I'm currently using Codeigniter to do basic CRUD. I have the following code
JS
function approve(args){
if(confirm('Do you want to approve this document?')){
window.location = "http://52.45.5.57/index.php/FinalizeCase/approve/" + args;
}else{
return false;
}
HTML with some PHP to loop all the PKs to generate something like this
<input type="submit" name="submit" value="Approve" onclick="approve(0000000004)"/>
<input type="submit" name="submit" value="Approve" onclick="approve(0000000008)"/>
But the weird this is, sometimes when I click the links I get really weird values i.e. for 15 I got 13. I thought maybe I mixed the loops or something and tried changing a cell to 215~ and when I tested it I got 140 even though my max cell and DB is around 15 excluding the one I raised for testing.
Checked the link params before clicking and it checked out with the corresponding value in the cell.
Tried using the following but it stayed the same, 251 becomes 141 and 12 becomes 8.
use a button instead of an input tag
use unique names and values in the html tag
Do you actually need the leading zeroes?
You're experiencing one of the disadvantages of loosely-typed languages such as php or JavaScript: the interpretor decides what type is each variable, not you. It saves work most of the time because "it just works" but sometimes the data type chosen by the interpreter is not what you'd expect and you end up here.
You may think your args are either strings or integers with a lot of leading zeroes, but the interpreters are actually seeing Octal numbers (which, when converted to decimal, change)
Depending on what is the actual type you expect, you have many alternatives:
If you expect the argument to be treated as a string, you need to keep the leading zeroes but prevent any interpretation as octal like this
function approve(args)
{
var a = String(args); // force the type to string
if(confirm('Do you want to approve this document?'))
{
window.location = "http://52.45.5.57/index.php/FinalizeCase/approve/" + a;
}
else
{
return false;
}
Just to be safe, you may also want to take the value in your controller and cast it as a string too. Assuming the args is also called $args in your PHP part, you may do something like
public function approve( (string) $args = null)
{
// Do whatever you need to do
}
This would also be my recommended course of action if your args are a zero-padded integer in the database.
If you need to considers args are strings, you should trim the leading zeroes and cast as int using parseInt(); in JavaScript and/or $args = (int) $args; in php
Like #Funk Forty Niner said.
The solution is simple, just remove the leading zeroes.
$str = ltrim($str, '0');
Related
I tried to create a JavaScript program that outputs the binary format of an English letter on input. I had to put the value in the code. How can the value be entered in the console when the program runs?
function returnBinaryLetter(char) {
return ((/^[a-z]$/).test(char)) ? char.charCodeAt(0).toString(2).padStart(8, '0') : 'Sorry, that is not a letter.'
}
// Something like:
// const input = consoleInputFunction('Enter a number.');
// console.log(returnBinaryLetter(input.toLowerCase()));
EDIT 1: This is not for a webpage. This is a JS program which I will run using Node.js. I require a solution with just JS, not with some framework (if that is even possible, mentioning just to be specific).
EDIT 2: I have made the code better after suggestions in Endothermic Dragon's answer.
To directly answer your question, you would use prompt to get a user input in this case.
However, you don't need all of that code. Try this:
function returnBinaryLetter(char) {
if ((/^[a-z]$/).test(char)) {
return char.charCodeAt(0).toString(2).padStart(8, '0')
} else {
return 'Sorry, that is not a letter.'
}
}
var input = prompt('Enter letter to be converted to binary:').toLowerCase();
console.log(returnBinaryLetter(input))
While it may seem a bit intimidating, here's the whole thing broken down:
Ask for an input using prompt, and convert it to lowercase.
Pass the character to the function returnBinaryLetter, and log the output.
Now for the function returnBinaryLetter:
Check if it is a single lowercase letter, using some RegEx.
If it is, return binary. Otherwise, return an error with a description.
Hmm, but how does the binary conversion work?
First, take the character and get its character code.
Next, convert that code to binary.
Finally, pad the start so it is an 8-bit number. If it is not 8 digits, add on 0s at the beginning until it is.
Here, you can see that a more dynamic conversion looks much shorter, and cleaner as well, compared to manually entering about 28 lines of code.
Bonus:
Surprise, surprise! You can further shorten it. Using a ternary operator, you can skip the if-else statement.
function returnBinaryLetter(char) {
return ((/^[a-z]$/).test(char)) ? char.charCodeAt(0).toString(2).padStart(8, '0') : 'Sorry, that is not a letter.'
}
var input = prompt('Enter letter to be converted to binary:').toLowerCase();
console.log(returnBinaryLetter(input))
Now, it's a one-liner!
A ternary operator is usually used within variables when you want to assign its value based on a condition. The ternary operator first checks if the condition inside the brackets is true, and if it is, it returns the first statement (between ? and :), and if not, it returns the second statement (after the :). Pairing this with the return statement of a function, you get a one-liner function!
Feedback:
Since it seems that you are following CamelCase, I thought I would mention that function names should always start with a capital letter, along with each word after that also starting with a capital letter. Variables are different however - for variables, you do make the first letter lowercase, but make all the other words uppercase. In addition, the function name returnBinaryLetter might seem intuitive to you, but not for anyone looking at the code. A more intuitive name that exactly describes its function would be LowercaseLetterToBinary.
For NodeJS, You can use inquirer, which provides different kinds of prompts for the command line (such as text, list, checkbox etc).
Prerequistes:
Install it with npm install inquirer
Example
const { prompt } = require("inquirer");
async main() {
const binaryLetter = await prompt({
type: 'input',
name: 'letter',
message: `What's your name >>`
})
.then(answer => returnBinaryLetter(answer['letter']));
}
main();
I got a variable Javascrpit which has a number as a string in this case 0.84. I'm trying to convert it into a float but when I try to it appears a 0 as float instead the 0.84.
I'm using this:
var pot="0.84";
var asd = parseFloat(pot);
console.log(asd);
EDIT:
This is not exactly the example. I recover data from the HTML and it works for other numbers but not for this. It is difficult to explain my problem exactly. It is a lot of code and works for other numbers so don't know exactly.
Your input is not "0.84". If you test with that, you will get the correct answer. Your input has something else inside, like spaces, for example:
"0 .84"
This should be the solution:
parseFloat(pod.replace(/ /g, ""))
I have tried this example on my end and it completely worked. However, you can try to instead input the string value directly into the parse float() function and it should print our your expected value. If you still want to assign the parsefloat() to a variable, then try to either rewrite the code or re-open your IDE because the code should work.
var pot = "0.84"
console.log(parseFloat(pot))
or you can just write it in one line
console.log(parseFloat("0.84"))
I've avoided asking this question here as I know many have in the past. I've spent some time during the last few days trying to find a solution/figure out how the toFixed() method works. I've read a lot of questions on this site and tutorials on others but I'm still not getting it.
I have several text fields with the class, ".entry". A dollar amount is supposed to go here. When people type the following (examples):
1.2
5
6.35
8.
I need them to change to:
1.20
5.00
6.35
8.00
In other words, add the trailing zeros. I know this is accomplished through the toFixed() method but I'm completely at a loss. I can't get it to work.
I have a script I found that totals all the text fields in a DIV elsewhere on the page and I notice that it uses the toFixed() method:
$("#total").html(sum.toFixed(2).replace(/(^\d{1,3}|\d{3})(?=(?:\d{3})+(?:$|\.))/g, '$1,'));
}
I tried using that same code here so the zeros could display in the text field:
$('.entry').keyup(function(){
var str = this.value.replace(/(^\d{1,3}|\d{3})(?=(?:\d{3})+(?:$|\.))/g, '$1');
if (str!=this.value) this.value = str;
});
It doesn't work.
I'm new to Jquery and Javascript so I realize I'm probably missing something obvious. Most of the tutorials I've read set the variable in the code and then use "document.write" to display the variable with the correct number of zeros:
Example:
document.write( 1.1.toFixed(2) + '<br>' );
But this isn't what I'm looking for. I need it to show up in the text field.
Thanks in advance!
A few things:
Use the change event instead of keyup. If you use keyup, the text wil change every time the user tries to type something, which is an annoying user experience.
Consider using an input of type number with a step of 0.1.
With those in mind, I'd do something like this:
$('.entry').change(function(){
// parse the typed value as a floating point number
var num = parseFloat(this.value);
// ensure there are two decimal places
this.value = num.toFixed(2);
});
Note that if the user types something with more than two decimal places, the value will be rounded.
Example: http://jsfiddle.net/jndt1e02/
I have an equation/formula stored in database and I want it to be triggered based on key up input event in a webpage.
Example formula: [55-57]
This is a simple minus operation, where the number actually represents the id of a row in database
I have looked at this solution which replaces numbers found in a string to new value. But I need the new value to be replaced with incremented letters such as a, b and so on. Also the leading and ending brackets [] need to be removed so that I can perform an eval later using JavaScript.
Later the equation will be convert to a-b. Variable a and b represent other HTML elements that holds a value. So whenever I key in something into text field, changes will reflect on other part of webpage. It's like auto computation.
Thank you for those helping this. Hope this question will help somebody.
Try something like this. If you need more help, you seriously need to re-word your question or post a jsfiddle, or something.
var eqn = '55-57'; // brackets removed. Remove them with a regex of /\[|\]/g if you need to
var result = eval( eqn.replace( /\w+/g, function( res ){
return +document.getElementById( res[1] );
} );
Basically this replaces 55 and 57 with the numerical values of #55 and #57. It would also work for #b, etc.
It then eval's the result, basically doing whatever math is in your equation.
I got a piece of code like this:
var password = eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1;};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p;}('9 5$=["\\8\\3\\4\\3\\2\\2\\1\\3\\2\\3\\3\\2\\2\\7\\3\\1\\4\\1\\3\\2\\1\\3\\1\\3\\2\\2\\2\\1\\3\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\2\\1\\3\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\2\\1\\3\\1\\3\\2\\2"];6 c(){e["\\f\\g\\d\\a\\b"](5$[0])}',17,17,'|x2b|x5d|x5b|x21|_|function|x29|x28|var|x72|x74|O0|x65|window|x61|x6c'.split('|'),0,{}));
And I unpacked the following code(except 'var password = '):
eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1;};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p;}('9 5$=["\\8\\3\\4\\3\\2\\2\\1\\3\\2\\3\\3\\2\\2\\7\\3\\1\\4\\1\\3\\2\\1\\3\\1\\3\\2\\2\\2\\1\\3\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\2\\1\\3\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\1\\4\\1\\3\\2\\2\\1\\3\\1\\3\\2\\2"];6 c(){e["\\f\\g\\d\\a\\b"](5$[0])}',17,17,'|x2b|x5d|x5b|x21|_|function|x29|x28|var|x72|x74|O0|x65|window|x61|x6c'.split('|'),0,{}));
Then I got:
var _$ = ["\x28\x5b\x21\x5b\x5d\x5d\x2b\x5b\x5d\x5b\x5b\x5d\x5d\x29\x5b\x2b\x21\x2b\x5b\x5d\x2b\x5b\x2b\x5b\x5d\x5d\x5d\x2b\x5b\x21\x2b\x5b\x5d\x2b\x21\x2b\x5b\x5d\x2b\x21\x2b\x5b\x5d\x5d\x2b\x5b\x21\x2b\x5b\x5d\x2b\x21\x2b\x5b\x5d\x2b\x21\x2b\x5b\x5d\x2b\x21\x2b\x5b\x5d\x2b\x21\x2b\x5b\x5d\x2b\x21\x2b\x5b\x5d\x5d\x2b\x5b\x2b\x5b\x5d\x5d"];
function O0() {
window["\x61\x6c\x65\x72\x74"](_$[0])
}
And after decoding:
var _$ = ["([![]]+[][[]])[+!+[]+[+[]]]+[!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[+[]]"];
function O0() {
window["alert"](_$[0])
}
Now I wonder how the codes execute and what is the value of password ?
Thanks so much.
The code is obfuscated and intended to permit execution of arbitrary code even if the script text is passed through filters.
The approach is often used for tracking, phishing and other undesirable activities, so I would suggest you don't try running it.
All you need to do is run this code -- not the 'window' stuff, but only the 'decode' part -- and you'll see the solution.
Here are some pointers on decoding:
the outer array brackets are a decoy
an empty array [] evaluates to 0 when used in a calculation such as +[]
!0 = 1
!+0 evaluates to true or 1, !+1 to false or 0 (this surely must be a loophole in Javascript)
.. so !+[] is simply 1.
[1]+[1] is not a valid math sum, so both arrays are converted to strings before being added up.
The above takes care of the numbers. Where does the first character come from? The first part ([![]]+[][[]]) evaluates directly to a string two constants, which add together as a string again, and the array index after it picks up a single character.