Databases
StackOverflow2013
Postsdbo
POWhy does this jQuery .post fail to return a result, and how can I debug in Firebug?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhy does this jQuery .post fail to return a result, and how can I debug in Firebug?
    primarykey
    data
    text
    <p>This script used to work fine, so I am mystified as to why it's not working now; but it uses .post in a simple php call to retrieve a data record given two keys, mndx and sndx, both of which contain valid data. </p> <pre><code> function fetchgenotype() { // here's where we use an Ajax function to fetch the allele values without reloading the page. // Get the index number of the genotype record to retrieve; retrieve it; populate the alleles. var mndx, sndx = 0; mndx = $('#marker').val(); if (Study_selected) { sndx = $('#stylabid').val(); } else { sndx = $('#pjtlabid').val(); } // for debugging... //alert('sndx='+sndx+', mndx='+mndx); // This is the cryptic jQuery 'magic' that fetches the genotype values when the // Fetch button is clicked, and displays the values fetched. $.post("fetchAlleles.php", {mndx: mndx, sndx: sndx}, function(result) { // The .each method used on the return object is the key to displaying multiple // run dates, and genotype values, associated with a sample. i=0; $.post("fetchAlleles.php", {'mndx': mndx, 'sndx': sndx}, function(result) { // this works for a single return value //$('#allele_1_1').get(0).value = result[0].allele1; //$('#allele_1_2').get(0).value = result[0].allele2; //$('#run_date1').get(0).value = result[0].run_date; // The .each method used on the return object is the key to displaying multiple // run dates, and genotype values, associated with a sample. i=0; $.each(result,function() { if (i==0) { $('#allele_1_1').val(this.allele1); $('#allele_1_2').val(this.allele2); $('#run_date1').val(this.run_date); } else if (i==1) { $('#allele_2_1').val(this.allele1); $('#allele_2_2').val(this.allele2); $('#run_date2').val(this.run_date); } else if (i==2) { $('#allele_3_1').val(this.allele1); $('#allele_3_2').val(this.allele2); $('#run_date3').val(this.run_date); } i=i+1; }) } ); } </code></pre> <p>I have attempted to use Firebug to step into the code, but in the above code as soon as it steps past the .post line, it says result is undefined.</p> <p>The relevant part of the php script is: </p> <pre><code> $sql = "SELECT allele1, allele2, run_date FROM geno.genotypes WHERE markers_id=".$mndx." AND gsamples_id=".$sndx; // create array to hold results $obj_arr = array(); $fetchresult = pg_exec($dbconnect, $sql); if ($fetchresult) { while ($obj = pg_fetch_object($fetchresult)) // Add this object to our array of objects to return if (!array_push($obj_arr,$obj)) { echo("Error pushing results onto obj_arr"); showerror(0,"Failed to connect to database",'fetchAlleles',38,"Failed in line 38"); exit; } // for debugging //print_r($obj_arr); } else { echo "(25) Failed to retrieve results.&lt;BR&gt;SQL: ".$sql."&lt;/br&gt;"; } // It appears necessary to return the array as json encapsulated. echo json_encode($obj_arr); </code></pre> <p>Any help much appreciated! --rixter</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USrixter
    1. USrixter
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COInspect the response from php for additional characters before or after the json.
      singulars
      1. POWhy does this jQuery .post fail to return a result, and how can I debug in Firebug?
      1. USKevin B
    2. COKevin B: Can't! The debugger will not step into the php script, so the result is never defined. Must be something wrong with the .post syntax?
      singulars
      1. POWhy does this jQuery .post fail to return a result, and how can I debug in Firebug?
      1. USrixter
    3. COi don't know, but you can inspect the php response by using a console that sees the requests, such as firebug or google chrome.
      singulars
      1. POWhy does this jQuery .post fail to return a result, and how can I debug in Firebug?
      1. USKevin B
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload