嵌套影子根中的查询元素

Question

Scenerio : In my application I have nested shadow-roots , and I want to get an element in the inner shadow-root from outer shadow-root .

What I actually mean is that consider this scenerio.

<Component 1 id="headerComponent">
#shadow-root // outer shadow-root.
  <div class="header"></div> // element in outer shadow-root.
  #shadow-root // inner shadow-root.
    <Component 2 id="titleComponent"> // We have component 2 inside the shadow root of component 1.
       <input class="titleInput"> // element inside inner shadow-root.

Now, If I am in Component 1.js and want to Query any element in Component 1.js , I will write this block of code this.shadowRoot.querySelector('.header'); , and it works well.

But, If I am in Component 1.js and want to Query an element( here it is <input> with class titleInput ) in Component 2.js , How can I do it?

Trying the similar statement like this.shadowRoot.querySelector('.titleInput'); doesn't seems to work and returns null .

Answer 1

I managed to solve the problem. Here is the snippet of js that will do the magic.

this.$.titleComponent.shadowRoot.querySelector('.input-wrap');

For those who are not familier with polymer architecture.

Here, As I am in Component 1 . So, this refers to component 1(Component 1 class methods, properties and this.$ is used to select elements inside Component 1 class template having the id followed by this.$.elementID), this.$.titleComponent selects titleComponent and this statement selects the element shadowRoot.querySelector('.input-wrap') .