Hopefully this can save someone the frustration that I just went through. After 30+ minutes of searches and drudging through lacking documentation, I finally found this post, which led me to my answer.Īt least in Chrome on MacOS, the Date object sources its locale from Intl.DateTimeFormat().resolvedOptions().locale, which was not documented anywhere that I could find. Below we show a function where the default size is 'big', default co-ordinates are x: 0, y: 0 and default radius is 25. Default values can be specified using, and will be used as variable values if a specified property does not exist in the passed object. Though my languages are US-only, my machine region is set to Ireland, and toLocaleDateString was reading that somehow and formatting the date in the Irish style, DD/MM/YYYY, as opposed to the US style, MM/DD/YYYY. Setting a function parameter's default value. New Date().toLocaleDateString(navigator.languages) Here's what I saw on my console: new Date().toDateString() Most Google results will land you on navigator.languages, but my machine was definitely not using those values. Return Value: It returns the object after filling in its undefined properties. It contains the key, value pair of an object. I would just like to answer this in 2023 for anyone struggling with exactly the issue of the original post: where Date gets its default locale. defaults (object, defaults) Parameters: This function accepts two parameter as mentioned above and described below: object: This parameter holds the value of an object. Most modern browsers allow you to change your current default locale in their preferences (Chrome shown): Given below is an example of how to set the javascript default parameter for a function. This means that if we do not pass any argument in the function, the function automatically assigns the value undefined. As we know, the default value of the parameter in JavaScript is undefined. While it's true that it would be nice to have this standardized as well, it's more beneficial to get everyone on board for a broad spec first and then work out the little kinks later. Setting JavaScript Default Parameters for a Function. This is intentional, as it allows browser vendors to keep their current, differing implementations to stay conforming without much fuss. This means that getting the default locale is implementation dependent and can differ from browser to browser. The DefaultLocale abstract operation returns a String value representing the language tag for the host environment’s current locale. Your default language may also depend on the installer you've used to install your browser.įollowing the ECMAScript spec, conforming browsers (and other environments, such as Node.js) should implement localization following the ECMAScript Internationalization API (ECMA-402), which only outlines the following for getting the default locale: Var theCSSprop = window.getComputedStyle(elem,null).getPropertyValue("left") ĭocument.getElementById("output").To summarize shortly, detecting the current locale is implementation dependent and may differ from environment to environment. By declaring fields up-front, class definitions become more self-documenting, and. Fields without default values default to undefined. As seen above, the fields can be declared with or without a default value. Var elem = document.getElementById("elem-container") In JavaScript, private features use a special identifier syntax, so modifier keywords like public and private should not be used either. The best I have is cloning the node and reading the height and storing in a property ( ), but this is not really getting the browser's default css value (especially if this is set in ems). I'd also keep the dummy div at top:25px, so removing the style property won't work. In the example below, I'd like the output to read 100px (the value in the CSS), rather than 10px, as getComputedStyle gives. I'm trying to work out how, after changing style properties with javascript, I can revert to the value in the stylesheet (including the units).
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