Tpl

This library for convenient templating html and other text content in runtime without special bundlers (as Webpack and etc) or special template engine (as Pug, Handlebars and etc), only javascript. It allows to use condition operators if/else if/else and switch/case/default. The library allows you to collect html code in functional style with methods: forEach, each (forEach for object).

Install

npm i @ignis-web/tpl -S

List methods:

• if/else/else if
• switch/case/default
• forEach
• each
• class

if/else_if/else

const tpl = require('@ignis-web/tpl');

const score = 12;
const html = `
  <div>
    ${tpl
      .if(score < 0, () => `<span>Negative: ${score}</span>`)
      .else_if(score > 0 && score < 100, () => `<span>From 0 to 100: ${score}</span>`)
      .else(() => `<span>Default: ${score}</span>`)
    }
  </div>
  `;
console.log(html); // => <div><span>From 0 to 100: 12</span></div>

You can use only if or if/else as in usual javascript code. Example if:

let score = -10;
let html = `
  <div>
    ${tpl.if(score < 0, () => `<span>Negative: ${score}</span>`)}
  </div>
  `;
console.log(html); // => <div><span>Negative: -10</span></div>

Example if/else if:

let score = 15;
let html = `
  <div>
    ${
      tpl
      .if(score < 0, () => `<span>Negative: ${score}</span>`)
      .else_if(score > 0 && score < 100, () => `<span>From 0 to 100: ${score}</span>`)
    }
  </div>
  `;
console.log(html); // => <div><span>From 0 to 100: 15</span></div>

Example if/else:

let score = 100;
let html = `
  <div>
    ${tpl
      .if(score < 0, () => `<span>Negative: ${score}</span>`)
      .else(() => `<span>Default: ${score}</span>`)
    }
  </div>
  `;
console.log(html); // =>  <div><span>Default: 100</span></div>

Note:

You can pass string as second argument instead of function, if you want to use static content:

const score = 12;
const html = `
  <div>
    ${tpl
      .if(score < 0, `<span>Negative: ${score}</span>`)
      .else_if(score > 0 && score < 100, `<span>From 0 to 100: ${score}</span>`)
      .else(`<span>Default: ${score}</span>`)
    }
  </div>
  `;
console.log(html); // => <div><span>From 0 to 100: 12</span></div>

switch/case/default

const score = 12;
const html = `
  <div>
    ${tpl
      .switch(score)
        .case(12, () => `<span>Total: ${score*2} === 24</span>`)
        .case(100, () => `<span>Total: ${score*2} === 200 </span>`)
        .default(() => `<span>Default: ${score}</span>`)
    }
  </div>
  `;
console.log(html); // => <div><span>Total 24</span></div>

You can pass string as second argument instead of function, if you want to use static content:

const score = 100;
const html = `
  <div>
    ${tpl
      .switch(score)
        .case(12, `<span>Total: ${score} === 24</span>`)
        .case(100, `<span>Total: ${score} === 100 </span>`)
        .default(`<span>Default: ${score}</span>`)
    }
  </div>
  `;
console.log(html); // => <div><span>Total: 100</span></div>

You can pass list as first argument in .case:

const score = 12;
const html = `
  <div>
    ${tpl
      .switch(score)
        .case([ 12, 25 ], () => `<span>Total: ${score}</span>`)
        .default(() => `<span>Default: ${score}</span>`)
    }
  </div>
  `;
console.log(html); // => <div><span>Total 12</span></div>

forEach

For rendering array:

const scores = [12, 100, 24];
const html = `
  <div>
    ${tpl.forEach(scores, (el, i) => `<p>index = ${i}, value = ${el}</p>`)}
  </div>
`;
console.log(html); // =>
/*
<div>
  <p>index = 0, value = 12</p>
  <p>index = 1, value = 100</p>
  <p>index = 2, value = 24</p>
</div>
*/

each

For rendering object:

const scores = { 'Player 1': 12, 'Player 2': 100, 'Player 3': 24 };
const html = `
  <div>
    ${tpl.each(scores, (name, score) => `<p>name = ${name}, scores = ${score}</p>`)}
  </div>
`;
console.log(html); // =>
/*
<div>
  <p>name = Player 1, scores = 12</p>
  <p>name = Player 2, scores = 100</p>
  <p>name = Player 3, scores = 24</p>
</div>
*/

class

Simple switcher for css classes on element like in Vue js:

const is_auth = true;
const html =
  `<div>
    <p ${tpl.class({ 'login-in': is_auth, 'login-out': !is_auth })}></p>
  </div>`;
);
console.log(html); // <div><p class="login-in"></p><div/>