It can’t be set by assignment during execution, and it may be different each time the function is called. The value of this in most cases, is determined by how a function is called. This is a special variable available inside the context of a function when it is invoked. Let’s begin with a basic understanding of what a this variable actually is and then we’ll see how a this variable gets it’s value. So I did some digging into it and found out why this assignment was a necessity back then and how we can overcome them. ![]() ![]() that = thisįirst impressions, you could figure out that it had something to do with the value of the variable this being inconsistent, so they had to store in a variable and use it later. If the id contains characters like periods or colons you have toĮscape those characters with backslashes.When you go through some of the popular JS libraries you might start noticing this peculiar line all over the place. Should not be relied on, however a document with more than one Will only select the first matched element in the DOM. One element has been assigned the same ID, queries that use that ID Unless it is clear that performance needs to be improved.Įach id value must be used only once within a document. Do not focus on optimization of selector speed Performs an additional check before identifying the element as aĪs always, remember that as a developer, your time is typically the ![]() Selector is attached to the id selector, such as h2#pageTitle, jQuery In your example, it would select the element with the ID of "searchTerm".įor id selectors, jQuery uses the JavaScript functionĭocument.getElementById(), which is extremely efficient. It's one way jQuery can select an element. That's jQuery and the pound sign (#) refers to an element's ID.
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