how to check if all object keys has false values

This is a very simple solution that requires JavaScript 1.8.5.

Object.keys(obj).every((k) => !obj[k])

Examples:

obj = {'a': true, 'b': true}Object.keys(obj).every((k) => !obj[k]) // returns falseobj = {'a': false, 'b': true}Object.keys(obj).every((k) => !obj[k]) // returns falseobj = {'a': false, 'b': false}Object.keys(obj).every((k) => !obj[k]) // returns true

Alternatively you could write

Object.keys(obj).every((k) => obj[k] == false)Object.keys(obj).every((k) => obj[k] === false)  // or thisObject.keys(obj).every((k) => obj[k])  // or this to return true if all values are true

See the Mozilla Developer Network Object.keys()'s reference for further information.

This will do the trick...

var result = true;for (var i in saver) {    if (saver[i] === true) {        result = false;        break;    }}

You can iterate objects using a loop, either by index or key (as above).

If you're after tidy code, and not repeating that then simply put it in a function...

Object.prototype.allFalse = function() {     for (var i in this) {        if (this[i] === true) return false;    }    return true;}

Then you can call it whenever you need, like this...

alert(saver.allFalse());

Here's a working sample...

Object.prototype.allFalse = function() {     for (var i in this) {        if (this[i] === true) return false;    }    return true;}var saver = {        title: false,        preview: false,        body: false,        bottom: false,        locale: false};console.log("all are false - should alert 'true'");console.log(saver.allFalse());saver.body = true;console.log("one is now true - should alert 'false'");console.log(saver.allFalse());