtml:''};
}
componentDidMount(){
这个。附件quillrefs()
}
componentDidUpdate(){
这个。附件quillrefs()
}
附件引用=()=>{
if(typeof this.reactQuillRef.getEditor!=“function”)返回;
this.quillRef=this.reactQuillRef.getEditor();
}
handleChange(html){
var限值=10;
var quill=this.quillRef;
quill.on('text-change',函数(delta、old、source){
if(quill.getLength()>限制){
quill.deleteText(limit,quill.getLength());
}
});
this.setState({editorHtml:html});
}
渲染(){
返回{this.reactQuillRef=el}}
主题=“雪”
onChange={this.handleChange}
值={this.state.editorHtml}
/>
}
}
我认为您缺少对ReactQuill
组件本身的引用。没有该引用,您将无法访问其任何非特权方法(例如getLength()
)。您可以通过handleChange
方法(即onChange prop上的第四个参数)获取副本,但我建议您只需向ReactQuill
组件添加一个单独的ref prop并使用它。下面是一个重新编写为功能组件的示例(…自2020年以来):
导出常量编辑器=()=>{
const[value,setValue]=React.useState(null);
const reactQuillRef=React.useRef();
常量handleChange=(值)=>setValue(值);
常量checkCharacterCount=(事件)=>{
const unprivilegeditor=reactQuillRef.current.unprivilegeditor;
if(unprivilegedEditor.getLength()>280&&event.key!=='Backspace')
event.preventDefault();
};
返回(
)
}
export const Editor = () => {
const [value, setValue] = React.useState(null);
const reactQuillRef = React.useRef();
const handleChange = (value) => setValue(value);
const checkCharacterCount = (event) => {
const unprivilegedEditor = reactQuillRef.current.unprivilegedEditor;
if (unprivilegedEditor.getLength() > 280 && event.key !== 'Backspace')
event.preventDefault();
};
return (
<ReactQuill theme='snow'
onKeyDown={checkCharacterCount}
ref={reactQuillRef}
value={this.state.text}
onChange={this.handleChange}
modules={modules}
formats={formats} />
)
}