Using Javascript can you get the value from a session attribute set by servlet in the HTML page

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I have a servlet that forwards to a HTML page, using redirect. Because I am using ajax and php on the html page to do other functions. Can turn into a jsp. Is there a way I

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情书的邮戳

2020-12-08 05:08
Below code may help you to achieve session attribution inside java script:
```
var name = '<%= session.getAttribute("username") %>';
```
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清酒与你

2020-12-08 05:11

<?php 
    $sessionDetails = $this->Session->read('Auth.User');

    if (!empty($sessionDetails)) {


        $loginFlag = 1;
        # code...
    }else{
        $loginFlag =  0;
    }


?>

<script type="text/javascript">

    var sessionValue = '<?php echo $loginFlag; ?>';
    if (sessionValue = 0) {

        //model show
    }
</script>

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难免孤独

2020-12-08 05:14
No, you can't. JavaScript is executed on the client side (browser), while the session data is stored on the server.

However, you can expose session variables for JavaScript in several ways:
- a hidden input field storing the variable as its value and reading it through the DOM API
- an HTML5 data attribute which you can read through the DOM
- storing it as a cookie and accessing it through JavaScript
- injecting it directly in the JS code, if you have it inline
In JSP you'd have something like:
```
<input type="hidden" name="pONumb" value="${sessionScope.pONumb} />
```
or:
```
<div id="product" data-prodnumber="${sessionScope.pONumb}" />
```
Then in JS:
```
// you can find a more efficient way to select the input you want
var inputs = document.getElementsByTagName("input"), len = inputs.length, i, pONumb;
for (i = 0; i < len; i++) {
    if (inputs[i].name == "pONumb") {
        pONumb = inputs[i].value;
        break;
    }
}
```
or:
```
var product = document.getElementById("product"), pONumb;
pONumb = product.getAttribute("data-prodnumber");
```
The inline example is the most straightforward, but if you then want to store your JavaScript code as an external resource (the recommended way) it won't be feasible.
```
<script>
    var pONumb = ${sessionScope.pONumb};
    [...]
</script>
```
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予麋鹿

2020-12-08 05:27

<%
String session_val = (String)session.getAttribute("sessionval"); 
System.out.println("session_val"+session_val);
%>
<html>
<head>
<script type="text/javascript">
var session_obj= '<%=session_val%>';
alert("session_obj"+session_obj);
</script>
</head>
</html>

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