Using Javascript can you get the value from a sess

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 can get the name -"poNumber" I get in servlet in the session attributes. I was to get it and display it's value.

I am new to programming.

Can get this working in jsp.

However need to get this working in a html page. Can I do it with javascript?

I have tried:

      <script type="text/javascript">
      var purchaseOrderNo = session.getAttribrute("pONumb");
      document.write("pONumb");
      </script> [

This does not output any values on the HTML page.

Tried:

       <script type="text/javascript">
       var purchaseOrderNo = (String) session.getAttribrute("pONumb");
           document.write("pONumb");
           </script>

Again get no output on page.

Tried:

            <script type="text/javascript">
            String purchaseOrderNo = (String) session.getAttribrute("pONumb");
            document.write("pONumb");
            </script>

Again get no output on page?

Can not think of any thing else to try. The servlet that redirects to this HTML page creates and set session attribute pONumb.

标签： javascript html servlets

4条回答

再贱就再见

2楼-- · 2020-02-07 19:45

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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够拽才男人

3楼-- · 2020-02-07 19:45

<%
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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戒情不戒烟

4楼-- · 2020-02-07 19:53

<?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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Ridiculous、

5楼-- · 2020-02-07 20:05

Below code may help you to achieve session attribution inside java script:

var name = '<%= session.getAttribute("username") %>';

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Using Javascript can you get the value from a sess

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