Running JavaScript code contained within a string

I have a unique scenario where I am handling a JavaScript code that is generated server-side and passed to the client as a string via a REST request. My goal is to execute this retrieved code successfully. Any assistance on how to approach this would be highly appreciated.

On the server-side, we have the JavaScript code stored as a string.

(function() {

function createVisual(selector) {
    $(selector).visualize({
        chart: {
            type: 'bar',
        },
        xAxis: {
            crosshair: true,
            type: "category"
        },
        yAxis: {
            min: 0,
            title: {
                text: null
            }
        },
        dataSeries: [{

            dataset: data    
        }],
    });
}

function displayGraphics() {
    createVisual('#visual');
}
return {
    render: displayGraphics
}
}())

On the client side (using AngularJS)

    .controller('GraphController', ['$scope', 'graphs', function ($scope, graphs) {

        var script = graphs.info; // contains the JavaScript code obtained from a REST request
        eval(script); 
        script.render(); 

}])

When attempting to execute the script on the client-side, an error message of "script.render is not a function" is displayed in Chrome.

If you have any insights or advice on resolving this issue, please feel free to share them.

Your help is greatly appreciated.

Answer №1

Avoid using the eval function to execute JavaScript code as it can pose a significant security risk.

The use of eval is discouraged because it opens up the possibility for executing malicious code from an external source. Check out this question for more insights on why eval should be avoided.

Answer №2

Utilize the following:

let outcome = compute(test); 
outcome.display(); 

Due to the fact that your test variable is a string, the output of compute(test) will be a function.

It is generally advised against using eval. However, in case it is necessary, consider using angular's $eval method instead:

If you find yourself needing to evaluate an Angular expression, opt for the $eval() function.

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