variables

getting error when exporting variable in reactjs

由 瘦欲@ 提交于 2020-12-13 07:31:15
问题 hello i have this component in react js : import React from 'react'; import './Questions.css'; const Questions = (props) => { let questions = Object.keys(props.slices).map((questionKey, i) => ( <li key={i}> <p>{props.slices[questionKey].question}</p> <div className="Answer"> <input onChange={props.selectScore(questionKey)} type="range" min="1" max="10" value={props.slices[questionKey].transform === '1' ? '10' : props.slices[questionKey].transform.replace('0.','')} className="rangeInput" style

How to store sum(field_name) in a variable within MySql Select statement?

由 喜你入骨 提交于 2020-12-06 13:15:25
问题 I am trying to store the sum total of a particular field in a variable like @data := sum(field_name) within MySQL Select statement. Below is an exact example of my query: SELECT a.id, @data1:=sum(b.amount) amount, @data1 as returned_val FROM tbl_table1 a LEFT JOIN tbl_table2 b ON b.acount_id=a.id GROUP BY a.id Notice that I store the sum(b.amount) to a variable @data1 and tried to display it in another row but never work as what I'm expecting. Is there any other way doing this? 来源： https:/

bash forgets export variable

由 青春壹個敷衍的年華 提交于 2020-12-06 07:21:40
问题 I am unable to make even the simplest export of variables, from within scripts, to work in my bash - what am I dooing wrong? File test.sh : #!/bin/bash echo $ttt ttt="fffalse" export ttt echo $ttt bash test : hpek@hpek:~/temp$ export ttt="tttrue" hpek@hpek:~/temp$ ./test.sh tttrue fffalse hpek@hpek:~/temp$ ./test.sh tttrue fffalse hpek@hpek:~/temp$ Edit: I now know from the answers, that this will not work. -but how can make a single variable remembered between processes? Do I need to store

bash forgets export variable

由 橙三吉。 提交于 2020-12-06 07:21:22
问题 I am unable to make even the simplest export of variables, from within scripts, to work in my bash - what am I dooing wrong? File test.sh : #!/bin/bash echo $ttt ttt="fffalse" export ttt echo $ttt bash test : hpek@hpek:~/temp$ export ttt="tttrue" hpek@hpek:~/temp$ ./test.sh tttrue fffalse hpek@hpek:~/temp$ ./test.sh tttrue fffalse hpek@hpek:~/temp$ Edit: I now know from the answers, that this will not work. -but how can make a single variable remembered between processes? Do I need to store

Why is document.getElementById not needed? [duplicate]

由 巧了我就是萌 提交于 2020-12-01 01:46:10
问题 This question already has answers here : Do DOM tree elements with ids become global variables? (5 answers) Closed 6 years ago . 1) Question 1 The following example works without using "document.getElementById('myId')". Why is that and is it OK to skip "document.getElementById('myId')"? <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Javascript question</title> <script> window.onload = function(){ myId.style.color = 'red'; } </script> </head> <body> <div id=myId> <p>Make this

“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP

由 我只是一个虾纸丫 提交于 2020-11-29 19:49:30
问题 I'm running a PHP script and continue to receive errors like: Notice: Undefined variable: my_variable_name in C:\wamp\www\mypath\index.php on line 10 Notice: Undefined index: my_index C:\wamp\www\mypath\index.php on line 11 Line 10 and 11 looks like this: echo "My variable value is: " . $my_variable_name; echo "My index value is: " . $my_array["my_index"]; What is the meaning of these error messages? Why do they appear all of a sudden? I used to use this script for years and I've never had

Changing variable name in Spyder

由 时光总嘲笑我的痴心妄想 提交于 2020-11-26 10:27:12
问题 I have a program with many formulas and variables. I need to change the name of some of these variables. Is there any command or function in Spyder that can help me change all the names in one step? I am looking for something like the Matlab's MAIUSC+ENTER. 回答1: 1) Select the variable you want to change, then Press CTRL + R 2) Enter the new variable name you want. (in replace by) 3) Replace all 回答2: No way to do it currently. It's an open issue. https://github.com/spyder-ide/spyder/issues/415

Changing variable name in Spyder

由 送分小仙女□ 提交于 2020-11-26 10:24:12
问题 I have a program with many formulas and variables. I need to change the name of some of these variables. Is there any command or function in Spyder that can help me change all the names in one step? I am looking for something like the Matlab's MAIUSC+ENTER. 回答1: 1) Select the variable you want to change, then Press CTRL + R 2) Enter the new variable name you want. (in replace by) 3) Replace all 回答2: No way to do it currently. It's an open issue. https://github.com/spyder-ide/spyder/issues/415

extern and global in c

由 蓝咒 提交于 2020-11-26 10:03:50
问题 Can anyone please tell me is there any special requirement to use either EXTERN or GLOBAL variables in a C program? I do not see any difference in a program like below, if I change from gloabl to extern. #include <stdio.h> #include <stdlib.h> int myGlobalvar = 10; int main(int argc, char *argv[]) { int myFunc(int); int i; i = 12; myGlobalvar = 100; printf("Value of myGlobalvar is %d , i = %d\n", myGlobalvar, i); i = myFunc(10); printf("Value of passed value : %d\n",i); printf("again Value of

extern and global in c

由 不羁岁月 提交于 2020-11-26 09:59:10
问题 Can anyone please tell me is there any special requirement to use either EXTERN or GLOBAL variables in a C program? I do not see any difference in a program like below, if I change from gloabl to extern. #include <stdio.h> #include <stdlib.h> int myGlobalvar = 10; int main(int argc, char *argv[]) { int myFunc(int); int i; i = 12; myGlobalvar = 100; printf("Value of myGlobalvar is %d , i = %d\n", myGlobalvar, i); i = myFunc(10); printf("Value of passed value : %d\n",i); printf("again Value of
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