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Merge branch 'custom-at' into 'v3'

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Custom `from_index()` function in webapp for backwards compatibility before javascrpt `at()`

Closes #396

See merge request openflexure/openflexure-microscope-server!280
This commit is contained in:
Julian Stirling 2025-06-06 12:00:05 +00:00
commit 60b2fda385
1 changed files with 22 additions and 2 deletions
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24
webapp/src/components/labThingsComponents/actionButton.vue
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@ -171,6 +171,26 @@ export default {
},
mounted() {
//Define .from_index() as a custom function, working similar to .at()
//For backwards compatibility, not using in-built .at() until updates to Connect
function from_index(n) {
// ToInteger() abstract op
n = Math.trunc(n) || 0;
// Allow negative indexing from the end
if (n < 0) n += this.length;
// OOB access is guaranteed to return undefined
if (n < 0 || n >= this.length) return undefined;
// Otherwise, this is just normal property access
return this[n];
}
const TypedArray = Reflect.getPrototypeOf(Int8Array);
for (const C of [Array, String, TypedArray]) {
Object.defineProperty(C.prototype, "from_index",
{ value: from_index,
writable: true,
enumerable: false,
configurable: true });
}
// Check for already running tasks
if (this.taskStarted != true) {
this.checkExistingTasks();
@ -299,14 +319,14 @@ export default {
if (!this.progress) this.progress = 1;
// Test whether the log is empty or the most recent message is not from an error
// If so, return a default message
if (response.data.log.length == 0 | response.data.log.at(-1).levelname != "ERROR") {
if (response.data.log.length == 0 | response.data.log.from_index(-1).levelname != "ERROR") {
var message = "Unexpected error, please check the logs";
}
// As LabThings Actions add the message from any raised exception to the log, the
// last message in the log is the message from the Exception.
//If the Exception was raised with no message, use a default.
else {
message = response.data.log.at(-1).message||"Unexpected error, please check the logs";
message = response.data.log.from_index(-1).message||"Unexpected error, please check the logs";
}
// Raise an Error with the chosen message
reject(new Error(message));