Creating a variable that is named after an existing variable

Creating a new variable with a dynamic name can be tricky. Let's take a look at an example:

function preloader(imglist) {

  var imgs = imglist.split("|");

    for (i in imgs) {

      var img_{i} = new Image;  
      img_{i}.src = imgs[i];    

    }
}

preloader("asd.jpg|qwe.jpg|dorama.png");

I attempted to use arrays, but encountered some challenges.

var qwe = new Array();
qwe[1] = "asd";

var qwe[1] = new Image; 

In PHP, you have more flexibility when it comes to naming variables dynamically:

$var1 = "test";
$var2_{$var1} = "test last";
echo $var2_test;
echo $var2_{$var1};

Answer №1

There is no need to perform that action here, as each Image can be saved and replaced to achieve the same preloading effect. However, simply doing this will suffice:

function imagePreloader(imageList) {
  var images = imageList.split("|");
  for (var i=0; i<images.length; i++) {
    new Image().src = images[i];
  }
}

It's important to note that I have switched from using a for in loop to a standard index-based for loop when looping through an array (rather than enumerating). For more information on this topic, check out the insightful explanation provided by CMS in their response here.

Answer №3

If you want to reach your objective, consider utilizing the Eval() function in the code snippet below:


var data = "testVariable";
eval("var temp_" + data + "= new Array();");
temp_testVariable[temp_testVariable.length]="Hello World";
alert("Array Length: " + temp_testVariable.length);
alert("Array Data: " + temp_testVariable[0]);

It's important to note that this may not be the optimal solution. I'm simply sharing this as an option.

For further insights, check out this article which discusses the aforementioned example and an alternative approach using the Window object.

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