Magento 2 order information: How to add links dynamically?

[Jens_Noma]

When a customer selects an order in his order history he is redirected to the order information page.

If the items have not yet been shipped there is only one tab available: Items ordered. If its shipped and invoiced two other tabs are available: Shipment and Invoice.

Where can I find the code responsible for showing and not showing the aforementioned tabs? I am asking because I want to create a custom tab and dynamically decide whether it should be shown or not.

[GauravMehta04]

@Jens_Noma Enable template path hints and check the respected files. Go on path to enable path hint - Stores > Configuration > Developer  options  from the Advanced tab at the end. 

set Enabled Template Path Hints for Storefront to yes

[Jens_Noma]

Unfortunatelly, I already did that but I was not able to find the piece of code responsible for that.

[Rakesh Jesadiya]

By default In Order history page of Customer dashboard,

All the dynamics links are handled by below layout XML from Sales Module,

sales_order_info_links.xml

All the links are managed by _toHtml() function from Link.php,

You can add/modify your new tab using above xml overriding in your custom theme or module level.

[Sunil Patel]

Hello,

Please check below XML for same

module-sales\view\frontend\layout\sales_order_guest_info_links.xml

 <block class="Magento\Sales\Block\Order\Link" name="sales.order.info.links.invoice">
                    <arguments>
                        <argument name="key" xsi:type="string">Invoices</argument>
                        <argument name="path" xsi:type="string">sales/guest/invoice</argument>
                        <argument name="label" xsi:type="string" translate="true">Invoices</argument>
                    </arguments>
                </block>

In that code

protected function _toHtml()
    {
        if ($this->hasKey()
            && method_exists($this->getOrder(), 'has' . $this->getKey())
            && !$this->getOrder()->{'has' . $this->getKey()}()
        ) {
            return '';
        }
        return parent::_toHtml();
    }

you need to do customize above method for that.

If it will help you then mark as a solution or give kudos.