We Keep Coding

Create multiple fields on input

I am trying to create multiple fields when I enter a number to tell it how many to create... I have utilised some code that I have written previously but now it's no longer working.
HTML:
<input type="text" name="rows">
jQuery:
$(document).ready(function() {
$('#rows').change(function() {
var rows = $(this).val();
for(i=0;i<=rows;i++) {
$('#form').append('<div><input type="text" name="N' + i + '"></div>');
$('#form').append('<div><select name="S'+ i +'"><option value="Text">Text</option><option value="editor">Editor</option></select></div>');
$('#form').append('<div><input type="text" name="V' + i + '"></div>');
}
}
}
Fiddle: https://jsfiddle.net/dc5665xk/1/

ID attribute is missing for rows element.
There is no form element having form as ID
Syntax error as closing braces were missing.
Note: var keyword was missing in for-loop
$(document).ready(function() {
$('#rows').change(function() {
var rows = $(this).val();
for (var i = 0; i <= rows; i++) {
$('#form').append('<div><input type="text" name="N' + i + '"></div>');
$('#form').append('<div><select name="S' + i + '"><option value="Text">Text</option><option value="editor">Editor</option></select></div>');
$('#form').append('<div><input type="text" name="V' + i + '"></div>');
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<form id="form">
<input type="text" name="rows" id="rows">
</form>

Allow only number digits in input type regex. issue is i am able to type this(1.) , want to prevent it

MY CODE
function validate(e, id) {
var reg = new RegExp('^\\d+$');
if (reg.test($("#" + id).val())) {
var value = $("#" + id).val();
alert(value);
} else {
alert("fail");
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<input name="input-type" type="number" id="number-input" oninput="validate(event,'number-input');">
This accept 1.(dot after any digits) value rest all is good.

You can try using <input type="tel" ...>. This way when user types 1. you will receive 1. only and not 1 and it will also open number keypad on mobile.
function validate(e, id) {
var reg = /^[0-9]*(\.(?=[0-9]+))*[0-9]+$/;
var value = $("#" + id).val();
if (reg.test(value)) {
console.log(value);
} else {
console.log("fail");
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<input name="input-type" type="tel" id="number-input" oninput="validate(event,'number-input');">
You can also refer to How to get the raw value an <input type="number"> field? for more information in why 1. returns 1 and not 1.

It work as fallow:
1 pass
1. fail
1.1 pass
function validate(e, id) {
var value = $("#" + id).val() + "";
if (new RegExp('^[0-9]+\.[0-9]+$').test(value)
|| ((new RegExp('^[0-9]+').test(value) && !value.includes(".")))
) {
var value = $("#" + id).val();
alert($("#" + id).val() + "->" + value);
} else {
alert("fail " + $("#" + id).val());
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<input name="input-type" type="text" id="text-input" oninput="validate(event,'text-input');">

Here is a code that might help you.In the below code when the user types . it is replaced by null.It only accepts digits.This is for input type="text".The variable currValue has the value of the input.
The search() method searches a string for a specified value, and returns the position of the match.The search value can be string or a regular expression.This method returns -1 if no match is found.
Then I am using .replace()
The replace() method searches a string for a specified value, or a regular expression, and returns a new string where the specified values are replaced.
Here I am replacing it with null if the regex doesn't match.The regex [^0-9] checks if not digit.
JSFIDDLE
Here is the code:
$(function() {
$('input').bind('keyup', function(event) {
var currValue = $(this).val();
if (currValue.search(/[^0-9]/) != -1) {
alert('Only numerical inputs please');
}
$(this).val(currValue.replace(/[^0-9]/, ''));
alert($(this).val());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<label>Digits Only:
<input type="text" />
</label>
<br>
<br>
EDIT :
In input type="number" we have to force it to always accept the updated val since many events does not work in it.So for that reason I have to update the existing value with the updated value after each event.
So I added
var v = $(this).val();
$(this).focus().val("").val(v);
So that each time the input is focused the value get updated with the existing value.
UPDATED FIDDLE FOR INPUT TYPE NUMBER
Updated snippet:
$(function() {
$('input').bind('keyup input', function(event) {
var v = $(this).val();
$(this).focus().val("").val(v);
var currValue = $(this).val();
if (currValue.search(/[^0-9]/) != -1) {
alert('Only numerical inputs please');
}
$(this).val(currValue.replace(/[^0-9]/, ''));
alert($(this).val());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label>Digits Only:
<input type="number" />
</label>
<br>
<br>
EDIT 2 : For special case + and -.I think its a bug I am not sure but check the below snippet.It works for all the cases.Hope it helps.
FINAL FIDDLE
$(function() {
$('input').bind('keyup', function(event) {
var v = $(this).val();
$(this).focus().val("").val(v);
var currValue = $(this).val();
$(this).val(currValue.replace(/[^0-9]/, ''));
alert(v);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label>Digits Only:
<input type="number" name="test" min=0 save="" oninput="validity.valid ? this.save = value : value = this.save;">
</label>
<br>
<br>
Hope it helps.For any other doubt feel free to ask.

Replace part of value by incrementing it

I have a set of inputs which can be duplicated, but I then need to increment the array value of them. How do I do this?
<input type="text" name="person[0][name]">
<input type="text" name="person[0][age]">
This can then be duplicated, but I need to change the new inputs to be like:
<input type="text" name="person[1][name]">
<input type="text" name="person[1][age]">
I have got so far:
cloned.find('input, select').each(function(){
var $this = $(this);
$this.attr('name',
$this.attr('name').match(/\[\d+]/g, '[' + what_goes_here + ']')
);
});
Where cloned is my last group of inputs.
What do I do with the value of what_goes_here?

You can use .match() with RegExp \d+, + operator, .replace()
cloned.find('input, select').each(function() {
var $this = $(this);
var n = $this.attr('name').match(/\d+/)[0];
$this.attr('name', $this.attr('name').replace(n, +n + 1));
});

How can I change a part of input's name via jquery?

I have such code in my view:
<div class="box">
<input type="text" name="product[size_ids][<%= size.id %>][quantity][1]" readonly class="product_quantity" placeholder="quantity from" value="1">
</div>
In my js I'd like to change [1] into [2] or [3] and so on after [quantity], depending on how many additional forms I create. How can I do that?
This is what I have in my JS:
var i = 1
$('.add_another_price_btn').click( function (e) {
e.preventDefault();
$(this).prev().clone().insertBefore($(this));
$(this).prev().find('.remove_another_price_btn').show();
$(this).prev().find('.product_quantity').removeAttr('readonly');
$(this).prev().find('.product_quantity').attr('value', '');
//This is what I tried, but it doesn't work properly.
$(this).prev().find('.product_quantity')
.attr('name', function() { return $(this).attr('name') + '['+ (i++) + ']' });
$('.remove_another_price_btn').click( function (ee) {
ee.preventDefault();
$(this).parent().parent().remove();
});

You can do a simple string operation with substr and lastIndexOf to replace the last part of the name.
// get input and name of input
var input = $("input");
var name = input.attr("name");
// change just the last part
name = name.substr(0, name.lastIndexOf("[")) + "[2]";
// set name back to input
input.attr("name", name);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="product[size_ids][<%= size.id %>][quantity][1]" readonly class="product_quantity" placeholder="quantity from" value="1">

Save the clone
Break the name using substring or split and parseInt
Like this
var $clone = $(this).prev().clone(),
$prodQ = $clone.find('.product_quantity'),
name = $prodQ.attr("name"),
parts = name.split("quantity]["),
newName = parts[0]+"quantity][",
num = parseInt(parts[1],10); // or a counter
num++;
newName += num+"]";
$prodQ.removeAttr('readonly').attr('value', '').attr('name',newName);
$clone.insertBefore($(this));
$clone.find('.remove_another_price_btn').show();

Get multiple elements by a list of id's with jQuery

I have that in my html
<input type="checkbox" id="1234">
<input type="checkbox" id="2345">
<input type="checkbox" id="3456">
<input type="checkbox" id="4567">
<input type="checkbox" id="5678">
And an list of id 1234 2345 3456 or #1234 #2345 #3456
I want to get all the element of the list whose id is in the list of id
I try $(":checkbox").attr('id', items_id); and var items_cb = $(":checkbox[id='items_id']"); where items_id is the list of item, but it doesn't work.

Just try to put all id's in selector separated by comma:
$('#1234, #2345, #3456')...
Code: http://jsfiddle.net/3df6W/
P.S. ID's shouldn't start with digits.

Try this
$('#1234, #2345, #3456')

You can use the jQuery each method that will loop through all the selected elements.
HTML
<input name="myradio" type="checkbox" id="colour1">
<input name="myradio "type="checkbox" id="colour2">
<input name="myradio" type="checkbox" id="colour3">
JavaScript
$('input:radio[name=myradio]').each(function (index) {
alert(index + ': ' + $(this).val()); //is it checked?
alert(index + ': ' + $(this).attr('id')); //ID string
//You can compare if is this ID in items_id in this loop
});

var arr = ['1234', '2345', '3456'];
var elem = [];
$('body > input').filter(function() {
if ($.inArray(this.id, arr) != -1) {
elem.push({
id: this.id,
type: $(this).prop('type'),
name: this.nodeName
});
}
});
console.log(elem);
console.log(elem.length);

you can just build a selector string like :
var selectorString = '';
for id in idList:
selectorString = '#' + idList[id] + ',';
then you can use the selectorString as :
$(selectorString)
to select them.

var result = [];
for(var i=0; i < items_id.length; i++){
var id = items_id[i];
result.push($(id))
}
// result is what you want

$("#1234, #2345, #3456")
...should work.
http://api.jquery.com/multiple-selector/