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HTML

              
                ### Interaction

<form action="https://cosmic.link">
  <input name="type" type="hidden" value="manageBuyOffer">
  
  <fieldset><legend>#network</legend>
    <input name="network" value="test" readonly>
  </fieldset>
  
  <fieldset><legend>#buying</legend>
    <input name="buying" value="GILS:gils*cosmic.plus" readonly>
  </fieldset>
  
  <fieldset><legend>#price</legend>
    <input name="price" value="20" readonly>
  </fieldset>
  
  <fieldset><legend>#buyAmount</legend>
    <input name="buyAmount" type="number" min="0" step="1" required>
  </fieldset>
  
  <fieldset><legend>#submit</legend>
    <input id="submit" type="submit" value="Submit">
  </fieldset>

</form>
  

### Description

This pen shows how to make an HTML-only widget that buys a token on the distributed exchange. It uses the CosmicLink protocol.

### Concepts

- [Distributed Exchange](https://www.stellar.org/developers/guides/concepts/exchange.html): The decentralized currency exchange embedded into the Stellar protocol.
- [CosmicLink](https://cosmic.plus/#view:js-cosmic-lib/#what-are-cosmiclinks): A protocol that encodes Stellar transactions into URIs.
- [GILS](https://codepen.io/cosmic-plus/full/eYOeoWZ): An asset that rewards people who solve Pen of the Week challenges.

### Keypoints

- The CosmicLink protocol has initially been designed for this exact purpose.
- `GILS:gils*cosmic.plus` means the asset `GILS` emitted by the account `gils*cosmic.plus`.
- You can validate the transaction on testnet by clicking on "Submit" => "Go to Stellar Authenticator" => "Guest Mode" => "Sign & Send".
- For the transaction to succeed, you'll need to [open a trustline](https://codepen.io/cosmic-plus/pen/QWLQLBG?editors=1010#0) first.

### Challenges

- **easy/** Edit this pen to let the user select a network and an asset among a predefined list. Let her pick the price as well.
- **hard/** Add buy-sell radio buttons to let the user choose the trade direction. Make sure to update #price when switching. You'll need to use JavaScript.

_Give it a try by editing the code, and be the first to post a solution on GalacticTalk!_

### Documentation

- [CosmicLink Specifications](https://cosmic.plus/#view:js-cosmic-lib/web/doc/tutorial-10-specs-query.html)
- [List of Operations](https://www.stellar.org/developers/guides/concepts/list-of-operations.html)
- [Stellar Laboratory account viewer](https://www.stellar.org/laboratory/#explorer?resource=accounts&endpoint=single&network=test)

### Social

- [Discuss that pen on GalacticTalk](https://galactictalk.org/d/2141-pen-of-the-week-html-only-sell-token-form)
              
            
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CSS

              
                
              
            
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JS

              
                // Helpers for the hard challenge
const $ = document.querySelector.bind(document)

              
            
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999px

Console