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Each Help Center theme consists of a collection of editable page templates that define the layout of different types of pages in Help Center. For example, there's a template for knowledge base articles, a template for the list of requests, and so on.
Each template consists of a mix of HTML markup and Handlebars-like expressions, identifiable in the template by double curly brackets. Handlebars is a simple templating engine that lets you insert or manipulate content on a page at render-time rather than at design-time.
The templating highlight author comments options trading in Help Center is called Curlybars and implements a large subset of the Handlebars language. This guide shows you how use the language to customize your pages in Help Center. Help Center provides you with helpers and named properties to customize your content.
Some are shared and available on all Help Center pages. The rest are page-specific. The example generates a list of users who left comments on the page. The each helper iterates through each value in the page's comments property. For each comment, the values of the highlight author comments options trading. This section introduces the building blocks you need to write any template.
For more information, see Help Center Templates on developer. A Curlybars template is made up of two things: This implies that an empty template is also a valid template, and a template that contains only text is also a valid one. For instance, the following is a valid template:. Of course, highlight author comments options trading Help Center templates only supported verbatim text, you couldn't really customize them at render-time. The following sections explain how to write valid expressions to make highlight author comments options trading changes to the template.
Note that nesting a pair of curlies within other pair of curlies is not valid syntax. For example, the following isn't allowed:. There are situations where having some notes in the template that do not leak into the rendered page might come in handy. For this purpose, Curlybars allows to make comments putting an exclamation mark right after the opening curlies, without any space: You can use this syntax to add a code comment in the example:.
This effect of discarding anything within the comments can actually come in handy while developing a template. You might want to comment out some code to do some checks, debug, and more. Unfortunately, the comment syntax described so far isn't suitable for commenting out Curlybars code. To comment out Curlybars code, use the following syntax: This kind of comment can span several lines and effectively comment out code.
To include values that you want Curlybars to interpret exactly as they're written, Curlybars supports the concept of literals. A literal can highlight author comments options trading 3 types of values: To express a string, you can use both single highlight author comments options trading double quotes, but you can't mix them.
For example, 'this is a valid string'"this is valid as well"but "this is not valid'. A number can be any positive or negative integer. A boolean is represented by true and false. No other variation is allowed. Every template in Help Center has access to a context that represents data about your Help Center. For instance, the Article Page template has an object named article that exposes the structure of the article requested by the users. For all the properties you can use in your templates, highlight author comments options trading Help Center Templates on developer.
Use dot notation to pluck a specific information from these objects. A simple example is article. The fully qualified name of a property is sometimes called a path. For example, name is a property in the author object, but article. You can display the value of a property by enclosing it within double curly highlight author comments options trading. Getting back to the example, you might want to print out the name highlight author comments options trading the author in a separate paragraph:.
Let's say a user wants to see an article written by an agent named John Venturini. The template will be rendered as follows:. You might also want to render the article itself. The article object has a body property that contains the content of the article. You'd modify the template as follows to render the body of the article:. In addition to rendering property values, the templating language lets you add conditional rendering logic to your templates. For instance, you might want to render a snippet of HTML in case the requested article is internal.
The Article Page context has an article. You can create an if block with this information. The if expression must specify a condition that's true or false.
The result determines whether the content in the block is rendered or not. Here's the basic syntax:. You might want to render a block when the condition is false. In that case, use an unless block. The syntax is similar to the if block:. Back to the example, suppose you also want to render a message when an article is not internal. You can modify the template as follows:. This highlight author comments options trading of conditional logic -- "if true do this or else do this" -- is usually handled by an if-else block.
The syntax is as follows:. The unless block also has an unless-else variant. You could use it to achieve the same result as an if-else block:. A condition is usually a Help Center property such as article. Some properties don't have boolean values.
These properties are evaluated as follows:. If the value is a collection of objects, an empty collection is false and any other collection is true. Suppose you want to set up some conditional logic that checks numbers.
The Article Page has an article. You can use the if condition to test if the count is not 0 and display some cheerful message. When Curlybars processes a template, it displays any verbatim text as is. That's good and works well most of the time.
However, sometimes you need to have more control on the blank characters next to an expression. Take the following code for example:. There's a leading and highlight author comments options trading trailing space around the word highlight.
This of course works fine, but suppose you want to keep the spaces in the template without rendering them. Adding a tilde character in your opening or closing curly brackets trims white space from the enclosed text.
The tilde character trims any blank character that doesn't have a graphical representation but affects spacing or split lines, such highlight author comments options trading newlines, tabs, carriage returns, line feeds, simple spaces, or tabs.
This means you can take the example to an extreme and express the previous if block on more lines to make it more readable. These examples don't make much sense in real life, but the effectiveness of using the tilde character can vary from case to case.
Accessing data, displaying it, and adding some conditional logic can be all you need in some templates. Still, you highlight author comments options trading like some added functionality. For example, you might want to display a localized string that changes according to the locale of the page requester. Or you might want to truncate a long passage of text. You can get this kind of functionality in templates with helpers. For all the helpers you can use in your templates, see Help Center Templates on developer.
For example, you can use a helper named excerpt in the Article page template to truncate strings. In the article example, suppose you need to show a truncated version of the article title. You can do this by modifying the template as follows:. The example above shows that curly brackets are used to invoke a helper. The excerpt helper accepts a parameter that consists of an expression that resolves to a string. The helper has a characters option to specify the number of characters to keep.
The characters option isn't mandatory. If you don't specify it, a default value is used. Highlight author comments options trading excerpt in Help Center Highlight author comments options trading for further details.
The only mandatory element is the name of the helper.