CODEWITHSUNDEEP
javascripthtml
Aaron B
Aaron B

Reputation: 33

How to remove a Zero if it is the first digit?

This is my first attempt at making a javascript and I've only started learning about 2 weeks ago, so bare with potential newbishness. Im basically just trying to convert an international number to what needs to be actually dialed.

I need to figure out how to remove a leading zero from the phonenumber variable and no other zeros. Ive seen answers on this that involve parseInt and other solutions but I cant figure out how to implement them.

<script>
var countrycode = document.getElementById("country").value;
var phonenumber = document.getElementById("phnm").value;
function updatecountrycode() // Updates country code on user change //
 {countrycode = document.getElementById("country").value;}
function updatenumber() // Updates phone number on user input //
 {phonenumber = document.getElementById("phnm").value;}
function fullnumber() // Displays country code + phone number //
document.getElementById("output").innerHTML = 9011 + countrycode + phonenumber};
</script>
<form>
Choose the country you want to call
<select id="country" onchange="updatecountrycode();">
<option>Choose Country</option>
<option value="44" id="uk">United Kingdom</option>
<option value="353" id="ire">Ireland</option>
</select>
<br>
<br>
Enter Phone Number
<input type="text" id="phnm" onchange="updatenumber()"><br>
</form>
<button type="button" onclick="fullnumber()">complete number will display</button>
<p id="output">test</p>

Upvotes: 3

Views: 3118

Answers (4)

TayabRaza
TayabRaza

Reputation: 51

Sorry I know I am late on this question but I think this question is still relevant for some users, so I would like to share a simple function which I have created to remove zero for a text box.

To use this function simply parse your value as an argument in this function i.e removeZero(yourValue)

function removeZero(v) {
    if ( v.charAt(0) == 0 ) {
        return v.slice(1);
    }
}

Upvotes: 0

Zohaib Ijaz
Zohaib Ijaz

Reputation: 22875

I created a fiddle for you. https://jsbin.com/dotoha/edit?html,js,output

parseInt solution works fine, because e.g. praseInt('032132323') will produce 32132323 and for multiple leading zeros it will work as well

e.g. parseInt('0003434344434') will give 3434344434

var countrycode = document.getElementById("country").value;
var phonenumber = document.getElementById("phnm").value;

function updatecountrycode() {
  // Updates country code on user change //
  countrycode = document.getElementById("country").value;
}

function fullnumber() {
  // Displays country code + phone number //
  var phonenumber = document.getElementById("phnm").value;
  document.getElementById("output").innerHTML = 9011 + countrycode + parseInt(phonenumber);
}

Upvotes: 0

Stan Shaw
Stan Shaw

Reputation: 3034

JavaScript:

var PhoneNumber = "0545";
var PhoneNumber = parseInt(PhoneNumber, "10");

Problem solved. The second parameter for parseInt (10) is to indicate a decimal based number (default is 8-based). But, parsing your number as an integer will easily remove leading zeros - and you don't have to worry about substrings or if statements.

Upvotes: 0

Russ
Russ

Reputation: 4163

A simple solution:

if (phonenumber.substr(0,1) == "0")
{
    phonenumber = phonenumber.substr(1);
}

Upvotes: 4

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