Leveraging JavaScript variables conditionally within a JSON object

Question

Leveraging JavaScript variables conditionally within a JSON object

Within the code snippet below, there is a condition written as

(if (epsflag==0)<?php $a=",hide:'true'";?> )

. I am looking to achieve the same condition using JavaScript. Essentially, I want to conditionally utilize a JavaScript variable in my JSON structure. Any assistance with this matter would be greatly appreciated. If my question is unclear, please do not hesitate to let me know.

{display: 'Wave Name', name : 'wavename', sortable : true, align: 'left'<?php echo "$a"?>}

<script type="text/javascript>
function rowdata(epsflag,respflag){
    if (epsflag==0) {
        <?php $a=",hide:'true'";?>
    } else {
        <?php $a=",hide:'false'";?> 
    }

$("#flex1").flexigrid({
    url: myurl, 
    dataType: 'json',
    colModel : [
        {display: 'Nr.', name : 'nr',  sortable : true, align: 'center',width:25},
        {display: 'Datum', name : 'consultationdate',  sortable : true, align: 'left'},
        {display: 'Wave Name', name : 'wavename',  sortable : true, align: 'left'<?php echo "$a"?>},
        {display: 'Name', name : 'respname',  sortable : true, align: 'left'},
        {display: 'E-mail', name : 'email',  sortable : true, align: 'left',width:180},
        {display: 'Telefoon', name : 'telefoon',  sortable : true, align: 'left'},
        {display: 'Medewerker', name : 'consultationwith',  sortable : true, align: 'left'}
    ],  
});

}

javascript json

Answer 1

Answer №1

It appears there may be a misunderstanding regarding the functionality of web technologies.

PHP is essentially a language dedicated to processing strings. Its primary function is string manipulation and generation. In this context, JavaScript can be seen as a large string when interacting with PHP. To simplify this concept, let's replace the JavaScript code with a basic test string like "bla bla bla..":

bla bla bla bla bla bla
<?php $a=",hide:'true'";?>
bla bla bla bla bla bla
<?php $a=",hide:'false'";?>
bla bla bla bla bla bla
<?php echo "$a"?>
bla bla bla bla bla bla

If we streamline this further:

<?php
    $a=",hide:'true'";
    $a=",hide:'false'";
    echo "$a";
?>

Executing this in PHP results in outputting the string:

bla bla bla bla bla bla    // note: no actual output here
bla bla bla bla bla bla
,hide:'false'
bla bla bla bla bla bla

By replacing the "bla bla" with a simplified version of your original content, the output transforms into:

<script type="text/javascript">
function rowdata(epsflag,respflag){
    if (epsflag==0) {
                    // note: missing output from PHP
    }
    else {
                    // note: missing output from PHP
    }

    $("#flex1").flexigrid({
      colModel : [
        {align:'left',hide:'false'}  // logically, always false
      ]
    });
}

At this point, understanding that PHP does not process JavaScript and remains invisible to the browser leads us back to the fundamental distinction between client-side and server-side programming, exemplified elsewhere (source).

Now equipped with a clearer grasp of web mechanisms, how do we address your issue?

Considering your particular case, it seems unnecessary to transmit data back to PHP. Instead, you aim to modify a value within a JavaScript object. Why complicate matters by involving PHP when JavaScript can directly handle these changes? Here's an adjustment solely in JavaScript:

var wavedata = {
    display: 'Wave Name',
    name : 'wavename',
    sortable : true
};

if (epsflag==0) {
    wavedata.hide = 'true';
}
else {
    wavedata.hide = 'false';
}  


$("#flex1").flexigrid({
    colModel : [
        // other data
        wavedata,
        // other data
    ]
});

Alternatively, for maintaining similarity to your existing structure while setting 'true' or 'false' as strings, consider Grundy's suggestion rewritten slightly:

{/* ... */ align: 'left',hide: epsflag==0 ? 'true' : 'false'}

Answer 2

It appears there may be a misunderstanding regarding the functionality of web technologies.

PHP is essentially a language dedicated to processing strings. Its primary function is string manipulation and generation. In this context, JavaScript can be seen as a large string when interacting with PHP. To simplify this concept, let's replace the JavaScript code with a basic test string like "bla bla bla..":

bla bla bla bla bla bla
<?php $a=",hide:'true'";?>
bla bla bla bla bla bla
<?php $a=",hide:'false'";?>
bla bla bla bla bla bla
<?php echo "$a"?>
bla bla bla bla bla bla

If we streamline this further:

<?php
    $a=",hide:'true'";
    $a=",hide:'false'";
    echo "$a";
?>

Executing this in PHP results in outputting the string:

bla bla bla bla bla bla    // note: no actual output here
bla bla bla bla bla bla
,hide:'false'
bla bla bla bla bla bla

By replacing the "bla bla" with a simplified version of your original content, the output transforms into:

<script type="text/javascript">
function rowdata(epsflag,respflag){
    if (epsflag==0) {
                    // note: missing output from PHP
    }
    else {
                    // note: missing output from PHP
    }

    $("#flex1").flexigrid({
      colModel : [
        {align:'left',hide:'false'}  // logically, always false
      ]
    });
}

At this point, understanding that PHP does not process JavaScript and remains invisible to the browser leads us back to the fundamental distinction between client-side and server-side programming, exemplified elsewhere (source).

Now equipped with a clearer grasp of web mechanisms, how do we address your issue?

Considering your particular case, it seems unnecessary to transmit data back to PHP. Instead, you aim to modify a value within a JavaScript object. Why complicate matters by involving PHP when JavaScript can directly handle these changes? Here's an adjustment solely in JavaScript:

var wavedata = {
    display: 'Wave Name',
    name : 'wavename',
    sortable : true
};

if (epsflag==0) {
    wavedata.hide = 'true';
}
else {
    wavedata.hide = 'false';
}  


$("#flex1").flexigrid({
    colModel : [
        // other data
        wavedata,
        // other data
    ]
});

Alternatively, for maintaining similarity to your existing structure while setting 'true' or 'false' as strings, consider Grundy's suggestion rewritten slightly:

{/* ... */ align: 'left',hide: epsflag==0 ? 'true' : 'false'}

Answer 3

Answer №2

Perhaps this could be useful:

function rowData(epsFlag, respFlag){

    $("#flex1").flexigrid(
    {

    url: myURL, 
    dataType: 'json',
    colModel : [
        {display: 'Nr.', name : 'nr',  sortable : true, align: 'center', width:25},
        {display: 'Datum', name : 'consultationdate',  sortable : true, align: 'left'},
        {display: 'Wave Name', name : 'wavename',  sortable : true, align: 'left', hide: (epsFlag==0)},
...

UPDATE

If you prefer not to use a variable inside the object, you can try something like this:

function rowData(epsFlag, respFlag){

    var colModel = {};
    if(epsFlag == 0){
        colModel = [
            {display: 'Nr.', name : 'nr',  sortable : true, align: 'center', width:25},
            {display: 'Datum', name : 'consultationdate',  sortable : true, align: 'left'},
            {display: 'Wave Name', name : 'wavename',  sortable : true, align: 'left', hide: true }
            ...
    }else{
        colModel = [
            {display: 'Nr.', name : 'nr',  sortable : true, align: 'center', width:25},
            {display: 'Datum', name : 'consultationdate',  sortable : true, align: 'left'},
            {display: 'Wave Name', name : 'wavename',  sortable : true, align: 'left', hide: false }
            ...
    }

    $("#flex1").flexigrid(
    {

    url: myURL, 
    dataType: 'json',
    colModel : colModel,
    ...

Answer 4

Perhaps this could be useful:

function rowData(epsFlag, respFlag){

    $("#flex1").flexigrid(
    {

    url: myURL, 
    dataType: 'json',
    colModel : [
        {display: 'Nr.', name : 'nr',  sortable : true, align: 'center', width:25},
        {display: 'Datum', name : 'consultationdate',  sortable : true, align: 'left'},
        {display: 'Wave Name', name : 'wavename',  sortable : true, align: 'left', hide: (epsFlag==0)},
...

UPDATE

If you prefer not to use a variable inside the object, you can try something like this:

function rowData(epsFlag, respFlag){

    var colModel = {};
    if(epsFlag == 0){
        colModel = [
            {display: 'Nr.', name : 'nr',  sortable : true, align: 'center', width:25},
            {display: 'Datum', name : 'consultationdate',  sortable : true, align: 'left'},
            {display: 'Wave Name', name : 'wavename',  sortable : true, align: 'left', hide: true }
            ...
    }else{
        colModel = [
            {display: 'Nr.', name : 'nr',  sortable : true, align: 'center', width:25},
            {display: 'Datum', name : 'consultationdate',  sortable : true, align: 'left'},
            {display: 'Wave Name', name : 'wavename',  sortable : true, align: 'left', hide: false }
            ...
    }

    $("#flex1").flexigrid(
    {

    url: myURL, 
    dataType: 'json',
    colModel : colModel,
    ...

Leveraging JavaScript variables conditionally within a JSON object

Answer №1

Answer №2

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