Every input object has a value property that returns the value. I will use this id value in JavaScript to get the reference object of the field. It doesn't matter process will be the same. I am creating a text input but you can have a different type of field. Like, the type attribute represents the type of our input field. When we add a field in our HTML file, we also add some attributes to it. How to Get The Value From Text Input Using JavaScript But you are free to use any of the methods discussed below. I will also try to explain which is the most optimal way for us in most cases. That's why it is important to know different ways to collect values from HTML input fields using JavaScript. The main purpose of using HTML input fields is to collect information from users and utilize them in the application. When one of those occurs, it can trigger pretty much any action JavaScript is capable of performing.Store User Input in a Variable with JavaScript - Quick and Easy! The JavaScript events onkeydown, onkeyup, onclick, and onchange can all be used to make something happen when the user uses a form. "F:" (document.getElementById("onclickcheck").checked ? 'checked' : 'unchecked') "E:" (document.getElementById("onclickyes").checked ? 'Yes' : (document.getElementById("onclickno").checked ? 'No' : '') ) "\n" "D:" document.getElementById("onchange").value "\n" "B:" document.getElementById("onkeyup").value "\n" "A:" document.getElementById("onkeydown").value "\n" Var sel = document.getElementById("selectone") ĭocument.getElementById("eventlog").value = "" Here is the source code of the above interactive demonstration. The triggered action for the checkbox is the update of the textarea box at "F:" with either the word "checked" or "unchecked" depending on whether or not the checkbox is checked.Įach of the 4 events described in this article are recognized as events at different times. The triggered action for the radio button is the update of the textarea box at "E:" with the value of the checked item. As soon as the click happens, the event is triggered. This is especially useful for radio buttons and checkboxes. Onclick - The event is triggered when the field is clicked on. However, it will update only after the mouse is clicked somewhere outside the field. The triggered action is the update of the textarea box at "D:" with the content of the field. That's because so long as the field is in focus, the JavaScript doesn't know whether or not you are done typing. If used in a text field, the event will not be triggered until the mouse is clicked somewhere outside the field. The triggered action is the update of the textarea box at "C:" with the value of the selected item. As soon as a new selection is made, the event is triggered. ![]() This is especially useful for dropdown lists. Onchange - The event is triggered when a field has changed. ![]() The triggered action is the update of the textarea box at "B:" with the content of this field, including the character you just typed. The event is triggered after the character is typed into the form field. Onkeyup - As soon as the keyboard key is released, the event is triggered. Because the event is triggered before the character is typed, the character you are about to type is not included in the textarea box. The triggered action is the update of the textarea box at "A:" with the content of this field. The event is triggered before the character is typed into the form field.Įxample: onkeydown="AnEventHasOccurred()" Onkeydown - As soon as the keyboard key is pressed, the event is triggered.
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