Javascript variable problem - javascript

I have a variable in javascript:
var activeSearchButton = document.getElementById('<%=btnSearch.ClientID %>');
I want to set it like this:
<asp:TextBox ID="WFTo" runat="server" onchange="activeSearchButton = document.getElementById('<%=btnWFSearch.ClientID %>');"></asp:TextBox>
When I am trying to use the varible in javascript function, it is null. And the source shows:
onchange="activeSearchButton = document.getElementById('<%=btnSearch.ClientID %>');"
I noticed '& lt;' instead of "<". Is this the reason of my problem? Why does this happen? Or maybe there is another reason?
Thank you very much.

Just create a function in <script /> section
function setActiveSearchButton()
{
activeSearchButton = document.getElementById('<%=btnSearch.ClientID %>');
}
and use
<asp:TextBox ID="WFTo" runat="server" onchange="setActiveSearchButton()"></asp:TextBox>
EDIT:
As it turns out, you cannot use <%= .. %> for server side controls. You'll have to resolve to using a regular html input like this
<input type="text" onchange="setActiveSearchButton('<%= btnSearch.ClientID %>')" />
and
function setActiveSearchButton(buttonId)
{
activeSearchButton = document.getElementById(buttonId);
}
or leave the <asp:TextBox /> as it is and on Page_Load do
protected void Page_Load(object sender, EventArgs e)
{
WFTo.Attributes.Add("onchange", "setActiveSearchButton('" + btnSearch.ClientID +"')");
}

You can do this:
onchange='<% = string.Format("activeSearchButton = document.getElementById(\"{0}\");", btnWFSearch.ClientID) %>'
EDIT: As our friend said, we can only do this in a "input" control. For a TextBox the best way is add a parameter in codebehind.

Related

How do i close child window in asp.net c#?

I am now creating a web site with webforms in C#. I made a button that opens the child window with a landscape photo if pressed. On top of the landscape painting in the child window, comments written in the parent window are displayed.
The user can press this button to open as many child windows as they press, separate from the ASPX page with this button. Just press the button 10 times to open 10 pages of child windows with pictures of landscape paintings.
What I want to do is not press the button 10 times to create 10 child windows, but I want to update the child window 9 times after the child window is created in the first time.
If possible, I'd like you to tell me how to do it. Also, I thought that it would be difficult for me to do so, so I thought that if I pressed the button after the second time, the old child window created by pressing the button before that would close and a new child window would be born.
Below is the code I wrote.
↓aspx
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
↓aspx.cs
protected void Button1_Click(object sender, EventArgs e)
{
string url=string.Format("WebForm1.aspx?q={0:s}",TextBox1.Text);
Type cstype = this.GetType();
ClientScriptManager cs = Page.ClientScript;
cs.RegisterStartupScript(cstype, "OpenNewWindow", "window.open('" + url + "', null);",true);
}
The problem is twofold. One way is to update the child window. The other way is to close the child window. I thought that the line window would be closed with the code below, so I tried it lightly, but the parent window closed and the child window remained.
↓aspx.cs
protected void Button2_Click(object sender, EventArgs e)
{
string url=string.Format("WebForm1.aspx?q={0:s}",TextBox1.Text);
Type cstype = this.GetType();
ClientScriptManager cs = Page.ClientScript;
cs.RegisterStartupScript(cstype, "CloseNewWindow", "window.Close('" + url + "', null);",true);
}
What should I do?
I think you best consider having this pop up appear on the CURRENT page.
And now that you want to restrict to "one", then that makes this a WHOLE lot less work.
There are more "dialog" systems then flavors of ice cream to choose from.
but, the two most common are the bootstrap ones, and the one from jQuery.UI.
I find the jQuery.UI VERY easy to work with - and you can control position with much greater ease then bootstrap ones.
And given that you have a SUPER high chance of already having jQuery, then adopting jQuery.UI from the same folks makes all the more sense.
And jQuery.UI dialogs can be "modal", and that means focus can't get out of the dialog until you "ok" or "save" or whatever.
So, lets take a simple GridView. Say we have some rows, and a "image".
When we click on the edit button, we pop a dialog with the picture, and also allow you to edit the comments.
So, our Grid is say this:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataKeyNames="ID" CssClass="table" >
<Columns>
<asp:BoundField DataField="Fighter" HeaderText="Fighter" />
<asp:BoundField DataField="Engine" HeaderText="Engine" />
<asp:BoundField DataField="Thrust" HeaderText="Thrust" />
<asp:BoundField DataField="Description" HeaderText="Description" />
<asp:TemplateField HeaderText="View">
<ItemTemplate>
<asp:ImageButton ID="cmdView" runat="server" Width="150px"
ImageUrl = '<%# Eval("ImagePath") %>'
OnClick="cmdView_Click" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Code on page load is thus this:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
LoadGrid();
}
void LoadGrid()
{
SqlCommand cmdSQL = new SqlCommand("SELECT * FROM Fighters");
GridView1.DataSource = MyRstP(cmdSQL);
GridView1.DataBind();
}
And now we have this:
So, the way jQuery.UI works?
You create a simple "div" on the same page, and it will become your "dialog"
You then hide with style=display:none.
So our markup for this "div" to disaplay the picture "big" and edit comments is this
(we drop it below the GV)
So, we have this simple markup to display picture, and let user edit comments for the picture:
<div id="EditOne" runat="server" style="text-align:center;display:none" clientidmode="static">
<br />
<asp:Image ID="Image1" runat="server" width="90%" />
<br />
<h4>Edit Description</h4>
<asp:TextBox ID="txtDescription" runat="server"
TextMode="MultiLine" Columns="90" Height="100px">
</asp:TextBox>
<br />
</div>
<asp:Button ID="cmdSave" runat="server" Text="Save" ClientIDMode="Static"
style="display:none" OnClick="cmdSave_Click"/>
Note careful in above - right below the div, I have a hidden save button.
So, now the jQuery routine that we pop to display this div as a dialog:
this:
<script>
function popimage(btn) {
pWidth = "50%"
myDialog = $("#EditOne");
myDialog.dialog({
title: "Edit Comments",
modal: true,
width: pWidth,
closeText: "",
show: "fade",
buttons: {
Save: function () {
myDialog.dialog("close")
$('#cmdSave').click()
},
Cancel: function () {
myDialog.dialog("close")
}
}
})
}
</script>
So, now we only need our button row click from the grid (I used image button).
That code is this:
We get the current row PK id, pull from database, and fill out the "div", and then pop it:
protected void cmdView_Click(object sender, ImageClickEventArgs e)
{
ImageButton btn = (ImageButton)sender;
GridViewRow gRow = (GridViewRow)btn.NamingContainer;
int PK = (int)GridView1.DataKeys[gRow.RowIndex]["ID"];
SqlCommand cmdSQL =
new SqlCommand("SELECT * FROM Fighters WHERE ID = #ID");
cmdSQL.Parameters.Add("#ID", SqlDbType.Int).Value = PK;
DataTable rstFighter = MyRstP(cmdSQL);
Image1.ImageUrl = rstFighter.Rows[0]["ImagePath"].ToString();
txtDescription.Text = rstFighter.Rows[0]["Description"].ToString();
ViewState["rstFighter"] = rstFighter;
Page.ClientScript.RegisterStartupScript(
this.GetType(),"MyEdit","popimage()", true);
}
And now our save button, to send information back to database is this:
protected void cmdSave_Click(object sender, EventArgs e)
{
// Save comments (and other fields back to database)
DataTable rstFigher = (DataTable)ViewState["rstFighter"];
rstFigher.Rows[0]["Description"] = txtDescription.Text;
SaveData(rstFigher, "Fighters");
LoadGrid(); // refresh grid to show any edits
}
So, the results now look like this when I click on a row image:
Note how the web page behind goes "darker gray" and the pop up is model.
So, I would consider jQuery.UI dialogs.
And I did use two helper routines (after all, we don't write the same code over and over to get get a simple data table, right???).
Those two helper routines were:
DataTable MyRstP(SqlCommand cmdSQL)
{
DataTable rstData = new DataTable();
using (SqlConnection conn = new SqlConnection(Properties.Settings.Default.TEST4))
{
using (cmdSQL)
{
cmdSQL.Connection = conn;
conn.Open();
rstData.Load(cmdSQL.ExecuteReader());
}
}
return rstData;
}
void SaveData(DataTable rstData,string sTable)
{
using (SqlConnection conn = new SqlConnection(Properties.Settings.Default.TEST4))
{
using (SqlCommand cmdSQL = new SqlCommand("SELECT * FROM " + sTable, conn))
{
conn.Open();
SqlDataAdapter da = new SqlDataAdapter(cmdSQL);
SqlCommandBuilder daU = new SqlCommandBuilder(da);
da.Update(rstData);
}
}
}
So, as above shows you have complete control over closing the pop up dialogue, but MUCH more important we can then also with ease update the current page to reflect those changes ( in our example update the description text in our pick list GridView). And with both the grid display and editing on the same page we also require much less code.

Not getting hiddenfield value in javascript

I have an issue in getting the hidden field values, which is been set in page load at code behind. Problem is when i try to get that set values in javascript its giving undefined or null. Not able to get the values which was set in page load at code behind.
//cs code is like this
protected async void Page_Load(object sender, EventArgs e)
{
HiddenField_alt_edit.Value = "[{"unitid":"3072","unit_nameeng":"BOTTLE","purchcost":"2.000","salrate":"4.000","avgcost":"2.000","factor":"2"},{"unitid":"3073","unit_nameeng":"PKT","purchcost":"10.000","salrate":"20.000","avgcost":"10.000","factor":"10"}]";
ClientScriptManager script = Page.ClientScript;
script.RegisterClientScriptBlock(this.GetType(), "Alert", "<script type=text/javascript>addAlternativeRowWithData();</script>");
}
//aspx page declaration goes like this. Also i am using a master page.
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<asp:HiddenField ID="HiddenField_alt_edit" runat="server" Value="i am on."/>
</asp:Content>
// javascript file code goes like this
function addAlternativeRowWithData(mode)
{
alert("test");
var idvalue = $("#HiddenField_alt_edit").val();
alert(idvalue);
alert($nonconfli('#ContentPlaceHolder1_HiddenField_alt_edit').val());
var myHidden = document.getElementById('<%= HiddenField_alt_edit.ClientID %>').value;
alert(myHidden);
var json_string = $nonconfli('#ContentPlaceHolder1_HiddenField_alt_edit').val();
var arr_from_json = JSON.parse(json_string);
alert("test 2");
alert(arr_from_json);
}
The id generated at client side can differ as the Hidden field is server side control in your code as you have set runat="server".
There are two ways normally. Either make the ClientIDMode static or use the instance in form to get client side id.
Like:
<asp:HiddenField ID="HiddenField_alt_edit" ClientIDMode="static" runat="server"
Value="i am on."/>
and then following should work:
var idvalue = $("#HiddenField_alt_edit.ClientID").val();
or in client side code you need to get id like below:
var idvalue = $("#<%= HiddenField_alt_edit.ClientID %>").val();
Change:
HiddenField_alt_edit.Value = [{"unitid":"3072","unit_nameeng":"BOTTLE","purchcost":"2.000","salrate":"4.000","avgcost":"2.000","factor":"2"},{"unitid":"3073","unit_nameeng":"PKT","purchcost":"10.000","salrate":"20.000","avgcost":"10.000","factor":"10"}]
To this:
HiddenField_alt_edit.Value = "
[{'unitid':'3072','unit_nameeng':'BOTTLE','purchcost':'2.000','salrate':'4.000','avgcost':'2.000','factor':'2'},{'unitid':'3073','unit_nameeng':'PKT','purchcost':'10.000','salrate':'20.000','avgcost':'10.000','factor':'10'}]"
Then, add this:
<asp:HiddenField ID="HiddenField_alt_edit" runat="server" Value="i am on." ClientIDMode="Static" />
In you js, you have to put this:
const value = document.getElementById('HiddenField_alt_edit').value
const jsonString = JSON.stringify(value)
const json = JSON.parse(jsonString)
console.log(json)
<input hidden id="HiddenField_alt_edit" value="[{'unitid':'3072','unit_nameeng':'BOTTLE','purchcost':'2.000','salrate':'4.000','avgcost':'2.000','factor':'2'},{'unitid':'3073','unit_nameeng':'PKT','purchcost':'10.000','salrate':'20.000','avgcost':'10.000','factor':'10'}]">

how to pass selected row of gridview in popup window into parent page

I have 2 pages in asp.net with c# .
a parent.aspx and popup.aspx.
I passed a querystring(id) into page load of popup.aspx and used function to call row of table base on id and show gridview on popup.aspx.
now I want to select this row, and pass details into text boxes of parent.aspx that is open now.
Everything is ok and row of table is passed into text boxes, but it is into new window popup of parent.aspx page, that I don't want this.
I want pass details into this page(parent.aspx) that now is open.
How can I do that.thanks.
below is my code for pass id to pop-up window
protected void btn_search_id_Click(object sender, ImageClickEventArgs e)
{
string str1 = Encrypt(txt_sh_p.Text);
btn_search_id.Attributes.Add("onclick", "window.open('popup.aspx?sh_p_=" + str1 + "','Report','width=750,height=500,toolbar=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,left=200,top=50'); return false;");
}
my code for reading id and select row and display row in gridview on page load event of popup.aspx:
protected void Page_Load(object sender, EventArgs e)
{
DAL.Sab_Ashkh sabt_ashkh = new DAL.Sab_Ashkh();
List<DAL.Sab_Ashkh> sabt_ashkh_list;
sabt_ashkh.sh_p = Decrypt(Request.QueryString["sh_p_"]);
sabt_ashkh_list = sabt_ashkhDB.GetShakh_find(sabt_ashkh.sh_p);
grid_ashkh.Visible = true;
grid_ashkh.DataSource = grid_ashkh_list;
grid_ashkh.DataBind();
}
and html code for pass row to parent page:
<Columns>
<asp:HyperLinkField DataTextField="id_shakh" DataNavigateUrlFields="id_shakh" DataNavigateUrlFormatString="parent.aspx?id_shakh={0}"
HeaderText="id" ItemStyle-Width = "150" />
<asp:TemplateField HeaderText="select">
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField ItemStyle-Width = "150px" DataField = "sh_p" HeaderText ="kod"
>
<ItemStyle Width="150px"></ItemStyle>
</asp:BoundField>
</Columns>
I am just telling you how you can change the variable in Main page in popup page like:
Suppose Parent.aspx have:
<script type="text/javascript">
var items =[];
</script>
and in popup.aspx you can do something like :
window.opener.items.push(yourSelectedRows);
but as another workaround you can also use local storage like:
localStorage.setItem("selectedRecords", JSON.stringify(selectedRows));
suppose selectedRows are your array of object or anything else but as my experience the selectedRecords would be accessible in all HTML pages.
hope this help you.
Hi Aria Thanks for reply. I pass id by query string into popup window and show gridview . and this script for popup win :
<script type="text/javascript">
function SetName() {
if (window.opener != null && !window.opener.closed) {
var txtName = window.opener.document.getElementById("txt_id_mah");
grid = document.getElementById("grid_ashkh");
var cellPivot;
if (grid.rows.length > 0) {
for (i = 1; i < grid.rows.length; i++) {
cellPivot = grid.rows[i].cells[1];
TXT.value = cellPivot;
}
}
}
window.close();
}
</script>
but does not work.

How to change a server side label display to Block in javascript?

How can I change the display property of my server side label to Block?
<asp:Label id="lblError" runat="server" style="display:none;"></asp:Label>
function block()
{
// change display property to block
}
I tried
document.getElementById('lblError').style.display = "block";
but it's not working, please help me.
use ClientIDMode :
<asp:Label id="lblerror" runat="server" ClientIDMode="Static" style="display:none;"></asp:Label>
and in client:
document.getElementById('lblerror').style.display = "block";
Should be:
document.getElementById('lblError').style.display = "block";
Or you can use a safer way:
var buttonID = '<%= lblError.ClientID %>';
var button = document.getElementById(buttonID);
if (button) {
button.style.display = 'block';
}
It also looks like youv'e missed a double quote after style=. It should be :
<asp:Label id="lblError" runat="server" style="display:none;"></asp:Label>
One way to access a control from client script is to pass the value of the ClientID property of the server control to the document.getElementById method. Like this:
document.getElementById('<%= lblerror.ClientID %>').style.display = "block";
Have a look at this: How to: Access Controls from JavaScript by ID.

couldn't get value into javascript from a asp Label which value bind from code behind

Can't get value from getValue in JS and can't show value in showValue field.
Thanks in advance
ASPX PAGE CODE
<script>
var x = document.getElementById("<%=getValue.ClientID %>").innerHTML;
document.getElementById('showValue').innerHTML = x;
</script>
<asp:Label runat="server" ID="getValue" />
<asp:Label runat="server" ID="showValue" />
C# CODE
getValue.Text = "value from code";
You need to call javascript once all the controls are rendered, then only you can get the proper id of the <asp:label> control, so you need to write that javascript code under window.onload().
Also for showValue, you need to use ClientID.
window.onload= function(){
var x = document.getElementById("<%=getValue.ClientID%>").innerHTML;
document.getElementById('<%=showValue.ClientID %>').innerHTML = x;
};

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