The select changed and now?

[wrb]

In the code below I need to select an item in the "select" the graphic is rendered, how could implement this?

@using (Html.BeginForm()){    @Html.AntiForgeryToken()    @Html.ValidationSummary(true)<select id="animais" name="cod_animal" class="form-control"></select><script type="text/javascript">        //google.load('visualization', '1.1', { 'packages': ['corechart'] });     //google.setOnLoadCallback(drawChart);    function drawChart() {              var frm = document.getElementById('#animais');        var animais = frm.options[frm.selectedIndex].value;                var url = '/Programa_Nutricao/Avaliacao/EvolucaoPeso/' + animais;        $.get(url, {},              function (data) {                  var tdata = new google.visualization.DataTable();                  tdata.addColumn('date', 'data_semanal');                  tdata.addColumn('number', 'peso_kg');                  for (var i = 0; i < data.length; i++) {                      if (data[i].data_semanal != null)                          tdata.addRow([ToJavaScriptDate(data[i].data_semanal), parseFloat(data[i].peso_kg)]);                  }                  var options = {                      title: 'Evolução do peso corporal',                      width: 700,                      height: 500,                      vAxis: { title: "PESO (kg)", minValue: 1, maxValue: 6 },                      hAxis: { title: "DATA", textStyle: { fontSize: 10 } },                      legend: { position: "none" }                  };                  var chart = new google.visualization.LineChart(document.getElementById('EvolucaoPeso'));                  chart.draw(tdata, options);              });    }</script> <div id="EvolucaoPeso" style="width: 900px; height: 500px;"></div>

[justsomeguy]

Check your developer console for error messages. Don't use "#" as part of the element ID.

[wrb]

I was with an event in select "onchange" as below, but in the select has only one item I not I the desired effect.

I need to render the chart being the select filled.

<form action="">

@Html.DropDownList("cod_animal", null, new { onchange = "drawchart(this.value)", Name = "cod_animal", id = "cod_animal", @class = "form-control" })

</form>

<script type="text/javascript">

google.load('visualization', '1.1', { 'packages': ['corechart'] });

google.setOnLoadCallback(function(){drawchart('')});

function drawchart(cod_animal) {

var url = '/Programa_Nutricao/Avaliacao/EvolucaoPeso/' + cod_animal;

$.get(url, {},

function (data) {

var tdata = new google.visualization.DataTable();

tdata.addColumn('date', 'data_semanal');

tdata.addColumn('number', 'peso_kg');

for (var i = 0; i < data.length; i++) {

if (data.data_semanal != null)

tdata.addRow([ToJavaScriptDate(data.data_semanal), parseFloat(data.peso_kg)]);

}

var options = {

title: 'Evolução do peso corporal',

width: 700,

height: 500,

vAxis: { title: "PESO (kg)", minValue: 1, maxValue: 6 },

hAxis: { title: "DATA", textStyle: { fontSize: 10 } },

legend: { position: "none" }

};

var chart = new google.visualization.LineChart(document.getElementById('EvolucaoPeso'));

chart.draw(tdata, options);

});

}

</script>

[justsomeguy]

Why change the code? Does that onchange event send the correct value to the function? Are you checking that? Are you verifying that the URL is correct?

[wrb]

I changed the code because I did not find the error ... The "onchange" sends the value and renders the chart. The URL is correct, it is the place of animals I put 1 for example, the chart is rendered.

[justsomeguy]

It sounds like everything is working then, is there still a problem?

[wrb]

See It. The graph is right, the URL this right. The problem is the event when the select receives a graphic value must render. In fact I do not know if the path is with the post code. Lack knowledge in JavaScript...

[justsomeguy]

The problem is the event when the select receives a graphic value must render.

I don't really understand what you mean. Is there a problem with onchange?

[wrb]

Yes, when the select has only one item.

[justsomeguy]

So you need to verify that the correct value is being sent to that function, and then that the correct URL is being built.