Develop Reference

how to abort multiple ajax request

By clicking the show data button, my AJAX call is firing again and again the and same data gets added in to the table. Firstly, I want to stop that and secondly is there any way to update the database only with new data if some new data is added inside the database?
var showdata = document.getElementById("showdata");
var btn = document.getElementById("getdata");
btn.addEventListener("click", function() {
var xhttp = new XMLHttpRequest();
xhttp.open("GET", "<?php echo base_url() ?>Appconfig/get_masteradmin_data", false);
xhttp.onload = function() {
var ourData = JSON.parse(xhttp.responseText);
renderHTML(ourData);
};
xhttp.send();
});
function renderHTML(data) {
var html = '';
var i;
for (i = 0; i < data.length; i++) {
html += '<tr>' +
'<td>' + data[i].full_name + '</td>' +
'<td>' + data[i].username + '</td>' +
'<td>' + data[i].designation + '</td>' +
'<td>' + data[i].department + '</td>' +
'<td>' + data[i].official_mobile_no + '</td>' +
'<td>' + data[i].official_email_id + '</td>' +
'<td>' + data[i].select_user_type + '</td>' +
'<td>' + data[i].permission + '</td>' +
'</tr>';
}
showdata.insertAdjacentHTML('beforeend', html);
}

use jquery html() method instead of showdata.insertAdjacentHTML('beforeend', html);

how to append value in td

I am getting dynamic values in table using Datatables. I am getting my desired value in alert, but I want to show that value in table. for that purpose I used .append, .html but no luck. How can I show = my value in <td>. I also try to gave gave td an id e.g <td id="files">
here is my code:
function format(d) {
var str = d.files;
var myarr = str.split(",");
for (var i = 0; i < myarr.length; i++) {
alert(myarr[i]);
$("#files").append("<a href='/uploads/" + myarr[i] + "'>" + myarr[i] + "</a>");
}
// `d` is the original data object for the row
return '<table id="ChildRows" cellpadding="5" cellspacing="0" border="0" style="padding-left:50px;">' +
'<tr>' +
'<td>Contact Person:</td>' +
'<td>' + d.person + '</td>' +
'</tr>' +
'<tr>' +
'<td>Phone:</td>' +
'<td>' + d.phone + '</td>' +
'</tr>' +
'<tr>' +
'<td>Web:</td>' +
'<td>' + d.web + '</td>' +
'</tr>' +
'<tr>' +
'<td>Trade Type:</td>' +
'<td>' + d.ttype + '</td>' +
'</tr>' +
'<tr>' +
'<td>Files:</td>' + '<td id="files">'
'</td>' +
'</tr>' +
'</table>';
}
I hope it will be a easy fix.any help will be highly appreciable

Your issue is that the #files element doesn't exist at the point you attempt to select it. You need to first add that HTML string to the DOM, then append to it.
Alternatively, you could amend the logic which creates that HTML string to include the output of your for loop, like this:
function format(d) {
var str = d.files;
var filesHtml = str.split(",").map(function(file) {
return '' + file + '';
});
return '<table id="ChildRows" cellpadding="5" cellspacing="0" border="0" style="padding-left:50px;">' +
'<tr>' +
'<td>Contact Person:</td>' +
'<td>' + d.person + '</td>' +
'</tr><tr>' +
'<td>Phone:</td>' +
'<td>' + d.phone + '</td>' +
'</tr><tr>' +
'<td>Web:</td>' +
'<td>' + d.web + '</td>' +
'</tr><tr>' +
'<td>Trade Type:</td>' +
'<td>' + d.ttype + '</td>' +
'</tr><tr>' +
'<td>Files:</td>' +
'<td id="files">' + filesHtml + '</td>' +
'</tr>' +
'</table>';
}
var html = format({
person: 'John Smith',
phone: '1234 567890',
web: 'http://google.com',
ttype: 'Foobar',
files: 'a.jpg,b.jpg'
});
$('div').append(html);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div></div>

Generate a simple table with javascript

I dont understand why but I'm getting the wrong body structure. You can see on the image that I get a <tr></tr> and I dont have that on javascript.
I just want a table with 3 columns and up to 10 rows.
What's happening?
My generated html
JavaScript
$('#selectMRPC').change(function () {
//fetch data
var mrpc = $(this).find('option:selected').data('mrpc');
$('#paramBody').empty();
for (var i = 1; i <= 10; i++) {
var field = mrpc["field" + i];
if (field !== undefined) {
var parsedField = field.split('_');
var value = parsedField[0];
var type = parsedField[1];
switch (type) {
case "S":
type = "text";
if (value === '""')
value = null;
break;
case "B":
type = "checkbox";
break;
case "N":
type = "number";
value = parseInt(value);
break;
case "D":
type = "number";
value = parseInt(value);
if (value === '""')
value = null;
break;
}
$('#paramBody').append('<tr>');
$('#paramBody').append('<td>' + i + '</td>');
$('#paramBody').append('<td>' + type + '</td>');
$('#paramBody').append('<td><input name="Fields" type="' + type + '">').val(value);
$('#paramBody').append('</tr>');
}
}
});

store everything in a var then add it to dom :
var html = "";
html += '<tr>';
html += '<td>' + i + '</td>';
html += '<td>' + type + '</td>';
html += '<td><input name="Fields" type="' + type + '" value="' + value +'">';
html += '</tr>';
$('#paramBody').append(html);

You are appending everything to #paramBody, which is incorrect. Consecutively, you need to append/insert data into <tr>. So I would recommend, you concatenate everything together instead of appending.
You need to change
$('#paramBody').append('<tr>');
$('#paramBody').append('<td>' + i + '</td>');
$('#paramBody').append('<td>' + type + '</td>');
$('#paramBody').append('<td><input name="Fields" type="' + type + '">').val(value);
$('#paramBody').append('</tr>');
to
var rowHtml = '<tr>' + '<td>' + i + '</td>' + '<td>' + type + '</td>' + '<td><input name="Fields" type="' + type + '">' + value + '</tr>';
$('#paramBody').append(rowHtml);

append will create an element from the parameter if the given input is not already a valid html string
Make it
$('#paramBody').append('<tr><td>' + i + '</td><td>' + type + '</td><td><input name="Fields" type="' + type + '" value="' +value + '"></tr>');
Or append them one by one (example below)
$( "<tr></tr>" ).append('<td>' + i + '</td>').appendTo( '#paramBody' );
Or create a string first
var html = '<tr>';
html += '<td>' + i + '</td>';
html += '<td>' + type + '</td>';
html += '<td><input name="Fields" type="' + type + '" value="' + value + '">';
html += '</tr>';
$('#paramBody').append(html );

jQuery creating tables, but currently keeps repeating the table under the previous one when submit button is clicked

my jQuery creates tables, but currently it keeps repeating the new tables under the previous ones when 'submit' button is clicked. How do I toggle it so it clears the previous table before showing the new table?
Any help would be great thanks!
<script type="text/javascript">
function call_everybody(){
display_results_table();
display_cyclist_results_table();
display_cyclist2_results_table();
}
function display_results_table() {
$("medal_table").empty();
$('<table id = "results_table">').appendTo('#medal_table');
$.get("sam2.php", { Country_1: $('#Country_1').val(), Country_2: $('#Country_2').val(), queryType: $('#differentOptions').val() },
function (results_obtained) {
$('<tr><td>Rank</td>' +
'<td>Country Name</td>' +
'<td>Population</td>' +
'<td>GDP</td>' +
'<td>Gold</td>' +
'<td>Silver</td>' +
'<td>Bronze</td>' +
'<td>Total</td></tr>').appendTo('#results_table');
for (var i = 0; i <= results_obtained.length; i++) {
$('<tr><td>' + (i+1) + '</td>' +
'<td>' + results_obtained[i].country_name + '</td>' +
'<td>' + results_obtained[i].population + '</td>' +
'<td>' + results_obtained[i].gdp + '</td>' +
'<td>' + results_obtained[i].gold + '</td>' +
'<td>' + results_obtained[i].silver + '</td>' +
'<td>' + results_obtained[i].bronze + '</td>' +
'<td>' + results_obtained[i].total + '</td></tr>').appendTo('#results_table');
}
},'json');
$('</table>').appendTo('#medal_table');
}
function display_cyclist_results_table() {
$("cyclist_table").empty();
$('<table id = "cyclist_results_table">').appendTo('#cyclist_table');
$.get("sam3.php", { Country_1: $('#Country_1').val(), Country_2: $('#Country_2').val(), queryType: $('#differentOptions').val() },
function (cyclist_results_obtained) {
$('<tr><td>Country id</td>' +
'<td>Name</td>' +
'<td>Gender</td>' +
'<td>Sport</td></tr>').appendTo('#cyclist_results_table');
for (var j = 0; j <= cyclist_results_obtained.length; j++) {
$('<tr><td>' + cyclist_results_obtained[j].iso_id + '</td>' +
'<td>' + cyclist_results_obtained[j].name + '</td>' +
'<td>' + cyclist_results_obtained[j].gender + '</td>' +
'<td>' + cyclist_results_obtained[j].sport + '</td></tr>').appendTo('#cyclist_results_table');
}
},'json');
$('</table>').appendTo('#cyclist_table');
}
function display_cyclist2_results_table() {
$("cyclist2_table").empty();
$('<table id = "cyclist2_results_table">').appendTo('#cyclist2_table');
$.get("sam4.php", { Country_1: $('#Country_1').val(), Country_2: $('#Country_2').val(), queryType: $('#differentOptions').val() },
function (cyclist2_results_obtained) {
$('<tr><td>Country id</td>' +
'<td>Name</td>' +
'<td>Gender</td>' +
'<td>Sport</td></tr>').appendTo('#cyclist2_results_table');
for (var j = 0; j <= cyclist2_results_obtained.length; j++) {
$('<tr><td>' + cyclist2_results_obtained[j].iso_id + '</td>' +
'<td>' + cyclist2_results_obtained[j].name + '</td>' +
'<td>' + cyclist2_results_obtained[j].gender + '</td>' +
'<td>' + cyclist2_results_obtained[j].sport + '</td></tr>').appendTo('#cyclist2_results_table');
}
},'json');
$('</table>').appendTo('#cyclist2_table');
}
</script>
<title>sam.php</title>
</head>
<body>
<form name="form">
<table>
<tr><td><input name="Country_1" id="Country_1" value="GBR" type="text"></td></tr>
<tr><td><input name="Country_2" id="Country_2" value="USA" type="text"></td></tr>
<td><input id='toggle' type="button" value="Cyclist Comparison" onclick="call_everybody()"/></td></tr>
</table>
</form>
<div id = "toggle_table">
<div id="medal_table"></div>
<div id="cyclist_table"></div>
<div id="cyclist2_table"></div>
</div>
</body>

You need to add -
$('#results_table').remove();
Prior to -
$('<table id = "results_table">').appendTo('#medal_table');

Add class to html element dynamic

I'm building a dynamic table in html with javascript. Here is a piece of the javascript code.
var tr = $('<tr/>');
$(tr).append('<td>' + p1 + '</td>');
$(tr).append('<td>' + p2 + '</td>');
$(tr).append('<td>' + p3 + '</td>');
$(tr).append('<td>' + p4 + '</td>');
$(tr).append('<td>' + item.status + '</td>');
$(tr).append('<td><button class=\"btn\" onclick=\"join(' + item.gameId + ');\">Join</button></td>');
$('tbody').append(tr);
I want to add a class (either 'error' or 'success') to the row element.
I tried
tr.className = "success";
This didn't work.

Just use
tr.addClass("success")
You're caching your jquery elem in var tr so there's no reason to call $(tr) just use tr

This should work:
$(tr).addClass("success");

It seems you're using jQuery, you should try using: $(tr).addClass('success')
Also you're doing too many unnecessary appends, you could optimize your code to:
var tr = '<tr><td>' + p1 + '</td>' +
'<td>' + p2 + '</td>' +
'<td>' + p3 + '</td>' +
'<td>' + p4 + '</td>' +
'<td>' + item.status + '</td>' +
'<td><button class=\"btn\" onclick=\"join(' +
item.gameId +
');\">Join</button></td></tr>';
$('tbody').append(tr);