Here's the scenario:
"var jsonData={first:{name:'John', age:30}};"
I am looking to instantiate an object from this string,
The standard JS eval function works perfectly for this purpose, however, when attempting to use $eval I encounter "ReferenceError: jsonData is not defined" and Angular restricts my usage of $eval only to the controller.
Any suggestions on how I can accomplish this task?
Many thanks
Looking for the solution? Check out this post: Angular.js: How does $eval work and why is it different from vanilla eval?
When it comes to AngularJS, $eval and $parse handle AngularJS expressions, not JavaScript code. To understand the distinction between expressions and regular JavaScript, refer to the documentation provided in the link.
I personally tested the expression evaluator for angularjs 1.0.8+ on the reference page. It performed smoothly without any errors. If you need to assign data to a key like `scope.config`, simply skip using the keyword `var`.
"config={general:{instance:'livedemo'}}"
Angular's $eval function is specifically designed to evaluate angular expressions, not general JavaScript code. This typically refers to the expressions used in your HTML like {{expression}}.
When deciding whether to use eval, it's important to consider the source of the string you are evaluating. If you have complete control over it, using eval may be acceptable. However, if there are any doubts about its safety, it's recommended to try parsing the string.
If the string within the curly brackets {} follows proper JSON format, for example:
{"general": {"instance": "livedemo"}}var s = "var config={general:{instance:'livedemo'}};";
var m = s.match(/var (.*)=({.*})/);
var varname = m[1]; // "config"
var data = JSON.parse(m[2]); // {general: ...}
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