D3.js selection.empty() Function
The d3.empty() function in D3.js is used to return a boolean value. The value is true when the selection contains no elements and it returns false when the selection is non-empty.
Syntax:
selection.empty();
Parameters: This function takes no parameters.
Return Values: This function returns a boolean value.
Below given are a few examples of the function given above.
Example 1:
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< meta name = "viewport"
path1tent=" width = device -width,
initial-scale = 1 .0">
< title >Document</ title >
</ head >
< style >
div{
background-color: green;
margin-bottom: 5px;
padding: 10px;
width: fit-content;
}
</ style >
< body >
< div >Some text</ div >
< div >Geeks for geeks</ div >
< div >Geeks for geeks</ div >
< div >Some text</ div >
< script src =
</ script >
< script src =
</ script >
< script >
let selection=d3.selectAll("div")
console.log(selection.empty())
</ script >
</ body >
</ html >
|
Output:
Example 2:
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< meta name = "viewport"
path1tent=" width = device -width,
initial-scale = 1 .0">
< title >Document</ title >
</ head >
< style >
div{
background-color: green;
margin-bottom: 5px;
padding: 10px;
width: fit-content;
}
</ style >
< body >
< div >Some text</ div >
< div >Geeks for geeks</ div >
< div >Geeks for geeks</ div >
< div >Some text</ div >
< script src =
</ script >
< script src =
</ script >
< script >
// Selection is empty because no
// container name h2 is rendered.
let selection=d3.selectAll("h2")
console.log(selection.empty())
</ script >
</ body >
</ html >
|
Output:
Last Updated :
14 Aug, 2020
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