Show hided ASP image control using java script

Question

0.00/5 (No votes)

See more:

How to hide asp image control using java script
. I tried following code but its not working. image is not visible when on change function is called.

javascript is at client side if I set visibility property of image control to false then can i make it visible through javascript?

What I have tried:

image control code:

<asp:FileUpload ID="FileUpload2" runat="server" onchange="previewFile()" class="fa fa-camera" style="opacity:1;max-width:15px; max-height:11px; margin-top:4px"/> <%--onServerClick="postimagescrap_Click"--%>

javascript:

<script type="text/javascript">
function previewFile() {
var preview = document.querySelector('#<%=Image4.ClientID %>');
var file = document.querySelector('#<%=FileUpload2.ClientID %>').files[0];

document.getElementById("Image4").style.visibility = "visible"
var reader = new FileReader();

reader.onloadend = function () {
preview.src = reader.result;
}

if (file) {
reader.readAsDataURL(file);
} else {
preview.src = "";
}
}
</script>

Posted 27-Aug-16 9:09am

Kishor-KW

Updated 27-Aug-16 18:12pm

v2

Add a Solution

Comments

ZurdoDev 27-Aug-16 21:32pm

Debug your code. This is so simple and fast for you to fix on your own.

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)

Karthik_Mahalingam · Answer 1 · 2016-08-27T18:12:00

If you try to hide the Image asImage1.Visible = true;
in the server, the Image element will be completely removed from the DOM[^]. and you wont be able to control the visibility in javascript( client side).

try this, in c# to hide the element

C#

Image1.Style.Add("display","none");

now the visibility functionality will work as mentioned in the Solution 1

Note: display:none removes the element from the place, allowing other elements to fill in that place where as

visibility:hidden leaves the element in the declared place of the page such that it will still occupies the space

P_Z · Answer 2 · 2016-08-27T10:54:00

HTML DOM Style visibility Property[^] where element will still occupy space when invisible

JavaScript

document.getElementById("Image4").style.visibility = "visible";
document.getElementById("Image4").style.visibility = "hidden";

HTML DOM Style display Property[^] where element will not occupy space when hidden