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POPassing a servlet variable into javascript
 

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    <p>I'm looking to pass a servlet variable, myVar that is passed into a JSP page, and pass it to JavaScript. The JavaScript is an external javascript that is included into the JSP page.</p> <p>I have a button that calls the JavaScript function, but I'm unable to pass any of the variables that are passed into the JSP page through the servlet. The button is not a part of a form. </p> <p>I've tried in a function in JavaScript to call:</p> <pre><code>var x = '&lt;%=myVar%&gt;'; </code></pre> <p>AND</p> <pre><code>var x = '${myVar}'; </code></pre> <p>AND </p> <pre><code>var x = '&lt;%= (String)request.getParameter("myVar") %&gt;'; </code></pre> <p>However, <code>x</code> is always a string of what I inputted.</p> <p>I'm not using AJAX or JQuery. Any ideas?</p> <p>Example Code is a simplified version: (so the button is actually a drop down that calls the js when I change the value, however, I want other variables that are not part of the drop down to be called in changeCLass)</p> <p>Servlet side:</p> <pre><code>request.setAttribute("otherVars","tests"); </code></pre> <p>JSP:</p> <pre><code>&lt;script type="text/javascript" src="external.js"&gt;&lt;/script&gt; &lt;select name="vars" id="myVars" onchange="changeClass(this)"&gt; &lt;option value='1' selected="selected"&gt;1&lt;/option&gt; &lt;/select&gt; </code></pre> <p>external.js included in JSP:</p> <pre><code>function changeClass(newVarX) { var newVarId =newVarX.value; var tID = '${otherVars}'; alert(newVarId + " " + tID); } </code></pre> <p>Output: 1 $(otherVars}</p> <p>but output should be: 1 tests</p>
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    1. COis this code taken from the external file?
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      1. USrano
    2. CO@user1798546 simple way of doing it is creating a hidden field that stores the value and getting it from there. Another way is to pass the variable into the js function as a parameter `<button onclick='someFunction(<%= (String)request.getParameter("myVar") %>)'> Call function</button>`
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      1. POPassing a servlet variable into javascript
      1. USLyuben Todorov
    3. COIt would be better to explain how your application behaves atm (with code sample) to have a better understanding and provide a better solution
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      1. USLuiggi Mendoza
 

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