Error NG0900 An error occurred while trying to compare. Only arrays and iterable objects allowed

Using *ngFor I am able to render the data but it throws this error Error: NG0900: An error occurred while trying to compare '[objectObject]'. Only arrays and iterable objects are allowed This is my service method asyncgetEditions():Promise<Observable<Cigales>>{returnthis.http.get<Ciga...

P粉226667290 2024-02-25 19:15:04 0  1  467

javascript - What is the role of weak set in ES6?

Weak set is not iterable and cannot use for-of, keys(), values(), forEach() to traverse values. So what is its function? Is it just about storing objects?

某草草 2017-05-19 10:43:42 0  1  557

javascript - Vue.js uses functions to operate properties of objects in data without triggering updates

I encountered this problem when learning the Vue.js framework. In the object iteration part of list rendering, I put an object object in the data and a button element in the li element to delete the attributes corresponding to the iteration, but after clicking the button , the corresponding attribut...

淡淡烟草味 2017-05-18 10:46:34 0  1  494

A usage in python is unclear

In the process of writing a crawler in Python (crawling Wikipedia entries), the url["href"] appeared during the output process of using the iterator. I thought it should belong to a usage in the iterator, but I couldn't find it. Please help me with this usage. I mean, thank you for the url...

阿神 2017-05-18 10:59:46 0  1  789

React error: Item is not iterable when adding to state

I'm currently trying to use the spread operator to push items into an array in React, but I'm getting the following error. The error occurs in the PhotoUploader component within PlacesForm.jsx. I've included the code into the component below. PlacesForm.jsx: importaxiosfrom'axios'importReact,{useEff...

P粉709644700 2024-03-27 17:49:53 0  1  486

Display value of HTML range slider using JS

The JS for displaying HTML range slider values ​​works fine for the first item (A1). However, I also want to use it for A2 projects (actually there are 20 projects, so it needs to be reused 19 times). Is there a way to code for multiple iterations? constslideValue=document.querySelector("span&q...

P粉988025835 2023-09-13 00:42:58 0  1  616

Using TensorFlow to create a logistic regression model training results are nan

In TensorFlow, I want to create a logistic regression model with the following cost function: The screenshot of the data set used is as follows: My code is as follows: {code...} The screenshot of the running result is as follows: As you can see, after iterating twice, we get Both W and b have become...

代言 2017-06-28 09:23:45 0  1  1115

javascript - How does JQuery get the ID of the current element through the dot mark button (how to get the ID of dynamic data)

1. The image in the picture and the candidate information displayed are all iterated by DataList. The purpose is to obtain the corresponding examination time, subject code and other information by clicking the mark button. To achieve this, click the mark button to send the current candidate's inform...

PHP中文网 2017-05-19 10:18:00 0  2  768

javascript - Urgent! Waiting online! Problem with linkage display of checkbox list?

{code...} {code...} [ {code...} ]; {code...} [ {code...} ]; Note: The parentId in array b corresponds to the id in array a. Now When you click an item in the A checkbox list, the B checkbox list will display the record corresponding to the parentId based on the id value checked in the A checkbox lis...

代言 2017-06-26 10:50:20 0  3  882

Reverse proxy - nginx acts as a secondary proxy

For example: There is an HTTP proxy server A (10.0.0.1/24, 192.168.0.1/24) and a Web server B (192.168.0.2/24). Machine C (10.0.0.3/24) can access the website on B by setting A as a proxy. Machine C has a public IP. Now there are only adjustments to C...

为情所困 2017-05-16 17:24:41 0  1  770

How to find JSON data based on other content in a JSON object when duplicates exist?

I'm currently implementing some data charts on a website, and I have a JSON that contains some data, specifically some ID numbers, some dates, and some data points. Because I have multiple dates under the same ID, I'm looking for a way to do essentially "find a JSON object with this ID and mont...

P粉713846879 2024-04-04 10:57:45 0  1  557

Is it possible for the code to skip an iteration in web scraping? IndexError: popup index out of range

So I have a code that removes the name + price of a mineral from 14 pages (so far) and saves it to a .txt file. I first tried using only Page1, then I wanted to add more pages to get more data. But then the code grabs something it shouldn't - random names/strings. I didn't expect it to grab that one...

P粉846294303 2024-02-21 19:40:15 0  2  426

php - Anonymous function return value problem

{Code...} {Code...} My question is whether passing in any object converts the closure object into the original object? Why is this happening? I asked in /a/11... Why do I pass in any object? Enter ($this) to retrieve the original object.

phpcn_u1582 2017-05-16 12:02:57 0  2  640

How to insert data in laravel?

Unresolved: Table Users table UserProfiles Users is hasOne relationship to UserProfiles {code...} UserProfiles is belongsTo relationship to Users {code...} How to write $user directly when a new $user = new Users(); is created The properties can reach sa...

phpcn_u1582 2017-05-16 16:55:17 0  1  935

typescript object literal type definition

I want to use typescript to define an object. The object can have any properties, but when accessing the properties, an error will be reported, showing that Property "a" does not exist on type Object. Is there a way to define such an object? {code...}

为情所困 2017-07-05 11:07:22 0  2  1118