How to call jJavascript function from code behind on button click in asp net C#?

Question

Here is my Javascript function:

<script type="text/javascript">

    function SelectionTextBox()
    {

            document.getElementById("TextBox1").select();

    }

</script>

Here I call the function on the button:

ScriptManager.RegisterClientScriptBlock(this, GetType(), "t ", "SelectionTextBox();", true);

I want to select text in my TextBox1 on button click but it does not work.

Are those controls inside another user control or a master page? — hardkoded, Aug 02 '17 at 11:16

Husni Salax · Answer 1 · 2017-08-02T10:43:38.707

3

var selectButton = document.getElementById("mySelectBtn");
var textBox = document.getElementById("myTextBox");
selectButton.addEventListener('click', SelectionTextBox = function(){

textBox.focus();
textBox.select();

});

<input type='button' id='mySelectBtn' value='Select'/>
<input type='text' id='myTextBox' value='testString'/>

Try use this code for handling Javascript function by Code behind (C#):

Page.ClientScript.RegisterStartupScript(this.GetType(),"CallMyFunction","SelectionTextBox();",true);

Instead:

ScriptManager.RegisterClientScriptBlock(this, GetType(), "t ", "SelectionTextBox();", true);

JavaScript should be:

var input = document.getElementById('myTextInput');

input.focus();
input.select();

edited Aug 02 '17 at 10:43

answered Aug 01 '17 at 21:15

Husni Salax

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@DemenyiNorbert I've edited my solution pls, check it.. you should use focus() function – Husni Salax Aug 01 '17 at 21:30
@DemenyiNorbert Try this: https://stackoverflow.com/questions/18931936/call-javascript-function-from-c-sharp – Husni Salax Aug 02 '17 at 09:29
Sorry but I tried this before I posted my question. I can`t realize what is the problem. I tried the alert() method which is worked with button but the selection does not work. – Demenyi Norbert Aug 02 '17 at 10:20
@DemenyiNorbert Here is an example which works this method:https://jsfiddle.net/5mad9dpr/ so, I've also edited my solution above – Husni Salax Aug 02 '17 at 10:33
This works fine but the problem when I use onclick="Button1_Click" can`t call C# codes, . Therfore I would like to use – Demenyi Norbert Aug 02 '17 at 19:55

score 0 · Answer 2 · answered Aug 01 '17 at 21:22

You are getting that because your script is being executed before your controls are rendered. Just use RegisterStartupScript and it will work.

RegisterStartupScript will write your script just before closing the form tag, so you'll be safe there.

ScriptManager.RegisterStartupScript(this, GetType(), "t ", "SelectionTextBox();", true);

How to call jJavascript function from code behind on button click in asp net C#?

2 Answers2