{"id":4738,"date":"2023-01-04T18:01:17","date_gmt":"2023-01-04T10:01:17","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4738"},"modified":"2023-01-04T18:01:17","modified_gmt":"2023-01-04T10:01:17","slug":"%e8%a7%a3%e6%b1%bareact-js%e4%b8%ad%e3%80%8cerroracomponentischanginganuncontrolledselectelementtobecontrolled%e3%80%8d%e7%9a%84%e9%8c%af%e8%aa%a4","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/react-js\/%e8%a7%a3%e6%b1%bareact-js%e4%b8%ad%e3%80%8cerroracomponentischanginganuncontrolledselectelementtobecontrolled%e3%80%8d%e7%9a%84%e9%8c%af%e8%aa%a4\/","title":{"rendered":"\u89e3\u6c7aReact.js\u4e2d\u300cError:Acomponentischanginganuncontrolledselectelementtobecontrolled\u300d\u7684\u932f\u8aa4"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"React.js, Error, uncontrolled select element, controlled\"><\/p>\n<h1>\u89e3\u6c7a React.js &#8220;Error: A component is changing an uncontrolled select element to be controlled&#8221; \u932f\u8aa4<\/h1>\n<p>React.js \u662f\u4e00\u500b\u7528\u65bc\u69cb\u5efa\u7528\u6236\u7aef\u61c9\u7528\u7a0b\u5e8f\u7684 JavaScript \u5eab\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u8f15\u9b06\u5730\u69cb\u5efa\u9ad8\u6027\u80fd\u7684\u7db2\u9801\u61c9\u7528\u7a0b\u5e8f\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528 React.js \u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\uff1a\u201cError: A component is changing an uncontrolled select element to be controlled\u201d\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5982\u4f55\u89e3\u6c7a\u6b64\u932f\u8aa4\u3002<\/p>\n<h2>\u4ec0\u9ebc\u662f uncontrolled select element\uff1f<\/h2>\n<p>Uncontrolled select element \u662f\u4e00\u7a2e HTML \u5143\u7d20\uff0c\u5b83\u53ef\u4ee5\u8b93\u7528\u6236\u9078\u64c7\u4e00\u500b\u6216\u591a\u500b\u9078\u9805\u3002\u5b83\u7684\u503c\u662f\u7531\u7528\u6236\u81ea\u884c\u6c7a\u5b9a\u7684\uff0c\u800c\u4e0d\u662f\u7531 React.js \u63a7\u5236\u3002<\/p>\n<h2>\u4ec0\u9ebc\u662f controlled select element\uff1f<\/h2>\n<p>Controlled select element \u662f\u4e00\u7a2e HTML \u5143\u7d20\uff0c\u5b83\u7684\u503c\u662f\u7531 React.js \u63a7\u5236\u7684\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u597d\u5730\u63a7\u5236\u7528\u6236\u7684\u8f38\u5165\uff0c\u4e26\u63d0\u4f9b\u66f4\u597d\u7684\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<h2>\u70ba\u4ec0\u9ebc\u6703\u51fa\u73fe &#8220;Error: A component is changing an uncontrolled select element to be controlled&#8221; \u932f\u8aa4\uff1f<\/h2>\n<p>\u9019\u500b\u932f\u8aa4\u6703\u51fa\u73fe\uff0c\u662f\u56e0\u70ba React.js \u5617\u8a66\u5c07 uncontrolled select element \u8f49\u63db\u70ba controlled select element\u3002\u9019\u662f\u56e0\u70ba React.js \u5c0d\u65bc uncontrolled select element \u7684\u884c\u70ba\u662f\u4e0d\u53ef\u9810\u6e2c\u7684\uff0c\u6240\u4ee5\u5b83\u5617\u8a66\u5c07\u5b83\u8f49\u63db\u70ba controlled select element \u4ee5\u78ba\u4fdd\u5b83\u7684\u884c\u70ba\u662f\u53ef\u9810\u6e2c\u7684\u3002<\/p>\n<h2>\u5982\u4f55\u89e3\u6c7a &#8220;Error: A component is changing an uncontrolled select element to be controlled&#8221; \u932f\u8aa4\uff1f<\/h2>\n<p>\u89e3\u6c7a\u6b64\u932f\u8aa4\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u5c07 uncontrolled select element \u66ff\u63db\u70ba controlled select element\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4f7f\u7528 React.js \u7684 <code>&lt;select&gt;<\/code> \u5143\u7d20\u4f86\u5be6\u73fe\uff0c\u4e26\u5c07 <code>value<\/code> \u5c6c\u6027\u8a2d\u7f6e\u70ba React.js \u7684 state \u4f86\u63a7\u5236\u3002<\/p>\n<pre class=\"brush: javascript\">\nclass MyComponent extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      value: '',\n    };\n  }\n\n  handleChange = (event) => {\n    this.setState({ value: event.target.value });\n  };\n\n  render() {\n    return (\n      <select value={this.state.value} onChange={this.handleChange}>\n        <option value=\"apple\">Apple<\/option>\n        <option value=\"orange\">Orange<\/option>\n        <option value=\"banana\">Banana<\/option>\n      <\/select>\n    );\n  }\n}\n<\/pre>\n<p>\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 React.js \u7684 <code>&lt;select&gt;<\/code> \u5143\u7d20\uff0c\u4e26\u5c07 <code>value<\/code> \u5c6c\u6027\u8a2d\u7f6e\u70ba React.js \u7684 state \u4f86\u63a7\u5236\u3002\u9019\u6a23\u5c31\u53ef\u4ee5\u89e3\u6c7a &#8220;Error: A component is changing an uncontrolled select element to be controlled&#8221; \u932f\u8aa4\u3002<\/p>\n<p><!--more--><\/p>\n<h2>\u7e3d\u7d50<\/h2>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u8a73\u7d30\u4ecb\u7d39\u4e86\u5982\u4f55\u89e3\u6c7a React.js &#8220;Error: A component is changing an uncontrolled select element to be controlled&#8221; \u932f\u8aa4\u3002\u6211\u5011\u5efa\u8b70\u958b\u767c\u8005\u5c07 uncontrolled select element \u66ff\u63db\u70ba controlled select element\uff0c\u4e26\u4f7f\u7528 React.js \u7684 <code>&lt;select&gt;<\/code> \u5143\u7d20\u4f86\u63a7\u5236\u5b83\u7684\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u89e3\u6c7aReact.js\u4e2d\u300cError:Acomponentischanginganuncontrolledselectelementtobecontrolled\u300d\u7684\u932f\u8aa4\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u6709\u7528\u7684\u6280\u5de7\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u89e3\u6c7a\u6b64\u985e\u554f\u984c\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[184,183],"tags":[182,181],"class_list":["post-4738","post","type-post","status-publish","format-standard","hentry","category-react","category-react-js","tag-react","tag-react-js"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-1eq","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4738","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=4738"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4738\/revisions"}],"predecessor-version":[{"id":4739,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4738\/revisions\/4739"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4738"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4738"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4738"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}