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    <p>I solved the problem. The function should look like:</p> <pre><code>&lt;script type="text/javascript"&gt; $(document).ready(function() { var sector = document.getElementById("conflictos1_id_sector_actividad"); var id_sub = sector.options[sector.selectedIndex].value; { $.ajax ({ type: "POST", url: '&lt;?php echo url_for('conflictos/subsector'); ?&gt;'+ '?id=' + id_sub, cache: false, data: "id_sub="+ id_sub, success: function(data) { // alert(data);// its show my returned value $("#conflictos1_id_subsector_actividad").html(data);// but it does not select the value of dropdown list. } }); } $("#conflictos1_id_sector_actividad").change(function() { var id_sub = $(this).val(); if(id_sub != '') { $.ajax ({ type: "POST", url: '&lt;?php echo url_for('conflictos/subsector'); ?&gt;'+ '?id=' + id_sub, cache: false, data: "id_sub="+ id_sub, success: function(data) { $("#conflictos1_id_subsector_actividad").html(data);// but it does not select the value of dropdown list. } }); } else { $("#conflictos1_id_subsector_actividad").html("&lt;option value=''&gt;-- No se ha seleccionado subsector --&lt;/option&gt;"); } return false; }); }); &lt;/script&gt; </code></pre> <p>The same function is now executed when the document is loaded. Now I've the better answer here: <a href="https://stackoverflow.com/questions/20385422/symfony-1-4-how-i-can-retrieve-the-selected-value-with-ajaxs-function-in-selec">Symfony 1.4: How I can retrieve the selected value with AJAX&#39;s function in select dependent?</a></p>
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    1. POSymfony 1.4 with AJAX jQuery. How can I improve the AJAX's function that contains a select box which depends on another select box?
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    1. USJorge H
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    1. POSymfony 1.4 with AJAX jQuery. How can I improve the AJAX's function that contains a select box which depends on another select box?
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    1. CODo yourself a favor and [DRY](http://en.wikipedia.org/wiki/Don%27t_repeat_yourself)! Create a function and call it like `$(document).ready(yourfunction).on("change", "#conflictos1_id_sector_actividad", yourfunction)`. This will save you a lot of headaches…
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      1. USnietonfir
    2. COThe better solution, here: http://stackoverflow.com/questions/20385422/symfony-1-4-how-i-can-retrieve-the-selected-value-with-ajaxs-function-in-selec
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