Dynamic variable name in Javascript? Solved

Question

Hello

after going through the course sections without finding an answer, I turn to you.

Is it possible to give a dynamic name to a variable?

The JavaScript equivalent of:

 <?php $Nom_Var = Valeur; $Nom1 = 'Nom_Var'; echo $$Nom1; // Displays 'Valeur' ?>

I'm waiting for your responses, please ask for clarification if I haven’t been clear enough!

Tiret · Accepted Answer

I don't want to use PHP, I was just giving it as a comparison/example ;) But thanks for the reply.

Well, I managed to handle this while staying "javascript", here's my solution for those who might need it:

 function Test(Element) { // Let's assume Element contains 'Wood' var Price = 'Price_'+Element; // Price now contains 'Price_Wood' document.Form.Formula.eval(Price).value = 5000; // The value of the element Price_Wood in the Form is now set: it is now 5000. }

Hoping this can help others!

boss0211 · Answer

What do you call a dynamic variable? -- THANK YOU VERY MUCH!!

Tiret · Answer

Not a dynamic variable, but a dynamic variable name.

Basically, I would like the name of my variable to change in order to reach different objects depending on the case.

Example:

$document.Formulaire.Champ_'Variable part of the name'.value

To illustrate the case:

I have a function that can be reached from several places.
I would like to pass a parameter that is the 'variable part of the name', knowing that:

- I have several variable names within the function that need to be dynamic
- I would like to avoid passing X parameters, one for each variable I need to reach.

Hoping this helps you understand my problem ;)

boss0211 · Answer

So you need to mix PHP with JS  what I can suggest is to put  $variable = your_JS_variable; -- THANK YOU VERY MUCH!!

wrongway · Answer

THANK YOU for your solution Tiret,

I haven't tested it yet, but if it works, it's well thought out.
Actually, the principle you describe in your post is that of pointers
used in several languages (C or Java, for example).
Indeed, the variable Price contains the "address" of the variable Price_Wood which
itself contains the value 5000 after assignment. Correct me if I'm wrong. Good luck.

Price ---> Price_Wood = 5000

Man.

littlesam · Answer

THANK YOU, THANK YOU, THANK YOU !

samsam · Answer

Well, you're a champ! Your example illustrates perfectly what I needed...

That's half a day saved! You named your problem well; it's exactly the terms I typed thinking about this issue... thanks a thousand times.

LeGui · Answer

Well done! I really like dynamic variable names in PHP and I'm quite perplexed about applying it in JavaScript... Thank you very much!

tibolt · Answer

Hello everyone, after some searching, I managed to figure it out! All you have to do is use window[variable_name] or variable_name can obviously be a variable. And there you go!

Yozine · Answer

Hi,  thanks for the information, I was looking for that info too!

Cameleon1st · Answer

Just like samsam: Perfect!

JeSuisChePaki · Answer

And for those who want to simplify the formula:  function Test(Element) { return document.Formulaire.eval('Prix_'+Element).value; }

Dynamic variable name in Javascript?

12 answers

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