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Is there a way to find JavaScript variable on the page (get it as an object) by its name? Variable name is available as a string constant.
928
Use bracket notation to get an object's value by a variable key, e.g. obj[myVar] . The variable or expression in the brackets gets evaluated, so if a key with the computed name exists, you will get the corresponding value back.
Use the typeof operator to get the type of an object or variable in JavaScript. The typeof operator also returns the object type created with the "new" keyword.
var is the keyword that tells JavaScript you're declaring a variable. x is the name of that variable. = is the operator that tells JavaScript a value is coming up next. 100 is the value for the variable to store.
Example: var MyVariable = "Value of variable"; function readValue(name) { .... } alert(readValue("MyVariable"));
<script> var a ="test"; alert(a); alert(window["a"]); alert(eval("a")); </script> All JS objects (which variables are) are available within their scope as named properties of their parent object. Where no explicit parent exists, it is implicitly the window object.
i.e.:
var x = 'abc'; alert(window['x']); //displays 'abc' and for a complex object:
var x = {y:'abc'}; alert(x['y']); //displays 'abc' and this can be chained:
var x = {y:'abc'}; alert(window['x']['y']); //displays 'abc' If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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