Member Avatar for tgreer

I've posted a new article on my site, dealing with how to integrate JavaScript and ASP.NET. It's a "beginner level" article.

http://www.tgreer.com/aspnet_html_03.html

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Good starter from (and the positive remarks from and ). The posts correctly call out the server-vs-client confusion that trips up newcomers; the short inline example from demonstrates the client side but omits a few practical patterns and pitfalls that commonly come up for people like . The notes below focus on reliable, long-lived patterns for integrating ASP.NET WebForms and JavaScript.

Common pattern: run client validation or UI code before a server postback (use the control's client-side hook so the server handler still runs when appropriate):

<asp:Button ID="btnSave" runat="server" Text="Save"
  OnClientClick="if(!validateForm()){return false;}" OnClick="btnSave_Click" />

Referencing server controls from inline script within an .aspx page (avoids guessing generated IDs):

<script type="text/javascript">
  var nameVal = document.getElementById('<%= txtName.ClientID %>').value;
</script>

Emitting scripts from code-behind so they run at the right time (and only once):

string script = "alert('Saved');";
Page.ClientScript.RegisterStartupScript(this.GetType(), "saved", script, true);

When partial postbacks or UpdatePanels are involved, use ScriptManager.RegisterStartupScript instead so the script runs after the async update.

Quick troubleshooting checklist and cautions:

  • Avoid document.write after page load; prefer updating DOM nodes with textContent/innerHTML.
  • Never concatenate raw server strings into JS without encoding/serializing; prefer server-side JSON serialization to produce safe literals.
  • Remember server code executes first and only emits markup/JS — DOM manipulation requires client execution or a postback/AJAX round-trip.
  • ASP.NET control IDs can be made predictable in newer frameworks (ClientIDMode) or mapped into JS variables when external scripts are used.

These concise patterns resolve the common failures mentioned across the thread and give stable, maintainable approaches for mixing ASP.NET and JavaScript.

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Member Avatar for Paladine

Excellent code and guide for a beginner, tgreer.

:)

I've posted a new article on my site, dealing with how to integrate JavaScript and ASP.NET. It's a "beginner level" article.

http://www.tgreer.com/aspnet_html_03.html

Member Avatar for tgreer

Thanks. Most new ASP.NET coders seem to get tripped up on the browser vs. server / client vs. server dichotomy.

Any suggestions for future topics?

Member Avatar for Letscode

Excellent Article..... I Wish I Have Read This A Long Time Back.....

Member Avatar for Letscode

THERE ARE MANY METHODS THAT I SPENT WEEKS BREAKING MY HEAD TO GET IT RIGHT IS EXPLAINED SO CLEARLY IN THIS ARTICLE...

I suggest everyone to read this article before getting into Javascript and .NET

Member Avatar for mariappan.s

hi friends... how can i use javascript codings with asp.net. i need sample code also. any one help me..

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