jQuery-在按钮上单击触发选择选项

Question

Guys i want to ask how can i make a function in jQuery when i click a button to trigger a select of an option in a select menu.

Here is my HTML code:

<select id="target_menu" name="sort_by">
    <option selected="selected" id="position" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=position">Позиция</option>
    <option id="name" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=name">Име</option>
    <option id="price" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=price">Цена</option>
    <option id="color" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=color">Color</option>
    <option id="created_at" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=created_at">Дата</option>
</select>

The option which i want to be triggered as selected is created_at .

Here is the code of the button that i want when it is clicked to select option with id created_at of select menu with id target_menu :

<button onclick="triggerChange()" class="FirstFilter">
    Click me!
</button>

When i click on the button -> Click Me! i want jQuery to force/trigger a selection of option with id created_at at select menu with id target_menu .

How my function triggerChange() must look like ?

So guys, how can i make it?

Answer 1

Try this function:

 function triggerChange(){
        $("#target_menu").val($("#target_menu #created_at" ).val());
        $('#target_menu').trigger('change');
   }

Answer 2

There are few ways of doing it. One is below. A piece of advise is that do not use inline event handlers!

 $("button").on("click", function() { $("#target_menu option").filter(function(opt, el) { return el.id === 'created_at' && $(el) }).prop("selected", true); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <select id="target_menu" name="sort_by"> <option selected="selected" id="position" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=position">Позиция</option> <option id="name" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=name">Име</option> <option id="price" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=price">Цена</option> <option id="color" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=color">Color</option> <option id="created_at" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=created_at">Дата</option> </select> <button class="FirstFilter"> Click me! </button> 

Answer 3

 function triggerChange() { $("#target_menu").val($("#created_at").val()); } 

 <script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script> <select id="target_menu" name="sort_by"> <option selected="selected" id="position" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=position">Позиция</option> <option id="name" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=name">Име</option> <option id="price" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=price">Цена</option> <option id="color" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=color">Color</option> <option id="created_at" value="http://cosmeo.superweb.bg/index.php/priceslider/slider/view/?dir=asc&amp;id=35&amp;max=424&amp;min=0&amp;order=created_at">Дата</option> </select> <button onclick="triggerChange()" class="FirstFilter"> Click me! </button> 

Here is an answer to your question.

function triggerChange()
{
  $("#target_menu").val("created_at");
}

Answer 4

as you have an id applied to each option you can target that id then use the .prop() method.

$(document).ready(function(){
 $(".firstFilter").click(function(){
    var id = $("#created_at").prop("selected","selected");   
 });
});

Answer 5

Use this

function triggerChange(){    
$("#target_menu").eq(4).prop("selected","selected");     
}

Answer 6

I made this fiddle for you

Fiddle

First step is to get value from element with id created_at :

var wantedValue= $('#created_at').attr('value');

And next, you need to set selected value for your select element:

$('#target_menu').val(wantedValue).trigger('change');  // need to call .trigger('change') here
// you can also call .trigger() - without 'change' keyword

Explanation about why you need to trigger .change HERE

For select boxes, checkboxes, and radio buttons, the event is fired immediately when the user makes a selection with the mouse, but for the other element types the event is deferred until the element loses focus.

Update ( thanks LShetty )

$('.FirstFilter').click(function(){
       $("#position").removeAttr("selected");
       $("#created_at").attr('selected','selected');
    });