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refactor: Extract message_fetch.get_backfill_anchor(). 

This is just moving code.
This commit is contained in:
Steve Howell 2018-03-21 11:03:03 -04:00 committed by Tim Abbott
parent 2a2df0ef5e
commit f524a095a2
1 changed files with 13 additions and 7 deletions
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20
static/js/message_fetch.js
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@ -148,12 +148,22 @@ exports.load_messages_for_narrow = function (opts) {
}); });
}; };
exports.get_backfill_anchor = function (msg_list) {
var oldest_message_id;
if (msg_list.first() === undefined) {
oldest_message_id = page_params.pointer;
} else {
oldest_message_id = msg_list.first().id;
}
return oldest_message_id;
};
exports.maybe_load_older_messages = function (opts) { exports.maybe_load_older_messages = function (opts) {
// This function gets called when you scroll to the top // This function gets called when you scroll to the top
// of your window, and you want to get messages older // of your window, and you want to get messages older
// than what the browers originally fetched. // than what the browers originally fetched.
var msg_list = opts.msg_list; var msg_list = opts.msg_list;
var oldest_message_id;
if (!msg_list.fetch_status.can_load_older_messages()) { if (!msg_list.fetch_status.can_load_older_messages()) {
// We may already be loading old messages or already // We may already be loading old messages or already
// got the oldest one. // got the oldest one.
@ -161,16 +171,12 @@ exports.maybe_load_older_messages = function (opts) {
} }
opts.show_loading(); opts.show_loading();
msg_list.fetch_status.start_older_batch(); msg_list.fetch_status.start_older_batch();
if (msg_list.first() === undefined) {
oldest_message_id = page_params.pointer;
} else {
oldest_message_id = msg_list.first().id;
}
var anchor = exports.get_backfill_anchor(msg_list).toFixed();
var batch_size = consts.backward_batch_size; var batch_size = consts.backward_batch_size;
exports.load_messages({ exports.load_messages({
anchor: oldest_message_id.toFixed(), anchor: anchor,
num_before: batch_size, num_before: batch_size,
num_after: 0, num_after: 0,
msg_list: msg_list, msg_list: msg_list,