Save and load background with javascript

Save and load background with javascript - javascript

This is the code I have on my website: you can see a select with a dropdown list that has a few options. When an option is clicked, a background will be loaded with the onchange() event.
<select id="rds" onchange="bg(this[this.selectedIndex].value);">
<option value="0.png">1. Default</option>
<option value="1.png">2. Collage</option>
<option value="2.jpg">3. Darkness</option>
</select>
And here the bg() function:
function bg(num) {
document.body.style.backgroundImage = "url(http://mk7vrlist.altervista.org/backgrounds/" + num + ")";
}
This works perfectly. I have to save the option that an user selected, so every time he opens the webpage, he can see the background he selected.
I was thinking to save a cookie and load it. Since I saw that it's a bit tricky with javascript, I thought I could use jQuery and so I made this:
<select id="rds" onchange="bg(this[this.selectedIndex].value); $.cookie("example", this[this.selectedIndex].value, {expires: 7});">
<option value="0.png">1. Default</option>
<option value="1.png">2. Collage</option>
<option value="2.jpg">3. Darkness</option>
</select>
The cookie is not saving and Mozilla tells me SyntaxError: syntax error. How could I fix this problem?
I've included the jQuery file in this way:
<script type="text/javascript" src="http://mk7vrlist.altervista.org/jquery-1.10.2.min.js"></script>
How can I load the background once I saved the cookie? I have to call the bg() function but I don't know how to do it.

Firstly, don't use on[event] attributes. They're outdated and make maintenance harder. Instead attach your events in JS. Here's a jQuery example, using $.cookie():
<select id="rds">
<option value="0.png">1. Default</option>
<option value="1.png">2. Collage</option>
<option value="2.jpg">3. Darkness</option>
</select>
var setBackground = function(bgImg) {
$.cookie('bgImg', bgImg);
$('body').css('background-image', 'url(http://mk7vrlist.altervista.org/backgrounds/' + bgImg + ')');
}
$(function() {
// on select change
$('#rds').change(function() {
setBackground($(this).val());
});
// on load
setBackground($.cookie('bgImg'));
});

Your syntax error is here:
<select id="rds" onchange="bg(this[this.selectedIndex].value); $.cookie("example", this[this.selectedIndex].value, {expires: 7});">
You should write this:
<select id="rds" onchange="bg(this[this.selectedIndex].value); $.cookie('example', this[this.selectedIndex].value, {expires: 7});">
Note the simple quote around 'example'. On your example, you used double quotes that were interfering with the double quotes of the html attribute.

Your syntax error is because you don't escape the quotes in the onchange event, change it to this:
<select id="rds" onchange="bg(this[this.selectedIndex].value); $.cookie('example', this[this.selectedIndex].value, {expires: 7});">
<option value="0.png">1. Default</option>
<option value="1.png">2. Collage</option>
<option value="2.jpg">3. Darkness</option>
</select>
To load the background use the solution of the other answers :).

Related

Need Help to Scrape a Website [duplicate]

I have a drop-down list with known values. What I'm trying to do is set the drop down list to a particular value that I know exists using jQuery.
Using regular JavaScript, I would do something like:
ddl = document.getElementById("ID of element goes here");
ddl.value = 2; // 2 being the value I want to set it too.
However, I need to do this with jQuery, because I'm using a CSS class for my selector (stupid ASP.NET client ids...).
Here are a few things I've tried:
$("._statusDDL").val(2); // Doesn't find 2 as a value.
$("._statusDDL").children("option").val(2) // Also failed.
How can I do it with jQuery?
Update
So as it turns out, I had it right the first time with:
$("._statusDDL").val(2);
When I put an alert just above it works fine, but when I remove the alert and let it run at full speed, I get the error
Could not set the selected property. Invalid Index
I'm not sure if it's a bug with jQuery or Internet Explorer 6 (I'm guessing Internet Explorer 6), but it's terribly annoying.

jQuery's documentation states:
[jQuery.val] checks, or selects, all the radio buttons, checkboxes, and select options that match the set of values.
This behavior is in jQuery versions 1.2 and above.
You most likely want this:
$("._statusDDL").val('2');
Add .change() to see the option in the dropdown list frontend:
$("._statusDDL").val('2').change();

With hidden field you need to use like this:
$("._statusDDL").val(2);
$("._statusDDL").change();
or
$("._statusDDL").val(2).change();

These solutions seem to assume that each item in your drop down lists has a val() value relating to their position in the drop down list.
Things are a little more complicated if this isn't the case.
To read the selected index of a drop down list, you would use this:
$("#dropDownList").prop("selectedIndex");
To set the selected index of a drop down list, you would use this:
$("#dropDownList").prop("selectedIndex", 1);
Note that the prop() feature requires JQuery v1.6 or later.
Let's see how you would use these two functions.
Supposing you had a drop down list of month names.
<select id="listOfMonths">
<option id="JAN">January</option>
<option id="FEB">February</option>
<option id="MAR">March</option>
</select>
You could add a "Previous Month" and "Next Month" button, which looks at the currently selected drop down list item, and changes it to the previous/next month:
<button id="btnPrevMonth" title="Prev" onclick="btnPrevMonth_Click();return false;" />
<button id="btnNextMonth" title="Next" onclick="btnNextMonth_Click();return false;" />
And here's the JavaScript which these buttons would run:
function btnPrevMonth_Click() {
var selectedIndex = $("#listOfMonths").prop("selectedIndex");
if (selectedIndex > 0) {
$("#listOfMonths").prop("selectedIndex", selectedIndex - 1);
}
}
function btnNextMonth_Click() {
// Note: the JQuery "prop" function requires JQuery v1.6 or later
var selectedIndex = $("#listOfMonths").prop("selectedIndex");
var itemsInDropDownList = $("#listOfMonths option").length;
// If we're not already selecting the last item in the drop down list, then increment the SelectedIndex
if (selectedIndex < (itemsInDropDownList - 1)) {
$("#listOfMonths").prop("selectedIndex", selectedIndex + 1);
}
}
My site is also useful for showing how to populate a drop down list with JSON data:
http://mikesknowledgebase.com/pages/Services/WebServices-Page8.htm

Just an FYI, you don't need to use CSS classes to accomplish this.
You can write the following line of code to get the correct control name on the client:
$("#<%= statusDDL.ClientID %>").val("2");
ASP.NET will render the control ID correctly inside the jQuery.

Just try with
$("._statusDDL").val("2");
and not with
$("._statusDDL").val(2);

After looking at some solutions, this worked for me.
I have one drop-down list with some values and I want to select the same value from another drop-down list... So first I put in a variable the selectIndex of my first drop-down.
var indiceDatos = $('#myidddl')[0].selectedIndex;
Then, I select that index on my second drop-down list.
$('#myidddl2')[0].selectedIndex = indiceDatos;
Note:
I guess this is the shortest, reliable, general and elegant solution.
Because in my case, I'm using selected option's data attribute instead of value attribute.
So if you do not have unique value for each option, above method is the shortest and sweet!!

I know this is a old question and the above solutions works fine except in some cases.
Like
<select id="select_selector">
<option value="1">Item1</option>
<option value="2">Item2</option>
<option value="3">Item3</option>
<option value="4" selected="selected">Item4</option>
<option value="5">Item5</option>
</select>
So Item 4 will show as "Selected" in the browser and now you want to change the value as 3 and show "Item3" as selected instead of Item4.So as per the above solutions,if you use
jQuery("#select_selector").val(3);
You will see that Item 3 as selected in browser.But when you process the data either in php or asp , you will find the selected value as "4".The reason is that , your html will look like this.
<select id="select_selector">
<option value="1">Item1</option>
<option value="2">Item2</option>
<option value="3" selected="selected">Item3</option>
<option value="4" selected="selected">Item4</option>
<option value="5">Item5</option>
</select>
and it gets the last value as "4" in sever side language.
SO MY FINAL SOLUTION ON THIS REGARD
newselectedIndex = 3;
jQuery("#select_selector option:selected").removeAttr("selected");
jQuery("#select_selector option[value='"+newselectedIndex +"']").attr('selected', 'selected');
EDIT: Add single quote around "+newselectedIndex+" so that the same functionality can be used for non-numerical values.
So what I do is actually ,removed the selected attribute and then make the new one as selected.
I would appreciate comments on this from senior programmers like #strager , #y0mbo , #ISIK and others

If we have a dropdown with a title of "Data Classification":
<select title="Data Classification">
<option value="Top Secret">Top Secret</option>
<option value="Secret">Secret</option>
<option value="Confidential">Confidential</option>
</select>
We can get it into a variable:
var dataClsField = $('select[title="Data Classification"]');
Then put into another variable the value we want the dropdown to have:
var myValue = "Top Secret"; // this would have been "2" in your example
Then we can use the field we put into dataClsField, do a find for myValue and make it selected using .prop():
dataClsField.find('option[value="'+ myValue +'"]').prop('selected', 'selected');
Or, you could just use .val(), but your selector of . can only be used if it matches a class on the dropdown, and you should use quotes on the value inside the parenthesis, or just use the variable we set earlier:
dataClsField.val(myValue);

So I changed it so that now it
executes after a 300 miliseconds using
setTimeout. Seems to be working now.
I have run into this many times when loading data from an Ajax call. I too use .NET, and it takes time to get adjusted to the clientId when using the jQuery selector. To correct the problem that you're having and to avoid having to add a setTimeout property, you can simply put "async: false" in the Ajax call, and it will give the DOM enough time to have the objects back that you are adding to the select. A small sample below:
$.ajax({
type: "POST",
url: document.URL + '/PageList',
data: "{}",
async: false,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
var pages = (typeof response.d) == 'string' ? eval('(' + response.d + ')') : response.d;
$('#locPage' + locId).find('option').remove();
$.each(pages, function () {
$('#locPage' + locId).append(
$('<option></option>').val(this.PageId).html(this.Name)
);
});
}
});

I use an extend function to get client ids, like so:
$.extend({
clientID: function(id) {
return $("[id$='" + id + "']");
}
});
Then you can call ASP.NET controls in jQuery like this:
$.clientID("_statusDDL")

Another option is to set the control param ClientID="Static" in .net and then you can access the object in JQuery by the ID you set.

<asp:DropDownList id="MyDropDown" runat="server" />
Use $("select[name$='MyDropDown']").val().

Just a note - I've been using wildcard selectors in jQuery to grab items that are obfuscated by ASP.NET Client IDs - this might help you too:
<asp:DropDownList id="MyDropDown" runat="server" />
$("[id* = 'MyDropDown']").append("<option value='-1'> </option>"); //etc
Note the id* wildcard- this will find your element even if the name is "ctl00$ctl00$ContentPlaceHolder1$ContentPlaceHolder1$MyDropDown"

How are you loading the values into the drop down list or determining which value to select? If you are doing this using Ajax, then the reason you need the delay before the selection occurs could be because the values were not loaded in at the time that the line in question executed. This would also explain why it worked when you put an alert statement on the line before setting the status since the alert action would give enough of a delay for the data to load.
If you are using one of jQuery's Ajax methods, you can specify a callback function and then put $("._statusDDL").val(2); into your callback function.
This would be a more reliable way of handling the issue since you could be sure that the method executed when the data was ready, even if it took longer than 300 ms.

<asp:DropDownList ID="DropUserType" ClientIDMode="Static" runat="server">
<asp:ListItem Value="1" Text="aaa"></asp:ListItem>
<asp:ListItem Value="2" Text="bbb"></asp:ListItem>
</asp:DropDownList>
ClientIDMode="Static"
$('#DropUserType').val('1');

In my case I was able to get it working using the .attr() method.
$("._statusDDL").attr("selected", "");

Pure JS
For modern browsers using CSS selectors is not a problem for pure JS
document.querySelector('._statusDDL').value = 2;
function change() {
document.querySelector('._statusDDL').value = 2;
}
<select class="_statusDDL">
<option value="1" selected>A</option>
<option value="2">B</option>
<option value="3">C</option>
</select>
<button onclick="change()">Change</button>

If we want to find from the option name and then selected options with the jQuery please see below code:-
<div class="control">
<select name="country_id" id="country" class="required-entry" title="Country" data-validate="{'validate-select':true}" aria-required="true">
<option value=""> </option>
<option value="SA">Saudi Arabia</option>
<option value="AF">Afghanistan</option>
<option value="AR">Argentina</option>
<option value="AM">Armenia</option>
<option value="AW">Aruba</option>
<option value="AU">Australia</option>
<option value="AT">Austria</option>
<option value="IS">Iceland</option>
<option value="IN">India</option>
<option value="ID">Indonesia</option>
<option value="IR">Iran</option>
<option value="IQ">Iraq</option>
<option value="IE">Ireland</option>
<option value="IM">Isle of Man</option>
<option value="IL">Israel</option>
<option value="IT">Italy</option>
<option value="JM">Jamaica</option>
<option value="JP">Japan</option>
<option value="JE">Jersey</option>
<option value="JO">Jordan</option>
<option value="AE">United Arab Emirates</option>
<option value="GB">United Kingdom</option>
<option value="US" selected="selected">United States</option>
</select>
</div>
<script type='text/javascript'>
let countryRegion="India";
jQuery("#country option:selected").removeAttr("selected");
let cValue= jQuery("#country option:contains("+countryRegion+")").val();
jQuery("#country option[value='"+cValue +"']").attr('selected', 'selected');
</script>
I hope this will help!

How to close dropdown on onchange event of selector In iOS6?

I am working on hybrid application with worklight.
When tapping on select control, a native dropdown pops out. Now I have bound onchange event on this select so when I choose any option the event gets fired but the dropdown doesn't fadeout until I tap on the done button.
I have used ('select').blur() to overcome and it is working fine for Android but not for iOS6.
I want to fadeout the dropdown with onchange.
Code:
<select id="myID" onchange="myFun()">;
function myFun(){
$('select').blur();
}
or
function myFun(){
$('#myID').blur();
}
What are the possible soultions for it? Thanks.

It seems that in iOS you cannot use .blur() on a select element, the event will be ignored.
Note: in iOS the user is expected to tap the Done button. Why confuse your end-user by introducing unexpected interaction and behavior (= not provided by the OS to begin with). For example, what if the user selected by mistake? Instead of being able to correct on the spot, s/he will be forced to tap again and select again... I recommend leaving it with the default behavior.
Updated example: instead of removing the select from the DOM and re-introducing it, I've found this.
The below works only in iOS6, though, per the question. It doesn't work in iOS7.
HTML
<div id="mySelectDiv">
<select id="mySelect">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
</div>
Selected option: <input type="text" id="selectedOption"/>
JavaScript
function wlCommonInit(){
$("#mySelect").bind('change', changeValue);
}
function changeValue() {
var mySelectedIndex = $("#mySelect option:selected").index();
$("#selectedOption").val($("#mySelect option:selected").text());
if($("#mySelect").is("select")){
var fakeSelect = $("#mySelect").clone();
$("#mySelect").replaceWith(fakeSelect);
$("#mySelect").bind('change', changeValue);
$("#mySelect").prop('selectedIndex', mySelectedIndex);
}
}

While my previous answer will work, only in iOS6, the following works for me in both iOS6 and iOS7 using the iOS7-Select-Element-Auto-Close plug-in by lukewhyte.
Simply place the JS code provided in the plug-in in your project and include it in your index.html,
<script src="js/select.js"></script>
Then:
HTML
<div id="mySelectDiv">
<select id="mySelect">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
</div>
JavaScript
function wlCommonInit(){
$('#mySelect').iOSSelect();
$("#mySelect").bind('change', changeValue);
}
function changeValue() {
$("#selectedOption").val($("#mySelect option:selected").text());
}

Fail to set selected in combobox jquery

i'm loading a combo-box dynamically with jquery, after renderized, this combo have the follow structure
<select id="cboCliente" class="form-control">
<option value="0">Selecione...</option>
<option value="1">Cliente 0</option>
<option value="2">Cliente 1</option>
<option value="3">Cliente 2</option>
</select>
After some validation, i try to set one of this options as "selected", but don't work. This is my code:
$('#cboCliente option[value='+ m.getIdCliente() +']').prop('selected', true);
the method getIdCliente() is working fine, i receive the value "1".
The thing is, the jQuery can't set the selected option, and when a try for the Developer tools of chrome, everything works fine.
Am i doing something wrong?

Use
$("#cboCliente").val(m.getIdCliente());
Working demo: http://jsfiddle.net/GNzSL/

can we cache it first like this?
var selected = '#cboCliente option[value='+ m.getIdCliente() +']';
$(selected).prop('selected', true);

Modify selected property in select option

I'm building a select with several options from my php script using pattemplate.
But no matter what I do, the selected option shows in the dom tree like this:
<select id="academicYear">
<option value="1516">2015-2016</option>
<option value="1415">2014-2015</option>
<option selected="" value="1314">2013-2014</option>
<option value="1213">2012-2013</option>
</select>
Is there any way using dom - javascript - jquery to turn:
<option selected="" value="1314">2013-2014</option>
Into:
<option selected value="1314">2013-2014</option>
?
The reason why I need the change: with selected="" I don't get any selection when my select shows in the dialog window where I present it. When I turn it into just select with Firebug and Chrome debug bar the selection works.
Thans a ton!

You can use the id for faster and safer selector:
$('#academicYear option[value="1314"]').prop('selected', true);
The right html sintaxis is:
<option selected="selected" value="1314">2013-2014</option>

I believe setting the value of select will alter that property correctly for you. Otherwise if you still need to change the selected property...
$('option[value="1314"]').prop('selected', true);

get value of combobox with javascript

i have html code like this:
<select name="xcontract_id" onchange="jf_get_einv_disable(document.MYFORM);fenable(document.MYFORM);jf_best_contract(document.getElementById('xcust_icorcID').value,document.getElementById('xcontract_id').value);jf_check_dlstart_1_3_contr(document.getElementById('xcust_icorcID').value,document.getElementById('xcontract_id').value,document.getElementById('xsim_cnt').value);">
<option selected="">choose
<option value="14030">8N_870MHz_0106
<option value="14031">8N_870MHz_Norma_0106
<option value="48414">AX_AI_nova_akt_DZ_NTBK_24m_0103
.
.
.
</option></select>
and i have js functions declareted like this:
jf_get_einv_disable(frm){
...
//var typzmluvy=frm.xcontract_id.options[frm.xcontract_id.selectedIndex].value;
var typzmluvy=frm.xcontract_id.value;
...}
but when i dont change the default value of combobox (so i have still "choose") the variable is set to "choose" instead of "" or null. The first declaration is commented, because i try the second, but none of them works.
What im doing wrong? Thanks for any reply or help.
Ondro
ps:html doesnt have closing tag, because i copy it from ie developers tools.

Use it like this
<option value="" selected>choose</option>

Use
<option value="0" selected="selected">choose</option>
so you can validate it.

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JavaScript is the programming language of the Web.

Save and load background with javascript - javascript

Related

Need Help to Scrape a Website [duplicate]

How to close dropdown on onchange event of selector In iOS6?

Fail to set selected in combobox jquery

Modify selected property in select option

get value of combobox with javascript

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