JQuery :: Optimizing Large Dynamic <select>
May 29, 2009
I'm building on-the-fly <select> lists from JSON data fetched from the server. Some of then include a large number of items (>20,000).
The SQL and HTML parts are working fine. The AJAX script fetches data fairly quickly (around 1 second) and large selects are not a problem once they're built (the browser handles them nicely, even IE). The bottleneck is in the process of picking the JSON data and building the <option> tags. That can take a full minute.
What's the recommended (i.e. fastest) method to generate a large <select> list?
My current approach is this:
// Fetch data (GET method allows me to use browser cache)
$.get(url, get, function(jsonValues, txtStatus){
that.values = jsonValues;
}, "json");
[Code].....
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Mar 16, 2010
I have a website using jQuery that for the most part works fine, but it contains a very large form with a lot of fields. I have an option to save the settings from the form and to load and retrieve them from the server. The problem I'm running into is that the loading settings involves changing so much in the DOM (the form is huge and contains a lot of fields) that it seems to be freezing up on some browsers or timing out. I can't reproduce this on my computer (although it does take awhile to finish processing) but I've gotten enough reports of the problem that I'm looking for some advice as to how I can speed it up some.
The site is [URL] I've tried to speed it up by caching a good chunk of the selectors I'm interacting with and I'm using IDs to access the fields in most circumstances. But I'm not sure what else I can do to really optimize the loading. how I can go about improving on the load speed?
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Jul 28, 2010
I am working on a list which displays a large number of contacts (400 to 500 for a typical user). Currently, I am using Dojo (customized widgit) which is created 400 times (once for each contact).This of course is resulting in alot of rendering delay. What is the best approach to display large lists in HTML/javascript? Each list item needs to have an image.
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Mar 27, 2011
I've been told that jQuery can do this.
Simple form which includes a drop down list of users obtained from a database which is displayed using a form select entry with options for each entry. problem is, the list can be quite long, upwards of several hundred.
In PHP, I added a filter box (text box) which the visitor can enter in a substring that is then used to obtain and display only matching entries. Works great, but it needs to reload the page to do its thing.
I've been told that jQuery can be used to do the same thing without having to reload the whole page.
The filter box would be used to call an existing PHP script which obtains the names based on the filtered string. I can change this script to output the data in any format necessary including raw format to full option formatted strings.
how to set this up so that it gets called and replaces the current option content.
Attachments
select01.png
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May 18, 2003
i have the following javascript code:
<!-- hide from browsers that dont support js
if(document.images)
{
about_over = new Image
about_over.src = "images/btn_about_r.gif"
about_out = new Image
about_out.src = "images/btn_about.gif"
success_over = new Image
success_over.src = "images/btn_success_r.gif"
success_out = new Image
success_out.src = "images/btn_success.gif"
}
// -->
and i am using it from within the html code in a standard way:
<a href="about.php" onMouseOver="document.about.src='images/btn_about_r.gif'" onMouseOut="document.about.src='images/btn_about.gif'"><img src="images/btn_about.gif" name="about" width="56" height="23" alt=""></a></td>
question: i don't know much about javascript. i know that the script above preloads the images but i don't understand why the images reference names ( "about_over", "about_out", etc) do not get utilized within html code. it seems to me that they should be used.
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Aug 16, 2010
I've written a function that "condenses" a string if it is too long.
function shortenMsg(msg,maxLen){
if (msg.length > maxLen){
var over = msg.length - maxLen, // amount that needs to be trimmed
[Code]....
Each of the methods 1-3 is the amount that that specific method can trim from the string. I'd like to be able to trim as little as possible.
For example, if the string needs 5 characters to be trimmed, and method1 can trim 8 characters, but method3 can trim 6, then method3 should be used. If none of the methods can individually trim the string enough, then I'd like the optimal combination of the methods that will get the job done.
I can't figure out what sort of code structure I need for this (besides a ton of if/else statements). Maybe an array that contains each of the methods, arranged in increasing order....?
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Jun 30, 2009
I've been beating my head against a wall for a few days trying to get this working. I'm trying to create a dynamic menu where a user selects one item and another select list is shown, then another and another (and so on). Here is my JS, it *should* be taking the ID of the div, comparing it to the selected value and then showing another div by settings it's class property to visible:
[Code]...
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Dec 13, 2011
I am using JQuery Mobile . I have populated Select box with dynamic data, The UI shows just one item populated, rest does not get rendered , here's code. The option loop iterates 5 times but the select box just show one item when renderd. Is it Jquery mobile the select box cannot be populated dynamically?
var options ='';
$("#select-choice-1").empty().append(function() {
$.each(data.maps,function(key, value){
options += '<option value="' + i + '">' + value + '</option>';
[Code]....
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Sep 15, 2011
Basically, i have a CSS/jQuery keyboard from NETTUTS; however my problem is trying to select multiple inputs. Everything works as it should, however i want to select the input, store it in hidden field (which input is current), then when i start to type, it can enter the characters into that input field (that is selected). Currently, it just allows me to enter inputs into a single textarea. I want to onfocus, set as "Focusedfield", and when i type it goes into that field.
Here is my JS code to select/store the "focusedField". Triggered by onFocus. to make the textArea i select, be the one i type into.
Code:
Here is the jQuery
The issue is with this first $write variable. I cannot for the life of me, get it to detect the dynamic variable. When i hardcode the inputs name, it works, but when i try something dynamic - it doesn't. Line 2 of that function is where my issue is (i believe).
Code:
I've tried to replace
Code:
With
Code:
And
Code:
As well as plain old JS var "current_form".
I think its just 1 or 2 lines where this issue is.
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Jul 16, 2010
I'm encountering a snag when attempting to dynamically populate multiple dynamic select elements. I have the following object hierarchy Field --> Category --> Expertise which are displayed within a form as select elements, e.g., when 'Field' is changed then the 'Category' is repopulated based on the root index value of 'Field' and then 'Expertise' is repopulated based on the root index value of 'Category'. Below is the code I'm using:
<div class="formRow">
<label class="desc" for="Job_Field">
Field:</label>
[code]....
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Feb 4, 2010
Below is my code which works fine.
I need to be able to select more than one of the options at the same time. The code at the moment will only select one option rather than all my options.
<HTML>
<HEAD>
<title>MDT Role and Application Selection Application - Gen-i</title>
<!-- Example of the multiple selections
Sub RunScript
[Code]....
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Aug 16, 2001
I have a multiline select box populated from a MySQL query. The value for each option is set to the entry's id number; the option text is the entry's name. Each entry has other pertinent options that aren't present in the option itself (yet), such as location, type, author, etc.
What I want to do is this: have input buttons that will automatically prune the list down depending on one of those other "pertinent options". For example, I click on the button that says "View Articles" - the script would automatically remove all items that weren't articles as defined by that option. Then if I clicked on the button that says "View Location One", it would only display items from Location One, also as defined by the option from the query. If it sounds a bit complicated, I can try and explain it better.
I'm a near-total newbie to JavaScript - I'd like to learn, but so far as I can tell, there are no existing scripts like the one I'd like (that are public access). Any assistance would be a huge help, whether it be code, a link, or even a suggestion.
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Jun 20, 2011
I have the below JS code to change up a select box based on what is selected in another select box. IE9 broke this somehow. It still works in other browsers as well as IE8 and IE7.
When you select something in select box A, it properly populates select box B. However when you go back and change select box A again the script stops working completely.
[Code]...
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Dec 10, 2009
I'm trying to customize a script I found. It's about two select boxes, one for continent selection and one for country selection. When user selects a continent from the first select box, the second select box is filled with the list of the proper countries that belong to this continent.You can see that code of the script here:URl...In my page, the continent select box is loaded with a continent-value already selected (the selection depends on a database value) and I want to have the second countries select box, also loaded with the proper countries.I cannot make this happen, unless I change the continent's selection and trigger the onchange event. Can I someway keep the onchange event and also add the ability to have a continent and it's list of countries already loaded?
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Feb 6, 2009
I have a select element that has up to 200 items in a drop down. Each <option> element has a value 1 to 200, ie., <option value="1">text</option>, etc.
Given a list of values, such as 4, 43, 123, 199, how can I use that list to call a function and write "Selected" for those option elements in the drop down menu?
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Jan 11, 2011
creating --Dynamic dependent cascading select using Ajax.It should not use asp .net, I need to add the code in a text field to generate this kind of cascading customized field.eg. initially we need to populate a select list from database. Then, on selecting an option the next select list needs to get populated with corresponding values, then again on selecting..the third list needs to get populated --this should happen dynamically(with no page refresh).
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Mar 21, 2005
I have a form with a number of <select> fields, some of which require additional fields to be displayed/enabled depending on which <option> is chosen. For example, in the following code, I'd like a <textarea> field to be displayed if users choose the 'Other' option:
<label for="venue_type"><p>What type of venue do you require?</p></label>
<select name="venue_type" id="venue_type">
<option value="null">--Please choose--</option>
<option value="Meeting/Training/Seminar room">Meeting / training / seminar room</option>
<option value="Computer Suite">Computer Suite</option>
<option value="Examination room">Examination room</option>
<option value="Lecture theatre / auditorium">Lecture theatre / auditorium</option>
<option value="Other">Other type of venue</option>
</select>
I'm guessing that it's possible to do this using onchange, but am not too great with Javascript .
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Jan 28, 2002
Question: How hard is the following to do in javascript and does anyone have a good example of this in use (aka how do you do it? )
4 drop down boxes all on one page. I have 4 items in the list of the first drop down box.
Red
Blue
Green
Orange
When I select one, I want the choice to be taken out of the list for the second drop down box. So if I select Blue in Drop Down #1, Drop Down #2 now has the option of
Red
Green
Orange
If I select Red from the list the Drop Down #3 now has
Green
Orange
Then if i select Orange, the last drop down has only one value and that is Green.
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Jan 14, 2010
I have noticed a few requests lately on the forum where there is a request for a dynamic dropdown list (<select...> tag) that would display one set of options if one condition is met, but a different set of options if a different condition is chosen. This is my attempt to solve this problem for other users. The following code is a template to show one way of how this question could be resolved.
[Code]...
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Feb 22, 2010
I have a form on which two separate drop down values need to change based on which option the user selects at the top of the form ("dbt" refers to the remote database the results are pulled from);I have to stick to the names/ids otherwise the form will return an error.I've found examples that dynamically change ONE select list, but not two.
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Aug 12, 2005
I'm trying to write a script with two standard drop down boxes. One
contains days one contains the month. I want to update the options in
the days box everytime the month is changed... i.e select August, and
days are filled up to 31, select September and only 30. The part where
I am having difficulty is that after the onChange event has triggered
and I have checked what the new month is, filling the box with relevant
values is tricky. Code:
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Jul 20, 2005
For some reason my change() function is only called when the page loads. I'd
much rather it gets called when the select changes.
Here's the code:
window.onload = init;
function init() {
var new_select = new Selector('tdata','myselect','myid');
var new_select_list = new DataSource("some_list");
new_select_list.addItem(1,"One");
new_select_list.addItem(2,"Two");
new_select_list.addItem(3,"Three");
new_select_list.addItem(4,"Four");
new_select_list.addItem(5,"Five");
new_select.setDataSource(new_select_list);
new_select.formInput("form","input");
}
Selector = function(container_id,name,id) {
var container = document.getElementById(container_id);
this.node = document.createElement("select");
//this.node = new Select();
container.appendChild(this.node);
this.node.name = name;
this.node.id = id;
}
Selector.prototype.setDataSource = function(ds) {
this.dataSource = ds;
for(var i = 0; i < ds.items.length; i++) {
if(ds.items[i] != undefined) {
var option = new Option(ds.items[i],i,false,false);
this.node.options[this.node.options.length] = option;
}
}
}
Selector.prototype.formInput = function(form,element) {
var myform = document.getElementById(form);
this.input = document.createElement("input");
this.input.name = element;
//this.input.type = "hidden";
myform.insertBefore(this.input,myform.firstChild);
this.node.onchange = change(this);
}
function change(selector) {
alert("hello");
selector.input.value = selector.node.value;
}
DataSource = function(name) {
this.name = name;
this.items = new Array();
}
DataSource.prototype.addItem = function(id,item) {
this.items[id] = item;
}
and the html:
<html>
<head>
<script defer src="/javascript/selectors.js"
type="text/javascript"></script>
</head>
<body>
<form id=form>
<table border=1>
<tr>
<td>
Select:
</td>
<td id=tdata>
</td>
</tr>
</table>
</form>
</body>
</html>
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Dec 3, 2010
the unobtrusive dynamic select boxes are working great.I just wonder if its possible make this script into 2 dynamic select boxes.Like make this script work with 2 dynamic selex boxed, I did try to enter a 3rd ID but dident get it to work.
PHP Code:
/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Bobby van der Sluis | http://www.bobbyvandersluis.com/ */[coe].....
if its any other javascripts out thats allready made and can do it?Right now the 3rd select box works like it isent dynamic.
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Oct 20, 2009
I'm a complete rooking at javascript (and haven't looked at php in months), but am wondering if its possible to do the following with javascript. I have a listing of 10 to 16 teams. I'd like to be able to list the teams in a drop down select box. And when the user selects a team, that teams listing of players is than shown below. The user should than be able to toggle through the listing to review each time.
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Jun 16, 2011
I've seen a variety of implementations around that enable selecting all or no checkboxes by using a checkbox to toggle that choice. However, I'm trying to find a way like this: I have two text links on my page: Select All, and Select None. How can I get those links to call a jquery function to select all or select no checkboxes in my form? As a little food for thought:
<head>
$(function() {
//function for selecting all or none...is there a way to make a single function that passes in a parameter to differentiate between selecting all or selecting none, or do I need a separate function for both?[code]....
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Jul 31, 2009
I'm using ajax to update options in several select forms.Its basically, like in most automotive applications, there is a drop down for brand...once selected, it will populate another select form with the "makes" of that brand. Once a make is selected.. it returns the models of that make... and ect...The program works fine for one selection. When one brand is selected, a second select box is populated with the correct makes of cars that brand produces, however, if the brand is changed, the select box with the makes of the cars is populated by the original query..twice... and then the second query. Looking for help on whats the best way to clear both the results array; i was using this...
autobrandsf.length = 0;
and also clear out the select box, which is what the removeAllOptions() function is for. As it stands, if i use the removeAllOptions(), the makes are never populated.Here is my code, broken down the best i could, in order of process.. ish.A select form that shows the brands is displayed, once a choice is made, it passes the value of the choice into this function, which will query the database
// this is the function that is called once a brand is selected:
// h = the brand passed..
function carBrandCheck(h){[code]....
This is where, the query is returned, each row is split into an individual array, and then the second element of those individual arrays are put into yet again another array.The elements of that array are then compared against eachother to make sure there are no duplicates, storing the non-duplicates into a new array. The final array is then passed into a select form, for the makes of the selected brand.
// the ajax handler:
function handleWorkResponse(){
if(xmlHttp.readyState == 4){[code]......
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