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i get undefined result when i want to get the value from input box [closed]

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I want to get the value from the input in the html code and edit it, then put it in the div, but I get undefined.
HTML
<input type="text" id='doller'>
<button onclick="convertUsdToRiyal()">convert usd to Riyal</button>
<div id="result"></div>
<script src="js1.js"></script>
JS
function convertUsdToRiyal() {
'use strict';
var amount = document.getElementById('doller').Value,
result = 3.75 * amount,
massage = document.getElementById('result');
massage.innerHTML = amount;**//here i get undefined**
}

The "value" attribute should be in lower case, because javascript is a case sensitive language. So the instruction will be :
var amount = document.getElementById("doller").value.
Here is the code in es6 (ECMAscript 2015) for the convertUsdToRiyal() function:
convertUsdToRiyal = () => {
let amount = document.getElementById("doller").value;
result = 3.75 * amount;
massage = document.getElementById("result");
massage.innerHTML = result;
};
or just simply:
convertUsdToRiyal = () => {
document.getElementById("result").innerHTML = 3.75*document.getElementById("doller").value;
};

document.getElementById('doller').Value should be changed to document.getElementById('doller').value.
Value should be lowercase.
/*global console*/
function convertUsdToRiyal() {
var amount = document.getElementById('doller').value,
result = 3.75 * amount,
massage = document.getElementById('result');
console.log(amount);
massage.innerHTML = result;
}
<input type="text" id='doller'>
<button onclick="convertUsdToRiyal()">convert usd to Riyal</button>
<div id ="result"></div>

replace the string from just before the last dot(.) [closed]

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I have a string like A/B/C/D.txt
So I want to replace the character just before the last . with the new one.
Like I would add E in last So the output should be A/B/C/E.txt
Can this is possible with only replace and concat Or Regex should help?

I'm sure the output is correct.
A/B/C/E.txt
var filename = 'A/B/C/D.txt';
var dotIndex = filename.lastIndexOf('.');
document.write(filename.substr(0, dotIndex-1) + 'E'+filename.substr(dotIndex, filename.length-dotIndex));

var parts = 'A/B/C/D.txt'.split('.');
if(parts.length > 1)
{
parts[parts.length-2] = parts[parts.length-2].replace(/.$/,"E");
let result = parts.join('.');
console.log(result);
}

Try this:
let name = "A/B/C/D.txt"
let res = name.substr(0, name.lastIndexOf(".")) + "E." + name.substr(name.lastIndexOf(".") + 1);
console.log(res);

How to validate postcode in a form using JavaScript [closed]

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I'm trying to validate a postcode using JavaScript.
I have my regex.
^([Gg][Ii][Rr] 0[Aa]{2})|((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([A-Za-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z])))) {0,1}[0-9][A-Za-z]{2})$
This is my function so far, not sure how to implement regex.
function validatePostcode()
{
var postcode = document.getElementById("postcode").value;
}
Any other suggestions that would format a postcode that matches;
CF24 9DG

You can do something like this:
function validatePostalCode(){
var regExp = /^([Gg][Ii][Rr] 0[Aa]{2})|((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([A-Za-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z])))) {0,1}[0-9][A-Za-z]{2})$/;
var postcode = document.getElementById("postcode").value;
if( regExp.test( postcode ) ){
// Do something here, result is true.
} else {
alert("result is false");
}
}
You can try it out in this fiddle: http://jsfiddle.net/Cedriking/5b8wtf1f/2/

You should use JavaScript test() Method RegExpObject.test(string) that returns:
TRUE if the input string matches the RegExpObject regex
FALSE if the input string does not match the RegExpObject regex
Your validator function should look like this:
var validatePostCode = function(postCode) {
var parsePostCode = 'your_regex';
return parsePostCode.test(postCode);
};
var postCode = document.getElementById("postcode").value;
validatePostCode(postCode); // calling the validator function

I can't replace this pattern in javascript [closed]

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I need your help on my new project
I hate regular expressions and its rules but i must use it this project.
want do this replace
var aString = '[bkz:sample key]';
I want get into key variable 'sample key' value from this aString
var key,clean;
key = 'sample key';
clean = cleanChars(key);
// clean = sample_key
//my target
key
how can i do this?
thanks in advance

function extractKey(str) {
var match = (str || '').match(/^\[bkz:(.+)\]$/);
return match? match[1] : '';
}
extractKey('[bkz:sample key]'); //sample key

var aString = "[bkz:sample key]";
var regex = /^\[(.+)\:(.+)\]$/;
var matches = regex.exec(aString);
// "sample key" should now be in matches[2]

Variable reset to default option, WHY? [closed]

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I do not understand how I keep ending up with "null" after variable is assigned a number.
function evalKayScript(syn){
coms = extract(syn,"{...}");
document.write(JSON.stringify(coms));//debug
for(x in coms){
ops = extract(coms[x],"(...)");
com = null; //<-- ***com preset null***
for(y in funNames){
if(ops[1] == funNames[y]){
com = y; //<-- ***com changed to "y"***
}
}
alert(com); <-- alerts given below (first two alerts)
if(com == null){
alert("Command ((("+ops[1]+"))) Not Registered!");
return null;
}
exe = funValues[y];
inputs = execVars(ops[2]);
inputs = extract(inputs,"[...]");
for(y in inputs){
exe.replace(new RegExp("/\(\%"+y+"\%\)/gim"),inputs[y]);
}
exe.replace(new RegExp("/\(\%name\%\)/gim"),ops[0]).replace(new RegExp("/\(\%function\%\)/gim"),ops[1]);
exea = exe;
if(exe.replace(new RegExp("/\:\:\:javascript/gim"),"")! = exes){ //<-- new invalid ":" error
eval(exe);
}else{
evalKayScript(exe);
}
}
}
I do not understand why, variable "com" goes to a number, then back to null...
I have setup some error catching in my own form, and i end up with these alerts:
0 //<-- var com
null //<-- ***var com? this makes no sense, how does it go back to null?***
Command ((("(%name%) already exists!"))) Not Registered! //<--caused by if(com == null) This is normal.
Live script at http://jstone88.bugs3.com/kayscript/file1.html, and JS file at http://jstone88.bugs3.com/kayscript/kayscript.js

You aren't using RegExp constructor as it should have been used.
It is like this:
new RegExp("pattern without / at the beginning an end","flags");
/pattern/flags is literal form of writing a regex in js, but it is different in RegExp constructor.