Develop Reference

restrict the user from typing a new name and allow only to select from existing list

I'm working on autocomplete textbox feature of angularjs. I want the user only to select name from the existing autocomplete list instead of typing a new name. Eg.,When user types 'Al' autocomplete list shows the matching list and user can select one name from the existing list instead of typing a new name.How to restrict user from submitting a new name which is not present in the existing list.
Demo : http://plnkr.co/edit/AdmtP1b6K9kQorMHmt7t?p=preview
Code Sample:
$scope.countryList = ["Afghanistan","Albania","Algeria","Andorra","Angola","Anguilla","Antigua & Barbuda","Argentina","Armenia","Aruba","Australia","Austria","Azerbaijan","Bahamas","Bahrain","Bangladesh","Barbados","Belarus","Belgium","Belize","Benin","Bermuda","Bhutan","Bolivia","Bosnia & Herzegovina","Botswana","Brazil","British Virgin Islands","Brunei"];
$scope.validateField = function(){
alert("Clicked on submit , validte field");
}
$scope.complete=function(string){
var output=[];
angular.forEach($scope.countryList,function(country){
if(country.toLowerCase().indexOf(string.toLowerCase())>=0){
output.push(country);
}
});
$scope.filterCountry=output;
}
$scope.fillTextbox=function(string){
$scope.country=string;
$scope.filterCountry=null;
}
Any inputs would be helpful.

You can disable submit button and also highlight the border of the input field red, telling user to select name from drop down list.
First you need to update your complete() function. Use an else if statement that will check if the value is from the list or not, if not then you can implement your desired logic in that else if statement.
This method is flexible and easy to customize your error generation messages. You can show and hide the div that has the error message or you can apply css style on input-field using ng-style or ng-class. Right now I'll show you how to disable or enable button. Here is the updated code snippet:
$scope.complete = function(string) {
var output = [];
angular.forEach($scope.countryList, function(country) {
if (country.toLowerCase().indexOf(string.toLowerCase()) >= 0) {
output.push(country);
$scope.enableDisable = false;
} else if (country.toLowerCase().indexOf(string.toLowerCase()) < 0) {
$scope.enableDisable = true;
}
});
$scope.filterCountry = output;
}
And the In the html section you just need to add ng-disabled attribute and set its value.
<input type="submit" value="submit" ng-disabled="enableDisable" ng-click="validateField()">
So, you can do whatever you want in that else if statement to get the desire error message.

Take a look at this plunkr.
you can check for the validity of input using something like below and monitoring the value using ng-change
$scope.checkInput = function(){
$scope.validInput = $scope.countryList.indexOf($scope.country) > -1;
}

asp.net pass value from javascript to control on a modal popup

Ok, I changed the title because I can't get anywhere with previous approach, so I'm returning to the original question: how can I pass a variable obtained through javascript to a textbox on a modal popup?
I already tried to place a hidden field and even a textbox on the parent page, inside or outside an update panel, but when I click on the linkbutton that opens the modal popup their values are resetted to default.
I already searched and tried many different ways but I can't succeed.
I have a table in a repeater and I need to know the cells selected by the user: start and ending cell of the selection. I accomplish that with this javascript:
$(function () {
var mouse_down = false;
var row, col; // starting row and column
var $tr;
$("#tblPersonale td")
.mousedown(function () {
$("#col_to").html('?');
mouse_down = true;
// clear last selection for a fresh start
$(".highlighted").removeClass("highlighted");
$(this).addClass("highlighted");
$tr = $(this).parent();
row = $tr.parent().find("tr").index($(this).parent());
col = $tr.find("td").index($(this));
$("#row").html(row);
$("#col_fr").html(col - 1);
return false; // prevent text selection
})
.mouseover(function () {
if (mouse_down) {
$("#col_to").html('?');
if ($tr[0] === $(this).parent()[0]) {
var col2 = $(this).parent().find("td").index($(this)); // current column
var col1 = col;
if (col > col2) { col1 = col2; col2 = col; }
$("#col_fr").html(col1-1);
$("#col_to").html(col2 - 1);
// clear all selection to avoid extra cells selected
$(".highlighted").removeClass("highlighted");
// then select cells from col to col2
for (var i = col1; i <= col2; i++) {
if (col1>1){
$tr[0].cells[i].className = "highlighted";}
}
}
}
})
.bind("selectstart", function () {
return false; // prevent text selction in IE
})
$(document)
.mouseup(function () {
mouse_down = false;
});
});
So, when user selects one or more cells I have the start/end value in here:
<span id="col_fr" runat="server" enableviewstate="true">?</span>
<span id="col_to" runat="server" enableviewstate="true">?</span>
Then, when user click a linkbutton I want to use these values to write a text in a textbox on the modal popup that shows. As I said, I can't make it work, anything I tried the result is that the values are lost when popup shows, even if I assign values to global variables before showing the popup.
This is my linkbutton:
<asp:LinkButton runat="server" ID="lnkAddDip" OnClick="lnkAddDip_Click">
The idea behind the old question was to pass the values to the url as parameters and then in the page load use them, but then the table selection doesn't work anymore because at every selection the page refresh because of the url change.
Please anyone, I'm totally lost and not for lack of trying!
OLD QUESTION
asp.net pass a control value as parameter in onclientclick
I found similar questions but no one answer to my problem (or at least, I can't make anything working).
I want to concatenate to the url of the active page some parameters like Home.aspx?col_fr=2 where instead of the fixed "2" I want to pass the value of a hidden field. How can I achive that?
This is my current code:
<asp:hiddenfield runat="server" id="hdnColonnaDa" EnableViewState="true" />
<asp:LinkButton runat="server" ID="lnkAddDip" OnClick="lnkAddDip_Click" OnClientClick="window.location='Home.aspx?col_fr=2';return false;">
Thanks

It just have to move the parameter code o a javascript function like
function getURL(){
var param1 = someField.value/*get field value*/;
var url= "Home.aspx?col_fr="+ param1;
window.location= url;
return false;
}
Html
<asp:LinkButton runat="server" ID="lnkAddDip" OnClick="lnkAddDip_Click" OnClientClick="getURL()">

Don't use UpdatePanel or Modal popup server side. You can use a Thickbox or similar jquery plugin to open the popoup.
Popup can be an inpage div or another page. In case of page, you can easily pass parameters in the url, in case of inpage div, you can get hidden field values.
You can find jquery overlay as Thickbox: just add css and js to your site, the right class on the link and fix the url to open.
Solution using another page
Imagine to use Colorbox (http://www.jacklmoore.com/colorbox/):
PRE
Suppose you have your variable values in some hidden field in your page
TODO
include jquery in your page
Download and include css and js for colorbox
In your page add a html tag with on click event
Add a script section in your page
function openLink()
{
var hiddenValue= $("#col_fr").text(); // or .html()
var urlToOpen = "yourpage.aspx?ids=" + hiddenValue;
$.colorbox({
iframe: true,
width: "75%",
height: "75%",
href: urlToOpen
});
}
Then in Yourpage.aspx you can use url parameter "ids".
Code is not tested!

Finally I did what I want by tuning the original javascript function.
I added 3 hiddenfield on the page and then I add this bit
var hdncol_fr = document.getElementById("hdncol_fr").value;
var hdncol_to = document.getElementById("hdncol_to").value;
var hdnrow = document.getElementById("hdnrow").value;
if (hdncol_fr = '?'){
document.getElementById("hdncol_fr").value = col - 1;
document.getElementById("hdncol_to").value = col2 - 1;
document.getElementById("hdnrow").value = row;
}
This way the hidden fields values are set only when user actively select some cells, when there is a postback event the javascript function returns '?' for the 3 values, so with the added code the hidden field maintains the previous values until user select something else.

Javascript - How to hide a drop down control if it's empty

I have a cascade dropdown on a form. User selects Document Type and most of the document type has Category. However, if a doc type does not have category then I would like to hide the category drop down. Is there a way to see if category dropdown (calculate array or something) and hide category control (by default it always show Select a value even if the drop down does not have any value to select from)
So far I have following and wondering how to evaluate category drop down control based on what user selected in the doc type drop down control.
NWF$(document).ready(function(){
var varDocType= NWF$('#' + jsDocTypes)// gets Doc Type control;
varDocType.change(function(){
if(this.value !== null){
alert(varDocType.val());
var varCategory = NWF$('#' + jsCategory)// gets Category control;
alert(varCategory.val());
if(varCategory == ''){
NWF$('#' + jsCategory).style.visibility = "hidden";
}
}
});
});

Test this:
select:empty {
display: none;
}
Invisible: ||<select></select>--<br>
Visible (whitespace): ||<select> </select>--<br>
Visible (children): ||<select><option>Options!</option></select>--
I do not know what is NWF$ but if you want hide an element by javascript:
TheElement.style.display = "none";

How to get value from dropdown in datatables cell

I've got two datatables and there is a dropdown created in the second one with data from the first. I've created a jsbin here
If you add a couple of instructions to the first table (add any text and then click Add Instruction) - then click on the Load Copied Data button, you will see the dropdown box is populated from the first table.
If I do:
$('#btnTest').on('click', function (e) {
var tsor = $('#tblSORSInstall').dataTable();
var ins = tsor.fnGetData();
alert(ins);
});
It basically gives me the html for the dropdown - how do I get which value they have chosen? I was thinking of having a hidden column and updating that on the onchange of the dropdown, but is there a better way?
Thanks in advance

You may use jQuery.map() to generate an array of selected text/value, like below.
$('#btnTest').on('click', function (e) {
//var tsor = $('#tblSORSInstall').dataTable();
var ins = $('#tblSORSInstall').find("tbody select").map(function() {
return $(this).find(":selected").text() // get selected text
//return $(this).val() // get selected value
}).get()
alert ( JSON.stringify(ins, null, 2) )
});
Here is your JS Bin - updated

Using tsor.fnGetNodes() you can get all table row nodes, then you can loop through those and get the select values.
Final code will look something like
$('#btnTest').on('click', function (e) {
var tsor = $('#tblSORSInstall').dataTable();
var ins = tsor.fnGetData();
var a = tsor.fnGetNodes();
$.each(tsor.fnGetNodes(), function (index, value) {
alert($(value).find('select').val());
});
});

Jquery Chosen plugin. Select multiple of the same option

I'm using the chosen plugin to build multiple select input fields. See an example here: http://harvesthq.github.io/chosen/#multiple-select
The default behavior disables an option if it has already been selected. In the example above, if you were to select "Afghanistan", it would be greyed out in the drop-down menu, thus disallowing you from selecting it a second time.
I need to be able to select the same option more than once. Is there any setting in the plugin or manual override I can add that will allow for this?

I created a version of chosen that allows you to select the same item multiple times, and even sends those multiple entries to the server as POST variables. Here's how you can do it (fairly easily, I think):
(Tip: Use a search function in chosen.jquery.js to find these lines)
Change:
this.is_multiple = this.form_field.multiple;
To:
this.is_multiple = this.form_field.multiple;
this.allows_duplicates = this.options.allow_duplicates;
Change:
classes.push("result-selected");
To:
if (this.allows_duplicates) {
classes.push("active-result");
} else {
classes.push("result-selected");
}
Change:
this.form_field.options[item.options_index].selected = true;
To:
if (this.allows_duplicates && this.form_field.options[item.options_index].selected == true) {
$('<input>').attr({type:'hidden',name:this.form_field.name,value:this.form_field.options[item.options_index].value}).appendTo($(this.form_field).parent());
} else {
this.form_field.options[item.options_index].selected = true;
}
Then, when calling chosen(), make sure to include the allows_duplicates option:
$("mySelect").chosen({allow_duplicates: true})

For a workaround, use the below code on each selection (in select event) or while popup opened:
$(".chosen-results .result-selected").addClass("active-result").removeClass("result-selected");
The above code removes the result-selected class and added the active-result class on the li items. So each selected item is considered as the active result, now you can select that item again.

#adam's Answer is working very well but doesn't cover the situation that someone wants to delete some options.
So to have this functionality, alongside with Adam's tweaks you need to add this code too at:
Chosen.prototype.result_deselect = function (pos) {
var result_data;
result_data = this.results_data[pos];
// If config duplicates is enabled
if (this.allows_duplicates) {
//find fields name
var $nameField = $(this.form_field).attr('name');
// search for hidden input with same name and value of the one we are trying to delete
var $duplicateVals = $('input[type="hidden"][name="' + $nameField + '"][value="' + this.form_field.options[result_data.options_index].value + '"]');
//if we find one. we delete it and stop the rest of the function
if ($duplicateVals.length > 0) {
$duplicateVals[0].remove();
return true;
}
}
....