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
– hardkoded, Commented Aug 2, 2017 at 11:16

Husni Salax · Accepted Answer · 2017-08-02 10:43:38Z

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 2, 2017 at 10:43

answered Aug 1, 2017 at 21:15

Husni Salax

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5 Comments

Husni Salax Over a year ago

@DemenyiNorbert I've edited my solution pls, check it.. you should use focus() function

Husni Salax Over a year ago

@DemenyiNorbert Try this: stackoverflow.com/questions/18931936/…

Demenyi Norbert Over a year ago

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.

Husni Salax Over a year ago

@DemenyiNorbert Here is an example which works this method:jsfiddle.net/5mad9dpr so, I've also edited my solution above

Demenyi Norbert Over a year ago

This works fine but the problem when I use onclick="Button1_Click" can

t call C# codes,  <input type='button' id='Button1' onclick="Button1_Click" />.  Therfore I would like to use  <asp:Button ID="Button1" instead of <input type='button' but this way can

t call the javascript function.

hardkoded · Accepted Answer · 2017-08-01 21:22:35Z

0

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);

answered Aug 1, 2017 at 21:22

hardkoded

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