Retrieve data table cell values to select option box - javascript

I am trying to retrieve data table cell values to input and select option boxes. The values are displaying in the input box but it fails to display in option select box.
$("#txt_UserName").val(table.cell('.row-modified', 3).data());
$("#dd_Country").select2(“val”, table.cell('.row-modified', 2).data());


Selects don't have value properties. You need to find the matching option element underneath the select and set its selected property (while ensuring all other options do not have selected set).

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I have two combo boxes in a form. The 1st combo box: type of position hiring while the 2nd combo box: location. The values of two combo boxes are dynamically populated from mysql
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I've solved this before. I did this in an MVC C# application, but the idea would still work here.
When you are building your HTML, create the name-value pairs for the combo boxes with the Name (in one of your stated cases) as being 'Linux Admin'. In the value for that, put all the locations in as a tab-delimited string.
In the javascript, when the first combo box changes, have the script read the values from the first combobox selector and split those values and put them in the next combo box as the names.
Here is a general idea that I used for a set of select boxes to allow for the selection of a Make, and then the next select box be populated with the available models.
<select>
<option value="Escape,Expedition,Explorer,F150,F350SD,Focus,Fusion,Mustang,T250 Vans">Ford</option>
<option value="Acadia,Envoy XL,Sierra 1500,Sierra 2500 Clsc,Terrain,Yukon">GMC</option>
</select>

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I am getting values from database into a drop down and I have to select one of the options from those.But when i am trying to select any option, the last value of that drop down list is getting selected automatically. i am using Angular js to bind the UI with database.
before selection : I was trying to select the second path from the drop down but the third path is getting selected automatically.
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I have a select element in HTML. I save just selected value in DB. When I want to edit this element in users side , I need to show value that selected before. I see this link. but in this link user himself determines default value,while I want to have an editable select element.
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A "drop down box" is a combo box. Case you're actually referring to a list box:
Get the selected indices using:
var a = this.getField("listbox").currentValueIndices;
Retrieve the value of an index by calling:
this.getField("listbox").getItemAt(index, false);
Set the value of a textfield:
this.getField("textField").value = "new value".

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