Checkbox - The `isExlusive` property for Checkbox Items

JaneSjs commented 1 year ago

Posted by @SamMousa at https://github.com/surveyjs/survey-library/issues/4764

isExclusive This option would implement logic similar to the option added by hasNone (and could replace its functionality). There are use cases for multiple exclusive options and this also allows the user to program the value for the option.

JaneSjs commented 1 year ago

Hi @SamMousa, Thank you for your suggestion. While we don't have immediate plans to introduce such an option, you may wish to handle this usage scenario using the survey.onValueChanged function.

For example, introduce a custom isExclusive:boolean property and check/uncheck Checkbox items based depending on whether a user selects an isExclusive item. Consider this sample code:

Survey.Serializer.addProperty(
  "itemvalue", {
    name: "isExclusive:boolean",
    default: false,
    category: "general"
  }
);
var json = {
  "elements": [
    {
      "type": "checkbox",
      "name": "car",
      "title": "What car are you driving?",
      "isRequired": true,
      "hasNone": false,
      "colCount": 2,
      "choices": [
        { "text" : "Ford", "value" : "Ford"},
        { "text" : "Vauxhall", "value" : "Vauxhall"},
        { "text" : "Volkswagen (exclusive)", "value" : "Volkswagen", "isExclusive" : "true"},
        { "text" : "Nissan", "value" : "Nissan"},
        { "text" : "Audi (exclusive)", "value" : "Audi", "isExclusive" : "true"}
      ]
    }
  ]
};
...
survey.onValueChanged.add((sender, options) => { 
  const q = options.question;
  if(!q || q.getType() != "checkbox") return;
  let lastSelectedItem = q.selectedItems.pop();
  if (Survey.Helpers.isTwoValueEquals(lastSelectedItem.value, q.prevValue)) return;
  if(!!lastSelectedItem.isExclusive){
    if (Survey.Helpers.isTwoValueEquals(lastSelectedItem.value, q.prevExclusiveValue)) return;
    q.prevExclusiveValue = lastSelectedItem.value;
    q.value = lastSelectedItem.value;
  }
  if(!lastSelectedItem.isExclusive) {
    if(!!q.prevExclusiveValue){
      q.prevExclusiveValue = null;
      q.value = lastSelectedItem.value;
    }
  } 
  q.prevValue = options.value.slice(); 
});

Check this sample. Please let me know if this option works for you.

For the record: we've also discussed a similar issue at Unchecked other choices when I select special item (checkbox).

SamMousa commented 1 year ago

Should this not remain open if it is not yet implemented?

JaneSjs commented 1 year ago

Hello @SamMousa, Thank you for your comment. Yes, sure, I reopened this issue and put it to our backlog. Thank you for your valuable suggestions.

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SamMousa commented 1 year ago

If I have a developer work on implementing this would you review (and if you approve the code quality) and add this feature?

SamMousa commented 4 months ago

This is still an issue for us (and our users). The current work arounds require custom JS which is not realistic for end users.

SamMousa commented 4 months ago

This can be closed since you went the route of yet more special choices over a generic solution: https://github.com/surveyjs/survey-library/issues/7754

surveyjs / survey-library

Checkbox - The `isExlusive` property for Checkbox Items #4778