angularjs - validation directive with a small red strip at right or left side inside textbox -

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I am making verification instructions with the NG-model.

Target: If the model is empty, empty or undefined, then it will give a small red strip inside the special text box.

Even I have done so far ... in my example, it converts the entire background to red when I left only a small red bar on the left or right side of the text Want in the box ..

Illusion: I do not know how to create CSS that will only generate a small red bar within the textbox

. CSS 

  .require {background: red; }

.html

.js 

  var app = angular Module ('app', []); App.directive ("nxRequired", function () {return: "a", required: "ngmodel", scope: {ngModel: "="}, link: function (scope, atr, amm) {scope. ("Ngmodel", function (newville, oldwail) {debugger if (newewell! = Undefined and newell! = "") {Elem. $ RemoveClass ("required");} Other {AMM $ addClass ("requirement");} });}};});

If I think your question is correct ...

Change:

.require {background: red; }

From: 

  .require {border-style: solid; Border-left: 2px solid red; }

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