Passing custom event function from parent component to child in react

 

Passing  function  from parent to child component 

for click-event customizing 

1) define function in app level

    function. custom_event (key, event) {

      // this is custom function 

      console.log ("call custom function ") ;

    }

2) passing custom function to child by property

     when click item ,  item calls internalClick

       custom_event function is called by name "customFunction" in internalClick function 

        

// in app.js     

  function. custom_event (key, event) {

      // this is custom function 

      console.log ("call custom function ") ;

    }

 <BoardList  customFunction= { this.props.custom_event }  />    

//  in BoardList.js

      // some loop ... 

     <BoardRow keyField={ this.props.keyField}   customFunction = { this.props.customFunction} /> 

//  in BoardRow.js 

     <BoardItem keyField={ this.props.keyField} customFunction = { this.props.customFunction} /> 

// in BoardItem.js 

     internalClick = (e) => {

       console.log ( "click item ") ;

       this.props.customFunction(this.props.keyField , e) ;

     }

    render() {

          return (<button  onClick = { this.internalClick } > click </button>)

    }

    

      

    

Python new string format (update) f-string

 Update .. 

Late news 

My previous post:  2016 

https://blog.boxstory.com/2016/08/python-new-string-format.html

New Addition  :  f-string   ( support  from 3.6 )

variable = 'hello'

print(f' my variable is {variable}') # using f' xxxx {variable_name}'

 # output 

my variable is hello 

# Yes , It's very simple and powerful. 

brew command list in mac OS

homepage: 

• site : https://brew.sh/ 
• full command list : https://docs.brew.sh/Manpage

Minimum command list

• Install
• brew install {programname}
• Start service 
• brew services start {program name}
• Stop service
• brew services stop {program name }
• List services
• brew services list
• Update brew itself
• brew update
• Upgrade program
• brew upgrade {program name }

License listing used in java project ( maven, gradle )

maven ( POM.xml)

• run task site,
• files are generated in
  • target/site/dependencies.html
  • target/site/project-info.html

<Project>
	<reporting>
	        <plugins>
	            <plugin> <!-- This plugin needs site plugin"  -->
	                <groupId>org.apache.maven.plugins</groupId>
	                <artifactId>maven-project-info-reports-plugin</artifactId>
	                <version>3.4.3</version>
	                <reportSets>
	                    <reportSet>
	                        <reports>
	                            <report>dependencies</report>
	                            <report>licenses</report>
	                        </reports>
	                    </reportSet>
	                </reportSets>
	            </plugin>
	        </plugins>
	    </reporting>
...

gradle (build.gradle)

• run task : generateLicenseReport
• file generated in
  • build/licenses/index.html
  • build/licenses.csv
  • build/index.xml

import com.github.jk1.license.render.*
//import com.github.jk1.license.importer.*

plugins {
	id 'java'
	id 'org.springframework.boot' version '3.0.6'
	id 'io.spring.dependency-management' version '1.1.0'
	id 'project-report'
	id 'com.github.jk1.dependency-license-report' version '2.1'

}

// ref : https://github.com/jk1/Gradle-License-Report
// run  generateLicenseReport
licenseReport {
	outputDir = "$projectDir/build/licenses"
	renderers = [new InventoryHtmlReportRenderer(),new XmlReportRenderer(), new CsvReportRenderer()]
}

Example code : Split PDF using PyPDF2 (python)

 

• Very simple example code
• ref : https://pypdf2.readthedocs.io/en/3.0.0/

* install 

  >> pip install PyPDF2 

*sample src: sample pdf has 38 pages.

12 files are generated and each file has three pages.

this code uses fixed file count number because I already know page count, 

but you can use "len(src_pdf.pages)" to get page count of source file.

from PyPDF2 import PdfFileReader, PdfFileWriter

src_pdf = PdfFileReader(open("./src.pdf'))

for file_index in range(12): # <= len(src_pdf.pages)/3

writer = PdfFileWriter()

for page_index in range(3):

writer.addPage(src_pdf.getPage(file_index*3+page_index+2))

writer.write(open("./out-{:02}.pdf".format(file_index), 'wb'))