Web Forms :: Javascript Block Must Be Placed Before Html?
Jun 6, 2010
I'm new to ASP.net 3.5 and creating a test web site. I have created a master page for my web site with page content blocks. Now I want to use some javascript on the client side to provide for more interaction. I would normally create page specific Javascript functions and insert them in a <script block on the page. Howevere the Javascript script block must be placed before the <HTLM block. If I'm using Master Pages, it doesn't seem that I can use page specific Javascript functions. How can I resolve this problem? I think my options are
1) Don't use Javascript. Use ? instead to write client-side code.
2) Don't use Master Pages because you cannot use Page Specific Javascript functions.
3) Here's how to insert Javascript Functions in a Page with a Master Page.
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Jan 17, 2011
In the Script documents that asp.net automatically generates how can I surround the whole generated scripts with try/catch statement to avoid 'Microsoft JScript Compilation error'
My issue is: i got a DevExpress control (ASPxGridView) that added and set-up in run time, since i activated the grouping functionality in the grid I still get JS error says ';' expected whenever i use (click) on one of grouping/sorting abilities, I activated script Debugging for IE, in the JS code turns out that there is no missing ';' and once i click ignore for the error msg that VS generates every thing works fine, and surly end-user can't see this msg so i figured out if i try/catch the script that may help avoid this error.
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Jun 10, 2010
Since everyone yells at me that MessageBox doesn't work when the project is uploaded to the server, I need to migrate to javascript alert box. As I was changing my MessageBoxes, I tested and found that they weren't being produced. I'm not sure if it matters, but they are in a try/catch block, which is shown here:[Code]....
This all worked before when I had MessageBox - it showed, then the page redirected when I clicked Ok.
I either don't understand how try/catch works, the javascript isn't adding, or Response.Redirect is executed before I can see the alert box and click Ok on it.
(just as a note, everything works fine, but the alert box doesn't show)........if I add the (javascript) code before the try block, the alert box comes up, so it's not something wrong with the writing of the javascript or executing it at least (I think).
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Aug 6, 2010
I'm reading an invoice dataset and building a html table with checkboxes and textboxes in it, and I put that code in a postback = false block, then i got a button and a literal. The button click will loop through the html table checkboxes to calculate a total and assign it to the literal and display it. I got everything working except one thing, every time i click the button, the html table refreshes and lost all the value in textboxes....even though I put the html building block in the postback = false block,it seems like it still won't preserve the values in the textboxes once there's a button click...Anybody knows a solution to that? I want the textboxes keep what values are there.
Here is the code part:
[code]....
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Jul 2, 2010
I like to convert html for example a table to and image and save as jpg.(what I mean is that a table displayed on web page, I only want to get that specific table and save as image) Is it possible using asp.net?
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Jul 2, 2010
I have written an Http Module that hooks onto the Response.Filter property of the current request and does various replacements within the HTML before it is sent to the client.All the work is done in the Write method which is overriding Write in the base class Stream.
The Write method is called multiple times for a single response - the HTML seems to be written to the output stream in chunks. My problem is that I don't have an efficient & reliable way of telling if the current chunk is the last chunk (for why I want to know this see below). The only way I have come up with is to check if the chunk contains a closing html tag - but this is not very efficient or reliable.
The reason this is needed is that the module must add the "Refresh" HTTP header to the response, but only if the HTML fulfills certain conditions (and there are certain conditions that mean the header must not be added). So, only when the last chunk has been seen does the code know if the header can be added or not. So, I either need a test for the last chunk, or on each call to Write I add the header if the current block of HTML passes the test (if it has not already been added) or remove the header if the current block of HTML fails the test (if it has already been added).
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Dec 9, 2010
If I have an array variable singletext with javascript code like below
[code]...
How can I assign the value of singletext[0] and singletext[1] to a literal control literal1, that I grab from the code behind?
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Nov 20, 2010
This is a problem I'm facing in a webapp I'm currently working on. So instead of cluttering the question with unrelated code, I recreated the problem in an isolated, simplified webapp that only demonstrates this issue.
I have a web user control with just this as its content:
<% if (ShowAlertScript)
{ %>
<script type="text/javascript">
function AlertMe()
{
alert('Hello World!');
}
</script>
<% } %>
<input type="button" onclick="AlertMe()" value="Say Hello" />
And its codebehind has nothing more than the boolean definition of ShowAlertScript. This represents a control I have in the big webapp that has two modes: input mode, and display mode. When in input mode, it has a large javascript block that is only useful then; it does some cool stuff to help the user input the info.The way this control is laid out in the big picture is as follows:
<asp:ScriptManager runat="server" />
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:MultiView ActiveViewIndex="0" runat="server" ID="mvw">
<asp:View runat="server">
<asp:Button runat="server" ID="btnSwitch"
OnClick="btnSwitch_Click" Text="Switch" />
</asp:View>
<asp:View runat="server">
<uc:MyInputControl runat="server" ID="micInput" ShowAlertScript="true" />
</asp:View>
</asp:MultiView>
</ContentTemplate>
</asp:UpdatePanel>
When you click btnSwitch, it simply switches to the second view with the user control. Notice how I have the ShowAlertScript already initialized to true. The potential output is that since I'm "showing the alert script" within the user control, the AlertMe() function will execute when you click the input-button element, because it's written out according to the inline if statement.
If you run this code I gave you so far as is, it will not work. The browser will say it can't see the AlertMe() function; it's undefined as far as it knows. But if you take out the UpdatePanel (or disable the ScriptManager's partial rendering), it will work just fine on a full postback when you click btnSwitch.
I want it to work on a partial postback, because this whole thing is a small piece compared to the rest of the page, and I don't want to do a full postback every time they switch views. Apparently, the ScriptManager doesn't even bother re-rendering the ascx file for possible changes. Either the ScriptManager is not smart enough, or there is an option I'm missing to let it render the <script> so I can invoke its methods on the client side. A potential answer someone might suggest is "why don't you take out the javascript, put it in its own .js file, and have the page reference it so it's available to the control?"
That won't really work with me, because the script block does some initialization and modification that pertain to that single control instance, not to all others on the page.
In turn, you might also be concerned that if I have more than one instance of the control, I end up with copies of the same script. Not really; there will only be ONE input mode of this control in a page at any given time, it's just that I have those two modes in two separate views and I let the user switch between them.
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Aug 13, 2010
I have js script block (very long one that does editing capabilities to an invoice page).
I want to enable/disable this functionality on the server-side. First thing popped up on my mind was to say runat="server" to the tag, and set visible=true/false to asp.net, thinking asp.net does not render the HTML for non-visible items, so the block wouldn't load at all, which was what I wanted. But I quickly realized that saying runat="server" to client-side code was a real bad idea :)
What ar emy options, besides loading script from client side. Cuz I have other buttons that come from the server-that will enable dieable too.
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Oct 22, 2010
I am trying to call a JavaScript function from my ascx control code behind in the catch blockI have tried the below two ways but they don't seem to work.
Page.ClientScript.RegisterClientScriptBlock(typeof(string), "script", "test();", true);
ScriptManager.RegisterStartupScript(Page, GetType(), "err_msg", "alert('error');", true);
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Jan 29, 2011
I have menu item on my master page that has block around the text when the page is first run. I wrote in the css on the link and visited property to change the color to match the image color that it is on. When a menu item is clicked the color changes to the right color. How do I get it to the right color on when the page first opens or is there a way to get rid of the block or make it transperant?
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Oct 25, 2010
I have 2 separate code-block asp.Net expressions in an aspx markup, with an html content between (span element in the example below). In the first code-block, there is "i" as an increment variable for the for loop.Then the code-block is cut with an html content.And another code-block expression is opened but as I see I can reach the "i" variable which was declared in the previous code-block.
So, how asp.net handles -compiles- the pieces of code-block experrions declared in the mark up? Does it check the semi-colons and generates some anonymous methods which will end up with many calls to Response.Write in the last place?
<p>
<%for (int i = 0; i < 30; i++)
{
[code]....
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Jan 16, 2010
do you think it would be difficult to write a framework where mvc compares last html it output to the current html we want to output, and instead of sending the entire html, figure out what has changed and generate js code that will do the updating as compared to previous html? (presuming nothing was manually changed on the client using js).
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Jul 20, 2010
I think I need to drop in some escape characters, but I'm not quite sure where. Here is the javascript function I'm attempting to call:
function setData(associateValue, reviewDateValue) {
var associate = document.getElementById("Associate");
var reviewDate = document.getElementById("ReviewDate");
associate.value = associateValue;
reviewDate.value = reviewDateValue;
}
Here is the asp .net mvc line where I'm attempting to create a Radio button with a click event that calls the above function and passes data from the model as javascript parameter values.
<%= Html.RadioButton("Selected", item.Selected, new { onClick="setData('<%=item.Associate%>','<%=item.ReviewDate%>' )" } )%>
The above throws a bunch of compile issues and doesn't work. A call such as the following does call the javascript, but doesn't get the data from the model.
<%= Html.RadioButton("Selected", item.Selected, new { onClick="setData('item.Associate','item.ReviewDate' )" } )%>
<%= Html.RadioButton("Selected", item.Selected, new { onClick="setData('item.Associate','item.ReviewDate' )" } )%>
<% String functionCall = String.Format("setData('{0}','{1}')", Html.Encode(item.Associate), Html.Encode(item.ReviewDate )) ; %>
<%= Html.RadioButton("Selected", item.Selected, new { onClick=functionCall } )%>
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Dec 18, 2010
Im using the HTML.TreeView to render my code structure like this :
<%= Html.TreeView("CategoryTree",
Model.CategoryList,
l => l.ChildList,
l => l.Name + " / <a id="treeLnk" + l.Id + "" href="JavaScript: OpenAddDialog('" + l.Name + "', " + l.Id + ") " title="Lägg till" >Lägg till</a>" +
" / <a id="treeLnk" + l.Id + "" href="JavaScript: OpenChangeNameDialog('" + l.Name + "', " + l.Id + ") " title="Ändra namn" >Ändra namn</a>" +
" / <a id="treeLnk" + l.Id + "" href="JavaScript: OpenDeleteDialog('" + l.Name + "', " + l.Id + ") " title="Tabort" >Tabort</a>") %>
This work fine, but now I need to include a action that redirects to another controlleraction.
I have tried to ad a Html.ActionLink but this does not work?
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Apr 17, 2010
i got a question that realy bothering me .... for the last 24 hours ...
how to combine c# and html/javaScript .....??
so ... the question :
for example i create a varible in my asp.net form .......
int variable = 2;
// some function .....
protect int makeItdouble(int variable)
{
return variable*2;
}
variable = makeItdouble(5); // some code i
and now i want to take this "variable" into my my javascript code .... this important thing is that i want thet this function will run first .... (the C# function)cus i take first my DataBase from the server and that prosses him more with some javascript code ...
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Apr 10, 2010
I have a literal control in markup. I am generating html layout in C# and then set the text property of literal to the html.
StringBuilder sb = new StringBuilder()
sb.Append("my html.....");
lt.Tex = sb.ToString();
Some of these html elements need to post back and call a function on the server side. I googled and found a couple of posts using __doPotsBack, but it is not working. Below is how I am adding an image and adding onclick script.
sb.Append(string.Format("<img title="Add" src="images/Add.gif" onclick="javascript:__doPostBack('Add','');return false;"/> "));
It does cause postback, but Add function is not called. Additionally I want to pass some parameters to Add function.
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Jan 17, 2011
With embedded Javascript in an html page, I would use the following to get the ID of a control.
[Code]....
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Feb 22, 2011
i am trying to get html input value from codebehing using name attribute of input
the input is created by client on dropdownlist change event
html input like <input type=text name=myinput value="123"/> and codebehind code like Request.Form("myinput") is nothing
also Request.Form.AllKeys does not contain name of myinput
my question is it is possible to get html input value that created on an event with javascript from codebehing using formnamevaluecollection
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Jan 24, 2011
I have a function that gets the position of a control.
[Code]....
All the function needs is an htmlcontrol being fed to it as the parameter (elemRef). I can declare a variable in Javascript of the same content page but different function and pass the parameter successfullly getting returned values. For example, if I have the following function:
function (getPosition)
{ var txtBox1 = document.getElemendById('<%=txtBox1.ClientID %>');
getPos(txtBox1);
}
I will get the coordinates of the control txtBox1. But how can I accomplish this if I am calling this function from a javascript function or codebehind of the Master Page, or codebehind of the same content Page.
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Jan 28, 2011
I have a page with a control like this:
<asp:Button ID="test" runat="server" Text="test" OnClientClick="pageTracker._trackPageview('/bezichtigingsform/deeplink')" />
The OnClientClick-attribute is rendered as:
onclick="pageTracker._trackPageview('/bezichtigingsform/deeplink')"
When I try to escape the single-quote like this "'" or with a double backslash preceeding the single quote, this does not work. I also tried it like this:
string str = "pageTracker._trackPageview('/bezichtigingsform/deeplink'";
test.Attributes.Add("onclick", str.Replace("'", "\'"));
and of-course I tried all possible escaping-combinations in the above too.
It seems like asp.net just encodes the value, but how can I stop this? I want to be able to generate neat html/javascript-code...
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Dec 24, 2010
When someone requests a web form, I want to use Javascript to see what browser they use, and then point to the correct css files with Javascript. What is the simplest way to do that.
For example, in my header of the html form, I have a link that says:
[Code]....
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Mar 8, 2010
How to maintain view state for the dynamically added html controls to a table using javascript(Below is the javascript which I am using to add HTML Controls Dynamically"). Because during the postbacks if I found any error while validating the data present in the dynamically added html controls, the controls are loosing their state and again I need to start adding rows and add data.
[Code]....
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Sep 18, 2010
why the ValidateRequest dose not work when html tags had sent by __doPostBack method in javascript.
[Code]....
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Mar 5, 2010
I have a page with a table and two button with the names (Submit and Add Rows) When I click on Add Row a new row will be added to a page(This is achieved using javascript), when I click on submit button I will be doing server side validation. If I found any error the error will be displayed on the page. During this process the controls which were added by me were loosing its state. As a result I need to add the rows once again and need to fill the data and click on submit button. Can any one let me know how to avoid this and see that the controls donot loose their states. So that there is no need for me to create rows once again if any validation fails on the server side.
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