René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ngChange handler called, on submit, for blank type=\"number\" fields, when they haven't changed","articleBody":"I suppose this doesn't meet the LTS definition of a critical bug.\r\nBut I am going to file it here in case it is - at the very least - helpful to other people.\r\n\r\nI spent a lot of time tracking down this issue.  It's confusing and non-obvious why this would happen.\r\n\r\n\r\n**I'm submitting a ...**\r\n\u003c!-- (check one with \"x\") --\u003e\r\n- [ ] regression from 1.7.0\r\n- [ ] security issue\r\n- [ ] issue caused by a new browser version\r\n- [x] other \u003c!--(Please do not submit support requests here - see above)--\u003e\r\n\r\n\r\n**Current behavior:**\r\n\r\nIf you initialise, or clear a `\u003cinput type=\"number\"\u003e` field to blank (ie `\"\"`).  It's `ng-change` handler will always be called on submit.  Even if it has not been changed.\r\n\r\n\r\n**Expected / new behavior:**\r\nChange handler does not get called.\r\n\r\n**Minimal reproduction of the problem with instructions:**\r\nAn example\r\n```\r\n\u003cscript src=\"https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js\"\u003e\u003c/script\u003e\r\n\r\n\u003cdiv ng-app=\"app\"\u003e\r\n  \u003cdiv ng-controller=\"MainCtrl\"\u003e\r\n    \u003cform ng-submit=\"submit()\"\u003e\r\n      \u003cinput type=\"number\" ng-model=\"form.testNumber\" ng-change=\"changed()\"/\u003e\r\n      \u003cbutton type=\"submit\"\u003eSubmit\u003c/button\u003e\r\n    \u003c/form\u003e\r\n  \u003c/div\u003e\r\n\u003c/div\u003e\r\n````\r\n```\r\nvar app = angular.module(\"app\", []);\r\n\r\napp.controller(\"MainCtrl\", function ($scope) {\r\n    $scope.form = {\r\n      testNumber: \"\"\r\n    };\r\n\r\n    $scope.changed = function () {\r\n        console.log(\"changed\");\r\n    };\r\n\r\n    $scope.submit = function () {\r\n        console.log(\"submitted\");\r\n    };\r\n});\r\n```\r\nsee: http://jsfiddle.net/6qxrygzm/1/\r\n\r\nClick the submit button in the demo.  The console will log the message \"changed\" even though the field is untouched from its initialised value.\r\n\r\n**AngularJS version:** 1.8.2\r\n\r\n**Browser:** all | Chrome 98.0.4758.102 | Firefox 97.0.1 (64-bit)\r\n\r\n**Anything else:**\r\n\u003c!-- e.g. stacktraces, related issues, suggestions how to fix --\u003e\r\n","author":{"url":"https://github.com/BigBadaboom","@type":"Person","name":"BigBadaboom"},"datePublished":"2022-02-25T10:56:27.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/17181/angular.js/issues/17181"}