{"id":4736,"date":"2023-01-04T18:00:09","date_gmt":"2023-01-04T10:00:09","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4736"},"modified":"2023-01-04T18:00:09","modified_gmt":"2023-01-04T10:00:09","slug":"%e8%a7%a3%e6%b1%bareact-js%e4%b8%ad%e3%80%8c%e6%8e%a7%e5%88%b6select%e5%85%83%e7%b4%a0%e8%ae%8a%e7%82%ba%e4%b8%8d%e5%8f%97%e6%8e%a7%e5%88%b6%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%8c%e6%8e%a7%e5%88%b6select%e5%85%83%e7%b4%a0%e8%ae%8a%e7%82%ba%e4%b8%8d%e5%8f%97%e6%8e%a7%e5%88%b6%e3%80%8d%e7%9a%84%e9%8c%af%e8%aa%a4\/","title":{"rendered":"\u89e3\u6c7aReact.js\u4e2d\u300c\u63a7\u5236Select\u5143\u7d20\u8b8a\u70ba\u4e0d\u53d7\u63a7\u5236\u300d\u7684\u932f\u8aa4"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"React.js, Error, Controlled Select Element, Uncontrolled\"><\/p>\n<h1>\u89e3\u6c7a React.js &#8220;Error: A component is changing a controlled select element to be uncontrolled&#8221; \u5e38\u898b\u932f\u8aa4<\/h1>\n<p>React.js \u662f\u4e00\u500b\u7528\u65bc\u69cb\u5efa\u7528\u6236\u7aef\u61c9\u7528\u7a0b\u5e8f\u7684 JavaScript \u6846\u67b6\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5feb\u901f\u69cb\u5efa\u51fa\u9ad8\u54c1\u8cea\u7684\u61c9\u7528\u7a0b\u5e8f\u3002\u7136\u800c\uff0c\u5728\u958b\u767c React.js \u61c9\u7528\u7a0b\u5e8f\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u4e00\u4e9b\u5e38\u898b\u7684\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f &#8220;Error: A component is changing a controlled select element to be uncontrolled&#8221;\u3002<\/p>\n<p>\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u662f\uff0c\u7576\u4e00\u500b React \u7d44\u4ef6\u6b63\u5728\u66f4\u6539\u4e00\u500b\u53d7\u63a7\u7684 select \u5143\u7d20\u6642\uff0c\u5b83\u5c31\u6703\u8b8a\u6210\u4e00\u500b\u4e0d\u53d7\u63a7\u7684\u5143\u7d20\u3002\u9019\u662f\u56e0\u70ba React \u5c0d\u65bc\u53d7\u63a7\u5143\u7d20\u7684\u66f4\u6539\u6709\u4e00\u4e9b\u9650\u5236\uff0c\u5b83\u5011\u5fc5\u9808\u5728 React \u7684\u72c0\u614b\u4e2d\u88ab\u63a7\u5236\u3002<\/p>\n<h2>\u89e3\u6c7a\u8a72\u932f\u8aa4\u7684\u65b9\u6cd5<\/h2>\n<p>\u8981\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\uff0c\u958b\u767c\u8005\u9700\u8981\u78ba\u4fdd React \u7d44\u4ef6\u4e2d\u7684 select \u5143\u7d20\u662f\u53d7\u63a7\u7684\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5c07 select \u5143\u7d20\u7684 value \u5c6c\u6027\u8a2d\u7f6e\u70ba React \u72c0\u614b\u4e2d\u7684\u503c\u4f86\u5be6\u73fe\u3002<\/p>\n<pre class=\"brush: javascript\">\n\/\/ \u4f8b\u5982\uff0c\u5982\u679c React \u72c0\u614b\u4e2d\u7684\u503c\u70ba 'foo'\uff0c\u5247\u53ef\u4ee5\u5c07 select \u5143\u7d20\u7684 value \u5c6c\u6027\u8a2d\u7f6e\u70ba 'foo'\uff1a\n\n<select value={this.state.value}>\n  <option value=\"foo\">Foo<\/option>\n  <option value=\"bar\">Bar<\/option>\n<\/select>\n<\/pre>\n<p>\u53e6\u5916\uff0c\u958b\u767c\u8005\u9084\u9700\u8981\u78ba\u4fdd\u5728 select \u5143\u7d20\u4e0a\u8a2d\u7f6e onChange \u4e8b\u4ef6\uff0c\u4ee5\u4fbf\u5728\u7528\u6236\u9078\u64c7\u4e0d\u540c\u7684\u9078\u9805\u6642\u66f4\u65b0 React \u72c0\u614b\u3002<\/p>\n<pre class=\"brush: javascript\">\n\/\/ \u4f8b\u5982\uff0c\u53ef\u4ee5\u5c07 onChange \u4e8b\u4ef6\u8a2d\u7f6e\u70ba\u66f4\u65b0 React \u72c0\u614b\u7684\u51fd\u6578\uff1a\n\n<select value={this.state.value} onChange={this.handleChange}>\n  <option value=\"foo\">Foo<\/option>\n  <option value=\"bar\">Bar<\/option>\n<\/select>\n\nhandleChange(event) {\n  this.setState({value: event.target.value});\n}\n<\/pre>\n<p>\u901a\u904e\u5c07 select \u5143\u7d20\u8a2d\u7f6e\u70ba\u53d7\u63a7\u5143\u7d20\uff0c\u4e26\u5728\u7528\u6236\u9078\u64c7\u4e0d\u540c\u7684\u9078\u9805\u6642\u66f4\u65b0 React \u72c0\u614b\uff0c\u958b\u767c\u8005\u5c31\u53ef\u4ee5\u89e3\u6c7a &#8220;Error: A component is changing a controlled select element to be uncontrolled&#8221; \u9019\u500b\u5e38\u898b\u932f\u8aa4\u3002<\/p>\n<p><!--more--><\/p>\n<h2>\u7e3d\u7d50<\/h2>\n<p>React.js \u662f\u4e00\u500b\u7528\u65bc\u69cb\u5efa\u7528\u6236\u7aef\u61c9\u7528\u7a0b\u5e8f\u7684 JavaScript \u6846\u67b6\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5feb\u901f\u69cb\u5efa\u51fa\u9ad8\u54c1\u8cea\u7684\u61c9\u7528\u7a0b\u5e8f\u3002\u7136\u800c\uff0c\u5728\u958b\u767c React.js \u61c9\u7528\u7a0b\u5e8f\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u4e00\u4e9b\u5e38\u898b\u7684\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f &#8220;Error: A component is changing a controlled select element to be uncontrolled&#8221;\u3002\u8981\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\uff0c\u958b\u767c\u8005\u9700\u8981\u78ba\u4fdd React \u7d44\u4ef6\u4e2d\u7684 select \u5143\u7d20\u662f\u53d7\u63a7\u7684\uff0c\u4e26\u5728\u7528\u6236\u9078\u64c7\u4e0d\u540c\u7684\u9078\u9805\u6642\u66f4\u65b0 React \u72c0\u614b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u89e3\u6c7aReact.js\u4e2d\u300c\u63a7\u5236Select\u5143\u7d20\u8b8a\u70ba\u4e0d\u53d7\u63a7\u5236\u300d\u7684\u932f\u8aa4\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u6709\u7528\u7684\u6280\u5de7\uff0c\u4ee5\u4fbf\u958b\u767c\u8005\u80fd\u5920\u66f4\u6709\u6548\u5730\u4f7f\u7528React.js\u4f86\u69cb\u5efa\u4ed6\u5011\u7684\u61c9\u7528\u7a0b\u5e8f\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-4736","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\/pcFK27-1eo","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4736","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=4736"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4736\/revisions"}],"predecessor-version":[{"id":4737,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/4736\/revisions\/4737"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=4736"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=4736"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=4736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}