Disable select list options once chosen another select list

Question

1.00/5 (1 vote)

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I have two selected list
Branch and Warehouse
if I choose value of one of them the other should be disabled
for example if I choose a value from Branch then Warehouse should be disabled and opposite is right.

What I have tried:

Razor

<div class="form-group">  
        <label asp-for="Input.Branch"></label>  
        <select asp-for="Input.Branch" id="branch" class="form-control">  
            <option value="">--Select Branch--</option>  
            @foreach (var item in Model.BranchesList)  
            {  
                <option value="@item.BranchId.ToString()">@item.BranchName</option>  
            }  
        </select>  

        <span asp-validation-for="Input.Branch" class="text-danger"></span>  
    </div>  

    <div class="form-group">  
        <label asp-for="Input.Warehouse"></label>  
        <select asp-for="Input.Warehouse" id="warehouse" class="form-control">  
            <option value="">--Select Branch--</option>  
            @foreach (var item in Model.WarehousesList)  
            {  
                <option value="@item.WareHouseId.ToString()">@item.Name</option>  
            }  
        </select>  
        <span asp-validation-for="Input.Warehouse" class="text-danger"></span>  
    </div>  
    <button type="submit" class="btn btn-primary">Register</button>  
</form>

JavaScript :

JavaScript

 $(document).ready(function () {  
    $("#branch").change(function () {  

        if ($(this).val() == "branch") {  

            $("#warehouse").attr('disabled', 'disabled');  
        }  
        else {  
            $("#warehouse").removeAttr('disabled');  
        }  
    });  
});

Posted 10-Mar-21 2:34am

WarehouseMS

Updated 10-Mar-21 3:34am

Richard Deeming

v2

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Richard Deeming · Accepted Answer · 2021-03-10T03:34:00

Try something like this:

JavaScript

$(function(){
    const branchChanged = function(){
        let branch = $("#branch").val();
        $("#warehouse").prop("disabled", branch !== "");
    };
    
    const warehouseChanged = function(){
        let warehouse = $("#warehouse").val();
        $("#branch").prop("disabled", warehouse !== "");
    });
    
    // Update the lists when a value is selected:
    $("#branch").change(branchChanged);
    $("#warehouse").change(warehouseChanged);
    
    // Handle the initial value, if any:
    branchChanged();
    warehouseChanged();
});

NB: Pay attention to the documentation:

.ready() | jQuery API Documentation[^]:

jQuery offers several ways to attach a function that will run when the DOM is ready. All of the following syntaxes are equivalent:

$( handler )
$( document ).ready( handler )
$( "document" ).ready( handler )
$( "img" ).ready( handler )
$().ready( handler )

As of jQuery 3.0, only the first syntax is recommended; the other syntaxes still work but are deprecated.