Get value of select in view with javascript

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hello all

i want to get value of select items in my Javascript code.
this my view code.

HTML

<pre><div class="form-group ">
                                    <label id="locationdepart" class="control-label"> Stockage de depart </label>
                                    <select id="locationdepart" class="form-control" asp-items="ViewBag.fromlocation"> </select>
                                    <span id="locationdepart" class="text-danger"> </span>
                                </div>
                            </div>

                            <div class="col-lg-3">

                                <div class="form-group">
                                    <label id="locationarrive" class="control-label"> Stockage d'arrivée </label>
                                    <select id="locationarrive" class="form-control" asp-items="ViewBag.fromlocation"> </select>
                                    <span id="locationarrive" class="text-danger"></span>
                                </div>

What I have tried:

this is my JS code.

this my error :

Uncaught TypeError: Cannot read property 'value' of null

JavaScript

 function onAddClick() {

            var transfertDep = document.getElementById("#locationdepart").value;
          //  var transfertDep = e.options[e.selectedIndex].value;

            var transfertArr = document.getElementById("#locationarrive").value;
}

Posted 18-May-20 7:23am

Member 13220552

Updated 18-May-20 9:06am

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2 solutions

Solution 1

"value" is for form elements like textbox, combo etc. Labels and spans don't have a value, so use innerHTML or innerText to get the html inside a tag rather than "value".

Posted 18-May-20 7:50am

F-ES Sitecore

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Member 13220552 18-May-20 14:19pm

thank i try that and i come back

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Richard Deeming · Accepted Answer · 2020-05-18T09:07:00

Quote:

HTML

<label id="locationdepart" class="control-label"> Stockage de depart </label>
<select id="locationdepart" class="form-control" asp-items="ViewBag.fromlocation"> </select>
<span id="locationdepart" class="text-danger"> </span>

You're setting the same id on the label, the form element, and the validation message. IDs in an HTML document must be unique.

Since you're using ASP.NET Core, you can use the tag helpers to generate the correct IDs:

HTML

<label asp-for="locationdepart" class="control-label"> Stockage de depart </label>
<select id="locationdepart" asp-for="locationdepart" class="form-control" asp-items="ViewBag.fromlocation"> </select>
<span asp-validation-for="locationdepart" class="text-danger"> </span>

If you view the page source in your browser, the rendered HTML should look something like:

HTML

<label for="locationdepart" class="control-label"> Stockage de depart </label>
<select id="locationdepart" name="locationdepart" class="form-control"">
    <option value="...">...</option>
    ...
</select>
<span class="text-danger field-validation-valid" data-valmsg-for="locationdepart"></span>

Your script should then start working:

JavaScript

function onAddClick() {
    var transfertDep = document.getElementById("#locationdepart").value;
    console.log(transfertDep);
    ...
}