How to reorder columns with Knex? - javascript

I am pulling all of my data from an Sqlite3 table using Knex, electron and JavaScript and I wish to reorder the columns either on the Knex query or in the HTML/JavaScript side.
My sqlite3 db has the following header data:
id|Role|Password|Reference
With the following code, the table displays in the following order:
Password|Reference|Role|id
I have attempted to utilize the .orderBy method in Knex and have also attempted to reorder in JavaScript, but I cannot seem to reorder the columns.
The Electron side of things, I have:
ipcMain.on('getUserTable:all', (event) => {
let getUserTable =
knex('User').select(['id','Role','Reference','Password']).orderBy('Role');
getUserTable.then(function(tableData){
newWin.webContents.send("userResultSent", tableData);
});
});
In the HTML side of things, I have:
ipc.on('userResultSent', (event, tableData) => {
var html = '<table>';
html += '<tr>';
for( var j in tableData[0] ) {
html += '<th>' + j + '</th>';
}
html += '</tr>';
for( var i = 0; i < tableData.length; i++) {
html += '<tr>';
for( var j in tableData[i] ) {
html += '<td>' + tableData[i][j] + '</td>';
}
}
html += '</table>';
document.getElementById('db_output_container').innerHTML = html;
});
I wish to be able to query the db so that the array displays in the exact order as in the table.

The problem with your current approach is that object are unordered bags of properties. So it does not matter how order your columns - properties order is not guaranteed.
If you need specific order you could use Array instead.
Since you have general code to display tabular data you could do the following
ipcMain.on('getUserTable:all', (event) => {
const columns = ['id','role','reference','password']
let getUserTable =
knex('User').select(columns).orderBy('role');
getUserTable.then(function(tableData){
newWin.webContents.send("userResultSent", {columns, tableData});
});
});
When creating html
ipc.on('userResultSent', (event, {columns, tableData}) => {
var html = '<table>';
html += '<tr>';
columns.forEach(column => {
// if you want to capitalize names just do it here
html += '<th>' + column + '</th>';
})
html += '</tr>';
for( var i = 0; i < tableData.length; i++) {
html += '<tr>';
columns.forEach(column => {
html += '<td>' + tableData[i][column] + '</td>';
})
html += '</tr>';
}
html += '</table>';
document.getElementById('db_output_container').innerHTML = html;
})

At the end of the second for loop, you should close the tr tag. Indeed, you open it right after the second for loop but you don't close it.
I haven't tested yet but it should work.
Your html file should looks like this.
ipc.on('userResultSent', (event, tableData) => {
var html = '<table>';
html += '<tr>';
for( var j in tableData[0] ) {
html += '<th>' + j + '</th>';
}
html += '</tr>';
for( var i = 0; i < tableData.length; i++) {
html += '<tr>';
for( var j in tableData[i] ) {
html += '<td>' + tableData[i][j] + '</td>';
}
html += '</tr>'; /* i added this line here */
}
html += '</table>';
document.getElementById('db_output_container').innerHTML = html;
});

Related

Downloading CSV contents via Ajax and PHP

I am trying to download CSV contents via PHP script hosted on the server.
This is the jquery code that executes and creates a table:
$(document).ready(function() {
$("#btnSubmit").click(function(){
$.ajax({
type: 'GET',
url: 'http://mydomaincom/wp-content/uploads/get-csv.php',
data: null,
success: function(text) {
var fields = text.split(/\n/);
fields.pop(fields.length-1);
var headers = fields[0].split(','),
html = '<table>';
html += '<tr>';
for(var i = 0; i < headers.length; i += 1) {
html += '<th scope="col">' + headers[i] + '</th>';
}
html += '</tr>';
var data = fields.slice(1, fields.length);
for(var j = 0; j < data.length; j += 1) {
var dataFields = data[j].split(',');
html += '<tr>';
html += '<td>' + dataFields[0] + '</td>';
html += '<td>' + dataFields[1] + '</td>';
html += '<td>' + dataFields[2] + '</td>';
html += '</tr>';
}
html += '</table>';
$(html).appendTo('body');
}
});
});
});
Contents of get-csv.php file:
<?php
header('Content-Type: text/plain');
$csv = file_get_contents('http://mydomaincom/wp-content/uploads/csv-samples.csv');
echo $csv;
?>
Here is the code for button:
<!-- Begin Button -->
<div class="demo">
<input id = "btnSubmit" type="submit" value="Get It"/>
</div>
<!-- End Button -->
From browser:
I can access http://mydomaincom/wp-content/uploads/get-csv.php - no issues
I can access http://mysitecom/wp-content/uploads/csv-samples.csv - no issues
When I click on button nothing happens.
Thanks
Below I tried to put together a working snippet where you can possibly see how it works when it works ...
$(document).ready(function () {
$("#btnSubmit").click(function () {
$.ajax({
type: 'GET',
// url: 'http://mydomaincom/wp-content/uploads/get-csv.php',
// url: 'https://jsonplaceholder.typicode.com/users', // --> JSON
url: "https://data.cdc.gov/api/views/45um-c62r/rows.csv",
data: null,
success: function (text) {
var fields = text.split(/\n/);
fields.pop(fields.length - 1);
var headers = fields[0].split(','), html = '<table>';
html += '<tr>';
for (var i = 0; i < (headers.length,3); i += 1) {
html += '<th scope="col">' + headers[i] + '</th>';
}
html += '</tr>';
var data = fields.slice(1, fields.length);
for (var j = 0; j < data.length; j += 1) {
var dataFields = data[j].split(',');
html += '<tr>';
html += '<td>' + dataFields[0] + '</td>';
html += '<td>' + dataFields[1] + '</td>';
html += '<td>' + dataFields[2] + '</td>';
html += '</tr>';
}
html += '</table>';
$(html).appendTo('body');
}
});
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button id="btnSubmit">get data</button>
After looking around a bit further I did actually find some publicly available CSV data ("Rates of TBI-related Emergency Department Visits, Hospitalizations, and Deaths - United States, 2001 – 2010" from the U.S. Department of Health & Human Services) and I am now using that to demonstrate the AJAX process.
So, your code basically works. It could be simplified of course but that is not the point. I guess that the problems you encounter with your site are probably CORS-related.

iterate through a html table and get row number for each row in javascript

I want to be able to iterate though a html table, get the number of rows, and output the row number of each row on the leftmost field. However, I have 2 problems: not being able to get the number of rows and not getting the desired output.
$(document).ready(function($) {
function create_html_table(tbl_data) {
var tbl = '';
tbl += '<table id ="datarepo">';
tbl += '<thead>';
//Some headers
tbl += '</thead>';
tbl += '<tbody>';
$.each(tbl_data, function(index, val) {
/* This is what I want to use to get the number of rows in the table.
However, uncommenting the following line will cause the whole table to disappear altogether.*/
// var numberrows = document.getElementById("datarepo").rows.length;
// Using static value here instead of numberrows because it is not working.
for (i = 1; i <= 2; i++) {
tbl += '<tr>';
tbl += '<td >' + i + '</td>';
tbl += '<td ><div col_name="filename">' + val['filename'] + '</div></td>';
tbl += '</tr>';
}
});
tbl += '</tbody>';
tbl += '</table>';
}
}
Desired output:
What I got:
You can just get rid of your for loop and use the index of the each loop plus one:
$.each(tbl_data, function(index, val) {
tbl += '<tr>';
tbl += '<td >' + (index + 1) + '</td>';
tbl += '<td ><div col_name="filename">' + val['filename'] + '</div></td>';
tbl += '</tr>';
});

Getting Correct Child in Firebase Web

I have the following JS code.
var database = firebase.database();
database.ref().child('server/user-search').once('value', function(snapshot) {
if (snapshot.exists()) {
var content = '';
snapshot.forEach(function(child) {
var val = child.val();
content += '<tr>';
content += '<td>' + val.deviceCodename + '</td>';
content += '</tr>';
});
$('#ex-table').append(content);
}
});
This is the layout I have. Its the child within user-search. Thanks for the help
You have an extra node "0" between the "user-search" UID and the deviceXXX nodes.
If I make the assumption that this extra node is always "0", you should do something like the following:
var database = firebase.database();
database.ref().child('server/user-search').once('value', function (snapshot) {
if (snapshot.exists()) {
var content = '';
snapshot.forEach(function (child) {
var val = child.val()['0'];
content += '<tr>';
content += '<td>' + val.deviceCodename + '</td>';
content += '</tr>';
});
$('#ex-table').append(content);
}
});

Appending table, tr, td tags to innerHTML does not create table rows

var menuStarters = [["chicken", "5.00"], ["salad", "4.11"], ["soup", "3.88"]];
document.getElementById("menu").innerHTML += '<table>';
for (var i = 0; i < menuStarters.length; i++)
{
document.getElementById("menu").innerHTML += '<tr><td>' + menuStarters[i][0] + '</td><td>' + menuStarters[i][1] + '</td></tr>';
}
document.getElementById("menu").innerHTML += '</table>';
I'm sure I'm probably missing something obvious.
You can't have partial tags in a document. Adding an opening <table> to the innerHTML will cause a full (closed) tag to be inserted. Subsequent additions are outside the table, where tr and td are illegal.
Build the string first, then add it to the container:
var menuStarters = [
["chicken", "5.00"],
["salad", "4.11"],
["soup", "3.88"]
];
var thtml = '<table>';
for (var i = 0; i < menuStarters.length; i++) {
thtml += '<tr><td>' + menuStarters[i][0] + '</td><td>' + menuStarters[i][1] + '</td></tr>';
}
thtml += '</table>';
document.getElementById("menu").innerHTML += thtml
<div id="menu"></div>
I've created a fiddle here
https://jsbin.com/jeguka/edit?html,js,output
var menuStarters = [["chicken", "5.00"], ["salad", "4.11"], ["soup", "3.88"]];
var html = '<table>';
menuStarters.forEach(function(item, index){
html += '<tr><td>' + item[0] + '</td><td>' + item[1] + '</td></tr>';
});
html += '</table>';
document.getElementById("menu").innerHTML = html;

Create a table in javascript from returned JSON object by http get

This is the function in my javascript. Triggered by an onclick function by an another function.
function getValueUsingParentTag(){
var tv_type = [];
var screen_size = [];
var connectivity = [];
var features = [];
var chkArray = [tv_type,screen_size,connectivity,features];
$("#tvtype input:checked").each(function() {
tv_type.push($(this).val());
});
$("#screensize input:checked").each(function() {
screen_size.push($(this).val());
});
$("#connection input:checked").each(function() {
connectivity.push($(this).val());
});
$("#feature input:checked").each(function() {
features.push($(this).val());
});
console.log(chkArray);
//alert(JSON.stringify(chkArray));
alert('hello');
$.get("output-tv.php",{tv_type:tv_type,screen_size:screen_size,connectivity:connectivity,features:features},function(chkArray){
});
}
This is the sample json object returned
{"result":[
{"product_code":"B2810","tv_name":"32B2810","size":"32","tv_type":"INTERNET TV"},
{"product_code":"B2610","tv_name":"48B2610","size":"48","tv_type":"INTERNET TV"}
]}
I need to create a table in javascript based on the json object returned. I dont know how. Please Help.
following function builds the table in a string.
function getTable(data) {
var html = "";
html += "<table><tr><td>product_code</td><td>tv_name</td><td>size</td><td>tv_type</td></tr>";
html += "<tr>";
for(var i = 0, ceiling = data.result.length; i < ceiling; i++) {
var row = data.result[i];
html += "<td>" + row.product_code + "</td>";
html += "<td>" + row.tv_name + "</td>";
html += "<td>" + row.size + "</td>";
html += "<td>" + row.tv_type + "</td>";
}
html += "</tr>";
html += "</table>";
return html;
}
suppose you have a div with id mydiv, you can add the table to this div with following code:
document.getElementById("mydiv").innerHTML = getTable(data);
Here's a simple Javascript only loop example:
http://jsfiddle.net/mCLVL/
var tableData = {"result":[
{"product_code":"B2810","tv_name":"32B2810","size":"32","tv_type":"INTERNET TV"},
{"product_code":"B2610","tv_name":"48B2610","size":"48","tv_type":"INTERNET TV"}
]};
var tableHTML = "<table>";
for (var i = 0; i < tableData["result"].length; i++) {
tableHTML += "<tr>";
tableHTML += "<td>" + tableData["result"][i]["product_code"] + "</td>";
tableHTML += "<td>" + tableData["result"][i]["tv_name"] + "</td>";
tableHTML += "<td>" + tableData["result"][i]["size"] + "</td>";
tableHTML += "<td>" + tableData["result"][i]["tv_type"] + "</td>";
tableHTML += "</tr>";
}
tableHTML += "</table>";
console.log(tableHTML);
It will be so simple by using JSRender. I made a fiddle using jsrender template check it.
Using JSRender Fiddle

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