Password Match Validation in JavaScript

This code snippet demonstrates a Password match validation in JavaScript.

Password match validation in javascript

Html Code For Two Password textbox

<div class="form-group">
    <label class="col-sm-2 control-label">
        Password:</label>
    <div class="col-sm-10">
        <input type="password" id="pass1" class="tex" name="pw1" ng-model="passw1" placeholder="Password" />
    </div>
</div>
<div class="form-group">
    <label class="col-sm-2 control-label">
        Repeat:</label>
    <div class="col-sm-10">
        <input type="password" id="pass2" class="tex" name="pw2" ng-model="passw2" placeholder="Repeat Password" />
    </div>
</div>

JavaScript Code

strErrorMsg = "";
checkPass(document.getElementById('pass2'), '-Password Not Match');

if (strErrorMsg == '')
{....

}
$window.alert(' Errors \n' + strErrorMsg);

Validation Code

function checkPass(elem, helperMsg)
{
    if (pass1.value !== "" && pass2.value !== "")
    {
        if (pass1.value !== pass2.value)
        {
            strErrorMsg = strErrorMsg + helperMsg + "\n";
        }
        else
        {
        }
    }
}