ServiceNow：在回调函数中调用 onSubmit 导致死循环

Question

这里我比较日期 start_date 和 end_date 的 2 个变量，并且仅在 end_date 大于 start_date 的情况下才允许提交表单，否则拒绝要提交的表单，但是运行这段代码会进入无限循环，如果我使用 getXMLWait() 而不是 getXML(checkDateDiff) 使其异步，则移动 api 不支持它.

还有很多客户端脚本可以帮助比较日期，但移动 apis 支持其中的 none。

请查看下面的代码并提供帮助！！！！

function onSubmit() {
    var requestType = g_form.getValue('request_type');
    if (requestType == 'mifi') {
        console.log("calling validateTravelEndDate()");
        validateTravelEndDate();
        return false;
    } else
        return true;
}

//Helper function which calls a AJAX script include called "ClientDateTimeUtils" which gives the response in a callback where i am deciding whether to submit the form or not based on the status of days result.

function validateTravelEndDate() {
    var startDate = g_form.getValue('travel_start'); //First Date/Time field
    var endDate = g_form.getValue('travel_end'); //Second Date/Time field
    var dttype = 'day'; //this can be day, hour, minute, second. By default it will return seconds.
    console.log("startDate :" + startDate + "endDate :" + endDate);
    var ajax = new GlideAjax('ClientDateTimeUtils'); // This is the script include which can be used for date validation.
    ajax.addParam('sysparm_name', 'getDateTimeDiff');
    ajax.addParam('sysparm_fdt', startDate);
    ajax.addParam('sysparm_sdt', endDate);
    ajax.addParam('sysparm_difftype', dttype);
    console.log("before " + g_form.getValue('travel_end'));
    ajax.getXML(checkDateDiff);
}

// callback function where deciding to go ahead or not with form submission.
function checkDateDiff(response) {
    var answer = response.responseXML.documentElement.getAttribute("answer");
console.log("difference in days:" + answer);
    if (answer <= 0) {
        alert("Travel End date must be after Travel Start date.");
        g_form.setValue('travel_end', '');
        g_form.showFieldMsg('travel_end', 'Please provide a future date', 'error');
       return false;
 } else {
      console.log("%%%%%%%%%%%%%%% Calling g_form.submit()");
      g_form.submit(); // This has some issue as it’s going in the infinite loop and if we just return true/false from here as it’s asynchronous call , it’s not handled by the onSubmit function
  }
}

Answer 1

您的 onSubmit() 函数总是 returns false 用于 mifi 请求。 onSubmit() 函数可以在 return a true 时执行更安全的提交。此外，g_form 函数不能在回调函数中运行，因为它是在服务器上执行的。

与其在 checkDateDiff 函数末尾使用 g_form.submit()，不如使用 onSubmit() 函数 return true.

像这样的东西应该有用。我评论了我更改的每一行：

function onSubmit() {
    var requestType = g_form.getValue('request_type');
    if (requestType == 'mifi') {
        console.log("calling validateTravelEndDate()");

        // **CHANGED CODE: instead of g_form.submit(), this will return true
        if(validateTravelEndDate()){
            return true;
        }
        else{
            return false;
        }

    } else
        return true;
}

//Helper function which calls a AJAX script include called "ClientDateTimeUtils" which gives the response in a callback where i am deciding whether to submit the form or not based on the status of days result.

function validateTravelEndDate() {
    var startDate = g_form.getValue('travel_start'); //First Date/Time field
    var endDate = g_form.getValue('travel_end'); //Second Date/Time field
    var dttype = 'day'; //this can be day, hour, minute, second. By default it will return seconds.
    console.log("startDate :" + startDate + "endDate :" + endDate);
    var ajax = new GlideAjax('ClientDateTimeUtils'); // This is the script include which can be used for date validation.
    ajax.addParam('sysparm_name', 'getDateTimeDiff');
    ajax.addParam('sysparm_fdt', startDate);
    ajax.addParam('sysparm_sdt', endDate);
    ajax.addParam('sysparm_difftype', dttype);
    console.log("before " + g_form.getValue('travel_end'));

    // **CHANGED CODE: validateTravelEndDate returns the callback value
    return ajax.getXML(checkDateDiff);
}

// callback function where deciding to go ahead or not with form submission.
function checkDateDiff(response) {
    var answer = response.responseXML.documentElement.getAttribute("answer");
    console.log("difference in days:" + answer);
    if (answer <= 0) {
        alert("Travel End date must be after Travel Start date.");
        g_form.setValue('travel_end', '');
        g_form.showFieldMsg('travel_end', 'Please provide a future date', 'error');
        return false;
    }
    else {
    // **CHANGED CODE: checkDateDiff will return true
        return true;
    }
}

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