How to get a Blank value in DropDownList in Jquery?

Question

0.00/5 (No votes)

See more:

Hello Team,

I have the code as follows in jQuery.

HTML

<select id="batchIDSelect" class="combo100">
    <option>Select </option>
</select>

JavaScript

function GetDisplayBatchID() {
    debugger;
    $.ajax({
        url: 'QCAllocation.aspx/GetDisplayBatchID',
        type: 'POST',
        contentType: 'application/json; charset=utf-8',
        dataType: "json",
        success: function (result) {
            debugger;
            if (result.d != '') {
                if (result.d != '' && result.d != null) {
                    DisplayBatchIDList = JSON.parse(result.d);
                    var drawRow = function (batchID) {
                        var dropdown = document.getElementById('batchIDSelect');
                        for (var i = 0; i < batchID.length; i++) {
                            var opt = document.createElement('option');
                            opt.innerHTML = batchID[i].BatchId;
                            dropdown.appendChild(opt);
                        }
                    }

                    drawRow(DisplayBatchIDList);
                    manageOverlay(false);
                }
            }

        },
        error: function (error) {
            manageOverlay(false);
            alert(error.responseText);
        },
        async: false
    })
};

I have call GetDisplayBatchID() on page load. In This,I am getting "Select" value by default in DropDownList.I want to keep blank DropDownList when page load.

How it possible?
I think we need to modify the For Loop, will you show me how to find it ?
Please guide Me.

Thanks
Harshal

[Edit member="Tadit"]
Corrected formatting and grammatical issues.
Added pre tags.
[/Edit]

Posted 2-Apr-14 22:02pm

R Harshal

Updated 2-Apr-14 22:08pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v3

Add a Solution

Comments

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Apr-14 4:10am

Do you want to bind data and select the blank value at top or you don't want to bind anything, but show only a blank?

R Harshal 3-Apr-14 4:32am

Thanks for you reply.
i want to bind the data but at top it should be blank.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Apr-14 4:49am

See my answer. :)

R Harshal 3-Apr-14 4:31am

Thanks for you reply.
i want to bind the data but at top it should be blank.

Sanjay K. Gupta 3-Apr-14 4:48am

You can insert a blank item at position 0

R Harshal 3-Apr-14 4:53am

But how it is possible.
Please guide me .
Thanks
harshal

R Harshal 3-Apr-14 4:55am

Is it like this.
for (var i = 0; i < batchID.length; i++) {
var opt = document.createElement('');
opt = document.createElement('option');
}

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2014-04-02T22:49:00

Solution 1

Try like below...

JavaScript

var dropdown = document.getElementById('batchIDSelect');

var opt = document.createElement('option');
opt.innerHTML = ""
dropdown.appendChild(opt);

for (var i = 0; i < batchID.length; i++) {
    var opt = document.createElement('option');
    opt.innerHTML = batchID[i].BatchId;
    dropdown.appendChild(opt);
}

$("#batchIDSelect option[value='']").attr('selected', true);

Let me know, if it works or not.

Posted 2-Apr-14 22:49pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

R Harshal 3-Apr-14 5:11am

Thank you So Much MR. Tadit
Its working ..
Thank you so much once again.
Harshal.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Apr-14 6:15am

My pleasure. :)

Sanjay K. Gupta · Accepted Answer · 2014-04-02T22:51:00