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JS Browser BOM JS Window JS Screen JS Location JS History JS Navigator JS Popup Alert JS Timing JS Cookies JS HTML DOM DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM Forms DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists JS Async JS Callbacks JS Asynchronous JS Promises JS Async/Await
JS Classes Class Intro Class Inheritance Class Static JS Functions Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Bind Function Closures JS Objects Object Definitions Object Properties Object Methods Object Display Object Accessors Object Constructors Object Prototypes Object Iterables Object Sets Object Maps Object Reference This way, that line will only run when the function is called.JS Tutorial JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words Move that line inside the function, and it should work. Thus, document.getElementById('lolz') will return null, and document.getElementById('lolz').value should cause an error. line is evaluated before the browser knows about the existance of an input with id lolz.
#Input for a textbar on js code#
Your code is parsed line by line, and the lol =. Is before the actual element on your markup: Notice that this line: lol = document.getElementById('lolz').value
#Input for a textbar on js how to#
This specification includes examples that illustrate how to avoid using deprecated elements. Deprecated elements may become obsolete in future versions of HTML. Its value is an identifier for the language, but since these identifiers are not standard, this attribute has been deprecated in favor of type.Ī deprecated element or attribute is one that has been outdated by newer constructs.
This attribute specifies the scripting language of the contents of this element. See W3 HTML4 Specification, the SCRIPT element:ĭeprecated. Note that the script element must follow the input element it refers to, because elements are only queryable with getElementById if they already have been parsed and created.Įdit: I removed the language="javascript" attribute, because it's deprecated. Var lol = document.getElementById('lolz') If you insist var lol to be set outside the function kk, then I propose this solution: Var lol = document.getElementById('lolz').value You can inadvertently overwrite important data in this way.
Even if this could work, it's bad programming style. click() to bind kk's onclick handler, instead of doing that inline in the HTML.ĭo not use global variables in this way. The function will be run as soon as the DOM is ready. This can be done with "plain" JavaScript, but it's much easier to use a DOM library like jQuery. The other option is to wait until the DOM is ready (which is usually much earlier than onload). There is, however, a problem with onload: it waits until everything (including images, etc.) is loaded. (On a side note: the language attribute of the tag is deprecated. One is to wait until the entire document is loaded, like this: You've already found the most obvious solution: by calling getElementById inside the function, the DOM will be loaded and ready by the time the function is called, and the element will be found like you expect it to. Because of that, getElementById will return null ( see MDN). The reason you function doesn't work when lol is defined outside it, is because the DOM isn't loaded yet when the JavaScript is first run.
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