Managing form submissions using Jquery and checkboxes

Whenever I submit my dynamically created form, all checkboxes briefly become selected for a split second. Does anyone have an explanation for this behavior? Is it common or is there something wrong with my code? Although the form submits correctly, it might confuse users to see all checkboxes checked suddenly after clicking "vote". (Please note that there may be a small amount of C# included in this).

The form looks like this when created:

<form action="/en/OnlineServices/SomeService" method="post">        
<div id="voters">
   <label><input type="checkbox" class="votebox" value="Some Name">Some Name<br></label>
<label><input type="checkbox" class="votebox" value="Some Name">Some Name<br></label>
<label><input type="checkbox" class="votebox" value="Some Name">Some Name<br></label>
<label><input type="checkbox" class="votebox" value="Some Name">Some Name<br></label>
</div>
<input id="VoteSubmit" type="submit" value="Vote">
    <span style="margin-left: -9999px;"><input id="Vote" name="Vote" type="text" value=""></span>
    <span style="margin-left: -9999px;"><input id="Language" name="Language" type="text" value=""></span>

Here is the accompanying JavaScript:

 <script>
$(document).ready(function () {
    $("input#Vote").val("")
    $("#voters").after("<input id='VoteSubmit' type='submit' value='Vote' />");

    var language = "@(bool.Parse(res.IsFrench) ? "FR" : "EN")";   // Sets var language as user languge
    $("input[type=checkbox]").click(function () {
        $(this).prop("checked", true);

    });
    $("input[type=checkbox]").change(function () {
        $("input[type=checkbox]").prop("checked", false);

        var a = $(this).val();
        $("input#Vote").val(a); // Inserts cows name into hidden field
    $("#Language").val(language);// Inserts language  into hidden field
    });



});
</script>

Answer №1

It seems like the issue could be related to this --

if ($(this).prop("checked", true)) {
    $(this).addClass("selected");
}

It appears that you are trying to check the "checked" property and then add a class if it is true. However, keep in mind that $("input[type=checkbox]") will select all checkboxes on the page, so any change to one checkbox will trigger the event code for all of them. Consequently, using $(this) inside the function will refer to the entire set of checkboxes. The if statement will return 'this', which evaluates to truthy, leading to the issue. You may want to try adjusting the code like this:

if($(this).prop("checked")) {

Answer №2

It appears that there may be an issue with your jQuery code. The snippet below demonstrates how the change event will reset all checkboxes to an unchecked state:

$("input[type=checkbox]").click(function () {
    $(this).prop("checked", true);
});

You also seem to have missed a semicolon in the second line.

<script>
$(document).ready(function () {
    $("input#Vote").val("");
    $("#voters").after("<input id='VoteSubmit' type='submit' value='Vote' />");

    var language = "@(bool.Parse(res.IsFrench) ? 'FR' : 'EN')";   // Setting var language based on user language
    $("input[type=checkbox]").click(function () {
        $(this).prop("checked", true);

    });

    $("input[type=checkbox]").change(function () {
        $("input[type=checkbox]").prop("checked", false);

        var a = $(this).val();
        $("input#Vote").val(a); // Inserting cow's name into hidden field
        $("#Language").val(language); // Inserting language into hidden field
    });
});
</script>

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