How do I select text between two characters in Javascript? - javascript

So I am currently trying to find out how to select text between two characters(for the example I will use a slash / )
Here is what I have so far.
<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
function startWhenLoaded() {
var text = $("p").text();
var secondStartingPoint, startPointOne, startPointTwo;
if (text.indexOf("/", 0) !== -1) {
//I did -1 because indexOf returns -1 if nothing is found.
/*Also, the second argument in indexOf() acts as my starting
point for searching.*/
secondStartingPoint = text.indexOf("/") + 1;
startPointOne = text.indexOf("/") + 1;
if (text.indexOf("/", secondStartingPoint) !== -1) {
startPointTwo = text.indexOf("", secondStartingPoint) + 1;
var selectedText = slice(startPointOne, startPointTwo);
$("body").append("<p>" + selectedText + "</p>");
//but nothing happens.
}
}
</script>
</head>
<body onload="startWhenLoaded()">
<p>/can I select and duplicate this?/</p>
</body>
</html>
But it doesn't do anything.

It could be achieved simply by using a regex like :
<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
function startWhenLoaded() {
var text = $("p").text();
var extracted = text.match(/\/(.*)\//).pop();
alert('The extracted text is :'+extracted);
}
</script>
</head>
<body onload="startWhenLoaded()">
<p>Some text here in the start /can I select and duplicate this?/ Some extra text at the end</p>
</body>
</html>

Regex is simplest and easiest way to get your solution.
use exec() function to get text between '/';
console.log(/^\/(.*)\/$/.exec('/some text, /other example//'))

Related

Trouble getting real time word count from html textbox

I am very new to html and javascript. I have a textbox and am trying to count the number of words, then displaying the count in real time. I do not understand what I am doing wrong in this, or how to correct it. textContent does not make much sense to me.
<html>
<head>
<style>
input[type='text'] {width:50px;}
textarea {width:500px;height:300px;}
</style>
</head>
<body>
<div>
<h2>Test</h2>
<p>The number of words is <span id="wordCount"></span></p>
<textarea id="toCount"></textarea>
</div>
<script>
document.getElementById('toCount').addEventListener('input', function () {
var text = this.textContent,
count = text.trim().replace(/\s+/g, ' ').split(' ').length;
document.querySelector('.wordCount').textContent = count;
});
</script>
</body>
</html>
The error that I get right now says
Uncaught TypeError: Cannot set property 'textContent' of null
Your selector should be #wordCount, and the textarea content can be accessed using value:
<html>
<head>
<style>
input[type='text'] {width:50px;}
textarea {width:500px;height:300px;}
</style>
</head>
<body>
<div>
<h2>Test</h2>
<p>The number of words is <span id="wordCount"></span></p>
<textarea id="toCount"></textarea>
</div>
<script>
document.getElementById('toCount').addEventListener('input', function () {
var text = this.value,
count = text.trim().replace(/\s+/g, ' ').split(' ').length;
document.getElementById('wordCount').textContent = count;
});
</script>
</body>
</html>
The reason why you are getting null is: in selection, #wordCount is by Id, and .wordCount is by class. So document.querySelector('.wordCount') is returning null as there is no element with class wordCount.
The fix would be to simply change
document.querySelector('.wordCount').textContent = count;
to
document.querySelector('#wordCount').textContent = count;
Try this one.
document.getElementById('toCount').addEventListener('input', function () {
// var text = this.textContent,
var text = this.value,
count = text.trim().replace(/\s+/g, ' ').split(' ').length;
// document.querySelector('#wordCount').textContent = count;
document.querySelector('#wordCount').textContent = count;
});
try this.
document.getElementById('toCount').addEventListener('input', function () {
var text = this.value,
count = text.trim().split(' ').length;
document.querySelector('#wordCount').textContent = count;
});
Here is the jsfiddle

JavaScript - How can I 'translate' the input to something different

I'm trying to make a program where if you for example type in "less" in the textarea the output should show "<". What is the best way to do this?
This is how far I've gotten:
<!doctype html>
<html lang="en">
<head>
<title>Group 7 - Deckcode to JavaScript</title>
</head>
<body>
<h1>Group 7 - Deckcode to JavaScript</h1>
<p>Input your deckode below:</p>
<textarea id="myTextarea"></textarea>
<button type="button" onclick="myFunction()">Translate</button>
<p id="demo"></p>
<script>
function myFunction() {
var input
if (myTextarea == "less") {
console.log("<");
}
}
</script>
</script>
</body>
</html>
You're trying to fish values out of the DOM incorrectly. Use document.getElementById to locate the element in the DOM, and take its value for the value you require.
function myFunction() {
var textAreaValue = document.getElementById("myTextarea").value;
if (textAreaValue == "less") {
console.log("<");
}
}
I suggest using an object like this:
var translations = {};
translations["less"] = "<";
translations["greater"] = ">";
And then in your function you do like this:
function myFunction() {
var value = document.getElementById("myTextarea").value;
console.log(translations[value] ? translations[value] : "No translation found");
}
It would also be easy to add more translations e.g. based on data from a database or similar.
as and alternative to IF-condition, you can use
if (textAreaValue.indexOf("less") > -1) {
console.log("<");
}
so if the text area contains "less" text then the console prints "<"
indexOf method

Jquery .get not retrieving file

i have a code that is supposed to read from a html file, split it into an array and display parts of that array, but when going though with alert, i found that $.get is not actually getting the file
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"> </script>
</head>
<body>
<button onclick="myfunction()">update</button>
<div id="div1"></div>
<script>
function myfunction() {
var info = "";
$.get("../Read_Test/text.html", function(data) {
SomeFunction(data);
});
alert(info);
var array = info.split("§n");
var people = array[1].split(",");
for (var i = 0; i < people.length; i++) {
document.getElementById("div1").innerHTML = people[i] + "<br>";
}
}
function SomeFunction(data) {
var info = data;
}
</script>
</body>
</html>
the directories are on a server and go like so:
Sublinks->Read_Test->This_File.html,text.html
The objective of this is that a file would have something along the lines of "a§nb1,b2,b3,§n" and the script would split it via "§n" then get "array[1]" and split that via ",". lastly it displays each part of that newly created array on a new line, so a file with "a§nb1,b2,b3,§n" would result in:
b1
b2
b3
Please help
Ajax is asynchronous, it make request and immediately call the next instruction and not wait for the response from the ajax request. so you will need to process inside of $.get. success event.
I have changed delimiter character to ¥. change same in text.html. problem was you have not mentioned character set to utf8 and due to this it could not recognized the special character and subsequently not able to split the string. i have aldo document type to HTML5.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>
<body>
<button onclick="myfunction()">update</button>
<div id="div1"></div>
<script>
function myfunction() {
$.get("../Read_Test/text.html", function(data) {
var info = data;
var array = info.split("¥");
var people = array[1].split(",");
for (var i = 0; i < people.length; i++) {
document.getElementById("div1").innerHTML += people[i] + "<br>";
}
});
}
</script>
</body>
</html>

How do I control the font weight of any text within a paragraph (<p> tag) within braces or curly brackets { } using JavaScript

I would like to be able to control the font-weight of text if bracketed inside a p tag using JavaScript.
For instance:
The cow jumped over the {moon}. font-weight within {} would be increased.
This so the end user can type this into a text area and on submit the would print to page altering the font-weight within the braces or curly brackets.
Any help on this would be great.
Here is how you can do this:
var ps = document.getElementsByTagName('p');
foreach = Array.prototype.forEach;
foreach.call(ps, function (p) {
var content = p.innerHTML;
p.innerHTML = content.replace(/\{(.*?)\}|\((.*?)\)/g, function (m) {
return '<span style="font-weight: bold;">' + m + '</span>';
});
});
​
And of course a fiddle.
For the example you need just pure JavaScript, no additional libraries.
Edit:
If you don't want to see the brackets in the result you can use:
var ps = document.getElementsByTagName('p');
foreach = Array.prototype.forEach;
foreach.call(ps, function (p) {
var content = p.innerHTML;
p.innerHTML = content.replace(/\((.*?)\)|\{(.*?)\}/g, function (m) {
return '<span style="font-weight: bold;">' + m.replace(/[\(\)\{\}]/g, '') + '</span>';
});
});
Fiddle: http://jsfiddle.net/ma47D/4/
​
Best regards!
You can do it with mootools like this:
window.addEvent('domready', function()
{
$$('P').each(function(p)
{
p.set('html', p.get('text').replace(/{([^\}]*)*}/g,"<b>$1</b>"));
});
});​
domready is important because it must be done after page is completely loaded. converting to jquery would not be so hard.
http://jsfiddle.net/Smw7Q/1/
Locally you can handle it like this:
<!DOCTYPE html>
<html>
<head>
<script>
function transfer(){
document.getElementById("result").innerHTML=document.getElementById("demo").value.replace(/{/g,'<strong>').replace(/}/g,'</strong>');
}
</script>
</head>
<body>
Input: <input type="text" name="input" id="demo"><br>
<input type="button" value="Submit" onclick="transfer();">
<p id="result"></p>
</body>
</html>
If you submit the text to server, the magic can be done similarly at server side.
My suggestion
<!DOCTYPE html>
<html>
<head>
<style>
p span {
font-size:1.5em;
}
</style>
<script>
function regex(){
document.getElementById("output").innerHTML=
document.getElementById("input").value.replace(/{(.*?)}/g, "<span>$1</span>");
};
</script>
</head>
<body>
<p id="output"></p>
<textarea id="input" rows="30" cols="80"></textarea>
<input type="button" value="Input" onclick="regex();"/>
</body>
<html>
Of course, prior to submitting, you need to sanitize your data.
If tried something, but I'm sure there are more elegant solutions.
http://jsfiddle.net/xT7Fg/
$(document).ready(function(){
$(tb).blur(function(){
var str = '';
var nextFont = 0;
$.each($(tb).val(),function(i,char){
if(nextFont == 0){
if(char == '{'){
if($(tb).val().indexOf(i,'}')){
str += '<font size="15">';
nextFont = $(tb).val().indexOf('}', i);
} else {
str += char;
}
} else {
str += char;
}
} else if (nextFont === i) {
str += '</font>';
nextFont = 0;
} else {
str += char;
}
});
$("#txt").html(str);
});
});

Maintain div scroll position on postback with html/javascript

Is there a way to maintain the div scroll position on a postback, without using asp? So far I've only found solutions using asp.
http://blogs.x2line.com/al/articles/156.aspx
<!doctype html>
<html>
<head>
<title></title>
<script language="javascript">
// function saves scroll position
function fScroll(val)
{
var hidScroll = document.getElementById('hidScroll');
hidScroll.value = val.scrollTop;
}
// function moves scroll position to saved value
function fScrollMove(what)
{
var hidScroll = document.getElementById('hidScroll');
document.getElementById(what).scrollTop = hidScroll.value;
}
</script>
</head>
<body onload="fScrollMove('div_scroll');" onunload="document.forms(0).submit()";>
<form>
<input type="text" id="hidScroll" name="a"><br>
<div id="div_scroll" onscroll="fScroll(this);" style="overflow:auto;height:100px;width:100px;">
.. VERY LONG TEXT GOES HERE
</div>
</form>
</body>
</html>
Maybe this javascript code works for you
function loadScroll ()
{
var m = /[&?]qs\=(\d+)/.exec (document.location);
if (m != null)
myDiv.scrollTop = parseInt (m[1]);
}
function saveScroll ()
{
var form = document.getElementById ("myForm");
var sep = (form.action.indexOf ("?") == -1) ? "?" : "&";
form.action += sep + "qs=" + myDiv.scrollTop;
}
Now, you can watch for the "submit" event to save the position in the "action" attribute:
document.getElementById ("myForm").addEventListener ("submit", saveScroll, false);
And in your BODY tag...
<body onload="loadScroll ();">
....
</body>
I can't test the code right now, but I think you get the idea.

Categories

Resources