Find the word after specific word - javascript

i am new in javascript.
I have below code where textarea contains text as...
<textarea id="myBox" >
{Picker:} Helper
This is just demo...
</textarea>
<br/>
<span id="ans"></span> <br/>
<input type="button" onclick="getWord()" value="Click"/>
i am trying to find out the word exact after the {Picker:}, i.e. i want to find word "Helper". So word {Picker:} is the point from where i am starting to find immediate word after it. For this i using indexOf. What i did uptil now is ...
<script>
function getWord() {
var val = $("#myBox").val();
var myString = val.substr((val.indexOf("{Picker:}")) + parseInt(10), parseInt(val.indexOf(' ')) );
$("#ans").text(myString);
}
</script>
will anyone guide me to find what mistake i am making. Thanks in advance.

You should start from the index of "{Picker:}" + 9, because the length of the particular string is 9.
Parse till the the index of '\n' which is the line break character.
String.prototype.substr() is deprecated, use String.prototype.substring() instead.
function getWord() {
var val = $("#myBox").val();
var myString = val.substring((val.indexOf("{Picker:}")) + 9, val.indexOf('\n'));
$("#ans").text(myString);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<textarea id="myBox">
{Picker:} Helper
This is just demo...
</textarea>
<br />
<span id="ans"></span> <br />
<input type="button" onclick="getWord()" value="Click" />

var val = $("#myBox").val();
console.log(val)
var tempArray = val.replace("\n", " ").split(" ");
var wordToFind;
for(var i = 0 ; i < tempArray.length; i++) {
var word = tempArray[i];
if (word == "{Picker:}") {
wordToFind = tempArray[i + 1]
}
}
console.log(wordToFind)
This will assign what ever word comes after Picker: to the wordToFind variable.
Check working :https://jsfiddle.net/o5qasnd0/14/

You could do something like this
const text = "{Picker:} Helper";
const wordArr = text.split(' ');
const idx = wordArr.indexOf('{Picker:}');
console.log(idx != -1 && (idx + 1) < wordArr.length ? wordArr[idx + 1] : 'not found');

Related

Why is my character counter not excluding spaces?

I am making a character counter with HTML, CSS, JS. I got the counter working, but I have a checkbox that should get the length of the input without the spaces, but it is not working. Please check my code and tell me what's wrong.
function char_count(str, letter) {
var letter_Count = 0;
for (var i = 0; i < str.length; i++) {
if (str.charAt(i) == letter) {
letter_Count += 1;
}
}
return letter_Count;
}
function countChars(obj) {
var length = obj.value.length;
var output = document.getElementById("chars");
var dis = document.getElementById("removeSpace");
if (dis.checked) {
var spaces = char_count(obj, " ");
length = length - spaces;
output.innerHTML = length + ' characters';
} else {
output.innerHTML = length + ' characters';
}
}
<h1> Character Counter </h1>
<textarea id="input" onkeyup="countChars(this)" placeholder="Enter your text here..." autofocus></textarea>
<input type="checkbox" id="removeSpace">
<label for="removeSpace" onclick="countChars(document.getElementById('input'))">Don't Include Spaces</label>
<span id="chars">0 Characters</span>
You could make the code more simpler. Moreover, you have placed the checkbox outside the label that has onclick="countChars(document.getElementById('input'))", that's why the condition dis.checked in js does not find the checkbox as checked. Place the checkbox inside the label.
The whole simplified code would be like this,
<h1> Character Counter </h1>
<textarea id="input" onkeyup="countChars(this)" placeholder="Enter your text here..." autofocus></textarea>
<label for="removeSpace" onclick="countChars(document.getElementById('input'))">
<input type="checkbox" id="removeSpace">
Don't Include Spaces</label>
<span id="chars">0 Characters</span>
<script>
function countChars(obj) {
var length = obj.value.length;
var output = document.getElementById("chars");
var dis = document.getElementById("removeSpace");
if (dis.checked) {
length = obj.value.replace(/\s/g, '').length
}
output.innerHTML = length + ' characters';
}
</script>

How to skip converting element text

i want output text oldnames not changes if user insert text 'false'
for example:
user input text "false toni" in textbox.
and i want output still "false toni"
why my code still changes text "toni" with "rina"?
<script type="text/javascript" charset="utf-8">
String.prototype.replaceArr = function(find, replace) {
var replaceString = this;
var regex;
for (var i = 0; i < find.length; i++) {
regex = new RegExp(find[i], "g");
replaceString = replaceString.replace(regex, replace[i]);
}
return replaceString;
}
function test() {
var x = document.getElementById("myText").value;
var oldNames = ['toni','rian'];
var newNames = ['rina','susi'];
if (oldNames== 'false ' + oldNames){
document.getElementById("check").innerHTML = x.replaceArr(oldNames, oldNames);
}else{
document.getElementById("check").innerHTML = x.replaceArr(oldNames, newNames);
}
}
</script>
<body>
ENTER TEXT: <br>
<textarea name="kata_cari" id="myText" style="width:100%; height:100px;"></textarea>
<br>
<input type="button" onclick="test();" value="Check!">
<br>
<p id="check"></p>
</body>
UPDATE:
Improve the question:
Trying enter text "My name is rian and my name is false toni" .
Posible to make output "rian" still change to "susi"?
use includes x.includes(value) to check whether the text area value contains a word that you want to replace . if it contains false then your oldnames not get changed.
If you are using IE then use x.indexOf(value)>0 instead of x.includes(value)
http://www.w3schools.com/jsref/jsref_includes.asp
<script type="text/javascript" charset="utf-8">
String.prototype.replaceArr = function(find, replace) {
var replaceString = this;
var regex;
for (var i = 0; i < find.length; i++) {
regex = new RegExp(find[i], "g");
replaceString = replaceString.replace(regex, replace);
}
return replaceString;
}
function test() {
var x = document.getElementById("myText").value;
var oldNames = ['toni', 'rian'];
var newNames = ['rina', 'susi'];
oldNames.forEach(function(value, index) {
/*if (x.includes('false '+value)){
var oldNames1=['false '+value];
x = x.replaceArr(oldNames1, oldNames1);
}*/
if (x.includes(value)) {
var oldNames1 = [value];
x = x.replaceArr(oldNames1, newNames[index]);
newNames1 = ['false ' + newNames[index]];
oldNames1 = ['false ' + value];
x = x.replaceArr(newNames1, oldNames1);
}
});
document.getElementById("check").innerHTML = x;
}
</script>
<body>
ENTER TEXT:
<br>
<textarea name="kata_cari" id="myText" style="width:100%; height:100px;"></textarea>
<br>
<input type="button" onclick="test();" value="Check!">
<br>
<p id="check"></p>
</body>
You false checking condition is wrong, you can do it using substr:
if (x.substr(0, 6) === 'false ') {
// The string starts with false
} else {
}
You can find more details on the substr from MDN.
UPDATE: As mentioned in the comment same can be done via startsWith and this is a better approach.
if (x.startsWith('false ')) {
// The string starts with false
} else {
}
try this. Compare array values instead of array.
<script type="text/javascript" charset="utf-8">
String.prototype.replaceArr = function(find, replace) {
var replaceString = this;
var regex;
for (var i = 0; i < find.length; i++) {
regex = new RegExp(find[i], "g");
replaceString = replaceString.replace(regex, replace[i]);
}
return replaceString;
}
function test() {
var x = document.getElementById("myText").value;
var oldNames = ['toni','rian'];
var newNames = ['rina','susi'];
if (x.indexOf('false') > -1 ){
document.getElementById("check").innerHTML = x.replaceArr(oldNames, oldNames);
}else{
document.getElementById("check").innerHTML = x.replaceArr(oldNames, newNames);
}
}
</script>
<body>
ENTER TEXT: <br>
<textarea name="kata_cari" id="myText" style="width:100%; height:100px;"></textarea>
<br>
<input type="button" onclick="test();" value="Check!">
<br>
<p id="check"></p>
</body>

Find matched letter from each word in javascript array

I have an array in javascript like that :
var books = ['spring','last night','sweet heart','the sky','tomorrow'] ;
I have textarea
<textarea id="text" name="textpreview" class="text"></textarea>
So what I want is when I enter letter s then I will get two suggestions books just the first word not the second word I mean not sky Just spring and sweet heart .
I will get two spans
<textarea id="text" name="textpreview" class="text"></textarea>
<span>spring</span>
<span>sweet heart</span>
If I type again after s the p letter like sp in textarea then I will get just spring
<textarea id="text" name="textpreview" class="text"></textarea>
<span>spring</span>
and so on .
If I type n I will get nothing.
If I type t I will get tomorrow and the sky
Hope it can be done . Thanks for your support .
This help you :
<html>
<head>
<title></title>
</head>
<body>
<textarea id="text" name="textpreview" class="text"></textarea>
<p id="x"></p>
<script>
var x = document.getElementById("x");
var books = ['spring','last night','sweet heart','last night','the sky','tomorrow','tomorrow'];
var txt = document.getElementById("text");
txt.onkeyup = function(event) {
var str = "";
var arr = [];
var index = (txt.value).indexOf("#");
if(index !== -1 && (txt.value).substr(index + 1).length > 0) {
var value = (txt.value).substr(index + 1);
value = value.replace(/[\.\+\*\\\?]/g,'\\$&');
var patt = new RegExp("^" + value);
for(var i=0; i<books.length; i++) {
if(patt.test(books[i]) && arr.indexOf(books[i]) === -1) {
arr.push(books[i]);
}
}
}
if (arr.length < 1 )
x.innerHTML = "";
else {
for(var i=0; i<arr.length; i++)
str+=arr[i]+"<br>";
x.innerHTML = str;
}
}
</script>
</body>
</html>
This problem consists of two parts: Reading and writing your input/output from/to the DOM, and filtering your array books.
The reading and writing part should be easy, there are plenty of guides on how to achieve this.
To filter the books array, JavaScript offers a number of helpful functions:
var books = ['spring','last night','sweet heart','the sky','tomorrow'];
var input = 'S';
var result = books.filter(function(book) {
return book.toLowerCase().indexOf(input.toLowerCase()) === 0;
}).slice(0, 2);
console.log(result); // ['spring', 'sweet heart']
#TimoSta is correct that this is a two-part problem.
I expanded on his code a bit using angular to display the results in the DOM.
http://jsfiddle.net/kcmg9cae/
HTML:
<div ng-controller="MyCtrl">
<textarea id="text" name="textpreview" class="text" ng-model="startsWith"></textarea>
<span ng-repeat="book in sortedBooks()">{{ book }}</span>
</div>
Javascript:
var myApp = angular.module('myApp',[]);
function MyCtrl($scope) {
$scope.books = ['spring','last night','sweet heart','the sky','tomorrow'];
$scope.sortedBooks = function () {
var sortedBooks = [];
for (var i = 0; i < $scope.books.length; i++){
if ($scope.books[i].toLowerCase().indexOf($scope.startsWith.toLowerCase()) === 0)
sortedBooks.push($scope.books[i]);
}
return sortedBooks;
}
}

How to find if there is a space in a string... tricky

I'm doing this for a school project but one thing is bugging me, there is a part of the project that requires me to change white space or just " " a space to a number. Here is my code:
I know its messy, I've only been coding for half a year
exclsp is "exclude spaces"
inclsp is "include spaces"
dispwos is "display without spaces"
dispwsp is "display with spaces"
var txt;
var num;
var spce = 0;
function cnt()
{
txt = document.getElementById('disp').value;
num = txt.length;
// includes spaces into the returned number
if (document.getElementById("inclsp").checked == true)
{
document.getElementById("dispwsp").innerHTML = num + " characters.";
}
// excludes spaces from the returned number
if (document.getElementById("exclsp").checked === true)
{
for (var i = 0; i < num; i++) {
if (txt.includes(" "))
{
// alert("THERES A SPACE HERE");
spce++;
}
else
{
num = num;
}
}
}
document.getElementById("dispwos").innerHTML = num - spce + " characters.";
}
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script src="LetterCount.js"></script>
<link rel="stylesheet" type="text/css" href="LetterCount.css"/>
<title>Letter Counter</title>
</head>
<body>
<textarea rows="4" cols="50" placeholder="Input your text here!" id="disp"></textarea><br>
<form name="form1">
<input type="radio" name="button" id="inclsp"> Include spaces</input><br>
<input type="radio" name="button" id="exclsp"> Exclude spaces</input><br>
</form>
<button onclick="cnt()">Click Me!</button><br><br>
<div id="dispwsp"></div>
<div id="dispwos"></div>
</body>
</html>
I think you need to change this line:
if (txt.includes(" "))
to
if (txt[i] == " ")
so that you're actually checking each character rather that attempting to examine the whole string each time.
You could also use a regular expression and do it in one simple line of code and eliminate the loop altogether:
spce = txt.match(/\s/g).length
I don't understand the purpose of the dispwsp dispwos so I just removed them. You only have 1 result you want to display so why put it in different places just make one div for your result, like
<div id="result"></div>
And your JS can be simplified a lot, you don't need to loop through the letters. Here's the fiddle: https://jsfiddle.net/zwzqmd27/
function cnt() {
var inputText = document.getElementById("disp").value;
if (document.getElementById("exclsp").checked) //exclude spaces
{
document.getElementById("result").innerHTML = inputText.split(" ").join("").length + " characters";
}
else //include spaces
{
document.getElementById("result").innerHTML = inputText.length + " characters";
}
}
Possible duplicate of Check if a string has white space
But you can try this.
function hasWhiteSpace(s) {
return s.indexOf(' ') >= 0;
}
If You want to change a white space in a string to a number..
This could possibly help you ...
str.replace(/\s/g,"9");//any number(that You want)
This piece of code is basically replaces the white space with a number..
As #Micheal said, you can use indexOf() method to check if particular character(s) is present in your text content.
You just need to pass the character or substring(set of characters) to check if it is present.
Example :
var myText = "Sample text";
var substringIndex = myText.indexof(" "); //substringIndex = 6
substringIndex = mytext.indexof("ex");//substringIndex = 8;
substringIndex = mytext.indexof("tt"); // substringIndex =-1;
If substring doesn't matches, it will return -1 as index.
By using index you can say, if particular character(substring) presents if index value is greater than -1.
Note : If u pass set of characters, it will return only the starting index of the first character if entire set matches.
In your case, it would be like
...........
...........
if (txt.indexOf(" ")>-1)
{
// alert("THERES A SPACE HERE");
spce++;
}
else
{
num = num;
}
...............
...............
Just replace script with code bellow..
I do it for you...
var txt;
var num;
var spce = 0;
function cnt()
{
//to clear "dispwsp" and "dispwos" before action in cnt() function
document.getElementById("dispwsp").innerHTML = "";
document.getElementById("dispwos").innerHTML = "";
txt = document.getElementById('disp').value;
num = txt.length;
// includes spaces into the returned number
if (document.getElementById("inclsp").checked == true)
{
document.getElementById("dispwsp").innerHTML = num + " characters.";
}
// excludes spaces from the returned number
if (document.getElementById("exclsp").checked == true)
{
num = 0;
spce = 0;
for (var i = 0; i < txt.length; i++) {
var temp = txt.substring(i, (i+1));
if(temp==" ")
{
spce++;
}else
{
num++;
}
document.getElementById("dispwos").innerHTML = num + " characters and "+ spce +" spces ";
}
}
}

Removing a range starting occurrence with specified place

I need to define the text area to delete from 4th occurrence of (_) and preserve the extension.
before 12_345_678_900_xxxxxxxxxxxxxxx.jpg after 12_345_678_900.jpg,
before 34_567_890_123_xxxxxxxx_xxxxx_xxxxxxxxxxx.jpg
after 34_567_890_123.jpg
Is it possible?
One solution is to find the nth occurence and then use substring.
var one='12_345_678_900_xxxxxxxxxxxxxxx.jpg'; // 12_345_678_900.jpg
function nth_occurrence (string, char, nth) {
var first_index = string.indexOf(char);
var length_up_to_first_index = first_index + 1;
if (nth == 1) {
return first_index;
} else {
var string_after_first_occurrence = string.slice(length_up_to_first_index);
var next_occurrence = nth_occurrence(string_after_first_occurrence, char, nth - 1);
if (next_occurrence === -1) {
return -1;
} else {
return length_up_to_first_index + next_occurrence;
}
}
}
console.log(one.substring(0,nth_occurrence(one,'_',4))+one.substring(one.indexOf('.')));
Sure, split by "_" and then join back the data you want:
var str = "12_345_678_900_xxxxxxxxxxxxxxx.jpg";
str = str.split("_").slice(0,4).join("_") + "."+ str.split(".").slice(-1)
console.log(str)
Regular Expressions are great for this sort of scenario:
const data1 = '12_345_678_900_xxxxxxxxxxxxxxx.jpg'
const data2 = '34_567_890_123_xxxxxxxx_xxxxx_xxxxxxxxxxx.jpg'
const re = /^([^_]+_[^_]+_[^_]+_[^_]+).*(.jpg)$/;
var test1 = data1.replace(re, '$1$2');
var test2 = data2.replace(re, '$1$2');
Try it out: https://jsfiddle.net/648xt3qq/
There are probably a few different regular expression approaches that would get the job done
Maybe this works for you:
function clean() {
var el = document.getElementById('area');
el.value = el.value.replace(/^(.*?_.*?_.*?_.*?)(_.*?)(\..*?.*)$/gmi, '$1$3');
}
<form action="">
<textarea cols="50" rows="4" id="area">12_345_678_900_xxxxxxxxxxxxxxx.jpg
34_567_890_123_xxxxxxxx_xxxxx_xxxxxxxxxxx.jpg</textarea><br />
<input type="submit" onclick="clean(); return false;" />
</form>

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