Hello I am generating the following array as result from the search:
[{"id":"292","clientname":"John Mick"},{"id":"293","clientname":"John Tom"}]
this is what it is returned from MySQL Query, but in my Twitter typeahead configuration nothing is showing. Instead of to show 2 results.
Here is my typeahead code:
<script type="text/javascript">
$(function() {
// Instantiate the Bloodhound suggestion engine
var curr = {};
var suggestions = new Bloodhound({
datumTokenizer: function(datum) {
return Bloodhound.tokenizers.whitespace(datum.value);
},
queryTokenizer: Bloodhound.tokenizers.whitespace,
remote: {
url: 'includes/livesearch.php?key=%QUERY',
wildcard: '%QUERY',
filter: function (clientname) {
curr[clientname.clientname] = clientname.id;
// Map the remote source JSON array to a JavaScript object array
return $.map(clientname, function (clientname, index) {
return index === "clientname" ? {
value: clientname
} : null;
});
}
}
});
// Initialize the Bloodhound suggestion engine
suggestions.initialize();
// Instantiate the Typeahead UI
$(".typeahead").typeahead({
hint: true,
minLength: 1
}, {
limit: 7,
displayKey: 'value',
source: suggestions.ttAdapter(),
})
.on("typeahead:selected", function (e, datum) {
$("form [name=clientid]").val(curr[datum.value]); // set value here
curr = {};
var value = document.getElementById("clientid").value;
if (value == 292) {
$("#alltask").hide();
$("#singletask").show();
} else {
$("#singletask").hide();
$("#alltask").show();
}
});
})
</script>
Any help to resolve this difficult situation is welcome. Thank you!
I'm working on the Methods 2 chapter of MeteorTips' Second tutorial, which is basically just building a todo application with several lists.
I moved my code for adding tasks to a list into a method, and decided to try adding some validations to the tasks so that it cannot be blank and it cannot be less than 3 characters. I have the validation working, but my code is returning a Match failed error when running check(currentList, String). I can see that it is not fetching the list's ID, and stroing undefined in the variable.
My question is, how do I fix it?
Code in Question
HTML Template
<template name="addTodo">
<form class="add-todo">
Create a task
<input type="text" placeholder="Type a task here..." name="todoName" />
</form>
</template>
JavaScript
if (Meteor.isClient){
...
Template.addTodo.events({
'submit form': function (event) {
event.preventDefault();
}
});
...
Template.addTodo.onRendered(function () {
var validator = $('.add-todo').validate({
submitHandler: function (event) {
var todoName = $('[name="todoName"]').val();
var currentList = this._id;
console.log(todoName + " | " + currentList); // Assuming user inputs New Task, this returns New Task | undefined
Meteor.call('createListItem', todoName, currentList, function (error, results) {
if (error) {
validator.showErrors({
todoName: error.reason
});
} else {
$('[name="todoName"]').val('');
}
});
}
});
});
...
}
Meteor.methods({
...
'createListItem': function (todoName, currentList) {
check(todoName, String);
check(currentList, String);
var currentUser = Meteor.userId();
var data = {
name: todoName,
completed: false,
createdAt: new Date(),
createdBy: currentUser,
listId: currentList
}
if(!currentUser){
throw new Meteor.Error("not-logged-in", "You're not logged in.");
}
return Todos.insert(data);
},
});
If you have a Cloud 9 account, you can view the complete code. The server may not always be running the application as I have a free account:
Editor (read-only): https://ide.c9.io/blueknightone/meteor-todos
You need to maintain the reference to the original this, because your context is changing in your submitHandler function. As a result, you could use var self = this; and then access the template's data context via self.data:
Template.addTodo.onRendered(function() {
var self = this;
var validator = $('.add-todo').validate({
submitHandler: function(event) {
var todoName = $('[name="todoName"]').val();
var currentList = self.data._id;
console.log(todoName + " | " + currentList);
Meteor.call('createListItem', todoName, currentList, function(error, results) {
if (error) {
validator.showErrors({
todoName: error.reason
});
} else {
$('[name="todoName"]').val('');
}
});
}
});
});
If you want to use ES6 arrow functions, you could implement the following approach:
Template.addTodo.onRendered(function() {
var validator = $('.add-todo').validate({
submitHandler: (event) => {
var todoName = $('[name="todoName"]').val();
var currentList = this.data._id;
console.log(todoName + " | " + currentList);
Meteor.call('createListItem', todoName, currentList, function(error, results) {
if (error) {
validator.showErrors({
todoName: error.reason
});
} else {
$('[name="todoName"]').val('');
}
});
}
});
});
I am working on an app that uses Select2 (version 3.5.1). The HTML to setup this drop down / autocomplete field looks like this:
<input id="mySelect" class="form-control" type="hidden">
The form-control class in this snippet comes from Bootstrap. I am initializing this field from JavaScript using the following:
function getItemFormat(item) {
var format = '<div>' + item.ItemName + '</div>';
return format;
}
$(function() {
$('#mySelect').select2({
minimumInputLength: 5,
placeholder: 'Search for an item',
allowClear: true,
ajax: {
url: '/api/getItems',
dataType: 'json',
quietMillis: 250,
data: function (term, page) {
return {
query: term
};
},
results: function (data, page) {
return { results: data, id: 'ItemId', text: 'ItemText' };
}
},
formatResult: getItemFormat,
dropdownCssClass: "bigdrop",
escapeMarkup: function (m) { return m; }
});
});
When my select field loads, it successfully renders. Once I type at least the fifth character, it successfully pulls items from the server and lists them as options. However, if I try to select one of them, nothing happens. The drop-down popup stays open. Nothing gets put in the actual field. There are no errors in the JavaScript console. Its like I didn't click anything.
In addition, I noticed that nothing is highlighted when I put my mouse over an item or attempt to navigate the list of options with the arrow keys.
What am I doing wrong?
What is happening:
By default, results of the object you are returning in ajax.results should be an array in this structure [{id:1,text:"a"},{id:2,text:"b"}, ...].
results: function (data, page) {
var array = data.results; //depends on your JSON
return { results: array };
}
In Select2.js it actually states:
* #param options.results a function(remoteData, pageNumber, query) that converts data returned form the remote request to the format expected by Select2.
* The expected format is an object containing the following keys:
* results array of objects that will be used as choices
* more (optional) boolean indicating whether there are more results available
* Example: {results:[{id:1, text:'Red'},{id:2, text:'Blue'}], more:true}
Reading the source code, we can see that ajax.results is called on AJAX success:
success: function (data) {
// TODO - replace query.page with query so users have access to term, page, etc.
// added query as third paramter to keep backwards compatibility
var results = options.results(data, query.page, query);
query.callback(results);
}
So ajax.results is really just a function for you to format your data into the appropriate structure ( e.g. [{id:a,text:"a"},{id:b,text:"b"}, ...]) before the data is passed to query.callback:
callback: this.bind(function (data) {
// ignore a response if the select2 has been closed before it was received
if (!self.opened()) return;
self.opts.populateResults.call(this, results, data.results, {term: term, page: page, context:context});
self.postprocessResults(data, false, false);
if (data.more===true) {
more.detach().appendTo(results).html(self.opts.escapeMarkup(evaluate(self.opts.formatLoadMore, self.opts.element, page+1)));
window.setTimeout(function() { self.loadMoreIfNeeded(); }, 10);
} else {
more.remove();
}
self.positionDropdown();
self.resultsPage = page;
self.context = data.context;
this.opts.element.trigger({ type: "select2-loaded", items: data });
})});
And what query.callback eventually does is to set the logic up properly so that everything works fine when you choose one of the items and trigger .selectChoice.
selectChoice: function (choice) {
var selected = this.container.find(".select2-search-choice-focus");
if (selected.length && choice && choice[0] == selected[0]) {
} else {
if (selected.length) {
this.opts.element.trigger("choice-deselected", selected);
}
selected.removeClass("select2-search-choice-focus");
if (choice && choice.length) {
this.close();
choice.addClass("select2-search-choice-focus");
this.opts.element.trigger("choice-selected", choice);
}
}
}
So if there is some misconfiguration (e.g. results is not in the correct structure) that causes the class .select2-search-choice-focus not to be added to the DOM element before .selectChoice is called, this is what happens:
The drop-down popup stays open. Nothing gets put in the actual field. There are no errors in the JavaScript console. Its like I didn't click anything.
Solutions
There are many solutions to this. One of them is, of course, do some array keys manipulation in ajax.results.
results: function (data, page) {
//data = { results:[{ItemId:1,ItemText:"a"},{ItemId:2,ItemText:"b"}] };
var array = data.results;
var i = 0;
while(i < array.length){
array[i]["id"] = array[i]['ItemId'];
array[i]["text"] = array[i]['ItemText'];
delete array[i]["ItemId"];
delete array[i]["ItemText"];
i++;
}
return { results: array };
}
But you may ask: why must the id be "id" and the text be "text" in the array?
[{id:1,text:"a"},{id:2,text:"b"}]
Can the array be in this structure instead?
[{ItemId:1,ItemText:"a"},{ItemId:2,ItemText:"b"}]
The answer is yes. You just need to overwrite the id and text functions with your own functions.
Here are the original functions for .selecte2 in Select2.js:
id: function (e) { return e == undefined ? null : e.id; },
text: function (e) {
if (e && this.data && this.data.text) {
if ($.isFunction(this.data.text)) {
return this.data.text(e);
} else {
return e[this.data.text];
}
} else {
return e.text;
}
},
To overwrite them, just add your own functions inside the object you are passing to .selecte2:
$('#mySelect').select2({
id: function (item) { return item.ItemId },
text: function (item) { return item.ItemText }
......
});
Updates
What else is happening :
However, the text of the selected item does not appear in the field after the list closes.
This means .selectChoice has been successfully executed. Now the problem lies in .updateSelection. In the source code:
updateSelection: function (data) {
var container=this.selection.find(".select2-chosen"), formatted, cssClass;
this.selection.data("select2-data", data);
container.empty();
if (data !== null) {
formatted=this.opts.formatSelection(data, container, this.opts.escapeMarkup);
}
if (formatted !== undefined) {
container.append(formatted);
}
cssClass=this.opts.formatSelectionCssClass(data, container);
if (cssClass !== undefined) {
container.addClass(cssClass);
}
this.selection.removeClass("select2-default");
if (this.opts.allowClear && this.getPlaceholder() !== undefined) {
this.container.addClass("select2-allowclear");
}
}
From here we can see that, before the corresponding string of text is placed into the input, it would call formatSelection.
formatSelection: function (data, container, escapeMarkup) {
return data ? escapeMarkup(this.text(data)) : undefined;
},
Update: Solution
Previously I thought this.text(data) can be overwritten by having text: funcion(item){ ... } in the parameters, but sadly it doesn't work that way.
Therefore to render the text properly in the field, you should overwrite formatSelection by doing
$('#mySelect').select2({
id: function (item) { return item.ItemId },
formatSelection: function (item) { return item.ItemText }
//......
});
instead of trying to overwrite text (which should supposedly have the same effect but this way of overwriting is not yet supported/implemented in the library)
$('#mySelect').select2({
id: function (item) { return item.ItemId },
text: function (item) { return item.ItemText } //this will not work.
//......
});
The issue you are facing is that select2 wants all your results to have an id property. If they don't you need to initialise with an id function which returns the id from each result.
It will not allow you to select a result unless you satisfy one of these. So in the case of your example :
function getItemFormat(item) {
var format = '<div>' + item.ItemName + '</div>';
return format;
}
$(function() {
$('#mySelect').select2({
minimumInputLength: 5,
placeholder: 'Search for an item',
allowClear: true,
id: function(item) { return item.ItemId; }, /* <-- ADDED FUNCTION */
ajax: {
url: '/api/getItems',
dataType: 'json',
quietMillis: 250,
data: function (term, page) {
return {
query: term
};
},
results: function (data, page) {
return { results: data, id: 'ItemId', text: 'ItemText' };
}
},
formatResult: getItemFormat,
dropdownCssClass: "bigdrop",
escapeMarkup: function (m) { return m; }
});
});
You need to provide an ID that returns from your API like #itsmejodie said.
The other problem is that you have to provide select2 formatResult and formatSelection functions, once you have it loaded from Ajax but you can't put html on that. e.g.:
function format (item) {
return item.name;
}
$(function() {
$('#mySelect').select2({
minimumInputLength: 2,
placeholder: 'Search for an item',
allowClear: true,
ajax: {
url: '/api/getItems',
dataType: 'jsonp',
quietMillis: 250,
data: function (term, page) {
return {
query: term
};
},
results: function (data, page) {
return { results: data };
}
},
formatResult: format,
formatSelection: format
});
});
For version 4 of Select2 use
processResults: function (data) {
instead of
results: function (data) {
I am using a jQuery plugin, jTable. The plugin has the following function to load the table:
$('#PersonTable').jtable('load', { CityId: 2, Name: 'Halil' });
The values in the load function is send as POST data. The plugin also sends two query string parameters (jtStartIndex, jtPageSize) through the URL for paging the table.
An example in the documentation shows a function on how to handle this in ASP.NET MVC but not in Web API Example :
[HttpPost]
public JsonResult StudentListByFiter(string name = "", int cityId = 0, int jtStartIndex = 0, int jtPageSize = 0, string jtSorting = null)
{
try
{
//Get data from database
var studentCount = _repository.StudentRepository.GetStudentCountByFilter(name, cityId);
var students = _repository.StudentRepository.GetStudentsByFilter(name, cityId, jtStartIndex, jtPageSize, jtSorting);
//Return result to jTable
return Json(new { Result = "OK", Records = students, TotalRecordCount = studentCount });
}
catch (Exception ex)
{
return Json(new { Result = "ERROR", Message = ex.Message });
}
}
How my function currently looks: It works fine except that I can't manage to read the POST data (name param):
public dynamic ProductsList(string name = "", int jtStartIndex = 0, int jtPageSize = 0 )
{
try
{
int count = db.Products.Count();
var products = from a in db.Products where a.ProductName.Contains(name) select a;
List<Product> prods = products.OrderBy(x => x.ProductID).ToList();
return (new { Result = "OK", Records = prods, TotalRecordCount = count });
}
catch (Exception ex)
{
return (new { Result = "ERROR", Message = ex.Message });
}
}
My jTable load: (This get called when the user enters text in a input)
$('#ProductTable').jtable('load', {
name: $('#prodFilter').val()
});
I would appreciate any help with how to read both the string parameters in the URL and the POST data in a Web API function.
EDIT:
I used an alternative way to send the data to the API. Instead of sending it in the load function formatted as JSON I used a function for the listAction and sent the data through the URL (See jTable API reference for details):
listAction: function (postData, jtParams) {
return $.Deferred(function ($dfd) {
$.ajax({
url: 'http://localhost:53756/api/Product/ProductsList?jtStartIndex=' + jtParams.jtStartIndex + '&jtPageSize=' + jtParams.jtPageSize + '&name=' + $('#prodFilter').val(),
type: 'POST',
dataType: 'json',
data: postData,
success: function (data) {
$dfd.resolve(data);
},
error: function () {
$dfd.reject();
}
});
});
}
To reload the table based on your filtered results:
$('#ProductTable').jtable('load');
Instead of this:
$('#ProductTable').jtable('load', {
name: $('#prodFilter').val()
});
Try applying the [FromBody] attribute to the name parameter
public dynamic GetProductList([FromBody]string name = "", int jtStartIndex = 0, jtPageSize = 0)
{
...
}
The default binder in Web API will look in the URI for simple types like string, specifying the FromBody attribute will force it to look in the body.
Typeahead works if I give a static array as the source, but when I try to generate the array with function it won't populate its dropdown list.
$("#mix-artist" ).typeahead({
source: function(query, process) {
Mix.searchArtist(query);
},
minLength: 3,
});
The function for the source:
searchArtist: function(query) {
$.get(API_MAIN_URL, {a: "search.artists", q: query},
function(data) {
artists = [];
query = query.toLowerCase();
if (data['aData']) {
for (var i = 0; i <= data['aData'].length; i++) {
if (data['aData'][i] && data['aData'][i]['sName'].toLowerCase().indexOf(query) == 0) {
artists.push(data['aData'][i]['sName']);
}
}
}
console.log(artists);
return artists;
});
}
Sample output of the source function:
["Arcangel", "Arc Angels", "Arcade Fire", "Arctic Monkeys", "Archers of Loaf", "Architecture in Helsinki", "Archie Shepp", "Arcade", "Arch Enemy", "Arcadia", "Archie Eversole"]
What can I do to get typeahead to accept this array?
You need your searchArtist function to take the process callback. Instead of returning the array you should call process(artists).