How to make the Default focus in content page from master page

问题

I have masterpage with content place holder. i have contentpage which is using master page . in all my content page i need to default focus on the text box so that the user can directly type in text box instead moving the mouse over the textbox. in some page there is no text box so that i donnot nnet keep default focus over there

Is there any way i can do it in my master page once and can reuse that in all my content page

thank you

回答1:

try using this...

((TextBox)Master.FindControl("txtRequiredFocus")).Focus();

回答2:

Indiscriminate JavaScript approach to selecting the first valid input field on a page:

function SelectFirstInput() {
    var bFound = false;
    for (f = 0; f < document.forms.length; f++) {
        // for each element in each form
        for (i = 0; i < document.forms[f].length; i++) {
            // if it's not a hidden element
            if (document.forms[f][i].type != "hidden") {
                // and it's not disabled
                if (document.forms[f][i].disabled != true) {
                    // set the focus to it
                    document.forms[f][i].focus();
                    var bFound = true;
                }
            }
            // if found in this element, stop looking
            if (bFound == true)
                break;
        }
        // if found in this form, stop looking
        if (bFound == true)
            break;
    }
}

回答3:

You could include this in your master page's load event:

// if the ID is constant you can use this:
/*TextBox textBox = (TextBox)Page.Controls[0]
                                .FindControl("ContentPlaceHolder1")
                                .FindControl("myTextBox");
*/

// this will look for the 1st textbox without hardcoding the ID
TextBox textBox = (TextBox)Page.Controls[0]
                            .FindControl("ContentPlaceHolder1")
                            .Controls.OfType<TextBox>()
                            .FirstOrDefault();

if (textBox != null)
{
    textBox.Focus();
}

This would match up with a content page that has the following markup:

<asp:Content ID="Content" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <asp:TextBox ID="myTextBox" runat="server" />
</asp:Content>

EDIT: if LINQ isn't an option then you can use this instead:

foreach (Control control in Page.Controls[0].FindControl("ContentPlaceHolder1").Controls)
{
    if (control is TextBox)
    {
        ((TextBox)control).Focus();
        break;
    }
}

回答4:

<script language="javascript" type="text/javascript" >


window.onload=function(){
var t= document.getElementById('<%=TextBox1.clientID %>');
t.focus();
}


</script>

回答5:

If you use jQuery, a possible solution is:

Give the textbox you want to set focus to a special class. "focus" works well for this purpose.

Write code such as the following in your master page or included by your master page in a js script file:

$(document).ready    
(

  function()
  {
    //get an array of DOM elements matching the input.focus selector
    var focusElements = $("input.focus").get();

    //if a focus element exists
    if(focusElements.length > 0)
    {
      focusElements[0].focus();
    }
  }
);

A similar approach using vanilla JavaScript would be to tag the textbox with a special attribute. Let's use focus.

window.onload = function()
{
  //get all input elements
  var inputElements = document.getElementsByTagName("input");

  var elementToFocus = null;

  for(var i = 0; i < inputElements.length; ++i) 
  {
    var focusAttribute = inputElements[i].getAttribute("focus");

    if(focusAttribute)
    {
      elementToFocus = inputElements[i];
      break;
    }
  }

  if(elementToFocus)
  {
    elementToFocus.focus();
  }
};

回答6:

Control masterC = 
Page.Master.FindControl("ContentPlaceHolder1");
    TextBox TextBox1 = 
masterC.FindControl("TextBoxUsername") as TextBox;

TextBox1.Focus();

来源：https://stackoverflow.com/questions/1403498/how-to-make-the-default-focus-in-content-page-from-master-page

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