Unveiling a hidden div when a JSP expression language is not empty

Is there a proper way to display a hidden div only when certain conditions are met? For example, I want to show a login error message within a div only if there is an error. 

<div id= "error" class="alert alert-danger" hidden="hidden" role="alert">
    ${loginError} 
</div>

I attempted to use a script to achieve this but it was unsuccessful.

<script type="text/javascript">
    if(null != request.getAttribute("loginError")){
        document.getElementById("error").removeAttribute("hidden");

    }
</script>
cssjspbootstrap-4el

Answer №1

To truly understand the essence, it is crucial to recognize the precise moments when each code segment is executed - JSP runs on the server side, prior to delivering the page content to the browser. In contrast, Javascript operates within the browser environment, processing functions post-receiving the pre-generated response. Consequently, Javascript lacks a request variable, rendering statements like:

if(null != request.getAttribute("loginError")){

illogical. An alternate and more refined approach would be:

<div id= "error" class="alert alert-danger" ${ empty loginError ? '' : 'hidden'} role="alert">

(The exact value of hidden attribute is irrelevant, as its mere presence dictates hiding the respective element.)

Answer №2

To alter the visibility of an HTML element, it is necessary to modify the hidden attribute value to false. Even an empty string will automatically add the hidden attribute to the element. Therefore, utilizing boolean values is essential when changing the state of hiddenness in an HTML element. 

document.getElementById("error").hidden = false;

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