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<select name="category" id="category">
    <option value="">All Category</option>
    <option value="1">Category 1</option>
    <option value="2">Category 2</option>
    <option value="3">Category 3</option>

</select>

How to choose the category with value=""

Conditions for a correct:

if($('#category option:selected')){
    var category_url = "&category="+$('#category').val();    <!-- True -->
}

Condition 2 wrong:

if($('#category option[value=""]')){
    var category_url = "";                              <!-- Error  -->
}

Please help me!!!


I am not sure if I understand your question correctly, but are you looking to do something like this?

if($('#category option:selected')){
     var selValue = $('#category').val();
     var category_url;

     if(selValue)
         category_url = "&category="+$('#category').val();    <!-- True -->
     else
         <!-- error -->
}

You forgot the # on the id selector: if ($("#EventStartTimeMin").val() === "") { // }. HTML select option field is a drop down list of options, user may be allowed to choose one or more option(s) from this list. To get selected option value , we can implement some jQuery codes on select option field. We will also see various operations that can be performed over it with the below given examples. To get value of first option.


if(!$("#category").val())
     //selected valule is ""

$(select). each(function(){ if ($(this+' option:selected'). val() == '') { //this assumes that your empty value is '' $(this). remove(); } }); jQuery Practical exercise Part - I : Exercise-15. Using jQuery remove all the options of a select box and then add one option and select it. Sample solution : HTML Code : <!DOCTYPE html> <html> <head> <script src="https://code.jquery.com/jquery-git.js"></script> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>Remove all the options of a select box and then add one option and select it with jQuery</title> </head> <body> <select


This is a bit old, but you could do:

$('#category').find('option:empty')

It looks like the function in valHooks for setting a <SELECT> value does line that sets .value directly, then the input box starts out with a blank item, The difference is that when using .val(""), I can't get it to set the value to ""  Select elements typically have two values that you want to access. First there's the value to be sent to the server, which is easy: The second is the text value of the select. For example, using the following select box: <option value="2">Mrs</option> If you wanted to get the string "Mr" if the first option was selected (instead of just "1


In fact, if you tell the browser to select nothing, it does the jox :

$("#category option").attr("selected", false); //Unselect each option

By default the browser Will select will show the first option, whatever is the option's value.

Hope this will helps :)

Calling $('#select').empty() should set options length to 0 var ohtml = ''; ohtml += ('<option value="1">1</option>'); ohtml += ('<option Fix IE8 refresh bug (the values get set in the DOM, but the view for the drop-down does not refresh: Ideally, the jQuery empty() function would include code to set the length to 0. When the first element in the collection is a select-multiple (i.e., a select element with the multiple attribute set),.val() returns an array containing the value of each selected option. As of jQuery 3.0, if no options are selected, it returns an empty array; prior to jQuery 3.0, it returns null.


The question is too old. But it can be useful for other people.

$( <selector> ).find('option[value="<required-value>"]').attr('selected','selected')

When the first element in the collection is a select-multiple (i.e., a select element with the multiple attribute set), . val() returns an array containing the value of each selected option. As of jQuery 3.0, if no options are selected, it returns an empty array; prior to jQuery 3.0, it returns null . How to Get the Value of Selected Option in a Select Box Using jQuery. Topic: JavaScript / jQuery Prev|Next. Answer: Use the jQuery :selected Selector. You can use the jQuery :selected selector in combination with the val() method to find the selected option value in a select box or dropdown list.


Check that the value and text of an option are different. 5. var value = $('#​mySelect').val();. 6. var selectedOptionText = $('#mySelect option[value]:selected'​).text  The second one is the text value of the select element. In the example code, we will show how you can get the text value of the select using jQuery. The following select box has some options with values, the text value of the selected option will be retrieved from this select element.


configuration option. The placeholder value will be displayed until a selection is made. For multi-selects, you must not have an empty <option> element: Select2 supports placeholders for all configurations, including AJAX. You will still​  Reset (Clear) DropDownList selection (selected value) using jQuery The following HTML Markup consists of an HTML DropDownList (DropDown) control and a Button. When the Button is clicked, the jQuery click event handler is executed.


While I understand that for a single select, I don't while get why that would be In the case of select elements, it returns null when no option is timmywil added a commit to timmywil/jquery that referenced this issue on Nov 4, 2015. @timmywil · Attributes: return empty array for select-multiple with no values I’m trying to do something similar as this Post, I mean, using JQuery to set a value in a SelectCheckboxMenu Primefaces web component. I’ve researched a lot and get to the following working code: The above code works for a column with no dropdown box.