How to add option/ ListItem to dropdownlist dynamically - javascript

I need to build my DDL dynamically,I get info from DB using JSON (I get the data with no problem) but couldn't show my data in my DDL...
I tried three different ways, nothing changed.. What am I doing wrong ?
//HTML
<asp:DropDownList ID="productDDL" runat="server" CssClass="ddl"></asp:DropDownList>
//Javascript
function creatDDL(data) {
var obj = $.parseJSON(data.Data);
for (var i = 0; i < obj.length; i++) {
$("#productDDL").append("<option>" + obj[i].id + "' - '" + obj[i].name + "</option>");
$("#productDDL").append("<option>"+obj[i].id + "' - '" + obj[i].name+"</option>");
$("#productDDL").append($("<option></option>").html(obj[i].id + "' - '" + obj[i].name));
}
}

I like your third attempt best. Assuming your data is in order, you just need to brush up on the jQuery API.
Here's a working version of what I gather you're trying to do:
function createDDL(data) {
var options = $.parseJSON(data.Data);
$.each(options, function(n, option) {
var $option = $('<option />').text(option.name).val(option.id);
$("#productDDL").append($option);
});
}
Fiddle: http://jsfiddle.net/klenwell/Esr5q/

Related

Razor JQuery Populate Drop Down from Model array

I am using a WebGrid to allow CRUD on my database (using MVC and EF entities). The grid works and filters they way I want it to. There are two columns that use dropdowns to display a value tied to another table (Projects and People) and these both work well for edits/ updates. I am using JQuery for an add new row and want the new row to have select fields like the grid does (so that the user can just find the person by name instead of having to enter the ID for example). I am referencing this post from another similar question, but when I implement the code I get a syntax error that I'm having trouble understanding.
Here is my scripting on the view side that shows my failed attempt. I'm creating an array from the project repository (Text is the name of the project and Value is the ID field), and populating it with the model values: Model.Projects, and then in the add row function I want to loop through the array to add in the options.
<script type="text/javascript">
var ProjectArray = new Array();
#foreach (var proj in Model.projects)
{
#:ProjectArray.push(Text: "#proj.Text", Value: "#proj.Value");
}
</script>
<script type="text/javascript">
$(function ()
{
$('body').on("click", ".add", function () {
var SelectedProject = "#Model.ProjectID";
var newRow = $('.save').length;
console.log('newRow = ' + newRow);
if (newRow == 0) {
var index = "new"+$("#meetingList tbody tr").length + 1;
var ProjectID = "ProjectID_" + index;
var Date = "Date_" + index;
var Attendees = "Attendees_" + index;
var Phase = "Phase_" + index;
var PeopleID = "PeopleID_" + index;
var Save = "Save _" + index;
var Cancel = "Cancel_" + index;
var tr = '<tr class="alternate-row"><td><span> <input id="' + ProjectID + '" type="select"/></span></td>' +
#* This is where I use the array to add the options to the select box*#
ProjectArray.forEach(function (item) {
if (item.Value == SelectedProject) { '<option selected="selected" value="' + item.Value + '">' + item.Text + '</option>' }
else { '<option value="' + item.Value + '">' + item.Text + '</option>' }
+
});
---remaining script omitted----
'<td><span> <input id="' + PeopleID + '" type="text" /></span></td>' +
'<td><span> <input id="' + Date + '" type="date" /></span></td>' +
'<td><span> <input id="' + Attendees + '" type="text" /></span></td>' +
'<td><span> <input id="' + Phase + '" type="text" /></span></td>' +
'<td> SaveCancel</td>' +
'</tr>';
console.log(tr);
$("#meetingList tbody").append(tr);
}
});
I am not sure how to parse the error, but the page source looks like this when creating my client side array:
var ProjectArray = new Array();
ProjectArray.push(Text: "Select Project", Value: ""); //<-- ERROR HERE:
ProjectArray.push(Text: "010111.00", Value: "74");
ProjectArray.push(Text: "013138.00", Value: "2");
So the model getting into the client side works (the text and value pairs are correct), but the error I get is for the first array.push line: missing ) after the argument list. I have played with moving this code block around, putting it in a separate <script> tag and the error likewise follows it around, always on the first array.push line. And regardless of where it is, the rest of my script functions no longer work. I think it must be something silly but I just am not seeing what I'm doing wrong.
The option list does not populate into something I can ever see, it just renders out on the page source as the javascript loop:
var tr = '<tr class="alternate-row"><td><span> <input id="' + ProjectID + '" type="select"/></span></td>' +
ProjectArray.forEach(function (item) {
if (item.Value == SelectedProject) { '<option selected="selected" value="' + item.Value + '">' + item.Text + '</option>' }
else { '<option value="' + item.Value + '">' + item.Text + '</option>' }
+
}); //-- Unexpected token here
And with the push array in its separate script block I get a second error that the last } is an unexpected token. This is some javascripting error I'm sure. But where it is an how to do this are beyond me right now.
I'm not used to javascript, and poor syntax leads to the vague errors I was getting. The first problem was fixed by adding the { . . . } around the array values. Then I created a function to create the arrays I need for people and projects as well as a function to take an array and create the option list to clean up the view code:
function createProjectArray() {
var ProjectArray = new Array();
#foreach (var proj in Model.projects)
{
if (proj.Value != "") {
#:ProjectArray.push({ Text: "#proj.Text", Value: "#proj.Value" });
}
}
return ProjectArray;
}
function createPeopleArray() {
var PeopleArray = new Array();
#foreach (var person in Model.people)
{
if (person.Value != "") {
#:PeopleArray.push({ Text: "#person.Text", Value: "#person.Value" });
}
}
return PeopleArray;
}
function SelectOptionsString(MyArray, SelectedValue) {
console.log(MyArray);
var OptionsList = "";
MyArray.forEach(item => {
if (item.Value == SelectedValue) { OptionsList += '<option
selected="selected" value="' + item.Value + '">' + item.Text + '</option>'; }
else { OptionsList += '<option value="' + item.Value + '">' + item.Text
+ '</option>'; }
})
return OptionsList;
}
Taking this approach allowed me to more easily parse the code and find the syntax errors. The Array.forEach syntax was an interesting hurdle, and this site helped me test out my syntax to eventually get it working as above.
So the server creates the javascript lines to create the array, and then I use the array to create my dropdown options list. This cleans up the add row function code nicely:
$('body').on("click",".addrow", function() {
var SelectedProject = "#Model.ProjectID";
var ProjectArray = createProjectArray();
var ProjectOptions = "";
ProjectOptions = SelectOptionsString(ProjectArray, SelectedProject);
var PeopleArray = createPeopleArray();
var PeopleOptions = "";
PeopleOptions = SelectOptionsString(PeopleArray, "");
var tr = '<tr class="alternate-row"><td><span> <select id="' +
ProjectID + '>' + ProjectOptions + '</select></span></td>' +
'<td><span> <select id="' + PeopleID + '>' + PeopleOptions +
'</select></span></td>' + '</tr>'
$("#myWebGrid tbody").append(tr);
});
And it also allows for some potential code reuse.

How to send a javascript array to php [duplicate]

This question already has answers here:
How to pass data from Javascript to PHP and vice versa? [duplicate]
(7 answers)
Closed 4 years ago.
I have an array named "seat" in my javascript file.It is used to store the seat numbers when a user clicks on a seat in a theater layout.In my function,I've used a window alert to show the user his selected seats,and when he clicks OK button,I want to send these booked seats(values in my array) to a php file named "confirm".
Here is the javascript function.
var init = function (reservedSeat) {
var seat = [], seatNo, className;
for (i = 0; i < settings.rows; i++) {
for (j = 0; j < settings.cols; j++) {
seatNo = (i + j * settings.rows + 1);
className = settings.seatCss + ' ' + settings.rowCssPrefix + i.toString() + ' ' + settings.colCssPrefix + j.toString();
if ($.isArray(reservedSeat) && $.inArray(seatNo, reservedSeat) != -1) {
className += ' ' + settings.selectedSeatCss;
}
seat.push('<li class="' + className + '"' +
'style="top:' + (i * settings.seatHeight).toString() + 'px;left:' + (j * settings.seatWidth).toString() + 'px">' +
'<a title="' + seatNo + '">' + seatNo + '</a>' +
'</li>');
}
}
$('#place').html(seat.join(''));
};
$('.' + settings.seatCss).click(function () {
if ($(this).hasClass(settings.selectedSeatCss)){
alert('This seat is already reserved!');
}
else{
$(this).toggleClass(settings.selectingSeatCss);
}
});
$('#btnsubmit').click(function() {
var seat = [], item;
$.each($('#place li.' + settings.selectingSeatCss + ' a'), function (index, value) {
item = $(this).attr('title');
seat.push(item);
});
window.alert(seat);
$_POST('confirm.php', {seat: seat})
})
<form method="POST" action="confirm.php">
<div align="center"><input type="Submit" id="btnsubmit" value="Submit" /></div>
</form>
And this is my php code.
$seat = "";
if(isset($_POST['seat']))
{
$seat = $_POST["seat"];
print_r($seat);
}
When this is executed I get the window alert,but the values stored in the array does not pass to the php file.Is there something wrong with this code?Please help!I'm stuck here!!!
$_POST isn't a built-in method, and jQuery doesn't provide a method like that either-- you can't just "set" the values into the $_POST array like this.
To post using jQuery, you would do something like the following, including a handler for data returning from the server (if you have any):
$.post("confirm.php", { seat: seat})
.done(function(data){
alert('Received data from server: ' + data);
});
You need to send the data to your PHP script, this does nothing in your JS code:
$_POST('confirm.php', {seat: seat})
use something like jQuery post method or vanilla JS XMLHttpRequest

Adding a table from database with javascript

I am seeking help trying to add a new table in my third function called ingredients. I am not very familiar with javascript so I tried to duplicate code from newDosage which is similar to what I need to do. Unfortunately, right now all I see is 0, 1, or 2 and not the actual text from the ingredient table. If anyone can help me correctly call the table, it would be greatly appreciated. Thank you.
Below is my code. The first function pulls the database, the second function uses the results and the third function is where I have tried to add the ingredient table.
function listTreatmentDb(tx) {
var category = getUrlVars().category;
var mainsymptom = getUrlVars().mainsymptom;
var addsymptom = getUrlVars().addsymptom;
tx.executeSql('SELECT * FROM `Main Database` WHERE Category="' + category +
'" AND Main_Symptom="' + mainsymptom + '" AND Add_Symptom="' + addsymptom + '"',[],txSuccessListTreatment);
}
function txSuccessListTreatment(tx,results) {
var tubeDest = "#products";
var len = results.rows.length;
var treat;
for (var i=0; i < len; i = i + 1) {
treat = results.rows.item(i);
$("#warning").append("<li class='treatment'>" + treat.Tips + "</li>");
$("#warning-text").text(treat.Tips);
$('#warning').listview('refresh');
//console.log("Specialty Product #1: " + treat.Specialty1);
if(treat.Specialty1){
$("#products").append(formatProductDisplay('specialty1', treat.Specialty1, treat.PurposeSpecialty1, treat.DosageSpecialty1, '1'));
}
if(treat.Specialty2){
$("#products").append(formatProductDisplay('specialty2', treat.Specialty2, treat.PurposeSpecialty2, treat.DosageSpecialty2, '0'));
}
}
}
function formatProductDisplay(type, productName, productPurpose, productDosage, Ingredients, aster){
var newDosage = productDosage.replace(/"\n"/g, "");
if(aster=='1'){ productHTML += "*" }
productHTML+= "</div>" +
"</div>" +
"<div class='productdose'><div class='label'>dosage:</div>" + newDosage + "</div>" +
"<div class='productdose'><div class='label'>ingredients:</div>" + Ingredients +
"</div></li>"
return productHTML;
}
You are missing an argument when you call formatProductDisplay(). You forgot to pass in treat.Ingredient.
Change:
$("#products").append(formatProductDisplay('specialty1', treat.Specialty1, treat.PurposeSpecialty1, treat.DosageSpecialty1, '1'));
To:
$("#products").append(formatProductDisplay('specialty1', treat.Specialty1, treat.PurposeSpecialty1, treat.DosageSpecialty1, treat.Ingredients, '1'));
Also do the same thing to the similar 'Specialty2' line right below it.

JQueryUI selectmenu - How to add more options

Through javascript how can I add more options to a dropdown selectmenu?
Currently trying the following with no luck:
for (i = 0; i < json.powerDropDownItems.length; i++) {
//$('#powerSelect').append($("<option></option>").attr("value", json.powerDropDownItems[i]).text(json.powerDropDownItems[i]));
$('#powerSelect').selectmenu("value", "nice name");
//$('#powerSelect').appendTo("<option>" + json.powerDropDownItems[i] + "</option>");
}
$('#powerSelect').selectmenu("refresh");​
UPDATE
Thanks to naveen, I got it working (also added code to clear the list). Here is my following code:
service.getPowerDropDowns(productEC, $('#mountSelect').val(), function (response) {
var json = $.parseJSON(response.value);
var options = [];
// Clear the options first
$("#powerSelect option").each(function(index, option) {
$(option).remove();
});
options.push("<option value=''>Choose</option>");
for (i = 0; i < json.powerDropDownItems.length; i ++)
{
options.push("<option value='" + json.powerDropDownItems[i] + "'>" + json.powerDropDownItems[i] + "</option>");
}
$('#powerSelect').append(options.join("")).selectmenu();
$('#powerSelect').selectmenu('enable');
});
This will work
$(function() {
var options = [];
for (i = 0; i < json.powerDropDownItems.length; i++) {
options.push("<option value='" + json.powerDropDownItems[i] + "'>" + json.powerDropDownItems[i] + "</option>");
}
//append after populating all options
$('#powerSelect')
.append(options.join(""))
.selectmenu();
});​
Demo: http://jsfiddle.net/codovations/p863Q/
Depends on the version.
https://github.com/jquery/jquery-ui/tree/selectmenu uses refresh method
https://github.com/fnagel/jquery-ui/tree/selectmenu uses selectmenu() like naveen described.

post data from table row like json format

this is related to my last question(
NOTE: I already got some good answers there). I'm doing a program that will filter. I didn't include this question because i thought that it is easier for me to add text as long as i know how to get the data from the row. But to my dismay, I wasn't able to code a good program til now.
Im currently using this javascript code (thanks to Awea):
$('#out').click(function(){
$('table tr').each(function(){
var td = '';
$(this).find('option:selected').each(function(){
td = td + ' ' + $(this).text();
});
td = td + ' ' + $(this).find('input').val();
alert(td);
});
})
my question is: How to add text before the data from the row? like for example, this code alert
the first row like data1.1 data1.2 data1.3,
then the second row like data2.1 data2.2 data2.3,
I want my output to be displayed like this
[
{"name":"data1.1","comparison":"data1.2", "value":"data1.3"},
{"name":"data2.1","comparison":"data2.2", "value":"data2.3"},
{"name":"data3.1","comparison":"data3.2", "value":"data3.3"}
{.....and so on......}]
but before that happen, i want to check if all the FIRST cell in a row is not empty. if its empty, skip that row then proceed to next row.
is there somebody can help me, please...
Building on my answer to your previous question, see http://jsfiddle.net/evbUa/1/
Once you have your data in a javascript object (dataArray in my example), you can write the JSON yourself, per my example, but you will find it much easier to use a library such as JSON-js (see this also).
// object to hold your data
function dataRow(value1,value2,value3) {
this.name = value1;
this.comparison = value2;
this.value = value3;
}
$('#out').click(function(){
// create array to hold your data
var dataArray = new Array();
// iterate through rows of table
for(var i = 1; i <= $("table tr").length; i++){
// check if first field is used
if($("table tr:nth-child(" + i + ") select[class='field']").val().length > 0) {
// create object and push to array
dataArray.push(
new dataRow(
$("table tr:nth-child(" + i + ") select[class='field']").val(),
$("table tr:nth-child(" + i + ") select[class='comp']").val(),
$("table tr:nth-child(" + i + ") input").val())
);
}
}
// consider using a JSON library to do this for you
for(var i = 0; i < dataArray.length; i++){
var output = "";
output = output + '{"name":"data' + (i + 1) + '.' + dataArray[i].name + '",';
output = output + '"comparison":"data' + (i + 1) + '.' + dataArray[i].comparison + '",';
output = output + '"value":"data' + (i + 1) + '.' + dataArray[i].value + '"}';
alert(output);
}
})
There are two things you need to do here. First get the data into an array of objects, and secondly get the string representation.
I have not tested this, but it should give you a basic idea of what to do.
Edit Please take a look at this JS-Fiddle example I've made. http://jsfiddle.net/4Nr9m/52/
$(document).ready(function() {
var objects = new Array();
$('table tr').each(function(key, value) {
if($(this).find('td:first').not(':empty')) {
//loop over the cells
obj = {};
$(this).find('td').each(function(key, value) {
var label = $(this).parents('table').find('th')[key].innerHTML;
obj[label] = value.innerHTML;
});
objects.push(obj);
}
});
//get JSON.
var json = objects.toSource();
$('#result').append(json);
});
var a = [];
a[0] = "data1.1 data1.2 data1.3"
a[1] = "data1.6 data1.2 data1.3"
var jsonobj = {};
var c = []
for (var i = 0;i
alert(c); //it will give ["{"name":"data1.1","comp...1.2","value":"data1.3"}", "{"name":"data1.6","comp...1.2","value":"data1.3"}"]
u have to include library for function from JSON.stringify from
https://github.com/douglascrockford/JSON-js/blob/master/json2.js
hope this helps

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