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POHow to use jquery to manipulate the querystring
 

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    <p>I have a select dropdown with id's mapped to values. On the onChange event I want to redirect to the same url but with 'id=value' appended to the querystring.</p> <p>How do I check that this 'id' option isn't already in the querystring (I don't want multiple values) and replace / append as necessary.</p> <p>How do I check if '?' is already in the querystring and append to the url if its not.</p> <p>Is there an easy way with jquery to do this?</p> <p>It must do something similar under the hood for <code>$().ajax(url, {options})</code> calls. I was hoping I could just do <code>$().redirect( url, { id : $(this).val() })</code> or somesuch.</p> <p>Thanks in advance.</p> <p>Note: This page may or may not have a few different query options passed in (which set defaults on other form options) so replacing the whole querystring is not an option.</p> <pre><code>&lt;html&gt; &lt;head&gt;&lt;script type="text/javascript" src="/jquery-1.3.2.min.js"&gt;&lt;/script&gt;&lt;/head&gt; &lt;body&gt; &lt;script&gt; $(function(){ $('#selector').change(function(){ // problem if 'id' option already exists var url = location.href + '?;id=' + $(this).val(); location.assign( url ); }); }); &lt;/script&gt; &lt;a href="#" onclick="location.assign( location.pathname )"&gt;reset&lt;/a&gt; &lt;form&gt; &lt;select id='selector' name='id'&gt; &lt;option value='1'&gt;one&lt;/option&gt; &lt;option value='2'&gt;two&lt;/option&gt; &lt;option value='3'&gt;three&lt;/option&gt; &lt;/select&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. COpossible duplicate of [querystring encoding of a javascript object](http://stackoverflow.com/questions/1714786/querystring-encoding-of-a-javascript-object)
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