![]() ![]() Var tp1 = document.getElementById("secondname") į. = "10px solid green" Var tp = document.getElementById("firstname") Ĭhanging the Borders of Input Box after filling the Box In the below example, we change the first Input box borders after filling the box to "10px solid green" and the second box borders to "3px dotted red" using JavaScript. If the value is present and it is not null, then border bottom will be changed to the dotted green color. ![]() Step 5 − Whenever the user adds some value to the input value, the onchange event is triggered and when event is triggered the value checks whether it is null or not. Step 4 − The style.border is the HTML DOM background property uses to change the elements of the bottom border. Step 3 − In JavaScript section, onchange event is declared which occurs when the value of the element is changed. ![]() Step 2 − The script code is defined where functionality of changing the borders of input box after filling the box. Step 1 − Define form element, which contains the input fields of text and button type. ![]() We should follow the below-given steps to change input box borders after filling the box − The style border returns a value of the string, which represents the color, width, and style of the border of the element. Inherit – It is used to inherit the properties from the parent element. Initial – Used to set the property to default value. We can pass style value as 'solid', 'dotted', 'double', etc. We can pass width value as 'thick', 'thin', 'medium' or value in px (i.e., 10px). The following is the syntax for the style.border property for changing the input box borders after filling the box − = "width style color|initial|inherit" In this article, we will see how we can change the Input box borders after filling the box using JavaScript. But oninput event occurs immediately after value of the element is changed, on the other hand onchange event occurs when the element loses its focus. The onchange event is quite similar to the oninput event. The onchange event can also work with the HTML element. It also works with the radio buttons and checkboxes, when the checked state is changed. The onchange is one of the JavaScript attribute and it occurs when the value of an HTML element is changed. We use onchange event to make changes effective after filling the box. It is one of the HTML Style Object properties. So, it should avoid overusing this method because it stops the user from accessing the other parts of the webpage until the box is closed.The style.border property is used to change the element’s border, and it returns the three border-bottom properties, i.e., border-color, border-style, and border-width of the element. The prompt box takes the focus and forces the user to read the specified message. Otherwise, it returns null on clicking "Cancel". When the user clicks "OK," the box returns the input value. It returns null or the string entered by the user. The prompt box consists of two buttons, OK and Cancel. The box is displayed using the prompt() method, which takes two arguments: The first argument is the label which displays in the text box, and the second argument is the default string, which displays in the textbox. When the prompt box pops up, we have to click "OK" or "Cancel" to proceed. It can be written without using the window prefix. It is generally used to take the input from the user before entering the page. The prompt() method in JavaScript is used to display a prompt box that prompts the user for the input. Next → ← prev JavaScript prompt() dialog box ![]()
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