Use JavaScript and Handlebars to compile any templates that have not yet been compiled

Question

Use JavaScript and Handlebars to compile any templates that have not yet been compiled

I have an HTML file containing various templates that I want to compile when the page loads. I'm looking for a way to either compile and store all templates in an array upfront, or compile templates on the fly as users navigate through the SPA. I am using JS and Handlebars.js for this project. Can you offer any guidance on how to accomplish this? Currently, I have a function that needs modification and implementation:

function compile_template(template) {
    var template_source;
    if (templates_compiled[template] === undefined)
        {
            template_source = $("#" + template).html();
            return Handlebars.compile(template_source);
        }
}

To implement the function, I use the following code:

template = "template_projects";
        templates_compiled[template] = compile_template(template);

        $("#div_page_data_container").html(templates_compiled[template](page_data));

javascript compilation handlebars.js html-templates

Answer 1

Answer №1

It's unclear what exactly is causing the issue you're experiencing. It seems like there might be external factors influencing the situation beyond the provided code.

Nevertheless, I can offer some suggestions to improve the efficiency of your caching function.

One issue I notice is that the compile_template function retrieves data from the templates_compiled cache object but does not update it. This means that any code calling compile_template must manually remember to store the result in templates_compiled.

Additionally, compile_template returns nothing (i.e., undefined) when

templates_compiled[template] === undefined

is false. This shifts the burden to the calling code to verify the existence of templates_compiled[template] before invoking compile_template, exposing the inner workings of the cache lookup.

To address these issues, I recommend restructuring the caching function so that only the function itself interacts with the cache. Here's an improved implementation:

const compiledTemplates = {};
function getCompiledTemplate(key) {
  if (compiledTemplates[key]) {
    return compiledTemplates[key];
  }
  
  const templateSource = $(`#${key}`).html();
  const compiledTemplate = Handlebars.compile(templateSource);
  
  compiledTemplates[key] = compiledTemplate;
  
  return compiledTemplate;
}

let template;
template = getCompiledTemplate('template_projects'); // template is freshly compiled by Handlebars as it's not in the cache
template = getCompiledTemplate('template_projects'); // the pre-compiled template is retrieved from the cache

Answer 2

It's unclear what exactly is causing the issue you're experiencing. It seems like there might be external factors influencing the situation beyond the provided code.

Nevertheless, I can offer some suggestions to improve the efficiency of your caching function.

One issue I notice is that the compile_template function retrieves data from the templates_compiled cache object but does not update it. This means that any code calling compile_template must manually remember to store the result in templates_compiled.

Additionally, compile_template returns nothing (i.e., undefined) when

templates_compiled[template] === undefined

is false. This shifts the burden to the calling code to verify the existence of templates_compiled[template] before invoking compile_template, exposing the inner workings of the cache lookup.

To address these issues, I recommend restructuring the caching function so that only the function itself interacts with the cache. Here's an improved implementation:

const compiledTemplates = {};
function getCompiledTemplate(key) {
  if (compiledTemplates[key]) {
    return compiledTemplates[key];
  }
  
  const templateSource = $(`#${key}`).html();
  const compiledTemplate = Handlebars.compile(templateSource);
  
  compiledTemplates[key] = compiledTemplate;
  
  return compiledTemplate;
}

let template;
template = getCompiledTemplate('template_projects'); // template is freshly compiled by Handlebars as it's not in the cache
template = getCompiledTemplate('template_projects'); // the pre-compiled template is retrieved from the cache

Use JavaScript and Handlebars to compile any templates that have not yet been compiled

Answer №1

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