


Share two methods of dynamically passing values from Vue parent components to child components
In some project requirements, the parent component needs to dynamically transfer values to the child component. For example, my requirement here is that the parent component dynamically obtains the returned image url array through axios and then passes it to the child component. The child component that uploads the image gets the After the array is traversed and the picture is displayed. This article mainly introduces two methods for dynamically transferring values from Vue parent components to child components. Friends who need it can refer to it. I hope it can help everyone.
There are two methods,
Method 1:
props pass value, pay attention to a problem here, the passed value needs to be monitored and assigned with watch, otherwise it will be obtained here is an empty array
Parent component:
<uploadimg></uploadimg>
this.productImage=res.data.cover;
Here, assign the array returned through the background to
this.productImage, and then pass the array to the props defined by the child component Attribute src-list
Subcomponent:
watch:{ srcList(curVal,oldVal){ if(curVal){ ; this.uploadImg=curVal; } }, }
Then the subcomponent successfully obtains the array
Method 2:
Through the ref attribute, the parent component calls The method of the subcomponent passes the array to be passed as a parameter to the subcomponent. The subcomponent gets the parameter and uses
Parent component:
this.$refs.productImage.getSrcList(res.data.cover);
Child component:
getSrcList(val){ this.uploadImg=val; }
PS: Let’s look at the vuejs dynamic component passing data to the sub-component
The props when the sub-component is defined can support the parent component to pass data to the sub-component. These defined props are bound in the tag of the sub-component. Attributes are enough, but if you are using a
<p> <component></component> </p>
The function of the component is independent. The function of the component is independent. If you want to obtain data from the component, you need to pass it layer by layer. That is to say, the child component can only obtain data from the direct parent component. , if it is the data of the root component, then the parent component must continue to expose pops to bind the data from the root component.
Related recommendations:
Sharing the simple implementation method of page reverse value transfer in vueValue transfer problem of VUE2.0 componentIntroduction to the method of passing values in phpThe above is the detailed content of Share two methods of dynamically passing values from Vue parent components to child components. For more information, please follow other related articles on the PHP Chinese website!

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Dreamweaver Mac version
Visual web development tools

Dreamweaver CS6
Visual web development tools