Cart Licenses Contact Support Online Creator Log in/Register
Try
Free
v 1.9.43

Run Expression Trigger


                        
        
            Survey.StylesManager.applyTheme("orange");
        

function setOfficialCountryName(params) {
    if (params.length < 2)
        return;
    var country = params[0];
    var officialName = params[1];
    var survey = this.survey;
    if (!country || !country.length) {
        survey.clearValue(officialName);
        return;
    }
    survey.setVariable("request_processing", true);
    survey.setVariable("request_error", null);
    country = country
        .charAt(0)
        .toUpperCase() + country
        .slice(1)
        .toLowerCase();
    $.ajax({
        url: "https://surveyjs.io/api/CountriesExample?name=" + country,
        type: "GET",
        success: function (data) {
            if (!!data && data.length > 0) {
                var countryValue = data[0];
                survey.setValue(officialName, countryValue.officialName);
                survey.setVariable("hasError", false);
            } else {
                survey.setVariable("hasError", true);
                survey.setVariable("request_error", "The country is not found.");
                survey.clearValue(officialName);
            }
                survey.setVariable("request_processing", false);
        },
        error: function (xhr, ajaxOptions, thrownError) {
            survey.setVariable("hasError", true);
            survey.setVariable("request_error", "The country is not found.");
            survey.clearValue(officialName);
        }
    });
}

Survey.FunctionFactory.Instance.register("setOfficialCountryName", setOfficialCountryName);

                
                    var json = {
  "elements": [
    {
      "type": "text",
      "name": "country",
      "title": "Please enter the country"
    },
    {
      "type": "html",
      "name": "requesting",
      "html": "The data is requesting",
      "visibleIf": "{request_processing} = true"
    },
    {
      "type": "text",
      "name": "name_official",
      "title": "Official name is:",
      "readOnly": true,
      "visibleIf": "{name_official} notempty"
    },
    {
      "type": "html",
      "name": "error",
      "html": "The following error has happened: <b>{request_error}</b>",
      "visibleIf": "{hasError} = true"
    }
  ],
  "triggers": [
    {
      "type": "runexpression",
      "expression": "{country} notempty or {country} empty",
      "runExpression": "setOfficialCountryName({country}, 'name_official')"
    }
  ]
};

                    window.survey = new Survey.Model(json);
                
        
            survey.onComplete.add(function(sender) {
            document.querySelector('#surveyResult').textContent =
            "Result JSON:\n" + JSON.stringify(sender.data, null, 3);
            });
        
            
                survey.render("surveyElement");
            

                    
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Run Expression Trigger, Knockoutjs Survey Library Example</title>
    
<meta name="viewport" content="width=device-width" />
    <script src="https://unpkg.com/jquery"></script>
    <script src="https://unpkg.com/knockout@3.5.1/build/output/knockout-latest.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-knockout-ui/survey-knockout-ui.min.js"></script>
    <link href="/DevBuilds/survey-core/survey.min.css" type="text/css" rel="stylesheet" />
    <link rel="stylesheet" href="./index.css">

</head>
<body style="margin: 0">
    
            <div id="surveyElement" style="display:inline-block;width:100%;">
            </div>
    <div id="surveyResult"></div>

<script type="text/javascript" src="./index.js"></script>

</body>
</html>

Tell Us What You Think

Help us serve you better by taking this brief survey.
We are interested to learn more about your
experience of using our libraries.

We'd really appreciate your feedback.

Start the Survey

Approximate time to complete: 2 min.