Javascript is a very important language when it comes to learning how the browser works. Often there are times we would like to add dynamic elements/content to our web pages. This post deals with all of that.
Creation of new element: New elements can be created in JS by using the createElement() method.
Syntax:
document.createElement("<tagName>"); // Where <tagName> can be any HTML // tagName like div, ul, button, etc. // newDiv element has been created For Eg: let newDiv = document.createElement("div");
Once the element has been created, let’s move on to the setting of attributes of the newly created element.
Setting the attributes of the created element: Attributes can be set using setAttribute() method.
The syntax and example are as follows:
Element.setAttribute(name, value); // Where Element is the name of web element. // Here, we have created newDiv. // Where name is the attribute name and // value is the value that needs to be set For Eg: newDiv.setAttribute("class","container");
Example: Elements can be created based on some event like a click. Here’s an example of how to create elements dynamically with an onclick event. This code can be further made into a todo-list!
<!DOCTYPE html> < html lang = "en" >
< head >
< meta charset = "UTF-8" >
< meta http-equiv = "X-UA-Compatible" content = "IE=edge" >
< meta name = "viewport" content =
"width=device-width, initial-scale=1.0" >
< style >
html,
body {
height: 100%;
width: 100%;
}
.button {
display: flex;
align-items: center;
justify-content: center;
}
.tasks {
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
margin-top: 20px;
}
</ style >
</ head >
< body >
< div class = "button" >
< button id = "addTask" >Add task</ button >
</ div >
< div class = "tasks" ></ div >
< script type = "text/javascript" >
// Getting the parent element in which
// the new div will be created
let task = document.getElementsByClassName("tasks");
// Getting the addTask button element
let addTask = document.getElementById("addTask");
// Adding onclick event to the button
addTask.addEventListener('click', function () {
// Traversing through collection of HTML
// elements (tasks here)
for (let i = 0; i < task.length ; i++) {
// New div element is created
let newDiv = document .createElement("div");
// Setting the attribute of class type to newDiv
newDiv.setAttribute("class", "list");
// innerText used to write the text in newDiv
newDiv.innerText = "New Div created" ;
// Finally append the newDiv to the
// parent i.e. tasks
task[i].append(newDiv);
}
})
</script>
</ body >
</ html >
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Output: