D3.js selection.on() Function
Last Updated :
13 Aug, 2020
The d3.selection.on() function in D3.js is used to add a particular event listener to an element. An event may be a string of event type click, mouseover, etc.
Syntax:
selection.on(typenames[, listener[, options]])
Parameters: This function accepts two parameters as mentioned above and described below:
- Typename Listener: It is a string event type such as click, submits, etc.
- Options: This is an optional object that may tell about the special characteristics of the listener.
Note: If a listener is not specified then it returns the currently assigned event for the particular element.
Return Values: This function returns the object.
Below examples illustrate the D3.js selection.on() function in JavaScript:
Example1:
HTML
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" />
< meta
name = "viewport"
path1tent=" width = device -width,
initial-scale = 1 .0"/>
< title >D3.js selection.on() Function</ title >
</ head >
< style >
li {
background-color: green;
color: #ffffff;
width: 50px;
margin-bottom: 5px;
padding: 20px;
height: 40px;
}
li:hover {
cursor: pointer;
opacity: 0.8;
}
</ style >
< body >
< ul >
< li >Geeks for geeks</ li >
< li >GEEKS FOR GEEKS</ li >
</ ul >
< script src =
</ script >
< script src =
</ script >
< script >
let li = d3.select("li");
let x = li.on("click", () => {
console.log("Clicked");
});
</ script >
</ body >
</ html >
|
Output:
Before clicking on the box:
After clicking on the box:
Example 2:
HTML
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" />
< meta
name = "viewport"
path1tent=" width = device -width,
initial-scale = 1 .0"/>
< title >D3.js selection.on() Function</ title >
</ head >
< style >
li {
background-color: green;
color: #ffffff;
width: 100px;
margin-bottom: 5px;
padding: 20px;
height: 50px;
}
li:hover {
cursor: pointer;
opacity: 0.8;
}
</ style >
< body >
< ul >
< li >Geeks for geeks</ li >
</ ul >
< script src =
</ script >
< script src =
</ script >
< script >
let li = d3.select("li");
let x = li.on("mouseover", () => {
let li = document.querySelector("li");
li.innerHTML = "mouseOver event";
});
// When cursor moves out of the li tag
x = li.on("mouseout", () => {
let li = document.querySelector("li");
li.innerHTML = "Geeks for geeks";
});
</ script >
</ body >
</ html >
|
Output:
On mouseover:
On mouseout:
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