Lotus Notes Xpages, How to get "Content-Range" in api document - xpages

Question

I have a url /{database}/api/data/collections/name/{name}.
How to get all entry of view {name} with getResponseHeader("Content-Range")?

Answer 1

SSJS
You can get all response header fields with HttpURLConnection's method getHeaderFields().
Pick your wanted header field with get('Content-Range').
Example:
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core">
<xp:text escape="true" id="computedField1">
<xp:this.value><![CDATA[#{javascript:
var url = new java.net.URL(
"http://yourServer/yourDatabase.nsf/api/data/collections/name/All");
var conn:java.net.HttpURLConnection = url.openConnection();
conn.setRequestProperty("Accept", "application/json");
if (conn.getResponseCode() == "200") {
try {
return conn.getHeaderFields().get('Content-Range');
} catch(e) {
return 'Error reading header field "Content-Range"';
}
} else {
return 'Error ' + conn.getResponseCode() + " " + conn.getResponseMessage();
}
}]]></xp:this.value>
</xp:text>
</xp:view>
This example XPage renders as result e.g. items 0-9/35 and indicates that the response includes entries 0 through 9 of a total of 35 entries.
If you want to get the total number of entries only then change the line
return conn.getHeaderFields().get('Content-Range');
to
var range = conn.getHeaderFields().get('Content-Range').get(0);
var total = range.substr(range.indexOf('/') + 1);
return total;
This will render for the same URL 35 only.
CSJS
Use XMLHttpRequest's method getResponseHeader() on client side:
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
xhr.send(null);
var range = xhr.getResponseHeader("Content-Range");
var total = range.substr(range.indexOf('/') + 1);
return total