# Perspective dropdown deselect **URL:** \ **Category:** Ignition\ **Tags:** ignition80, perspective\ **Created:** [March 22, 2022, 4:24am UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445 "2022-03-22T04:24:23Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![yifeiliu08](https://avatars.discourse-cdn.com/v4/letter/y/bbe5ce/32.png) [@yifeiliu08](https://forum.inductiveautomation.com/u/yifeiliu08)\ **Post date:** [March 22, 2022, 4:24am UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/1 "2022-03-22T04:24:23Z")
![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/2/4234447b381d3bbb4dcaaade36b3f64aa055d54a.png) In vision dropdown if I want to reset the dropdown list, I can just set the SelectValue=-1 by scripting, I can also set the no selection data ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/0/90c5f0a89f046f33587535ab2ad70fee997a7ea6.png) I don’t knwo how to realize the same function in the perspective dropdown List ---
**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\ **Post date:** [March 22, 2022, 7:06am UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/2 "2022-03-22T07:06:42Z")
![Dropdown resest](https://us1.discourse-cdn.com/inductiveautomation/original/3X/8/a/8a374019e1d2437ace56b8a6b986e85a109ce42a.gif) Set the value to null (which is _None_ in Python). Here the reset button has the code, `self.getSibling("Dropdown").props.value = None` A better solution would be to use sendMessage. On the button onClick action is `system.perspective.sendMessage("dropdownReset", {}, scope = 'view')` On the dropdown, right-click, Configure Scripts, Message Handlers, Add Handler, set Message Type = 'dropdownReset`, set the Listen Scope to 'View' (same as the sendMessage setting above) and add the following code. `self.props.value = None`. sendMessage protects you from breaking the functionality if you move any of the components into containers, etc. * * * > I can also set the no selection data. The "Select..." text is set in `props.placeholder.text`. ---
**Author:** ![yifeiliu08](https://avatars.discourse-cdn.com/v4/letter/y/bbe5ce/32.png) [@yifeiliu08](https://forum.inductiveautomation.com/u/yifeiliu08)\ **Post date:** [March 22, 2022, 10:57am UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/3 "2022-03-22T10:57:13Z")
thanks for your support, but 2 more question, 1. In vision, my button’s enable can binding to the dropdown’s selected value,like the following picture ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/a/4a00ad9bfb7bb6702e450608a63b6560dd35c9f5.png) how can this function realize in perspective 2 . In vision I can change the dropdown component’s background and forground color, but how to realize this funtion in perspective? ---
**Author:** ![pascal.fragnoud](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pascal.fragnoud/32/24728_2.png) [@pascal.fragnoud](https://forum.inductiveautomation.com/u/pascal.fragnoud)\ **Post date:** [March 22, 2022, 11:57am UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/4 "2022-03-22T11:57:16Z")
Did you try ? I mean… ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/2/d26e3255c62b90526c9cc453673c01d5e068e502.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/f/9f5b5a88ee0915153905781ef1aa4dd63bf25019.png) ---
**Author:** ![yifeiliu08](https://avatars.discourse-cdn.com/v4/letter/y/bbe5ce/32.png) [@yifeiliu08](https://forum.inductiveautomation.com/u/yifeiliu08)\ **Post date:** [March 22, 2022, 12:46pm UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/5 "2022-03-22T12:46:37Z")
my dropdown list value is string, so your logic not works ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/8/b823a78af0b3869911e8574137c94aabeb705306.png) My purpose is when the dropdown is reset to default show orange, if select a value show green. ---
**Author:** ![pascal.fragnoud](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pascal.fragnoud/32/24728_2.png) [@pascal.fragnoud](https://forum.inductiveautomation.com/u/pascal.fragnoud)\ **Post date:** [March 22, 2022, 12:55pm UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/6 "2022-03-22T12:55:14Z")
Well… this is not my logic, it’s the one you showed in your screenshot ! I just reproduced exactly what you were doing. If your goal is to give something a specific color when nothing is selected in your dropdown, you can use pretty much the same expression, just check if `props.value` is null, or whatever the default value is. Here I check for null and empty string: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/9/994f60c4e91d6a3ad0b1badcbb16a22ded7b10b6.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/9/395555440b955efa9a8d1223d28e140b2d6e50ec.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/1/e119c99576d84fc396271d600d2d46673d72d230.png) ---
**Author:** ![yifeiliu08](https://avatars.discourse-cdn.com/v4/letter/y/bbe5ce/32.png) [@yifeiliu08](https://forum.inductiveautomation.com/u/yifeiliu08)\ **Post date:** [March 22, 2022, 1:09pm UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/7 "2022-03-22T13:09:17Z")
this color works , but how to handle when the props.value is null I need disable the botton function? ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/7/e73dc4b7dd2858dc202e044ffabd2416ec80facf.png) here is the sender I need when the prop.value is null disable the button enable function ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/5/65436649ebbca168e151f4ea73ee6e57c5cbefe2.png) ---
**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\ **Post date:** [March 22, 2022, 1:17pm UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/8 "2022-03-22T13:17:40Z")
Set the enabled property to either true or false. Exactly the same binding only instead of mapping to a color you map it to a value. `false` when you want it disabled and `true` when you want it enabled. ---
**Author:** ![victordcq](https://avatars.discourse-cdn.com/v4/letter/v/f6c823/32.png) [@victordcq](https://forum.inductiveautomation.com/u/victordcq)\ **Post date:** [March 22, 2022, 1:27pm UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/9 "2022-03-22T13:27:39Z")
you put a red circle around the `meta.tooltip.enable` . this disabled the tooltip, not the button the button is at `props.enabled` ---
**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\ **Post date:** [March 22, 2022, 1:34pm UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/10 "2022-03-22T13:34:58Z")
This property: ![Button enable](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/e/9e4d74febbb9b178c065367af5b4507579dd1956.png) ---
**Author:** ![yifeiliu08](https://avatars.discourse-cdn.com/v4/letter/y/bbe5ce/32.png) [@yifeiliu08](https://forum.inductiveautomation.com/u/yifeiliu08)\ **Post date:** [March 22, 2022, 2:00pm UTC](https://forum.inductiveautomation.com/t/perspective-dropdown-deselect/57445/11 "2022-03-22T14:00:11Z")
@Transistor @victordcq @lrose @pascal.fragnoud thanks for all of your support, I just transfer from vision to perspective, a lot of logic have to change