Survey.StylesManager.applyTheme("modern");
var json = {
"clearInvisibleValues": "onHidden",
"elements": [
{
"type": "radiogroup",
"name": "age18",
"title": "Are you 18 years old or older?",
"isRequired": true,
"choices": [ "Yes", "No" ],
"colCount": 0
},
{
"type": "radiogroup",
"name": "haveKids",
"title": "Do you have a kid(s)?",
"visibleIf": "{age18}='Yes'",
"isRequired": true,
"choices": [ "Yes", "No" ],
"colCount": 0
},
{
"type": "dropdown",
"name": "kids",
"title": "How many kids do you have",
"visibleIf": "{haveKids}='Yes'",
"isRequired": true,
"choices": [ 1, 2, 3, 4, 5 ]
},
{
"type": "dropdown",
"name": "kid1Age",
"title": "The first kid age:",
"visibleIf": "{kids} >= 1",
"isRequired": true,
"choicesMax": 18
},
{
"type": "dropdown",
"name": "kid2Age",
"title": "The second kid age:",
"visibleIf": "{kids} >= 2",
"isRequired": true,
"startWithNewLine": false,
"choicesMax": 18
},
{
"type": "dropdown",
"name": "kid3Age",
"title": "The third kid age:",
"visibleIf": "{kids} >= 3",
"isRequired": true,
"choicesMax": 18
},
{
"type": "dropdown",
"name": "kid4Age",
"title": "The fourth kid age:",
"visibleIf": "{kids} >= 4",
"isRequired": true,
"startWithNewLine": false,
"choicesMax": 18
},
{
"type": "dropdown",
"name": "kid5Age",
"title": "The fifth kid age:",
"visibleIf": "{kids} >= 5",
"isRequired": true,
"choicesMax": 18
}
]
};
window.survey = new Survey.Model(json);
survey.onComplete.add(function(sender) {
document.querySelector('#surveyResult').textContent =
"Result JSON:\n" + JSON.stringify(sender.data, null, 3);
});
var app = new Vue({
el: '#surveyElement',
data:
{
survey: survey
}
});
<!DOCTYPE html>
<html lang="en">
<head>
<title>Cascade conditions, Vue Survey Library Example</title>
<meta name="viewport" content="width=device-width" />
<script src="https://unpkg.com/vue@2.6.14/dist/vue.js"></script>
<script src="/DevBuilds/survey-core/survey.core.min.js"></script>
<script src="/DevBuilds/survey-core/survey.i18n.min.js"></script>
<script src="/DevBuilds/survey-vue-ui/survey-vue-ui.min.js"></script>
<link href="/DevBuilds/survey-core/modern.min.css" type="text/css" rel="stylesheet" />
<link rel="stylesheet" href="./index.css">
</head>
<body>
<div id="surveyElement" style="display:inline-block;width:100%;">
<survey :survey='survey' />
</div>
<div id="surveyResult"></div>
<script type="text/javascript" src="./index.js"></script>
</body>
</html>
Normally for the example like this, you should have the following visibleIf expression for "the age of the first kid":
visibleIf: "{age18}='Yes' and {haveKids} = 'Yes' and {kids} >= 1"However, this example works correctly with the following expression:
visibleIf: "{kids} >= 1"The magic is in setting clearInvisibleValues to "onHidden":
clearInvisibleValues: "onHidden"A user may set questions "Are you 18 years old or older?" and "Do you have a kid(s)?" to "Yes", then "How many kids do you have" to 1.