How can I use string argument input as a part of variable name in a Javascript? I want to do that because it seems to be tedious to define getter and setter for all the fields... while most of the fields have similar names.

For example,

var random = {
    this.input1_field : null,
    this.input2_field : null,
    set: function(name,field){
       this.name_field = field;   
    }
}

where I want name_field to be dynamic based on the input variable 'name'. (ex, name="input1" or name="input2" etc)

How can I use string argument input as a part of variable name in a Javascript? I want to do that because it seems to be tedious to define getter and setter for all the fields... while most of the fields have similar names.

For example,

var random = {
    this.input1_field : null,
    this.input2_field : null,
    set: function(name,field){
       this.name_field = field;   
    }
}

where I want name_field to be dynamic based on the input variable 'name'. (ex, name="input1" or name="input2" etc)

• javascript

Share Improve this question Follow asked May 22, 2011 at 21:26 user482594user482594 17.5k2323 gold badges7676 silver badges114114 bronze badges 1

• I don't think you can write this.input1_field like that. Surely that's a syntax error? And why to you want to define a getter and a setter? Sounds like a bad habit ing from Java. – Zecc Commented May 22, 2011 at 22:28

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2 Answers 2

Sorted by: Reset to default 8

this[name + "_field"] = field

You can just pass in a string and use it.

this["input1_field"] === this.input1_field

If your variable has been declared as global, you could do something like this:

var myVar = 5;
var myString = "myVar";

function anyFunc(str){
    return window[str];
}

anyFunc(myString); // Outputs 5

If this variable is local, you could follow the same procedure using the pointer this instead of window.