{"id":7466,"date":"2019-10-11T05:59:15","date_gmt":"2019-10-11T05:59:15","guid":{"rendered":"https:\/\/www.jose-aguilar.com\/blog\/?p=7466"},"modified":"2019-10-11T06:00:12","modified_gmt":"2019-10-11T06:00:12","slug":"como-crear-plantillas-literales-en-javascript","status":"publish","type":"post","link":"https:\/\/www.jose-aguilar.com\/blog\/como-crear-plantillas-literales-en-javascript\/","title":{"rendered":"C\u00f3mo crear plantillas literales en JavaScript"},"content":{"rendered":"<p>Una de las grandes mejoras que trae las \u00faltimas versiones de <strong>JavaScript<\/strong> es el cambio o mejora sobre los <em>template literals<\/em> o <strong>plantillas literales<\/strong>.<\/p>\n<p>Las <strong>plantillas literales<\/strong>\u00a0son <strong>cadenas de texto<\/strong> que habilitan el uso de expresiones incrustadas generalmente en etiquetas <strong>HTML<\/strong>. Es posible utilizar cadenas de texto de m\u00e1s de una l\u00ednea y funcionalidades de interpolaci\u00f3n de cadenas de textos con ellas.<\/p>\n<p>Desde el c\u00f3digo <strong>JavaScript<\/strong> es posible crear plantillas <strong>HTML<\/strong> con variables o expresiones incrustadas para incorporar de forma din\u00e1mica en la p\u00e1gina web.<\/p>\n<p>En la versi\u00f3n anterior de <strong>JavaScript<\/strong> los <em>template literals<\/em> se pod\u00edan hacerse de la siguiente forma:<\/p>\n<div id=\"wpshdo_1\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_1\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_1\"><\/a><a id=\"wpshat_1\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_1\"  onClick=\"javascript:wpsh_toggleBlock(1)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_1\" onClick=\"javascript:wpsh_code(1)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_1\" onClick=\"javascript:wpsh_print(1)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_1\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\"><span class=\"kw2\">const<\/span> producto1 <span class=\"sy0\">=<\/span> <span class=\"st0\">'Ordenador de mesa'<\/span><span class=\"sy0\">;<\/span>\n<span class=\"kw2\">const<\/span> precio1 <span class=\"sy0\">=<\/span> <span class=\"nu0\">625<\/span><span class=\"sy0\">;<\/span>\n<span class=\"kw2\">const<\/span> producto2 <span class=\"sy0\">=<\/span> <span class=\"st0\">'Portatil'<\/span><span class=\"sy0\">;<\/span>\n<span class=\"kw2\">const<\/span> precio2 <span class=\"sy0\">=<\/span> <span class=\"nu0\">869<\/span><span class=\"sy0\">;<\/span>\n&nbsp;\nlet html<span class=\"sy0\">;<\/span>\n&nbsp;\n<span class=\"co2\">\/* literales *\/<\/span>\nhtml <span class=\"sy0\">=<\/span> <span class=\"st0\">'&lt;table border=&quot;1&quot;&gt;'<\/span> <span class=\"sy0\">+<\/span>\n        <span class=\"st0\">'&lt;tr&gt;&lt;td&gt;Producto&lt;\/td&gt;&lt;td&gt;Precio&lt;\/td&gt;&lt;\/tr&gt;'<\/span> <span class=\"sy0\">+<\/span>\n        <span class=\"st0\">'&lt;tr&gt;&lt;td&gt;'<\/span><span class=\"sy0\">+<\/span>producto1<span class=\"sy0\">+<\/span><span class=\"st0\">'&lt;\/td&gt;&lt;td align=&quot;right&quot;&gt;'<\/span><span class=\"sy0\">+<\/span>precio1<span class=\"sy0\">+<\/span><span class=\"st0\">' \u20ac&lt;\/td&gt;&lt;\/tr&gt;'<\/span> <span class=\"sy0\">+<\/span>\n        <span class=\"st0\">'&lt;tr&gt;&lt;td&gt;'<\/span><span class=\"sy0\">+<\/span>producto2<span class=\"sy0\">+<\/span><span class=\"st0\">'&lt;\/td&gt;&lt;td align=&quot;right&quot;&gt;'<\/span><span class=\"sy0\">+<\/span>precio2<span class=\"sy0\">+<\/span><span class=\"st0\">' \u20ac&lt;\/td&gt;&lt;\/tr&gt;'<\/span> <span class=\"sy0\">+<\/span>\n        <span class=\"st0\">'&lt;tr&gt;&lt;td&gt;Total&lt;\/td&gt;&lt;td align=&quot;right&quot;&gt;'<\/span><span class=\"sy0\">+<\/span>getTotal<span class=\"br0\">&#40;<\/span>precio1<span class=\"sy0\">,<\/span> precio2<span class=\"br0\">&#41;<\/span><span class=\"sy0\">+<\/span><span class=\"st0\">' \u20ac&lt;\/td&gt;&lt;\/tr&gt;'<\/span> <span class=\"sy0\">+<\/span>\n        <span class=\"st0\">'&lt;tr&gt;&lt;td&gt;Total (Impuestos Incl.)&lt;\/td&gt;&lt;td align=&quot;right&quot;&gt;'<\/span><span class=\"sy0\">+<\/span>getTotalWithTax<span class=\"br0\">&#40;<\/span>precio1<span class=\"sy0\">,<\/span> precio2<span class=\"br0\">&#41;<\/span><span class=\"sy0\">+<\/span><span class=\"st0\">' \u20ac&lt;\/td&gt;&lt;\/tr&gt;'<\/span> <span class=\"sy0\">+<\/span>\n        <span class=\"st0\">'&lt;\/table&gt;'<\/span><span class=\"sy0\">;<\/span>\n<span class=\"co2\">\/* literales *\/<\/span>\n&nbsp;\n<span class=\"kw2\">function<\/span> getTotal<span class=\"br0\">&#40;<\/span>precio1<span class=\"sy0\">,<\/span> precio2<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n    <span class=\"kw1\">return<\/span> precio1 <span class=\"sy0\">+<\/span> precio2<span class=\"sy0\">;<\/span>\n<span class=\"br0\">&#125;<\/span>\n&nbsp;\n<span class=\"kw2\">function<\/span> getTotalWithTax<span class=\"br0\">&#40;<\/span>precio1<span class=\"sy0\">,<\/span> precio2<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n    <span class=\"kw1\">return<\/span> Math.<span class=\"me1\">round<\/span><span class=\"br0\">&#40;<\/span><span class=\"br0\">&#40;<\/span>precio1 <span class=\"sy0\">+<\/span> precio2<span class=\"br0\">&#41;<\/span> <span class=\"sy0\">*<\/span> 1.21<span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n<span class=\"br0\">&#125;<\/span>\n&nbsp;\ndocument.<span class=\"me1\">getElementById<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">'app'<\/span><span class=\"br0\">&#41;<\/span>.<span class=\"me1\">innerHTML<\/span> <span class=\"sy0\">=<\/span> html<span class=\"sy0\">;<\/span><\/pre><\/div><\/div>\n<p>Esta forma todav\u00eda funciona pero puedes\u00a0observar que concatena con el signo \u00ab+\u00bb el <strong>HTML<\/strong> con las variables vi\u00e9ndose un poco extra\u00f1o.<\/p>\n<p>El c\u00f3digo tiene 4 variables que representan los nombres y precios de 2 productos. Creo una variable que la nombro con el nombre \u00abhtml\u00bb para incrustarle las etiquetas <strong>HTML<\/strong> con las variables y llamada a funciones. Lo que compone una plantilla literal.<\/p>\n<p>En la versi\u00f3n actual de <strong>JavaScript<\/strong> se puede hacer de una forma m\u00e1s simple y ordenada:<\/p>\n<div id=\"wpshdo_2\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_2\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_2\"><\/a><a id=\"wpshat_2\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_2\"  onClick=\"javascript:wpsh_toggleBlock(2)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_2\" onClick=\"javascript:wpsh_code(2)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_2\" onClick=\"javascript:wpsh_print(2)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_2\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\"><span class=\"kw2\">const<\/span> producto1 <span class=\"sy0\">=<\/span> <span class=\"st0\">'Ordenador de mesa'<\/span><span class=\"sy0\">;<\/span>\n<span class=\"kw2\">const<\/span> precio1 <span class=\"sy0\">=<\/span> <span class=\"nu0\">625<\/span><span class=\"sy0\">;<\/span>\n<span class=\"kw2\">const<\/span> producto2 <span class=\"sy0\">=<\/span> <span class=\"st0\">'Portatil'<\/span><span class=\"sy0\">;<\/span>\n<span class=\"kw2\">const<\/span> precio2 <span class=\"sy0\">=<\/span> <span class=\"nu0\">869<\/span><span class=\"sy0\">;<\/span>\n&nbsp;\nlet html<span class=\"sy0\">;<\/span>\n&nbsp;\n<span class=\"co2\">\/* literales *\/<\/span>\nhtml <span class=\"sy0\">=<\/span> `\n    <span class=\"sy0\">&lt;<\/span>table border<span class=\"sy0\">=<\/span><span class=\"st0\">&quot;1&quot;<\/span><span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;<\/span>tr<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td<span class=\"sy0\">&gt;<\/span>Producto<span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td<span class=\"sy0\">&gt;<\/span>Precio<span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;\/<\/span>tr<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;<\/span>tr<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td<span class=\"sy0\">&gt;<\/span>$<span class=\"br0\">&#123;<\/span>producto1<span class=\"br0\">&#125;<\/span><span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td align<span class=\"sy0\">=<\/span><span class=\"st0\">&quot;right&quot;<\/span><span class=\"sy0\">&gt;<\/span>$<span class=\"br0\">&#123;<\/span>precio1<span class=\"br0\">&#125;<\/span> \u20ac<span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;\/<\/span>tr<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;<\/span>tr<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td<span class=\"sy0\">&gt;<\/span>$<span class=\"br0\">&#123;<\/span>producto2<span class=\"br0\">&#125;<\/span><span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td align<span class=\"sy0\">=<\/span><span class=\"st0\">&quot;right&quot;<\/span><span class=\"sy0\">&gt;<\/span>$<span class=\"br0\">&#123;<\/span>precio2<span class=\"br0\">&#125;<\/span> \u20ac<span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;\/<\/span>tr<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;<\/span>tr<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td<span class=\"sy0\">&gt;<\/span>Total<span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td align<span class=\"sy0\">=<\/span><span class=\"st0\">&quot;right&quot;<\/span><span class=\"sy0\">&gt;<\/span>$<span class=\"br0\">&#123;<\/span>getTotal<span class=\"br0\">&#40;<\/span>precio1<span class=\"sy0\">,<\/span> precio2<span class=\"br0\">&#41;<\/span><span class=\"br0\">&#125;<\/span> \u20ac<span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;\/<\/span>tr<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;<\/span>tr<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td<span class=\"sy0\">&gt;<\/span>Total <span class=\"br0\">&#40;<\/span>Impuestos Incl.<span class=\"br0\">&#41;<\/span><span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n            <span class=\"sy0\">&lt;<\/span>td align<span class=\"sy0\">=<\/span><span class=\"st0\">&quot;right&quot;<\/span><span class=\"sy0\">&gt;<\/span>$<span class=\"br0\">&#123;<\/span><span class=\"sy0\">+<\/span>getTotalWithTax<span class=\"br0\">&#40;<\/span>precio1<span class=\"sy0\">,<\/span> precio2<span class=\"br0\">&#41;<\/span><span class=\"br0\">&#125;<\/span> \u20ac<span class=\"sy0\">&lt;\/<\/span>td<span class=\"sy0\">&gt;<\/span>\n        <span class=\"sy0\">&lt;\/<\/span>tr<span class=\"sy0\">&gt;<\/span>\n    <span class=\"sy0\">&lt;\/<\/span>table<span class=\"sy0\">&gt;<\/span>\n`<span class=\"sy0\">;<\/span>\n<span class=\"co2\">\/* literales *\/<\/span>\n&nbsp;\n<span class=\"kw2\">function<\/span> getTotal<span class=\"br0\">&#40;<\/span>precio1<span class=\"sy0\">,<\/span> precio2<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n    <span class=\"kw1\">return<\/span> precio1 <span class=\"sy0\">+<\/span> precio2<span class=\"sy0\">;<\/span>\n<span class=\"br0\">&#125;<\/span>\n&nbsp;\n<span class=\"kw2\">function<\/span> getTotalWithTax<span class=\"br0\">&#40;<\/span>precio1<span class=\"sy0\">,<\/span> precio2<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n    <span class=\"kw1\">return<\/span> Math.<span class=\"me1\">round<\/span><span class=\"br0\">&#40;<\/span><span class=\"br0\">&#40;<\/span>precio1 <span class=\"sy0\">+<\/span> precio2<span class=\"br0\">&#41;<\/span> <span class=\"sy0\">*<\/span> 1.21<span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n<span class=\"br0\">&#125;<\/span>\n&nbsp;\ndocument.<span class=\"me1\">getElementById<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">'app'<\/span><span class=\"br0\">&#41;<\/span>.<span class=\"me1\">innerHTML<\/span> <span class=\"sy0\">=<\/span> html<span class=\"sy0\">;<\/span><\/pre><\/div><\/div>\n<p>En este caso, si te fijas bien en los literales, las plantillas de cadenas de texto se delimitan con el car\u00e1cter de comillas o tildes invertidas, en lugar de las cadenas simples o dobles.<\/p>\n<p>Las plantillas de cadenas de texto pueden contener marcadores, identificados por el signo de d\u00f3lar y envueltos en llaves (${variable}).<\/p>\n<p>El signo \u00ab+\u00bb, que se usaba antiguamente, deja de ser utilizado y se puede armar una estructura <strong>HTML<\/strong> tabulada correctamente, lo que permite que su lectura sea mucho m\u00e1s c\u00f3moda y r\u00e1pida.<\/p>\n<p>Una de las ventajas m\u00e1s significativas de los <em>template literals<\/em> o plantillas literales en <strong>JavaScript<\/strong> ES6 es que pueden usar funciones en sus templates.<\/p>\n<p>En realidad, cualquier cosa del lenguaje <strong>JavaScript<\/strong> puede estar dentro de una plantilla literal: una funci\u00f3n, un m\u00e9todo, o cualquier operador puede estar dentro de un <em>template literal<\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tutorial y c\u00f3digo de ejemplo en el que puedes ver como crear plantillas literales en JavaScript. Puedes ver la versi\u00f3n moderna y la versi\u00f3n anterior.<\/p>\n","protected":false},"author":1,"featured_media":7467,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[105],"class_list":["post-7466","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-textos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00f3mo crear plantillas literales en JavaScript - Jose Aguilar Blog<\/title>\n<meta name=\"description\" content=\"Tutorial y c\u00f3digo de ejemplo en el que puedes ver como crear plantillas literales en JavaScript. 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