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.NET Forum / ASP.NET / General / August 2007executing a server method after page is rendered
Hi all I am calling a method in a Page_Load event that makes use of a value from a text box. Unfortunately the textbox value is only set after a javascript runs and the page is rendered. Therefore the textbox is actually empty when the Page_Load event fires. Is there a way to execute the method after the javascript has run and the page has rendered. I can do it by adding a button and placing the call to the method in its onClick event but this is not acceptable in terms of user interface. It must happen onLoad. Can I maybe "fake" a button click? Thanks in advance John On Aug 27, 9:42 pm, "jphayc...@googlemail.com" <jphayc...@googlemail.com> wrote: > Hi all > [quoted text clipped - 17 lines] > > John John, you can do a button click, but it requires a postback to the server <input type="button" id="bbb" style="display:none" runat="server" onserverclick="..."> in js var btn = document.getElementById("bbb"); btn.click(); I would suggest either to think about Ajax, or change the behavior of the form My understanding says you need following funcationality 1) before page load some javascript executes 2) on page load event some server side method uses value of textbox. you can try in this way. declare html hidden control with runat server side, when javascript executes store value of textbox in hidden field. Use hidden field value in server side method during page load. Bye > On Aug 27, 9:42 pm, "jphayc...@googlemail.com" > <jphayc...@googlemail.com> wrote: [quoted text clipped - 34 lines] > I would suggest either to think about Ajax, or change the behavior of > the form Thank you Mukesh This gives me the same type of problem. I cannot get the value of the hidden field until after the page has completely rendered so i can't refer to it in the page_load event. John On 28 Aug, 10:22, Mukesh Zala <MukeshZ...@discussions.microsoft.com> wrote: > My understanding says you need following funcationality > 1) before page load some javascript executes [quoted text clipped - 4 lines] > Use hidden field value in server side method during page load. > Bye Cheers for the answer Alex I tried this but it didn't work. it couldn't find the serverside method John > you can do a button click, but it requires a postback to the server > [quoted text clipped - 10 lines] > > - Show quoted text - On Aug 27, 10:42 pm, "jphayc...@googlemail.com" <jphayc...@googlemail.com> wrote: > Hi all > [quoted text clipped - 17 lines] > > John As I see you have to do something with value in textbox after it was changed. Try to use OnTextChanged event handler insted of Page_Load: <asp:TextBox ID="TextBox1" runat=server AutoPostBack=true OnTextChanged="TextBox1_TextChanged"></asp:TextBox> protected void TextBox1_TextChanged(object sender, EventArgs e) { //call your method here } Regards, Mykola http://marss.co.ua Thank you Mykola Alas, that still requires user interaction after the page has loaded. I need this to happen without the user clicking a button or changing text. The value of the textbox is populated by a javascript and the OnTextChanged event isn't fired by this action. John > As I see you have to do something with value in textbox after it was > changed. [quoted text clipped - 12 lines] > > - Show quoted text - On 28 , 17:16, "jphayc...@googlemail.com" <jphayc...@googlemail.com> wrote: > Thank you Mykola > [quoted text clipped - 21 lines] > > > - Show quoted text - View page source and find how ASP.Net rendered textbox. It have to be something like this: <input name="TextBox1" type="text" onchange="javascript:setTimeout('__doPostBack(\'TextBox1\',\'\')', 0)" ... Call __doPostBack('TextBox1','') in your javascript after you changed value.. Regards, Mykola http://marss.co.ua Hi Mykola Thank you This worked but it keeps firing repeatedly. Do you know how i can make it postback only once? John View page source and find how ASP.Net rendered textbox. It have to be > something like this: > <input name="TextBox1" type="text" [quoted text clipped - 8 lines] > > - Show quoted text - On 28 , 19:24, "jphayc...@googlemail.com" <jphayc...@googlemail.com> wrote: > This worked but it keeps firing repeatedly. Do you know how i can make > it postback only once? Hi John, The method itself does not cause looping. It may be caused by program logic. It is hard to me to give more definite advice. Perhaps, if you want to call some method in Page_Load (not in textbox's OnTextChanged event handler) you have to test whether this postback was caused by change in textbox. I mean that if you call __doPostBack('TextBox1','') in javascript then you can process this postback in Page_Load if (Request.Params["__EVENTTARGET"] == "TextBox1") { //call some method here } Regards, Mykola http://marss.co.ua Thanks again Mykola The problem seems to be that each time the page loads the javascript is executed and this forces a postback so it gets stuck in a loop. I may have to rethink how I'm going about this Cheers John > Hi John, > The method itself does not cause looping. It may be caused by program [quoted text clipped - 11 lines] > Regards, > Mykolahttp://marss.co.ua Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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