Splice data in array

Question

I'm working on a project on data mapping. Several checks are realized:

• well imported file

• table choice

• columns choice of the table

• typage of data

I'm for at the part of the choice of columns for the moment. I'm stocking these various choices in an array. The problem is that if I want to delete one choice in my array, all data are deleted ! I'm using this plugin: http://wenzhixin.net.cn/p/multiple-select/docs/

var choiceFields = [];                  
$('#selectFields').multipleSelect({
    filter: true,
    onClick: function(view) 
    {
        choiceFields.push(view.value);
        var length = choiceFields.length-1;
        if(view.checked === false)
        {
            choiceFields.splice(view.value);
        }
        console.log(choiceFields);
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://rawgit.com/wenzhixin/multiple-select/master/multiple-select.css" rel="stylesheet"/>
<script src="https://rawgit.com/wenzhixin/multiple-select/master/multiple-select.js"></script>
<div class="select-box">
    <label for="selectFields"><span class="label-FieldChoice">Choice fields</span>  </label>
    <select id="selectFields" multiple="multiple" style="display: none;">
        <option value="id">id</option>
        <option value="username">username</option>
        <option value="username_canonical">username_canonical</option>
        <option value="email">email</option>
        <option value="email_canonical">email_canonical</option>
        <option value="enabled">enabled</option>
        <option value="salt">salt</option>
        <option value="password">password</option>
        <option value="last_login">last_login</option>
        <option value="confirmation_token">confirmation_token</option>
        <option value="password_requested_at">password_requested_at</option>
        <option value="roles">roles</option>
        <option value="lastName">lastName</option>
        <option value="firstName">firstName</option>
    </select>
    
</div>

Answer 1

You can do it like this:

var choiceFields = [];
$('#selectFields').multipleSelect({
  filter: true,
  onClick: function(view) {
    choiceFields.push(view.value);
    var length = choiceFields.length - 1;
    if (view.checked === false) {
      choiceFields = jQuery.grep(choiceFields, function(value) {
        return value != view.value;
      });
    }
    console.log(choiceFields);
  }
});

I've changed:

choiceFields.splice(view.value);

to:

choiceFields = jQuery.grep(choiceFields, function(value) {
  return value != view.value;
});

Demo

var choiceFields = [];
$('#selectFields').multipleSelect({
  filter: true,
  onClick: function(view) {
    choiceFields.push(view.value);
    var length = choiceFields.length - 1;
    if (view.checked === false) {
      choiceFields = jQuery.grep(choiceFields, function(value) {
        return value != view.value;
      });
    }
    console.log(choiceFields);
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://rawgit.com/wenzhixin/multiple-select/master/multiple-select.css" rel="stylesheet" />
<script src="https://rawgit.com/wenzhixin/multiple-select/master/multiple-select.js"></script>
<div class="select-box">
  <label for="selectFields"><span class="label-FieldChoice">Choice fields</span>  </label>
  <select id="selectFields" multiple="multiple" style="display: none;">
    <option value="id">id</option>
    <option value="username">username</option>
    <option value="username_canonical">username_canonical</option>
    <option value="email">email</option>
    <option value="email_canonical">email_canonical</option>
    <option value="enabled">enabled</option>
    <option value="salt">salt</option>
    <option value="password">password</option>
    <option value="last_login">last_login</option>
    <option value="confirmation_token">confirmation_token</option>
    <option value="password_requested_at">password_requested_at</option>
    <option value="roles">roles</option>
    <option value="lastName">lastName</option>
    <option value="firstName">firstName</option>
  </select>

</div>

Answer 2

In Array.splice() it takes 3 parameters array.splice(index, howMany, [element1][, ..., elementN]) .

index − Index at which to start changing the array.

howMany − An integer indicating the number of old array elements to remove. If howMany is 0, no elements are removed.

element1, ..., elementN − The elements to add to the array. If you don't specify any elements, splice simply removes the elements from the array.

But you had'nt provied howMany parameter in your answer provide this value to delete particular index from array

ex -

var choiceFields = [];                  
$('#selectFields').multipleSelect({
filter: true,
onClick: function(view) 
{
   
    var length = choiceFields.length-1;
    if(view.checked === false)
    {
        var index = choiceFields.indexOf(view.value);  // Finding Index of Item

        choiceFields.splice(index,1);   // Splicing one element from index
    }
    else{
     choiceFields.push(view.value);  // if false we do not push value
    }
    console.log(choiceFields);
},

onCheckAll: function() 
{
     
     
     choiceFields = [];    // delete all previous values
     var options = document.getElementById('selectFields');
     for(var i=0;i<options.length;i++){
        choiceFields.push(options[i].text);
     }
   
   console.log(choiceFields);

}
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://rawgit.com/wenzhixin/multiple-select/master/multiple-select.css" rel="stylesheet"/>
<script src="https://rawgit.com/wenzhixin/multiple-select/master/multiple-select.js"></script>
<div class="select-box">
    <label for="selectFields"><span class="label-FieldChoice">Choice fields</span>  </label>
    <select id="selectFields" multiple="multiple" style="display: none;">
        <option value="id">id</option>
        <option value="username">username</option>
        <option value="username_canonical">username_canonical</option>
        <option value="email">email</option>
        <option value="email_canonical">email_canonical</option>
        <option value="enabled">enabled</option>
        <option value="salt">salt</option>
        <option value="password">password</option>
        <option value="last_login">last_login</option>
        <option value="confirmation_token">confirmation_token</option>
        <option value="password_requested_at">password_requested_at</option>
        <option value="roles">roles</option>
        <option value="lastName">lastName</option>
        <option value="firstName">firstName</option>
    </select>
    
</div>