cannot set property 'color' of undefined

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I'm trying to create a custom error message and styling based on validation (I know about plugins, but the time involved in coordinating the validation plugin with Materialize is too much for a single field).

HTML:

<div class="input-field inline center-align">
  <input id="quantity" name="quantity" type="number" class="">
  <label for="qty" data-error="wrong" data-success="right" 
       class="active">Qty</label>
  <span id="qty-error">really?</span>
</div>

JS:

$('#quantity').change(function(){
  var $Qty = $(this).val();
  var $Label = $('#qty-error');
  if ($Qty > 0 && $Qty <= $AvailTix){
      $Label.html('seems reasonable');
      $Label.style.color = '#8e8ef5';
      $(this).addClass('valid');
  } else if ($Qty < 1){
      $Label.html('really?');
      $Label.style.color ='#f96d63';
      $(this).addClass('invalid');
  }
});

What's confusing me is that the $Label.html piece is working. It changes the text. But I get this error in the console for the $Label.style.color line:

Uncaught TypeError: Cannot set property 'color' of undefined


.style is property of an element. With jQuery you've that element in array. More like [elem]. So, use:

$Label.css('color', '#f96d63');

or

$Label.get(0).style.color = '#8e8ef5';

But the first one is more jQueryish.

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You get this error when you failed to bind style to an element appropriately. In AngularJS for instance <div *ngStyle="styleClass(variable)">{{variable.time}}</div> this will return cannot set undefined property color. Instead you should do this <div {ngStyle}="styleClass(variable)>{{variable.time}}</div>

for details on binding in AngularJS https://alligator.io/angular/style-binding-ngstyle-angular/

How to solve the 'cannot set property of undefined' issue on , In short, you can avoid setting properties on objects that don't exist. To access an object key the object has to exist. When it doesn't and you try to access the key, you get the "cannot set property of undefined" error. Uncaught TypeError: Cannot set property '_DT_CellIndex' of undefined. I searched the web and found that it usually occurs when the count of th mismatches the count of td. But I don't think that is causing the problem. See the table defination below :


$Label is a jQuery object, not a standard node element, so you can either do $Label[0].style.color = '#8e8ef5'; or $Label.css('color', '#8e8ef5');

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try $Label.css({color:'#8e8ef5'});

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Your problem is that you are trying to access a DOM property styleon a jQuery object, that's why you got Cannot set property 'color' of undefined.

In your code $Label is a jQuery object and don't have a style property because .style is a DOM object property so you can't use it with a jQuery object.

You need to use .css() method instead:

$Label.css('color', '#8e8ef5');

For more details you can read jQuery object and DOM element.

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