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Questionhow to convert a function in to arrow function Pin
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QuestionReplacing the eval() function with something faster, more safe Pin
jkirkerx21-Dec-20 7:52
professionaljkirkerx21-Dec-20 7:52 
This is part of the old PHP 4.7 App that I'm working on. The last time somebody worked on it was back in 2008, so there is a lot of old outdated stuff in it. One of them is this eval() function.

I read up on it, but I'm still kind of fuzzy on the point of it. If I understand correct, it evaluates the notion of an equation, or string, and returns the outcome if it can be done, or undefined if it can't be done. And then the Mozilla documentation said "Don't use it", and offered work around solutions such as using a function instead.

Looking at this block of JavaScript, I'm having trouble with understanding why it was written this way, and coming up with a rewrite.

So like on Ref 1, it must be a select option element, and it getting the value.
I would think document.getElementByID('document.step2.' + txt + '.value') would be a good replacement, and then check if the element is undefined.

And Ref 2 is thew same thing.

Mozilla says this, in which I get, but confuses me because my eval() is being used different.
I just need help in understanding, and if I am interpreting this correct.
Wrong
function looseJsonParse(obj){
    return eval("(" + obj + ")");
}

Right
function looseJsonParse(obj){
    return Function('"use strict";return (' + obj + ')')();
}
JavaScript
function save(bkType, txt, id , dataType) {        

    let error = false;
    let typeVar = eval('document.step2.' + txt + '.value'); // Ref 1
    let referenceId = '';
    let refDetail = '';
    let quantity = '';

    // Whether to post msrp.phtml or not
    const fPost = true;

    if ('Q' == bkType) {

        typeVar = 'document.step2.' + id + '\$quan' + '.value';
        quantity = eval(typeVar); // Ref 2

    }
    else if ('TQ' == bkType)  {

        typeVar = 'document.step2.' + id + '\$quan' + '.value';
        quantity = eval(typeVar);
        typeVar = 'document.step2.' + id + '\$type' + '.value';
        referenceId = eval(typeVar);

        if ('quan' != data_type)  {

            var typeOptions = eval('document.step2.' + txt + '.options');
            FilterInactivePart(typeOptions);

        }

    } 
If it ain't broke don't fix it
Discover my world at jkirkerx.com

AnswerRe: Replacing the eval() function with something faster, more safe Pin
Graham Breach21-Dec-20 8:27
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Questionhigher order functions Pin
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QuestionAttempting to pre-populate text field and mailto based on ID Pin
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QuestionLooking to run a PHP page in the background using pure Javascript Pin
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