What is wrong in this string concatenation using JavaScript?

Question

I am pretty new in JavaScript development and I am finding some problem concatenating 2 strings.

So, I done:

alert(value);
var pagina = string.concat("edi.do?serv=3.C&ids=", value);
alert(pagina);

The alert(value) show me the aspected result that is something like: 68661-68662 but the second alert don't show the value of the pagina variable so I think that something is going wrong in the concatenation.

What am I missing? How can I fix this issue?

I need to obtain a string like: edi.do?serv=3.C&ids=68661-68662

Tnx

Marius · Accepted Answer · 2015-02-10 10:18:18Z

6

How about simply doing:

var pagina = "edi.do?serv=3.C&ids=" + value;

answered Feb 10, 2015 at 10:18

Marius

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1 Comment

Gogol Over a year ago

Overkill is the term that came to my mind after seeing the question. This answer should have been accepted by now:)

wsc · Accepted Answer · 2016-01-28 06:01:33Z

2

var value = "68661-68662";
var pagina = "edi.do?serv=3.C&ids=" + value;
alert(pagina);

answered Jan 28, 2016 at 6:01

wsc

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Comments

Wim Mostmans · Accepted Answer · 2015-02-10 10:19:57Z

1

You are mixing up Java with JavaScript. Contact in javascript is done like this:

var pagina = "edi.do?serv=3.C&ids=" + value;

answered Feb 10, 2015 at 10:19

Wim Mostmans

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Comments

tf.alves · Accepted Answer · 2015-02-10 10:21:11Z

1

The problem is that "string.concat" is a null pointer, what is "string" in your context? The "string" variable should be the original string.

I guess what you are trying to achieve is:

var pagina = "edi.do?serv=3.C&ids=".concat(value);

You can also do as Marius suggested:

var pagina = "edi.do?serv=3.C&ids="+value;

answered Feb 10, 2015 at 10:21

tf.alves

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Comments

user3233318 · Accepted Answer · 2015-02-10 10:25:57Z

1

To access string methods in JavaScript we use Object oriented design like this: "123".concat("456")

Also note that the class is represented by String, not string.

answered Feb 10, 2015 at 10:25

user3233318

Comments

Benjamin · Accepted Answer · 2015-02-10 10:32:30Z

1

Although there are many acceptable answers here, I want to point out that one unmentionend method of concatenating strings in JavaScript is using Array's join() method:

var pagina = ["edi.do?serv=3.C&ids=", value].join();

answered Feb 10, 2015 at 10:32

Benjamin

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