So, you can create a function that store value in object on keyup or keydown event.Ĭonsole.log(data. We need to write four lines to fetch the value of an input field. Thenĭocument.getElementById('something').value is annoying. You can use onkeyup when you have more than one input field. document.querySelectorAll('').value selected by name.document.querySelectorAll('input').value selected by tagname.document.querySelectorAll('.searchField').value selected by class.document.querySelectorAll('#searchTxt').value selected by id.document.querySelector('').value selected by nameĭocument.querySelectorAll('selector').value which also uses a CSS selector to select elements, but it returns all elements with that selector as a static Nodelist.document.querySelector('input').value selected by tagname.document.querySelector('.searchField').value selected by class.document.querySelector('#searchTxt').value selected by id.Use the powerful document.querySelector('selector').value which uses a CSS selector to select the element For example Method 4ĭocument.getElementsByName('name').value which also >returns a live NodeList For exampleĭocument.getElementsByName("searchTxt").value if this is the first textbox with name 'searchtext' in your page. Use document.getElementsByTagName('tag_name').value which also returns a live HTMLCollection For exampleĭocument.getElementsByTagName("input").value, if this is the first textbox in your page. Method 2ĭocument.getElementsB圜lassName('class_name').value which returns a Live HTMLCollection For exampleĭocument.getElementsB圜lassName("searchField").value if this is the first textbox in your page. For the first element, use ,įor the second one use, and so on. Note: Method 2,3,4 and 6 returns a collection of elements, so use to get the desired occurrence. This way, that line will only run when the function is called.There are various methods to get an input textbox value directly (without wrapping the input element inside a form element): Method 1ĭocument.getElementById('textbox_id').value to get the value ofĭocument.getElementById("searchTxt").value ![]() 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. 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 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: npm init vuelatest Enter the project name and preset the project as follows: Project Structure: After successful installation, the following project structure will be formed. ![]() Var lol = document.getElementById('lolz').value Step 1: Create a new Vue.js project with the npm node.js package manager using the following command. 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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