Is it possible to escape a character inside a handlebar?-CodePudding

I would like to be able to insert a comma inside handlabars.js, for example: {{ JOURNAL \, }} rendering a comma for each item that exists, so there won't be nonsense commas due to a non existing key-value pair. Thank you all!

{{#each items}}
 <button class="accordion-button"
     {{#if (equals type "article")}}  {{AUTHOR}} {{TITLE}} {{JOURNAL}}, {{VOLUME}}({{NUMBER}})  {{MONTH}} {{YEAR}}                        {{/if}}
 </button>    
{{/each}}

CodePudding user response：

You can check if JOURNAL exists. Then include it and a trailing comma only if it does.

{{#if JOURNAL}}{{JOURNAL}}, {{/if}}

You can also create your own custom helper:

Handlebars.registerHelper('ifExistAddComma', function (str) {
    return str === undefined ? '' : `${str}, `;
})

{{ifExistAddComma JOURNAL}}

See playground

Edit: You can write a more complex (but also more general) custom helper for joining any number of arguments with a custom deliminator:

Handlebars.registerHelper('join', function (delim, ...args) {
  args.pop() // remove meta information
  return args
    .filter(arg => arg !== undefined) // filter out undefined properties
    .join(delim);
})

{{join ', ' AUTHOR TITLE JOURNAL (join '' VOLUME '(' NUMBER ')') MONTH YEAR}}

author, title, journal, volume(number), month, year

See arg !== undefined) // filter out undefined properties\n .join(delim);\n});\n","handlebarsVersion":"4.7.7"}" rel="nofollow noreferrer">playground