How to break a word using Javascript - javascript

I'm developing a website and I need to break a word after "_".
For example, I have this "word":
test_test_test_test
And I want to break like this:
test_
test_
test_
test_
Is that possible?
Thanks.
I tried this, but didn't work:
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
var str = $('p').text();
var str_list = str.split("_");
for (var i = 0; i < str_list.length; i++) {
$('p').text(str_list[i] + "_");
}
});
</script>
</head>
<body>
<p>test_test_test_test</p>
<p>test2_test2_test2_test2</p>
</body>
</html>

'test_test_test_test'.match(/([a-z0-9]+_?)/gi)
the result is:
["test_", "test_", "test_", "test"]

You're looking for split.
var str = "test_test_test_test";
var str_list = str.split("_");
alert(str_list[0]);
If you want to print all of them then you need to iterate over the list.
for (var i = 0; i < str_list.length; i++) {
// I append the underscore to the end. Remove that bit if you don't want an underscore
alert(str_list[i] + "_");
}

var str ="test_test_test_test";
var parts=str.split('_');
parts.forEach(function(part){
alert(part+'_');
});

Here is another way to do it:
var words = word.replace(/_/g '_\0').split('\0');
The idea is to insert a marker after each _ and split on it. The marker should be a character that is not expected to appear in the actual data.

Related

New to Javascript, could someone help me with this substring problem?

The below script returns the following into my html:
"3.9 °C {alarm,unackedAlarm}"
I would like to remove the "{alarm,unackedAlarm}" section so it just shows the temperature value. I believe I need to use a substring to achieve this but I cannot work out where to place it?
Thanks
<script src="https://requirejs.org/docs/release/2.3.6/minified/require.js" ></script>
require(['baja!', 'dialogs'], function (baja, dialogs) {
var sub = new baja.Subscriber();
sub.attach('changed', function(prop) {
if(prop.getName() === 'value');
{
document.getElementById("oat").innerHTML = ( this.get(prop));
}
});
baja.Ord.make('station:|slot:/BajaScriptExamples/Components/Ramp/out/value').get({ subscriber: sub});
});
'''
I would suggest using the regex approach just in case the number of characters change.
function extract(text) {
const pattern = /^(.*) {.*}$/g;
const match = [...text.matchAll(pattern)];
if (match.length == 0 || match[0].length == 0) {
console.error("text does not match");
return;
}
return match[0][1];
}
console.log(extract("3.9 °C {alarm,unackedAlarm}"));
The main idea here is to catch any string that follows this pattern (.*) {.*} and return what is in contained between the parenthesis (group).
The requirement of extracting specific part of a string can be done easily by using the split() function of Javascript.
Here are working examples using split:
Example 1: Split the string at blank spaces and print the first two parts.
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var str = "3.9 °C {alarm,unackedAlarm}"
var result = str.split(" ")
document.getElementById("demo").innerHTML = (result[0] + " " + result[1])
</script>
</body>
</html>
Example 2: Split the string at '{' and print the first part.
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var str = "3.9 °C {alarm,unackedAlarm}"
var result = str.split("{")
document.getElementById("demo").innerHTML = (result[0].trim())
</script>
</body>
</html>
Output:
3.9 °C
More information:
https://www.w3schools.com/jsref/jsref_split.asp

My string reversing function appends “undefined” at the beginning

I have a short piece of HTML and JavaScript code. I wanted to write a function that reverses the input string. For example, input = hello, output = olleh.
This is what I have so far:
function go() {
var input = document.getElementById("input").innerHTML;
var output = document.getElementById("input");
var result = "";
for (var i = input.length; i >= 0; i--) {
result += input[i];
}
output.innerHTML = result;
}
onload = go;
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="question4.js"></script>
</head>
<body>
<div id="input">This text here</div>
<div id="output"></div>
</body>
</html>
Everything works fine, but the output has an undefined in front of the result. It looks like this:
undefinedereh txet sihT
How do I make the undefined go away?
Change: var i = input.length to var i = input.length-1 because the first time you loop you will be attempting to get input[i] (where i is the length of the input array).
If the array has 10 items in it, i will be 10, however the correct index for element 10 is 9.
start the loop from input.length-1

How can I add element after match character in jquery?

Trying to place an element after match second or more dots in a text if it has a specific number of characters. Example:
<div id="mytext">
This is just a example. I need to find a solution. I will appreciate any help. Thank you.
</div>
<script>
var chars = 55;
if ($('#mytext').text().length > chars){
//add <br> after first dot found after number of chars specified.
}
</script>
... The output would be:
This is just a example. I need to find a solution. I will appreciate any help.<br>
Thank you.
You can try this
var chars = 55;
if ($('#mytext').text().length > chars){
var text = $('#mytext').text(); // div text
var chars_text = text.substring(0, chars); // chars text
var rest = text.replace(chars_text, '').replace(/\./g,'. <span>After Dot</span>'); // rest of text and replace dot of rest text with span
$('#mytext').html(chars_text+rest); // apply chars and rest after replace to the div again
}
span{
color: red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="mytext">
This is just a example. I need to find a solution. I will appreciate any help. Thank you.
</div>
Note: if you just need to replace the next one dot after chars you can
use '.' instead of /\./g
this way : With JQUERY Substring
<p>
this is test string with jquery . test 1 2 3 4 45 5 . test test test
</p>
<b></b>
<script>
var a = $('p').text();
var _output = '';
var _allow_index = 40;
if (a.length > _allow_index)
{
var x = a.split('.');
for(var i=0; i<x.length; i++)
{ if (_output.length < _allow_index) { _output+=x[i]+'.'; } }
}
else { _output = a; }
$('b').html(_output + '<br>'+a.substr(_output.length,a.length));
</script>
Doing that doesn't seem to be a very good practise, for instance length may vary for localised languages.
Besides, you're assuming you have a plain text, rather than an HTML text and length is different in both cases. You may want to use html() instead of text().
However here is a way for the given case:
var container = $('#mytext');
var length = 55;
var insert = '<br/>';
var text = container.text().trim(); // text() or html()
var dotPosAfterLength = text.indexOf(".", length);
if (dotPosAfterLength != -1) {
container.html(
text.substring(0, dotPosAfterLength+1)
+insert
+text.substring(dotPosAfterLength+1)
);
}
You just need to add this property in CSS.
<div id="mytext">
This is just a example. I need to find a solution.
I will appreciate any help. Thank you.
</div>
<style>
div#mytext{
word-wrap: break-word;
}
</style>

How to extract all hyperlink titles from big html string using javascript?

I got an HTML string as :var code; I want to extract all hyper link title values in this big string and place them in textarea. I tried the following but it never works. could any one tell me what i am doing wrong?
sample hyperlinks to look for(i want to extract mango,cherry,...) :
mango
cherry
my code string has blocks of data like below:
<div class="details">
<div class="title">
mango
<span class="type">3</span>
</div>
</div>
full code:
$.getJSON('http://anyorigin.com/get?url=http://asite.com/getit.php/&callback=?', function(data){
//$('#output').html(data.contents);
var siteContents = data.contents;
//writes to textarea
document.myform.outputtext.value = siteContents ;
var start = siteContents.indexOf('<ul class="list">');
var end = siteContents.indexOf('<ul class="pag">', start);
var code = siteContents.substring(start, end);
document.myform2.outputtext2.value = code ;
var pattern = /<a href="([^"]+?)">([^<]+?)<\/a>/gi;
code = code.match(pattern);
for (i = 0; i < code.length; i++) {
document.write($2<br />'));
}
});
</script>
It looks like you're trying to parse HTML with regex. This post has some more info on that topic.
Since this question is tagged as jQuery, you could try something like the following...
Make a jQuery object out of the returned HTML:
$markup = $(data.contents);
Find the anchors:
$anchors = $markup.find('a');
Get the text (or whatever attribute you want from it):
arrText = [];
$anchors.each(function() {
arrText.push($(this).text());
});
Put result into textarea:
$textarea.val(arrText.join(','));
To achive this jquery is the simplest solution, you can try below code
$('a').each(function(){
var copiedTitle = $(this).html();
var previous = $('#test').html();
var newText = previous +"\n"+ copiedTitle;
$('#test').html(newText);
});
JS Fiddle

How do I write a variable a certain amount of times?

var x=5
var char="Hi!
Is there any way to make JS write char x amount of times inside of an html element?
<span>Hyper guy wants to tell you
<script>
var x=5;
var char="Hi!;
document.write(char) and repeat x times;
</script>
</span>
The problem with using document.write is that it erases the whole page, so how would I insert it in context?
Use a loop that loops 5 times, each time adding 'Hi!' onto the end.
var x = 5;
var char = '';
while (x--) {
char += 'Hi!';
}
// write once
document.write(char);
Or, you can just write 5 times:
var x = 5;
var char = 'Hi!';
while (x--) {
document.write(char);
}
Up to you which you choose, though I'd prefer the first (the less you mess with the document, the better).
try this:
<span>Hyper guy wants to tell you
<script type="text/javascript">
var x=5;
var c="Hi!"; //close the quotes.
for (;x>=0;--x)
document.write(c);
</script>
</span>
document.write(..) doesnt erase the content of the entire page, if it is used in a proper way.
Really? I'm not sure where you got the idea that it erases the page first.
When I execute the following in FF3, after adding the missing closing quote following Hi!:
<html>
<head></head>
<body>
<span>
Hyper guy wants to tell you
<script type="text/javascript">
var x=5;
var chars="Hi! ";
var i;
for (i = 0; i < x; i++) document.write(chars);
</script>
</span>
</body>
</html>
I get:
Hyper guy wants to tell you Hi! Hi! Hi! Hi! Hi!
Create a HTML element in the page where you want to insert text
Use document.getElementById to get the element and append the text to element using .innerHTML .text property to it
http://www.tizag.com/javascriptT/javascript-innerHTML.php
example:
//add this empty span in the HTML page
<span id="newText"></span>
<script type="text/javascript">
var x=5, count;
var char='Hi!', resultString = '';
for(count=0;count<x;count++)
{
resultString = resultString + char;
}
document.getElementById('newText').innerHTML = resultString;
</script>

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