NVDA忽略角色=“alert”的角* ngIf块

我的目标是给用户提供有关输入错误的信息。在这个例子中，我可以做到没有角度。我也设法用“的innerHTML”属性重新创建下面的例子，但它也时错误occuresNVDA忽略角色=“alert”的角* ngIf块

<!DOCTYPE html> 
<html><head> 
<meta http-equiv="content-type" content="text/html; charset=windows-1252"> 
<title>Contact form (WAI-ARIA)</title> 
<script type="text/javascript"> 
    function removeOldAlert() 
    { 
    var oldAlert = document.getElementById("alert"); 
    if (oldAlert) 
     document.getElementById("error").removeChild(oldAlert); 
    } 

    function addAlert(aMsg) 
    { 
    removeOldAlert(); 
    var newAlert = document.createElement("div"); 
    newAlert.setAttribute("role", "alert"); 
    newAlert.setAttribute("id", "alert"); 
    var msg = document.createTextNode(aMsg); 
    newAlert.appendChild(msg); 
    document.getElementById("error").appendChild(newAlert); 
    } 

    function checkEntryValidity(aID, aSearchTerm, aMsg) 
    { 
    var elem = document.getElementById(aID); 
    var invalid = (elem.value.indexOf(aSearchTerm) < 0); 
    if (invalid) { 
     elem.setAttribute("aria-invalid", "true"); 
     addAlert(aMsg); 
    } else { 
     elem.setAttribute("aria-invalid", "false"); 
     removeOldAlert(); 
    } 
    } 
</script> 
</head> 
<body> 
<form method="post" action="post.php"> 
<fieldset><legend>Please enter your contact details</legend> 
<label for="name">Your name (required):</label> 
<input name="name" id="name" aria-required="true" onblur="checkEntryValidity('name', ' ', 'Invalid name entered!');" aria-invalid="true" value=""><br> 
<label for="email">E-Mail address (required):</label> 
<input name="email" id="email" aria-required="true" onblur="checkEntryValidity('email', '@', 'Invalid e-mail address');" aria-invalid="true" value=""><br> 
<label for="website">Website (optional):</label> 
<input name="website" id="website" value=""> 
</fieldset> 
<label for="message">Please enter your message (required):</label><br> 
<textarea name="message" id="message" rows="5" cols="80" aria-required="true"></textarea><br> 
<input name="submit" value="Send message" type="submit"> 
<input name="reset" value="Reset form" type="reset"> 
</form> 
<div id="error"></div> 

</body></html>

没有与NVDA工作，总之它只是一个附加节点到身体（警示无效的名称进入！）

但NVDA忽略此类警报消息的

<!-- widget with model binding here -->  
<div role="alert" class="validation" *ngIf="model.hasErrors()"> 
     <div *ngFor="let message of model.errors">{{message}}</div> 
    </div>

我不知道为什么NVDA不会注册该内容更改。

Angular2

我使用Windows 10，火狐50.1.0和NVDA 2016.4。

来源

2017-01-11 martini449

看来，加入唱段，像这样生活

<div aria-live="assertive"> 
    <div role="alert" class="validation" *ngIf="model.hasErrors()"> 
     <div *ngFor="let message of model.errors">{{message}}</div> 
    </div> 
    </div>

允许登记变更读者。

来源

2017-01-11 09:30:43 martini449

NVDA忽略角色=“alert”的角* ngIf块

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