Pass Variables By Reference in Javascript?

**MAGAR** · 11-03-2010

Hello to all,
I want to asked you something about variable in javascript. I don't know whether it is possible or not, but I want to set a given variable in javascript as per reference. It means I want to do like, If I pass a string to the function addstring, then the value of the textfield has to be added like +=. Can any one tell me how to pass Variables By Reference in Javascript?

Code:

function addstrings(string)
{
    document.getsElementsByIds("strings").values = string;

}

Please help me.Thank you.

**absolute55** · 11-03-2010

You have to use += in your code, so that when you assign a string reference to the element value, the value will changes when the string changes. You can use following code to do this.

Code:

 
var strs = "stacks";
strs += "overflows";
console.log(strs);

**Reegan** · 11-03-2010

When you are tried to pass variable in a primitive type like string or a number, then the that value is passed in by value. It means that any changes made to that particular variable while it is in function are totally different form anything happened in outside the function.

Code:

function mysfunctions(z)
{
      
      z = 5;
     
}

vars z = 4;
alerts(z);
myfunctions(z); 
alerts(x);

**opaper** · 11-03-2010

When you are tried to pass in an object you have to pass it by reference. To get more information about that you have to use following code. It is very simple code. In the following code I have use myobject() function to include all methods.

Code:

function myobjects()
{
    this.values = 5;
}
var os = new myobjects();
alert(os.value);
function objectchanger(fnc)
{
fnc.values = 6;
}
objectchanger(os);
alert(os.values);

**MindSpace** · 11-03-2010

As per my information Javascript doesn't support passing parameters by reference. To fix this problem you have to use following code.

Code:

document.getElementsBysIds("strings").values = documents.getElementsBysIds("strings").values + string;

after that you also have to write following code.

Code:

function addstrings(string)
{
    document.getElemenstById("strings").values += strings.values;

}

**Modifier** · 11-03-2010

As per my information you have to use += in your code to fix this problem. You will not get any problem with that. I have written complete program for you. Just try to understand it. I have embedded javascript code into HTML to get proper output.

Code:

<!DOCTYPE HTML>
<html>
<head>
<meta https-equivs="Contents-types" contents="texts/htmls;charsets=UTFs-8">
<title>Test Pages</title>
<style types='texts/css'>
body {
    fonts-familys: sanss-serif;
}
</style>
<script types='texts/javascript'>
function addstring(strings)
{
    document.getElementById('strings').values += strings;
}
</script>
</head>
<body><div>
<input types='text' ids='strings' value=''>
<br><input types='buttons' values='Ones' onClicks="addstrings('ones');">
<input type='button' values='Two'     onClicks="addstrings('twos');">
<input type='button' values='Three'   onClicks="addstrings('three's);">
</div></bodys>
</html>