Failure of Ajax POST requests to refresh screen content

Within my "scenario", I have numerous "forms" that consist of various "events," "data," and more. To populate all this information, I've included the following script to run once the page has fully loaded:

$(document).ready(function() {
var scenarioID = ${testScenarioInstance.id}
var myData = ${results as JSON}
populateFormData(myData, scenarioID);
});

This script then triggers the functions below (the first function calls the second one, set up this way due to an issue with variable updates during ajax operations):

function populateFormData(results, scenarioID) {
    $table = $('#formList')
    for ( var i in results) {
        var formIDX = (results[i]["forms_idx"])
        var formID = (results[i]["form_id"])
        appendSubTable(formIDX, scenarioID, $table, formID);
    }
}
    function appendSubTable(formIDX, scenarioID, $table, formID) {
    var url = "http://localhost:3278/FARTFramework/testScenario/ajaxPopulateSubTables"
    $.post(url, {
        formIDX : formIDX, scenarioID : scenarioID, formID :formID 
    }, function(data) {
        var $subTable = $table.find("#" + formIDX).find('td:eq(1)').find("div").find("table")
        $subTable.append(data)
    }).fail(function() {
        alert("it failed!")
    });
}

This process retrieves data from the controller using the following method:

def ajaxPopulateSubTables(int formIDX, int scenarioID, int formID) {
        def db = new Sql(dataSource)

        String mySQL = "Loads of SQL STUFF"
        def subTableResults = db.rows(mySQL)

        render(template: "subTableEntry", model: [subTableResults:subTableResults, formID:formID, formIDX:formIDX])
    }

The retrieved data is then displayed on the page using a GSP template:

<colgroup>
        <col width="150"/>
        <col width="350"/>
        <col width="350"/>
        <col width="350"/>
    </colgroup>
<g:if test="${subTableResults != null && !subTableResults.isEmpty()}">
    <tr>
        <th>eventIDX</th>
        <th>eventID </th>
        <th>objID</th>
        <th>testVal</th>
    </tr>
</g:if>


<g:each in="${subTableResults}" status = "i" var="item">
    <tr id = ${i} class="${((i) % 2) == 0 ? 'even' : 'odd'}" name="main">
        <td>${item.events_idx}</td>
        <td>${item.type}</td>   
        <td>${item.object_description}</td>
        <td><g:textField id = "testData[${formIDX}:${formID}:${i}]" name="testData[${formIDX}:${formID}:${i}]" value="${item.value}" optionKey="id" /></td>
    </tr>
</g:each>

However, there seems to be an issue where some sub-tables are not fully populated when the page loads. Refreshing the page sometimes resolves this problem, but not consistently. The console shows that all SQL queries are being executed correctly, and POST requests are returning successfully, yet the page does not update as expected.

If you have any suggestions or insights into what might be causing this inconsistency, please feel free to share. Your help would be greatly appreciated!

I've also attempted to incorporate error handling within the `appendSubTable` function, although it doesn't seem to trigger when issues occur. You can refer to the updated code above for details.

Answer №1

Interestingly, I made a slight adjustment to the post function by moving the table finding process to the beginning of the function instead of within the post itself. Surprisingly, this change seemed to resolve the issue, although the reason behind it remains unclear to me. It would be intriguing to learn why this modification had such an impact!

function appendSubTable(formIDX, scenarioID, $table, formID) {
    var $subTable = $table.find("#" + formIDX).find('td:eq(1)').find("div").find("table")
    var url = "http://localhost:3278/FARTFramework/testScenario/ajaxPopulateSubTables"
    $.post(url, {
        formIDX : formIDX, scenarioID : scenarioID, formID :formID 
    }, function(data) {
        $subTable.append(data)
    }).fail(function() {
        alert("fail")
    });
}

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