GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Sorry if I wasn't clear -- the. Shit, that might be a bug. If you use Jekyll, that might not work. Not sure though. Do you want to test on the variable being the empty string or do you want to test on it being defined?
Try testing for nil instead maybe? In case anyone comes across this thread, I had to add 1 more piece to the conditional to make it work:.
Jekyll 2 is still using Liquid 2. Are they interchangeable? In Shopify Liquid is one preferable or are there situations where different ones should be used? I'm running Jekyll 3. I tried other solutions mentioned in this thread with no luck.
I found that if the variable has not been set, then I get no value back on the size calculation. To get around this I turned it into a truthy test which seems to be working fine. In case anyone is still having this issue, try comparing against undefined.
I've run into this with page. However, it sounds like the variable was actually nil and that is why that condition didn't work. In my case I was trying to find all files but exclude those without a front matter tag defined, in other words, filter out posts with an empty string like tags:.
I have a collection and am trying to use tags as a property in the frontmatter of pages not posts in this collection. I found that empty works to check whether the tags have any content. For example:.It's very simple to get started with Liquid.
A Liquid template is rendered in two steps: Parse and Render. For an overview of the Liquid syntax, please read Liquid for Designers. The parse step creates a fully compiled template which can be re-used as often as you like. You can store it in memory or in a cache for faster rendering later.
All parameters you want Liquid to work with have to be passed as parameters to the render method. Liquid does not know about your Ruby local, instance, and global variables.
Extending Liquid is very easy. However, keep in mind that Liquid is a young library and requires some outside help. If you create useful filters and tags, please consider making a pull request with them. Filters are methods which take one or more parameters and return a value. For details on how to call a filter with multiple parameters, see the "Output" section of Liquid for Designers. You can use your own filters by:. With filters, note that Liquid just uses the method name as the filter name; there's no extra level of name-mapping like there is with tags and blocks.
As such, make sure your filter method names don't conflict with any existing filters. To create a new tag, simply inherit from Liquid::Tag and register your class with Liquid::Template. Your tag class's initialize method must accept three arguments, and must call super at some point. Your class must define a render method that takes one argument context and returns a string.
The contents of the context argument will vary depending on the environment your tag is being used in. If the output of your tag depends on the arguments it was called with in the template, you'll need to preserve those arguments as instance variables in your initialize method so they'll be available in render. You can also use assigned variables in your tags. To do so, use the context object passed to your render method.
When you render a template, you can pass it assigns and registers. The difference is subtle: assigns are exposed to the template, while registers are exposed to Drops, Tags, and Filters.
The opening tag of a block can also take any number of arguments. All tag blocks are parsed by Liquid. To create a new block, you just have to inherit from Liquid::Block and register your class with Liquid::Template.
If you get errors like A copy of Skip to content. Liquid for Programmers Jump to bottom. First steps It's very simple to get started with Liquid. Pages You signed in with another tab or window.We are always striving to improve our documentation quality, and your feedback is valuable to us. How could this documentation serve you better? Liquid is a template language used to create dynamic content.
There are two types of markup in Liquid: Output and Tag. An output statement is a set of double curly braces containing an expression; when the template is rendered, it gets replaced with the value of that expression. Expressions are statements that have values. Liquid templates can use expressions in several places; most often in output statements, but also as arguments to some tags or filters. Note that there is no way to write a literal array or hash as an expression; arrays and hashes must be passed into the template, or constructed obliquely with a tag or output statement.
Output markup can take filters, which modify the result of the output statement. You can invoke filters by following the output statement's main expression with:. Filters can also be chained together by adding additional filter statements starting with another pipe character. The output of the previous filter will be the input for the next one. Under the hood, a filter is a Ruby method that takes one or more parameters and returns a value. Parameters are passed to filters by position: the first parameter is the expression preceding the pipe character, and additional parameters can be passed using the name: arg1, arg2 syntax described above.
For more on implementing filters, see Liquid for Programmers. Raw temporarily disables tag processing. This is useful for generating content eg, Mustache, Handlebars which uses conflicting syntax. Liquid implements them with the following tags:. The condition of an ifelsif or unless tag should be either a normal Liquid expression or a comparison using Liquid expressions. Note that the comparison operators are implemented by the "if"-like tags; they don't work anywhere else in Liquid.
Note that there is NO "not" operator. Also note that you CANNOT use parentheses to control order of operations, and the precedence of the operators appears to be unspecified. So when in doubt, use nested "if" statements instead of risking it. Often you have to alternate between different colors or similar tasks. Liquid has built-in support for such operations, using the cycle tag.
If no name is supplied for the cycle group, then it's assumed that multiple calls with the same parameters are one group. If you want to have total control over cycle groups, you can optionally specify the name of the group.
This can even be a variable. When iterating a hash, item contains the key, and item contains the value:. Instead of looping over an existing collection, you can also loop through a range of numbers.
Ranges look like Join our Partner program. Shopify Liquid logo. You have no categories selected. Reset category filters. The handle is used to access the attributes of a Liquid object.
Every object in Liquid product, collection, blog, menu has a handle. Learn more.
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What is a handle? How are my handles created? Liquid has access to all of the logical and comparison operators. These can be used in tags such as if and unless. Liquid variables can be initialized by using the assign or capture tags. Numbers include floats and integers. Booleans are either true or false.
No quotations are necessary when declaring a boolean. Nil is an empty value that is returned when Liquid code has no results. Arrays hold a list of variables of all types. To access items in an array, you can loop through each item in the array using a for tag or a tablerow tag. An EmptyDrop object is returned whenever you try to access a non-existent object for example, a collection, page or blog that was deleted or hidden by a handle.
What is truthy? All values in Liquid are truthy, with the exception of nil and false. In this example, the variable is a string type but it evaluates as true. What is falsy? The only values that are falsy in Liquid are nil and false.Liquid crystals LCs are a state of matter which has properties between those of conventional liquids and those of solid crystals.
For instance, a liquid crystal may flow like a liquid, but its molecules may be oriented in a crystal-like way. There are many different types of liquid-crystal phaseswhich can be distinguished by their different optical properties such as textures.
The contrasting areas in the textures correspond to domains where the liquid-crystal molecules are oriented in different directions. Within a domain, however, the molecules are well ordered. LC materials may not always be in a liquid-crystal state of matter just as water may turn into ice or water vapor.1290 Infinity Diode Array Detector
Liquid crystals can be divided into thermotropiclyotropic and metallotropic phases. Thermotropic and lyotropic liquid crystals consist mostly of organic moleculesalthough a few minerals are also known.
Thermotropic LCs exhibit a phase transition into the liquid-crystal phase as temperature is changed. Lyotropic LCs exhibit phase transitions as a function of both temperature and concentration of the liquid-crystal molecules in a solvent typically water.
Metallotropic LCs are composed of both organic and inorganic molecules; their liquid-crystal transition depends not only on temperature and concentration, but also on the inorganic-organic composition ratio.
Examples of liquid crystals can be found both in the natural world and in technological applications. Widespread Liquid-crystal displays use liquid crystals. Lyotropic liquid-crystalline phases are abundant in living systems but can also be found in the mineral world.
For example, many proteins and cell membranes are liquid crystals. Other well-known examples of liquid crystals are solutions of soap and various related detergentsas well as the tobacco mosaic virusand some clays. Previously, other researchers had observed distinct color effects when cooling cholesterol derivatives just above the freezing pointbut had not associated it with a new phenomenon.
Reinitzer perceived that color changes in a derivative cholesteryl benzoate were not the most peculiar feature. He found that cholesteryl benzoate does not melt in the same manner as other compounds, but has two melting points. At The phenomenon is reversible. Seeking help from a physicist, on March 14,he wrote to Otto Lehmannat that time a Privatdozent in Aachen.
They exchanged letters and samples. Lehmann examined the intermediate cloudy fluid, and reported seeing crystallites. Reinitzer's Viennese colleague von Zepharovich also indicated that the intermediate "fluid" was crystalline.
The exchange of letters with Lehmann ended on April 24, with many questions unanswered. Reinitzer presented his results, with credits to Lehmann and von Zepharovich, at a meeting of the Vienna Chemical Society on May 3, By that time, Reinitzer had discovered and described three important features of cholesteric liquid crystals the name coined by Otto Lehmann in : the existence of two melting points, the reflection of circularly polarized lightand the ability to rotate the polarization direction of light.
After his accidental discovery, Reinitzer did not pursue studying liquid crystals further. The research was continued by Lehmann, who realized that he had encountered a new phenomenon and was in a position to investigate it: In his postdoctoral years he had acquired expertise in crystallography and microscopy.Getting started with DotLiquid is very easy.
Liquid for Designers
A DotLiquid template is rendered in two steps: Parse and Render. The Parse step creates a fully compiled template which can be re-used.
You can store it in memory or in a cache for faster rendering later. All parameters you want to use in your DotLiquid templates have to be passed as parameters to the Render method. DotLiquid does not know about your C or VB. NET local or instance variables. Objects that you pass to Template. Render must satisfy one of the following conditions:. Extending DotLiquid is very easy. Creating filters is very easy. Filters are just methods which take one parameter and return a modified string. You can use your own filters by passing an array of filter types to the Render call like this: template.
Once the filter is globally registered, you can simply use it. A filter can access the current context if you add a Context object as the first argument to your filter method.
DotLiquid will automatically pass the current context to your filter:. Please note that currently method overloading is not supported with filters. A workaround is to use different names for your methods. To create a new tag, simply inherit from DotLiquid.
Tag and register your tag with DotLiquid.
DotLiquid for Developers
All tag blocks are parsed by DotLiquid. To create a new block, you just have to inherit from DotLiquid. Block and register your block with DotLiquid. Skip to content. DotLiquid for Developers Jump to bottom. First steps Getting started with DotLiquid is very easy. Render Hash. Rules for template rendering parameters Objects that you pass to Template.
Render must satisfy one of the following conditions: Type is an integral type int, string, decimal, etc. Note that you must specify the allowed member names. Type is registered with Template. Create your own filters Creating filters is very easy. RegisterFilter typeof TextFilter ; Once the filter is globally registered, you can simply use it.Medically reviewed by Drugs. Last updated on Sep 5, NDC Code: Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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