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JavaScript JavaScript and the DOM (Retiring) Traversing the DOM Child Traversal

Posted by Haardik Gupta
.a{fill-rule:evenodd;}techdegree
Haardik Gupta
Full Stack JavaScript Techdegree Student 5,459 Points

help js

Next, change the color of each child paragraph to blue.

(Remember: paragraphs is a collection of elements, so you'll first need to use a loop to access each element in the collection.)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ is the question my code is getting an error

app.js 
var section = document.querySelector('section');
var paragraphs = section.children;
for (let i = 0; i < paragraphs.length; i += 1) {
  color = "blue"(paragraphs[i]);
}
index.html 
<!DOCTYPE html>
<html>
    <head>
        <title>Child Traversal</title>
    </head>
    <body>
        <section>
            <p>This is the first paragraph</p>
            <p>This is a slightly longer, second paragraph</p>
            <p>Shorter, last paragraph</p>
        </section>
        <footer>
            <p>&copy; 2019</p> 
        </footer>
        <script src="app.js"></script>
    </body>
</html>

3 Answers

Steven Parker
Steven Parker
231,268 Points
Steven Parker
Steven Parker
231,268 Points

Your loop is good, but the assignment syntax needs some work:

  • the code to access the paragraph needs to be on the left side of the assignment.
  • the properties should be accessed on the paragraph element
  • only the color itself should be on the right side
  • "color" is a sub-property of the "style" property
Haardik Gupta
.a{fill-rule:evenodd;}techdegree
Haardik Gupta
Full Stack JavaScript Techdegree Student 5,459 Points

i updated the code to

var section = document.querySelector('section'); var paragraphs = section.children; for (let i = 0; i < paragraphs.length; i += 1) { paragraphs.style.color = "blue"(paragraphs[i]); }

and im geting the error

Bummer: Cannot read property '1' of null

Steven Parker
Steven Parker
231,268 Points
Steven Parker
Steven Parker
231,268 Points

You're missing the index on the left side of the assignment. And there should be nothing on the right side except for "blue".

Haardik Gupta
seal-mask
.a{fill-rule:evenodd;}techdegree
Haardik Gupta
Full Stack JavaScript Techdegree Student 5,459 Points
Haardik Gupta
.a{fill-rule:evenodd;}techdegree
Haardik Gupta
Full Stack JavaScript Techdegree Student 5,459 Points

i dont understand what you mean by left side and right side

Steven Parker
Steven Parker
231,268 Points
Steven Parker
Steven Parker
231,268 Points

In an assigment, the "=" is the assignment operator, the left side of it is where you put the thing that is being assigned, and the right side is where you put the value being given to it.

ā€ƒ this is the left side :point_left: ā€ƒ = ā€ƒ :point_right: this is the right side

Haardik Gupta
seal-mask
.a{fill-rule:evenodd;}techdegree
Haardik Gupta
Full Stack JavaScript Techdegree Student 5,459 Points
Haardik Gupta
.a{fill-rule:evenodd;}techdegree
Haardik Gupta
Full Stack JavaScript Techdegree Student 5,459 Points

Is this the index (paragraph[i]); ?

Steven Parker
Steven Parker
231,268 Points
Steven Parker
Steven Parker
231,268 Points

The index is the value in brackets :point_right: [i]