Add code samples for markers and pagination.

content/_code-samples/markers-and-pagination/js/pagination-with-markers.js

@@ -0,0 +1,40 @@
+const xrpl = require("xrpl")
+
+async function main() {
+
+  // Create client and connect to network.
+  const client = new xrpl.Client("wss://xrplcluster.com/")
+  await client.connect()
+
+  // Query ledger data.
+  let ledger = await client.request({
+    "command": "ledger_data",
+    "ledger_index": 500000,
+  })
+
+  // Create function to loop through API calls.
+  function code(){
+    console.log(ledger["result"])
+  }
+ 
+  // Run code at least once before checking for markers.
+  do {
+    code()
+    
+    if (ledger["result"]["marker"] == null) {
+        break
+    }
+
+    const ledger_marker = await client.request({
+        "command": "ledger_data",
+        "ledger_index": 500000,
+        "marker": ledger["result"]["marker"]
+    })
+    ledger = ledger_marker
+
+  } while (true)
+
+  client.disconnect()
+}
+
+main()