I trying to get cursor position inside input field, which is type number
<input type="number" id="myInput">
And I tried standard selectionStart property, but apparently it does not work for number fields.
var start = document.getElementById("myInput").selectionStart;
Is there any why or workaround to get that information inside keypress event?
My end goal is it prevent leading zeros in such input field, for that I need to know is user input coming to start of existing value.
Currently I stripping those zeros in keyup event:
var inputFieldValue = $(this).val();
$(this).val(removeLeadingZeros(inputFieldValue)); // removeLeadingZeros: inputString.replace(/^0+/, "");
But with that solution those zeros became visible for a second before been removed,
that behavior I want to prevent.
Any ideas? How I can get end result string before it provided to user inside input element? Even as selectionStart value not available for number input, browser somehow know where to put those new characters, so there must be some way to capture that and may be prevent some default behavior or stop bubbling.
You can try RegExp
<input type="number" id="myInput">
$("#myInput").on("input", function() {
if (/^0/.test(this.value)) {
this.value = this.value.replace(/^0/, "")
}
});
Previously I have done a useful function for user to auto populate dashes after a length of string.
To understand my scenario :
I have a text box for user to key in Mobile No.
To make the value inserted is the same format, I code a script to auto insert a dash a length of char.
The problem is, whenever I want to erase the inserted value, the script wont allow me as it auto populate the dash after a length of
string unless I press the "backspace" longer then only I can erase
the inserted value.
Here is my script for the auto inserted dash :
$(document).ready(function() {
$("input[name$='Mobile No. Text Box']").keyup(function(){
if ($(this).val().length == 5){
$(this).val($(this).val() + "-"); }
}); });
and here is the image of the text box
Mobile No. Text Box
Please help, Thank You.
Regards
Try adding a Validation to avoid adding the "-" when user presses the backspace
$(document).ready(function() {
$("input[name$='Mobile No. Text Box']").keyup(function(e){
if ($(this).val().length == 5 && e.which != 8){
$(this).val($(this).val() + "-"); }
}); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input name="Mobile No. Text Box">
There are plenty libraries out there which can help you with this problem. I personally recommend this one https://github.com/text-mask
You can read through plain vanilla JavaScript usage right here https://github.com/text-mask/text-mask/tree/master/vanilla#readme
I believe its first example is a basic phone-number input which is exactly what you are looking for.
I have a form where a user will set up a new Username. The issue is user's have been creating username's with a space and I want to avoid that.
I have been able to detect when there is a space using the following:
var hasSpace = $('#usernameValue').val().indexOf(' ')>=0;
However I cannot figure out to have the form check for that space when the user is typing in that input section.
How would I change my code to do this?
Thank you!
As suggested you can use the keyup function. This example checks if you entered space and alerts the user
$('#usernameValue').keyup(function(e) {
if (e.which === 32) {
alert('you entered space');
// Do whatever logic is needed here
}
});
Working JsFiddle
Are you using an input tag?
If so, you can use the pattern attribute to define a regular expression that doesn't accept whitespaces. For example:
<input type="text" name="username" pattern="/^\S*$/">
For more information: https://www.w3schools.com/tags/att_input_pattern.asp.
Using onkeyup event.
input.onkeyup = function(){
var hasSpace = $('#usernameValue').val().indexOf(' ')>=0;
}
Is there a possiblity to force an iOS-device to show the numeric keyboard while using a custom pattern as input type?
my input pattern:
<input id="price" class="numeric" pattern="\d+((\.|,)\d{1,2})?" name="price"
title="" data-mini="true" data-clear-btn="true" autocomplete="off" autofocus />
I want to type a currency value like '14.99' and show up a keyboard with access to numbers on the iOS device
<input type='number' />
<input pattern='[0-9]*' />
<input pattern='[\d]*' />
are all missing the decimal sign and/or are not validating as number when adding a decimal sign. An alternative way could be a javascript function which is creating the decimal sign on the right place, like pressing 1->2->9->9 in this order creates on keypress() 0.01->0.12->1.29->12.99,
but this requires the input field to be type='text' --> obvious problem here is that the text keyboard is showed when focussing the input field.
How can I solve this issue?
EDIT
Environment:
JQM 1.3.2
jquery 1.8.2
For now, JavaScript is the only solution. Here's the simplest way to do it (using jQuery):
HTML
<input type="text">
JavaScript
$('input[type="text"]').on('touchstart', function() {
$(this).attr('type', 'number');
});
$('input[type="text"]').on('keydown blur', function() {
$(this).attr('type', 'text');
});
The idea is simple. The input starts off and ends up with type="text", but it briefly becomes type="number" on the touchstart event. This causes the correct iOS keyboard to appear. As soon as the user begins to enter any input or leave the field, the input becomes type="text" once again, thus circumventing the validation.
There's one downside to this method. When the user returns to an input that has already been filled out, the input will be lost (if it doesn't validate). This means the user won't be able to go back and edit previous fields. In my case, this isn't all that bad because the user may want to use the calculator over and over again with different values, so automatically deleting the input will save them a few steps. However, this may not be ideal in all cases.
It looks like Mobile Safari supports the new HTML5 input type attributes of email, number, search, tel, and url. These will switch the keyboard that is displayed. See the type attribute.
So for example, you could do this:
<input type="number" />
And when the input box has focus, the number keyboard is shown (as if the user had the full keyboard and hit the "123" button.
If you really only want numbers, you could specify:
<input type="tel" />
And then the user would get the phone number dialing keypad.
I know this works with Mobile Safari -- I only assume it will work with UIWebView.
http://conecode.com/news/2011/12/mobile-safari-uiwebview-input-types/
I made this little snippet to achieve what you want and I've tested it on iPhone 5 v7.0.3
I used e.which to read CharCode entered and then push it into an array (before) which represents digits before decimal mark and another array (after) to move values from (before) array past the decimal mark.
It might look complicated, due to my humble programming skills.
1) Code demo - 2) Currency conversion demo
HTML:
<input type="tel" id="number" />
JS
Variables and functions:
// declare variables
var i = 0,
before = [],
after = [],
value = [],
number = '';
// reset all values
function resetVal() {
i = 0;
before = [];
after = [];
value = [];
number = '';
$("#number").val("");
$(".amount").html("");
}
// add thousand separater
function addComma(num) {
return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
Main code:
// listen to keyup event
$("#number").on("keyup", function (e, v) {
// accept numbers only (0-9)
if ((e.which >= 48) && (e.which <= 57)) {
// convert CharCode into a number
number = String.fromCharCode(e.which);
// hide value in input
$(this).val("");
// main array which holds all numbers
value.push(number);
// array of numbers before decimal mark
before.push(value[i]);
// move numbers past decimal mark
if (i > 1) {
after.push(value[i - 2]);
before.splice(0, 1);
}
// final value
var val_final = after.join("") + "." + before.join("");
// show value separated by comma(s)
$(this).val(addComma(val_final));
// update counter
i++;
// for demo
$(".amount").html(" " + $(this).val());
} else {
// reset values
resetVal();
}
});
Reset:
// clear arrays once clear btn is pressed
$(".ui-input-text .ui-input-clear").on("click", function () {
resetVal();
});
Result:
I think that you can use the same approach that I suggested to Ranjan.
Using a textfield like a buffer. First you need to detect when the keyboard appears and check if the first responder is the webview. Then you become a textview as the first responder.
When you are setting the text inside the input of the webview, you can add some logic to validate the number.
Here is a link of my example project with the solution, in your case you don't need change the inputView. But the approach is the same, use a Man in the middle.
Cant comment on https://stackoverflow.com/a/19998430/6437391 so posting as a separate answer...
This is the same idea as https://stackoverflow.com/a/19998430/6437391 but instead of switching the type, its the pattern that's switched.
This has the effect of not clearing the value on the textfield on focus when value does not match numeric format, for example, if the value has separators( 1,234.56 ).
$('input[type="text"]').on('touchstart', function() {
$(this).attr('pattern', '[0-9]*');
});
$('input[type="text"]').on('focus', function() {
$(this).attr('pattern', actualpattern);
});
I want to set the maximum length of character for my texteditor. Users will enter text in Iframe in the editor. I am getting the characters through the keydown event.
I get the "maxlength" by calculating length with text & maxlength and by setting keyflag as false.
My problem is that I now have to allow the user to edit text when user press backspace, delete, ctrl+special keys.
Is there any other general ways to achieve the maxlength property?
You can do as follows once it reaches to max limit
var text = $('#editor').text().substring(0,maxlength);
text you can add to your editor as a value
Dudes finally i done it..
On keyDown event and using keycodes we can achieve these functions...
keydown(e)
{
if(e.keyCode==8) //for backspace key
{
// your code
}
}
like wise we can write our required functions