如何从Angular中的对象中获取键值对。

huangapple
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英文:

How to get an key value pair from an object in angular

问题

  1. sample array:
  3. const obj = {
  4.   "29": "DTE Queue",
  5.   "30": "Services Reporting Sales",
  6.   "31": "Services Reporting Ops",
  7.   "41": "UPLOAD",
  8.   "55": "Support Report"
  9. };
  11. I'm getting input from user as 'ser'. Then output should be { "30": "Services Reporting Sales", "31": "Services Reporting Ops"}. But the output I'm getting is {"30": "Services Reporting Sales"}.
  13. **Method 1:**
  15. getKeyByValue(obj: object, value) {
  16.   const matchedEntry = Object.entries(obj).find(entry =>
  17.   entry[1].toLowerCase().match(value.toLowerCase()));
  18.   return matchedEntry && (<any>Object).fromEntries([matchedEntry])
  19. }
  21. **Method 2:**
  23. getKeyByValue(obj: Object, value) {
  24.   try {
  25.     return (<any>Object).fromEntries([
  26.       Object.entries(obj).find(([key, val]) =>
  27.         val.toLowerCase().startsWith(value.toLowerCase())
  28.       ),
  29.     ]);
  30.   } catch (err) {
  31.     console.log("Object not found");
  32.     return {};
  33.   }
  34. }
英文:

sample array:

  1.   const obj = {
  2.     &quot;29&quot;: &quot;DTE Queue&quot;,
  3.     &quot;30&quot;: &quot;Services Reporting Sales&quot;,
  4.     &quot;31&quot;: &quot;Services Reporting Ops&quot;,
  5.     &quot;41&quot;: &quot;UPLOAD&quot;,
  6.     &quot;55&quot;: &quot;Support Report&quot;
  7.   };

I'm getting input from user as 'ser'. Then output should be { "30": "Services Reporting Sales", "31": "Services Reporting Ops"}.But the output I'm getting is {"30": "Services Reporting Sales"}.

Method 1:

  1.  getKeyByValue(obj:object, value) {
  2.   const matchedEntry = Object.entries(obj).find(entry =&gt; 
  3.   entry[1].toLowerCase().match(value.toLowerCase()));
  4.   return matchedEntry &amp;&amp;(&lt;any&gt;Object).fromEntries([matchedEntry])
  5. }

Method2:

  1. getKeyByValue(obj: Object, value) {
  2.     try {
  3.       return (&lt;any&gt;Object).fromEntries([
  4.         Object.entries(obj).find(([key, val]) =&gt;
  5.           val.toLowerCase().startsWith(value.toLowerCase())
  6.         ),
  7.       ]);
  8.     } catch (err) {
  9.       console.log(&quot;Object not found&quot;);
  10.       return {};
  11.     }
  12.   }

答案1

得分: 1

你正在使用find。find返回第一个搜索结果。如果你想要多个结果，可以使用filter。

  1. const obj = {"29": "DTE Queue", "30": "Services Reporting Sales", "31": "Services Reporting Ops", "41": "UPLOAD", "55": "Support Report"};
  3. function getObjectByValue(object, value) {
  4.     return Object.fromEntries(Object.entries(object).filter(([key, val]) => val.toLowerCase().includes(value.toLowerCase())));
  5. }
  7. console.log(getObjectByValue(obj, 'ser'));
  8. console.log(getObjectByValue(obj, 'sup2'));
英文:

You're using find. find returns the first search result. If you want multiple results, you can use filter.

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

  1. const obj = {&quot;29&quot;: &quot;DTE Queue&quot;, &quot;30&quot;: &quot;Services Reporting Sales&quot;, &quot;31&quot;: &quot;Services Reporting Ops&quot;, &quot;41&quot;: &quot;UPLOAD&quot;, &quot;55&quot;: &quot;Support Report&quot;};
  3. function getObjectByValue(object, value) {
  4.     return Object.fromEntries(Object.entries(object).filter(([key, val]) =&gt; val.toLowerCase().includes(value.toLowerCase())));
  5. }
  7. console.log(getObjectByValue(obj, &#39;ser&#39;));
  8. console.log(getObjectByValue(obj, &#39;sup2&#39;));

<!-- end snippet -->

huangapple
  • 本文由 发表于 2023年2月6日 15:53:19
  • 转载请务必保留本文链接：https://go.coder-hub.com/75358611.html
  • arrays
  • javascript
  • typescript
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