{"id":1429,"date":"2023-10-06T00:00:03","date_gmt":"2023-10-05T22:00:03","guid":{"rendered":"https:\/\/epicmarketing.co.il\/notebook\/?p=1429"},"modified":"2023-10-06T00:01:43","modified_gmt":"2023-10-05T22:01:43","slug":"declarative-programming-filter-posts","status":"publish","type":"post","link":"https:\/\/epicmarketing.co.il\/notebook\/declarative-programming-filter-posts\/","title":{"rendered":"Declarative Programming &#8211; Filter Posts"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u05d1\u05e9\u05dc\u05d1 \u05d4\u05d1\u05d0 \u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05dc\u05e8\u05d0\u05d5\u05ea \u05d0\u05d9\u05da \u05d0\u05e4\u05e9\u05e8 \u05dc\u05d1\u05e6\u05e2 filter \u05e2\u05dc \u05d4\u05d8\u05d1\u05dc\u05d4. \u05e0\u05e0\u05d9\u05d7 \u05e9\u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05dc\u05ea\u05ea \u05dc\u05de\u05e9\u05ea\u05de\u05e9 \u05dc\u05d1\u05d7\u05d5\u05e8 \u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05dc\u05e4\u05d9 \u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4. \u05d1\u05ea\u05d5\u05e8 \u05d4\u05ea\u05d7\u05dc\u05d4 \u05e0\u05d1\u05d7\u05e8 \u05d0\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4 \u05e2\u05dd id=1.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u05e9\u05d9\u05de\u05d5\u05e9 \u05d1-filter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u05e7\u05d5\u05d1\u05e5 declarative-posts.component.ts<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; highlight: [2,5,6,7,8,9]; title: ; notranslate\" title=\"\">\nexport class DeclarativePostsComponent {\n  selectedCategoryId = &#039;1&#039;;\n  posts$ = this.postService.postsWithCategory$;\n\n  filteredPosts$ = this.posts$.pipe(\n    map(posts =&gt; {\n      return posts.filter(\n        (post) =&gt; post.categoryId == this.selectedCategoryId\n    )\n  }));\n\n  constructor(private postService: DeclarativePostsService){}\n}\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05d5\u05d1\u05ea\u05e6\u05d5\u05d2\u05d4 \u05e0\u05e7\u05e8\u05d0 \u05dc-filteredPosts. \u05e0\u05e7\u05d1\u05dc \u05d0\u05ea \u05d4\u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05e9\u05e9\u05d9\u05d9\u05db\u05d9\u05dd \u05dc-id 1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u05d4\u05e9\u05dc\u05d1 \u05d4\u05d1\u05d0 \u05d4\u05d5\u05d0 \u05dc\u05ea\u05ea \u05dc\u05de\u05e9\u05ea\u05de\u05e9 \u05dc\u05d1\u05d7\u05d5\u05e8 \u05d0\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4 \u05e9\u05d4\u05d5\u05d0 \u05e8\u05d5\u05e6\u05d4 \u05d5\u05dc\u05e2\u05d3\u05db\u05df \u05d0\u05ea \u05d4\u05e8\u05e9\u05d9\u05de\u05d4 \u05d1\u05d4\u05ea\u05d0\u05dd.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u05db\u05d3\u05d9 \u05dc\u05e7\u05d1\u05dc \u05d0\u05ea \u05e8\u05e9\u05d9\u05de\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d5\u05ea \u05e0\u05d6\u05e8\u05d9\u05e7 \u05d0\u05ea \u05e9\u05d9\u05e8\u05d5\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d5\u05ea.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nconstructor(private postService: DeclarativePostsService,\n  private categoryService: DeclarativeCategoriesService){}\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05e0\u05d5\u05e1\u05d9\u05e3 \u05de\u05e9\u05ea\u05e0\u05d4 \u05e9\u05d9\u05e7\u05d1\u05dc \u05d0\u05ea \u05e8\u05e9\u05d9\u05de\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d5\u05ea.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\ncategories$ = this.categoryService.categories$;\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05d5\u05e0\u05e6\u05d9\u05d2 \u05d0\u05ea \u05d4\u05e8\u05e9\u05d9\u05de\u05d4 \u05e2\u05dc \u05d4\u05de\u05e1\u05da.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u05e7\u05d5\u05d1\u05e5 declarative-posts.component.html<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: xml; title: ; notranslate\" title=\"\">\n&lt;div class=&quot;row&quot;&gt;\n  &lt;div class=&quot;col-md-4 py-3&quot;&gt;\n    &lt;select class=&quot;form-select&quot;&gt;\n      &lt;option value=&quot;&quot;&gt;Select Category&lt;\/option&gt;\n      &lt;option &#x5B;value]=&quot;category.id&quot;\n      *ngFor=&quot;let category of categories$ | async&quot;&gt;\n      {{ category.title }}\n    &lt;\/option&gt;\n    &lt;\/select&gt;\n  &lt;\/div&gt;\n&lt;\/div&gt;\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05e2\u05db\u05e9\u05d9\u05d5 \u05e6\u05e8\u05d9\u05da \u05dc\u05e1\u05e0\u05df \u05d0\u05ea \u05d4\u05e8\u05e9\u05d9\u05de\u05d4 \u05dc\u05e4\u05d9 \u05d4\u05d1\u05d7\u05d9\u05e8\u05d4 \u05e9\u05dc \u05d4\u05de\u05e9\u05ea\u05de\u05e9.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"349\" src=\"https:\/\/epicmarketing.co.il\/notebook\/wp-content\/uploads\/2023\/10\/declarative6-1024x349.png\" alt=\"\" class=\"wp-image-1431\" srcset=\"https:\/\/epicmarketing.co.il\/notebook\/wp-content\/uploads\/2023\/10\/declarative6-1024x349.png 1024w, https:\/\/epicmarketing.co.il\/notebook\/wp-content\/uploads\/2023\/10\/declarative6-300x102.png 300w, https:\/\/epicmarketing.co.il\/notebook\/wp-content\/uploads\/2023\/10\/declarative6-768x262.png 768w, https:\/\/epicmarketing.co.il\/notebook\/wp-content\/uploads\/2023\/10\/declarative6.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05d1\u05e9\u05dc\u05d1 \u05e8\u05d0\u05e9\u05d5\u05df \u05e0\u05d3\u05d0\u05d2 \u05dc\u05d6\u05d4 \u05e9\u05d0\u05dd \u05d0\u05d9\u05df \u05d1\u05d7\u05d9\u05e8\u05d4, \u05e0\u05e6\u05d9\u05d2 \u05d0\u05ea \u05db\u05dc \u05d4\u05e4\u05d5\u05e1\u05d8\u05d9\u05dd.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u05e7\u05d5\u05d1\u05e5 declarative-posts.component.ts<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nfilteredPosts$ = this.posts$.pipe(\n    map(posts =&gt; {\n      return posts.filter(\n        (post) =&gt; this.selectedCategoryId\n          ? post.categoryId == this.selectedCategoryId\n          : true\n    )\n}));\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05e0\u05d5\u05e1\u05d9\u05e3 \u05e4\u05d5\u05e0\u05e7\u05e6\u05d9\u05d4 \u05dc\u05d8\u05d9\u05e4\u05d5\u05dc \u05d1\u05d1\u05d7\u05d9\u05e8\u05d4 \u05e9\u05dc \u05d4\u05de\u05e9\u05ea\u05de\u05e9.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nonCategoryChange(event: Event){\n    let selectedCategoryId = (event.target as HTMLSelectElement).value;\n    this.selectedCategoryId = selectedCategoryId;\n}\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05d5\u05e0\u05e7\u05d1\u05dc \u05d0\u05ea \u05d4\u05e2\u05e8\u05da \u05de\u05ea\u05d5\u05da \u05d0\u05dc\u05de\u05e0\u05d8 \u05d4-html.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u05e7\u05d5\u05d1\u05e5 declarative-posts.component.html<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: xml; highlight: [3]; title: ; notranslate\" title=\"\">\n&lt;div class=&quot;row&quot;&gt;\n      &lt;div class=&quot;col-md-4 py-3&quot;&gt;\n        &lt;select class=&quot;form-select&quot; (change)=&quot;onCategoryChange($event)&quot;&gt;\n          &lt;option value=&quot;&quot;&gt;Select Category&lt;\/option&gt;\n          &lt;option &#x5B;value]=&quot;category.id&quot;\n          *ngFor=&quot;let category of categories$ | async&quot;&gt;\n          {{ category.title }}\n        &lt;\/option&gt;\n        &lt;\/select&gt;\n      &lt;\/div&gt;\n&lt;\/div&gt;\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05e0\u05e9\u05de\u05d5\u05e8 \u05d0\u05ea \u05d4\u05e7\u05d5\u05d3, \u05d5\u05e0\u05e8\u05d0\u05d4 \u05e9\u05d4\u05d5\u05d0 \u05dc\u05d0 \u05de\u05d1\u05e6\u05e2 \u05d0\u05ea \u05d4\u05e4\u05e2\u05d5\u05dc\u05d4 \u05e9\u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd. \u05d4\u05e9\u05d9\u05e0\u05d5\u05d9 \u05de\u05ea\u05d1\u05e6\u05e2 \u05d1\u05de\u05e9\u05ea\u05e0\u05d4 selectedCategoryId \u05d5\u05d0\u05e0\u05d7\u05e0\u05d5 \u05dc\u05d0 \u05e2\u05d5\u05e7\u05d1\u05d9\u05dd \u05d0\u05d7\u05e8\u05d9 \u05d4\u05e9\u05d9\u05e0\u05d5\u05d9\u05d9\u05dd \u05e9\u05dc\u05d5. \u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05dc\u05d4\u05e4\u05d5\u05da \u05d0\u05d5\u05ea\u05d5 \u05dc-observable \u05db\u05d3\u05d9 \u05dc\u05e2\u05e7\u05d5\u05d1 \u05d0\u05d7\u05e8\u05d9 \u05d4\u05e9\u05d9\u05e0\u05d5\u05d9\u05d9\u05dd \u05e9\u05dc\u05d5.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Data Stream vs Action Stream<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u05d0\u05e0\u05d7\u05e0\u05d5 \u05e6\u05e8\u05d9\u05db\u05d9\u05dd \u05dc\u05e4\u05dc\u05d8\u05e8 \u05d0\u05ea \u05d4\u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05dc\u05e4\u05d9 \u05d1\u05d7\u05d9\u05e8\u05ea \u05d4\u05de\u05e9\u05ea\u05de\u05e9. \u05d0\u05e0\u05d7\u05e0\u05d5 \u05de\u05e7\u05d1\u05dc\u05d9\u05dd \u05d0\u05ea \u05d4\u05de\u05d9\u05d3\u05e2 \u05e2\u05dc \u05d4\u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05de\u05ea\u05d5\u05da \u05e4\u05e2\u05d5\u05dc\u05ea get. \u05d4\u05d5\u05d0 \u05e2\u05d5\u05d1\u05d3\u05ea \u05e4\u05e2\u05dd \u05d0\u05d7\u05ea, \u05de\u05d1\u05d9\u05d0\u05d4 \u05d0\u05ea \u05d4\u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05d5\u05de\u05e1\u05d9\u05d9\u05de\u05ea \u05d0\u05ea \u05d4\u05e4\u05e2\u05d5\u05dc\u05d4 \u05e9\u05dc\u05d4. \u05d0\u05e0\u05d7\u05e0\u05d5 \u05e6\u05e8\u05d9\u05db\u05d9\u05dd \u05dc\u05e7\u05e8\u05d5\u05d0 \u05dc\u05e4\u05d5\u05e0\u05e7\u05e6\u05d9\u05d4 \u05e9\u05d5\u05d1. \u05d6\u05d4 \u05e0\u05e7\u05e8\u05d0 Data Stream.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Action Stream \u05d9\u05d8\u05e8\u05d9\u05d2 \u05d0\u05ea \u05d4\u05de\u05d9\u05d3\u05e2 \u05d1\u05db\u05dc \u05e4\u05e2\u05dd \u05db\u05e9\u05ea\u05d4\u05d9\u05d4 \u05e4\u05e2\u05d5\u05dc\u05d4. \u05d1\u05de\u05e7\u05e8\u05d4 \u05e9\u05dc\u05e0\u05d5 \u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05e9\u05ea\u05d4\u05d9\u05d4 \u05ea\u05d2\u05d5\u05d1\u05d4 \u05d1\u05db\u05dc \u05e4\u05e2\u05dd \u05db\u05e9\u05d4\u05de\u05e9\u05ea\u05de\u05e9 \u05d1\u05d5\u05d7\u05e8 \u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4. \u05d4-Stream \u05d4\u05d6\u05d4 \u05ea\u05de\u05d9\u05d3 \u05de\u05e7\u05e9\u05d9\u05d1 \u05dc\u05e9\u05d9\u05e0\u05d5\u05d9\u05d9\u05dd. \u05d0\u05e0\u05d7\u05e0\u05d5 \u05d9\u05db\u05d5\u05dc\u05d9\u05dd \u05dc\u05d4\u05e9\u05ea\u05de\u05e9 \u05d1-CombineLatest \u05db\u05d3\u05d9 \u05dc\u05d4\u05de\u05e9\u05d9\u05da \u05d5\u05dc\u05d4\u05e7\u05e9\u05d9\u05d1 \u05dc\u05de\u05d9\u05d3\u05e2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u05d0\u05e0\u05d7\u05e0\u05d5 \u05e6\u05e8\u05d9\u05db\u05d9\u05dd \u05dc\u05d4\u05e4\u05d5\u05da \u05d0\u05ea \u05e4\u05e2\u05d5\u05dc\u05ea \u05d4\u05d1\u05d7\u05d9\u05e8\u05d4 \u05e9\u05dc \u05d4\u05de\u05e9\u05ea\u05de\u05e9 \u05dc-observable \u05e9\u05e0\u05d5\u05db\u05dc \u05dc\u05d4\u05e7\u05e9\u05d9\u05d1 \u05dc\u05d5.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">observable \u05d4\u05d5\u05d0 unicast, \u05db\u05dc subscriber \u05de\u05e7\u05d1\u05dc \u05de\u05d5\u05e4\u05e2 \u05de\u05e9\u05dc\u05d5. subject \u05d4\u05d5\u05d0 multicast, \u05d9\u05db\u05d5\u05dc\u05d9\u05dd \u05dc\u05d4\u05d9\u05d5\u05ea \u05dc\u05d9 \u05db\u05de\u05d4 \u05e0\u05e8\u05e9\u05de\u05d9\u05dd \u05dc\u05d0\u05d5\u05ea\u05d5 subject \u05e9\u05d9\u05d7\u05dc\u05e7\u05d5 \u05d0\u05ea \u05d4\u05de\u05d9\u05d3\u05e2 \u05d1\u05d9\u05e0\u05d9\u05d4\u05dd. \u05e0\u05e9\u05ea\u05de\u05e9 \u05d1-subject \u05db\u05d3\u05d9 \u05dc\u05e7\u05d1\u05dc \u05d0\u05ea \u05d4\u05d1\u05d7\u05d9\u05e8\u05d4 \u05e9\u05dc \u05d4\u05de\u05e9\u05ea\u05de\u05e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Create Action Stream using BehaviorSubject<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u05e0\u05d9\u05d9\u05e6\u05e8 \u05d0\u05ea \u05d4\u05de\u05e9\u05ea\u05e0\u05d4 \u05e9\u05d9\u05d7\u05d6\u05d9\u05e7 \u05d0\u05ea \u05e9\u05d9\u05e0\u05d5\u05d9 \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u05e7\u05d5\u05d1\u05e5 declarative-posts.component.ts<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nselectedCategorySubject = new Subject&lt;string&gt;();\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05d1\u05db\u05dc \u05e4\u05e2\u05dd \u05e9\u05d4\u05de\u05e9\u05ea\u05de\u05e9 \u05de\u05e9\u05e0\u05d4 \u05d0\u05ea \u05d4\u05de\u05d9\u05d3\u05e2, \u05d0\u05e0\u05d7\u05e0\u05d5 \u05e6\u05e8\u05d9\u05db\u05d9\u05dd \u05dc\u05d4\u05e2\u05d1\u05d9\u05e8 \u05d0\u05ea \u05d6\u05d4 \u05d3\u05e8\u05da \u05d4-subject.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; highlight: [3]; title: ; notranslate\" title=\"\">\nonCategoryChange(event: Event){\n    let selectedCategoryId = (event.target as HTMLSelectElement).value;\n    this.selectedCategorySubject.next(selectedCategoryId);\n}\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05e2\u05db\u05e9\u05d9\u05d5 \u05d0\u05e0\u05d7\u05e0\u05d5 \u05e6\u05e8\u05d9\u05db\u05d9\u05dd \u05de\u05d9\u05e9\u05d4\u05d5 \u05e9\u05d9\u05d0\u05d6\u05d9\u05df \u05dc\u05e9\u05d9\u05e0\u05d5\u05d9 \u05d4\u05d6\u05d4.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nselectedCategoryAction$ = this.selectedCategorySubject.asObservable();\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05e2\u05db\u05e9\u05d9\u05d5 \u05d1\u05db\u05dc \u05e4\u05e2\u05dd \u05e9\u05d9\u05d4\u05d9\u05d4 \u05e9\u05d9\u05e0\u05d5\u05d9 \u05d1-selectedCategorySubject \u05d9\u05d4\u05d9\u05d4 \u05d8\u05e8\u05d9\u05d2\u05e8 \u05dc-selectedCategoryAction$. \u05d9\u05e9 \u05dc\u05e0\u05d5 \u05d0\u05ea \u05d4\u05de\u05d9\u05d3\u05e2, \u05d5\u05d9\u05e9 \u05dc\u05e0\u05d5 \u05d0\u05ea \u05d4\u05e4\u05e2\u05d5\u05dc\u05d4. \u05e6\u05e8\u05d9\u05da \u05dc\u05d7\u05d1\u05e8 \u05d0\u05d5\u05ea\u05dd.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">combineLatest \u05de\u05e7\u05d1\u05dc \u05de\u05e2\u05e8\u05da \u05e9\u05dc observables.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\nfilteredPosts$ = combineLatest(&#x5B;this.posts$, this.selectedCategoryAction$]).\n    pipe(map((&#x5B;posts, selectedCategoryId]) =&gt; {\n      return posts.filter(\n        (post) =&gt; post.categoryId == selectedCategoryId\n      )\n  }));\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u05d4\u05d1\u05d7\u05d9\u05e8\u05d4 \u05e9\u05dc \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d5\u05ea \u05e2\u05d5\u05d1\u05d3\u05ea, \u05e8\u05e7 \u05d9\u05e9 \u05d1\u05e2\u05d9\u05d4 \u05db\u05e9\u05e0\u05db\u05e0\u05e1\u05d9\u05dd \u05d1\u05e4\u05e2\u05dd \u05d4\u05e8\u05d0\u05e9\u05d5\u05e0\u05d4, \u05d0\u05d9\u05df \u05dc\u05e0\u05d5 \u05db\u05dc\u05d5\u05dd \u05d5\u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05d0\u05ea \u05e8\u05e9\u05d9\u05de\u05ea \u05db\u05dc \u05d4\u05e4\u05d5\u05e1\u05d8\u05d9\u05dd. \u05d6\u05d4 \u05e7\u05d5\u05e8\u05d4 \u05db\u05d9 \u05d4-Subject \u05e7\u05d5\u05e4\u05e5 \u05e8\u05e7 \u05db\u05e9\u05d4\u05d9\u05ea\u05d4 \u05e4\u05e2\u05d5\u05dc\u05ea next. \u05db\u05d3\u05d9 \u05dc\u05d4\u05ea\u05d7\u05d9\u05dc \u05e2\u05dd \u05e2\u05e8\u05da \u05d1\u05e8\u05d9\u05e8\u05ea \u05de\u05d7\u05d3\u05dc \u05db\u05dc\u05e9\u05d4\u05d5, \u05e0\u05e9\u05ea\u05de\u05e9 \u05d1-BehaviorSubject \u05d1\u05de\u05e7\u05d5\u05dd \u05d1-Subject.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u05d4\u05e7\u05d5\u05d3 \u05d4\u05de\u05dc\u05d0:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u05e7\u05d5\u05d1\u05e5 declarative-posts.component.ts<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; highlight: [2,3,8,20]; title: ; notranslate\" title=\"\">\nexport class DeclarativePostsComponent {\n  selectedCategorySubject = new BehaviorSubject&lt;string&gt;(&#039;&#039;);\n  selectedCategoryAction$ = this.selectedCategorySubject.asObservable();\n\n  posts$ = this.postService.postsWithCategory$;\n  categories$ = this.categoryService.categories$;\n\n  filteredPosts$ = combineLatest(&#x5B;this.posts$, this.selectedCategoryAction$]).\n    pipe(map((&#x5B;posts, selectedCategoryId]) =&gt; {\n      return posts.filter(\n        (post) =&gt; selectedCategoryId ? post.categoryId == selectedCategoryId : true\n      )\n    }));\n\n  constructor(private postService: DeclarativePostsService,\n    private categoryService: DeclarativeCategoriesService){}\n\n  onCategoryChange(event: Event){\n    let selectedCategoryId = (event.target as HTMLSelectElement).value;\n    this.selectedCategorySubject.next(selectedCategoryId);\n  }\n}\n<\/pre><\/div>","protected":false},"excerpt":{"rendered":"<p>\u05d1\u05e9\u05dc\u05d1 \u05d4\u05d1\u05d0 \u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05dc\u05e8\u05d0\u05d5\u05ea \u05d0\u05d9\u05da \u05d0\u05e4\u05e9\u05e8 \u05dc\u05d1\u05e6\u05e2 filter \u05e2\u05dc \u05d4\u05d8\u05d1\u05dc\u05d4. \u05e0\u05e0\u05d9\u05d7 \u05e9\u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05dc\u05ea\u05ea \u05dc\u05de\u05e9\u05ea\u05de\u05e9 \u05dc\u05d1\u05d7\u05d5\u05e8 \u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05dc\u05e4\u05d9 \u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4. \u05d1\u05ea\u05d5\u05e8 \u05d4\u05ea\u05d7\u05dc\u05d4 \u05e0\u05d1\u05d7\u05e8 \u05d0\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4 \u05e2\u05dd id=1. \u05e9\u05d9\u05de\u05d5\u05e9 \u05d1-filter \u05e7\u05d5\u05d1\u05e5 declarative-posts.component.ts \u05d5\u05d1\u05ea\u05e6\u05d5\u05d2\u05d4 \u05e0\u05e7\u05e8\u05d0 \u05dc-filteredPosts. \u05e0\u05e7\u05d1\u05dc \u05d0\u05ea \u05d4\u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05e9\u05e9\u05d9\u05d9\u05db\u05d9\u05dd \u05dc-id 1. \u05d4\u05e9\u05dc\u05d1 \u05d4\u05d1\u05d0 \u05d4\u05d5\u05d0 \u05dc\u05ea\u05ea \u05dc\u05de\u05e9\u05ea\u05de\u05e9 \u05dc\u05d1\u05d7\u05d5\u05e8 \u05d0\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4 \u05e9\u05d4\u05d5\u05d0 \u05e8\u05d5\u05e6\u05d4 \u05d5\u05dc\u05e2\u05d3\u05db\u05df \u05d0\u05ea \u05d4\u05e8\u05e9\u05d9\u05de\u05d4 \u05d1\u05d4\u05ea\u05d0\u05dd. \u05db\u05d3\u05d9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[26],"tags":[],"class_list":["post-1429","post","type-post","status-publish","format-standard","hentry","category-rxjs","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Declarative Programming - Filter Posts - Code Notebook<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/epicmarketing.co.il\/notebook\/declarative-programming-filter-posts\/\" \/>\n<meta property=\"og:locale\" content=\"he_IL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Declarative Programming - Filter Posts - Code Notebook\" \/>\n<meta property=\"og:description\" content=\"\u05d1\u05e9\u05dc\u05d1 \u05d4\u05d1\u05d0 \u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05dc\u05e8\u05d0\u05d5\u05ea \u05d0\u05d9\u05da \u05d0\u05e4\u05e9\u05e8 \u05dc\u05d1\u05e6\u05e2 filter \u05e2\u05dc \u05d4\u05d8\u05d1\u05dc\u05d4. \u05e0\u05e0\u05d9\u05d7 \u05e9\u05d0\u05e0\u05d7\u05e0\u05d5 \u05e8\u05d5\u05e6\u05d9\u05dd \u05dc\u05ea\u05ea \u05dc\u05de\u05e9\u05ea\u05de\u05e9 \u05dc\u05d1\u05d7\u05d5\u05e8 \u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05dc\u05e4\u05d9 \u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4. \u05d1\u05ea\u05d5\u05e8 \u05d4\u05ea\u05d7\u05dc\u05d4 \u05e0\u05d1\u05d7\u05e8 \u05d0\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4 \u05e2\u05dd id=1. \u05e9\u05d9\u05de\u05d5\u05e9 \u05d1-filter \u05e7\u05d5\u05d1\u05e5 declarative-posts.component.ts \u05d5\u05d1\u05ea\u05e6\u05d5\u05d2\u05d4 \u05e0\u05e7\u05e8\u05d0 \u05dc-filteredPosts. \u05e0\u05e7\u05d1\u05dc \u05d0\u05ea \u05d4\u05e4\u05d5\u05e1\u05d8\u05d9\u05dd \u05e9\u05e9\u05d9\u05d9\u05db\u05d9\u05dd \u05dc-id 1. \u05d4\u05e9\u05dc\u05d1 \u05d4\u05d1\u05d0 \u05d4\u05d5\u05d0 \u05dc\u05ea\u05ea \u05dc\u05de\u05e9\u05ea\u05de\u05e9 \u05dc\u05d1\u05d7\u05d5\u05e8 \u05d0\u05ea \u05d4\u05e7\u05d8\u05d2\u05d5\u05e8\u05d9\u05d4 \u05e9\u05d4\u05d5\u05d0 \u05e8\u05d5\u05e6\u05d4 \u05d5\u05dc\u05e2\u05d3\u05db\u05df \u05d0\u05ea \u05d4\u05e8\u05e9\u05d9\u05de\u05d4 \u05d1\u05d4\u05ea\u05d0\u05dd. \u05db\u05d3\u05d9 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/epicmarketing.co.il\/notebook\/declarative-programming-filter-posts\/\" \/>\n<meta property=\"og:site_name\" content=\"Code Notebook\" \/>\n<meta property=\"article:published_time\" content=\"2023-10-05T22:00:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-05T22:01:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/epicmarketing.co.il\/notebook\/wp-content\/uploads\/2023\/10\/declarative6-1024x349.png\" \/>\n<meta name=\"author\" content=\"kerendanino\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u05e0\u05db\u05ea\u05d1 \u05e2\u05dc \u05d9\u05d3\" \/>\n\t<meta name=\"twitter:data1\" content=\"kerendanino\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u05d6\u05de\u05df 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