Generating a Dynamic Label with JavaScript

Currently using Aspnet, I find myself in need of generating an undetermined number of labels for a specific page. A button triggers a function that dynamically creates a label through JavaScript:

<script type="text/javascript">
function create() {
   var newlabel = document.createElement("box1");

           ...

  document.getElementById("MainContent_revenuestreams").appendChild(newlabel);
}
</script>

The issue arises when the newly created label only appears on the webpage for a brief 2-3 seconds before disappearing (likely due to postback eliminating its content).

I am seeking guidance on how to prevent this from happening.

javascriptasp.netlabelpostbackpageload

Answer №1

document.createElement(type) function requires a valid HTML tag name such as div, table, or p.

For your specific case:

var newLabel = document.createElement("label");

You can then assign attributes to this element (such as 'for' which is crucial for labels, id, and name).

Lastly:

newLabel.appendChild(document.createTextNode("This is where the label caption will go"));
document.getElementById("MainContent_revenuestreams").appendChild(newLabel);

Check out these resources for more information:

http://www.w3schools.com/jsref/met_document_createelement.asp

http://www.w3schools.com/jsref/met_document_createtextnode.asp

Remember, using box1 as an argument in document.createElement(type) is not valid.

Answer №2

To prevent the postback of the button, you must ensure that your function returns false:

<asp:Button runat="server" OnClientClick="javascript: create();return false;"/>

It's important to remember that using document.createElement("box1"); will generate a <box1></box1> element, which may not be the desired outcome. Consider changing "box1" to "label" or "span"

Answer №3

Implement OnClientClick to trigger the function addNewlabel

The function addNewlabel is defined as follows:

var NumOfRow++;
var mainDiv=document.getElementById('MainDiv'); 
var newDiv=document.createElement('div'); 
newDiv.setAttribute('id','innerDiv'+NumOfRow); 
var newSpan=document.createElement('span'); 
newSpan.innerHTML="Your Label Name"; 
// append the span
newDiv.appendChild(newSpan); 
mainDiv.appendChild(newDiv);

End of function.

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