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[client] Handle devices with no data gracefully

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This commit is contained in:
Starbeamrainbowlabs 2019-04-16 17:15:32 +01:00
parent 8ebb6539bc
commit 122d44f3b2
Signed by: sbrl
GPG key ID: 1BE5172E637709C2
1 changed files with 7 additions and 4 deletions
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11
client_src/js/DeviceReadingDisplay.mjs
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@ -101,10 +101,9 @@ class DeviceReadingDisplay {
// ---------------------------------------------------- // ----------------------------------------------------
this.reading_types = await this.fetch_reading_types(); this.reading_types = await this.fetch_reading_types();
this.reading_type = this.reading_types.find((type) => type.short_descr == default_reading_type); this.reading_type = this.reading_types.find((type) => type.short_descr == default_reading_type)
// Default to the 1st reading type if we can't find the default || this.reading_types[0] // Default to the 1st reading type if we can't find the default
if(typeof this.reading_type == "undefined") || { short_descr: "NONE_PRESENT", friendly_text: "(none yet!)", id: -1, count: -1 }; // ...or a default object if there aren't any readings yet
this.reading_type = this.reading_types[0];
// Create the reading type buttons // Create the reading type buttons
let reading_type_list = this.display.querySelector(".reading-types"); let reading_type_list = this.display.querySelector(".reading-types");
@ -261,6 +260,10 @@ class DeviceReadingDisplay {
} }
async get_data() { async get_data() {
// If there aren't any readings yet, then there's no point in requesting them
if(this.reading_type.id == -1)
return false;
let new_data = null; let new_data = null;
// Dividing by 1000: ms -> s // Dividing by 1000: ms -> s
let average_seconds = (this.end_time.diff(this.start_time) / 1000) / this.points_resolution; let average_seconds = (this.end_time.diff(this.start_time) / 1000) / this.points_resolution;