The d3.selection.filter() function in d3.js is used to filter the given selection and return a new selection for which the filter is true. The filter to be used may be a string or a function.
Syntax:
selection.filter(filter);
Parameters: This function accepts one parameter as mentioned above and described below:
- filter: It is a string or a function that would be used to filter a selection. The filter is applied to each selected element when using a function.
Return Values: This function returns the new selection.
Example 1: This example selects all the odd children of the specified element.
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content=
"width=device-width,initial-scale=1.0">
<script src=
</script>
<script src=
</script>
</head>
<body>
<div>
<b>1. This text is in bold</b>
<b>2. This text is also in bold</b>
<b>3. Geeks for geeks</b>
<b>4. Geeks for geeks</b>
<b>5. Geeks for geeks</b>
</div>
<script>
let selection = d3.selectAll("b")
.filter(":nth-child(odd)")
.nodes();
selection.forEach((e) => {
console.log(e.textContent)
})
</script>
</body>
</html>
|
Output:
Example 2: This example selects all the even children of the specified element.
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content=
"width=device-width,initial-scale=1.0">
<script src=
</script>
<script src=
</script>
</head>
<body>
<div>
<b>1. This text is in bold</b>
<b>2. This text is also in bold</b>
<b>3. Geeks</b>
<b>4. Geeks</b>
<b>5. Geeks for geeks</b>
</div>
<script>
let selection = d3.selectAll("b")
.filter(":nth-child(even)")
.nodes();
selection.forEach((e) => {
console.log(e.textContent)
})
</script>
</body>
</html>
|
Output:
Example 3: This example uses selection.selectAll as a filter.
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content=
"width=device-width, initial-scale=1.0">
<script src=
</script>
<script src=
</script>
</head>
<body>
<div>
<h3>1. This text is in bold</h3>
<h3>2. This text is also in bold</h3>
<h3>3. Geeks</h3>
<h3>4. Geeks</h3>
<h3>5. Geeks for geeks</h3>
</div>
<script>
// Using selection.selectAll with filter
let selection = d3.selectAll("div")
.selectAll("h3")
.filter(":nth-child(even)")
.nodes();
selection.forEach((e) => {
console.log(e.textContent)
})
</script>
</body>
</html>
|
Output:
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Last Updated :
19 Aug, 2020
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