I have a search textbox in asp. And I want it to send request to the server each time the text is changed there. I have a javascript function which sends request but it is not being called each time when I type something in the text box. How can I call javascript function from ASP textbox?
That is my textbox:
<asp:TextBox ID="search" name="Search" runat="server" onchange="javascript:text_changed();"></asp:TextBox>
That is my js function:
function text_changed() {
searchedword = document.getElementById("ContentPlaceHolder1_search").value;
SendRequest();
}
You should use onKeyPress event to call the function.
<asp:TextBox ID="search" name="Search" runat="server" onKeyPress="javascript:text_changed();"></asp:TextBox>
Shivam's answer is right. You can use KeyPress event to get users key strokes with that event.
But i want to inform you, you should not use ASP.NET control ids like that :
document.getElementById("ContentPlaceHolder1_search").value;
Because you'll get errors if you put your textbox somewhere else in html hierarchy, ASP.NET regenerates it's id.
Try that one, instead :
function text_changed(textObj) {
searchedword = textObj.value;
SendRequest();
}
<asp:TextBox ID="search" name="Search" runat="server"
onKeyPress="javascript:text_changed(this);"></asp:TextBox>
The functionality you asking can achieve by
Use onkeyup or onkeydown instead.
This will then run the function when you type or click on the textbox. You can also then detect the keycode of the event, and prevent the function if you dont want it to run for certain keys.
Use the below code
$("#search").keydown(function(){
text_changed();
});
$("#search").keyup(function(){
text_changed();
});
Demo Here
give it a try :)
$("#search").change(function(){
//your ajax codes
});
<script>
function multy(val)
{
alert(val.value+"--"+val.id);
}
</script>
<input id="txtdemo" type="text" onchange="multy(this);"></br>
<input id="txtdemo" type="text" onchange="multy(this);">
</input>
Thanks... :)
Related
I use TextBox WebForm Control configured like a Bootstrap Datetimepicker.
And I need to initiate server side TextChanged event.
The code I have does not work so it does not call server side part.
HTML
<div class='datepicker input-group date' id='datetimepickerStart'>
<asp:TextBox ID="StartDate" class="form-control dateField" placeholder="Fecha" required runat="server" OnTextChanged="StartDate_TextChanged"></asp:TextBox>
<span class="input-group-addon">
<span class="glyphicon glyphicon-calendar"></span>
</span>
</div>
C#
protected void StartDate_TextChanged(object sender, EventArgs e)
{
// It does not fire :(
}
I try to force this event like this but no joy.
JS
$('#datetimepickerStart').datetimepicker();
$('#datetimepickerStart').datetimepicker().on('dp.change', function (event) {
console.log(event.date);
$('#StartDate').change(); // It does not help
$('#StartDate').html(event.date); // It does not help
});
Any clue how to fix it?
After searching a lot on the Internet I found this solution that worked to me:
$('#datetimepickerStart').datetimepicker().on('dp.change', function (event) {
__doPostBack('<%= Page.ClientID %>');
});
And on the code-behind:
public void RaisePostBackEvent()
{
// Do whatever, maybe call the OnTextChange method.
}
You can even pass some arguments in the like:
__doPostBack('<%= Page.ClientID %>', argument);
and
public void RaisePostBackEvent(string Arg){...}
In order for the TextChanged event to fire when you leave the textbox, you have to set the TextBox control's AutoPostBack property to true.
https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.autopostback(v=vs.110).aspx
<asp:TextBox ID="StartDate" class="form-control dateField" autopostback="true" placeholder="Fecha" required runat="server" OnTextChanged="StartDate_TextChanged"></asp:TextBox>
You also need to make sure that the name of the event handler for OnTextChanged matches the name of the method in your code (maybe this was just a typo).
Finally, I've found the TextChanged event to be a bit finicky and cause unwanted postbacks, page scrolling, loss of focus, etc., so you may want to consider using a client-side solution (eg. JQuery) instead.
name of method not correct, add autopostback= 'true' to textbox
Change this line to
<asp:TextBox ID="StartDate" class="form-control dateField" placeholder="Fecha" AutoPostBack="True" required runat="server" OnTextChanged="EndDate_TextChanged"></asp:TextBox>
and it will be ok.
Solution is to add ApiController and consume via JQuery what I need.
https://blogs.msdn.microsoft.com/henrikn/2012/02/23/using-asp-net-web-api-with-asp-net-web-forms/
By default ASP.Net page caches all the server control changed events and executes after Postback event.
So override this default by setting Autopostback property of a control to true like below.
In my web application I need a functionality so that when users click on textbox to input values, it should make the button and the other fields visible?
I am using the code provided below but, could not get it working.
C#:
protected void TextBox1_Click(object sender, EventArgs e)
{
ButtonSearch.Visible = true;
}
ASP.NET:
<asp:TextBox ID="TextBox1" runat="server" OnTextChanged="TextBox1_TextChanged" OnClick="TextBox1_Click"></asp:TextBox>
<asp:Button ID="ButtonSearch" runat="server" OnClick="ButtonSearch_Click" Text="Search" Visible="False" />
How to accomplish this?
Set AutoPostback="True". This way the event will be fired server-side, and the button will become visible.
<asp:TextBox ID="TextBox1" runat="server" OnTextChanged="TextBox1_TextChanged" OnClick="TextBox1_Click" AutoPostBack="true"></asp:TextBox>
However, if you only want to toogle visility of a button, you really should considerate javascript. This will save a trip back to the server.
<asp:TextBox onclick="txtBox1_ClientClicked()" ID="TextBox1" runat="server" OnClick="TextBox1_Click"></asp:TextBox>
<asp:Button ID="ButtonSearch" runat="server" OnClick="ButtonSearch_Click" Text="Search" style="display:none;" />
<script type="text/javascript">
function txtBox1_ClientClicked(){
var theButton = document.getElementById('<%=ButtonSearch.ClientID%>');
theButton.style.display = 'block';
}
</script>
You do not need to post back to the server to accomplish your job. You can use client side onFocus event and javascript/jquery, for example.
I know I used an input of type text, and you are using an ASP Control which posts on server, but here is a JSFiddle to get you on the right track: http://jsfiddle.net/Mmjtz/1/
$("<%= ButtonSearch.ClientID %>").click(function(){
$("#TextBox1").show():
});
In this code you need to pass fields ID which you want to visible on the click of button.
Put the textbox inside a div and use the div's onClick event from codebehind. It's not what you asked but it works for me without any errors. Here is a javascript function to implement requested event:
function toggleVisibility()
{
document.getElementById('TextBox1').disabled = true;
/*
...some other code...
*/
}
And of course, you have to define your onclick event at the div definition after implementing this JS function.
<div id="TBdiv" onClick="toggleVisibility()">
<asp:TextBox ID="TextBox1"..../>
</div>
IMPORTANT: Since you now disabled your TextBox from codebehind, you have to enable it in somewhere before you want to use it again. Otherwise you will not see it while the page is running.
jQuery is the perfect solution for your problem. The code would be something like this:
$("#TextBox1").on("click",function(){$("#ButtonSearch").css("visibility", "visible");})
You include the script by adding <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> to the page and then you can add the piece of code above to within <script></script> tags.
So i have a checkbox and when it its checkSate is changed i want it to call a method.
heres my checkbox:
<tr><td><input type="checkbox" id="check2" name = "check2" Checked="True" runat="server" OnCheckedChanged="OnCheckedChangedMethod(count);">Sensor 1</input></td></tr>
then in my script i have:
<script type="text/javascript">
function OnCheckedChangedMethod(count) {
document.getElementById('mc_comboView_players').innerHTML = "<h1>" + count + "</h1>";
}
/*other functions*/
</script>
i have invoked the method via a button so i know that its works, its just not being called.
Any ideas, i think i have some wronge syntax but have not been able to figure it out.
ps i have looked else where first
Use onchange instead of OnCheckedChanged as OnCheckedChanged is not javascript event for checkbox change.
Also pass some valid value in OnCheckedChangedMethod as count might be undefined
<input type="checkbox" id="check2" name = "check2" Checked="True" runat="server" onchange="OnCheckedChangedMethod(7);">
Also you could use JQuery Change event that triggered on checkbox changes. Here you can find working example.
I have an ASP.NET web form where I have an hidden field, like this:
<form id="form1" runat="server" action="http://localhost/fa/Default.aspx">
<div>
<input id="requestData" type="hidden" name="requestData" value="" runat="server" />
<asp:Button ID="btnPOST" Text="POST" runat="server" OnClick="do_POST" />
</div>
</form>
On the method do_POST I have this:
protected void do_POST(object sender, EventArgs e)
{
//requestDataField is of the type protected global::System.Web.UI.HtmlControls.HtmlInputHidden requestData;
requestDataField.Text = "FOO!";
}
When I submit the form (by pressing the button), it goes to the server (an handler) wheer I have this:
string requestData = context.Request.Form["requestData"];
I get an empty string..
But if I assign a value like this:
<input id="requestData" type="hidden" name="requestData" value="FOO" runat="server" />
I get the "FOO"
What am I missing?
The reason why it's not doing it is because the method is called after the page has been post back. Meaning, it is actually working if you change .Text to .Value unfortunately by that time you have already read your form and it was an empty value. I remember working on a project where you could tell your form not to submit until a function has been run (but it was with a javascript that needed to run an complete before aspx submitted). You should try to see if there is a way to force your form to run your function BEFORE doing the postback.
Your do_POST method runs on the server, not on the client, and so is setting the value of the server-side object which represents the <input> control. Your context.Request.Form["requestData"] gets the value of the field from the client side data submitted in the POST request, which was never set, so it is blank.
If you want the onClick to be a client-side function, then you need to do it a little differently. Use the OnClientClick attribute (instead of onClick). Then create a javascript method to set the field value:
<asp:Button ID="btnPOST" Text="POST" runat="server" OnClientClick="do_POST" />
<script>
function do_POST() {
document.getElementById("requestData").value = "FOO!";
}
</script>
I tried your code and did few changes to it.
Change requestDataField.Text = "FOO!"; to requestData.Value = "FOO";
Also I added two buttons. One for do_POST function and the UseSubmitBehaviour property is set as False. The other one was to submit the form.
If you want to set it on client side then you will have to use Javascript.
Use "Value" instead of "Text" property for HtmlInputHidden control:
requestDataField.Value = "FOO!";
instead of
requestDataField.Text = "FOO!";
Which type of event would i place on a textbox to cause an action on the web form when the cursor leaves that textbox ?and how can i implement this?
I actually want to display a message on the form after details have been entered in the last textbox to notify users if they have left any field blank. I hope to apply this on the last textbox on the form.
I know an event handler shoud be able to instantiate this but am not sure which event would do this and how to implement it....
all advices are warmly welcome..
Thank you..
I think you are probably going to want to look at the ASP.NET validation controls. They should be able to handle what you are wanting to do.
http://devhood.com/Tutorials/tutorial_details.aspx?tutorial_id=46
http://msdn.microsoft.com/en-us/library/aa479045.aspx
You'll need to use javascript on the client to handle this. What you want to do is add a handler for the blur event. The blur event occurs when an element loses focus. Use this in conjunction with your client-side validation logic to trigger validation when the field loses focus.
I prefer adding my javascript unobtrusively. Below is an example of how you would do it using jQuery and the jQuery validation plugin. Using it with standard ASP.NET validators would work as well, just replace the call to the validation logic with that for your client-side validators, i.e., call Page_ClientValidate().
<script type="text/javscript">
$('form').validate(); // set up validation
$('#lastTextBoxID').blur( function() {
$('form').valid(); // validate when the blur event happens
});
</script>
You can put the textbox inside a div and add ur function in the event of onmouseover()
like this :
<div onmouseover="ChangeFocus()">
<asp:TextBox runat="server" ID="TxtBox1"></asp:TextBox>
</div>
<script type="text/javascript" language="javascript">
function ChangeFocus()
{
var Details = document.getElementById('<%=TxtBox1.ClientID %').text;
//Display the details of the textbox in the place u need
}
</script>
And take care to adjust the width of the div and the textbox to fit it.
or u can replace asp textbox with input field of type "text" and set it's event onmouseover to the function ChangeFocus().
Hope that this will be usefull
You could do something like this:
<asp:ValidationSummary ID="ValidationSummary1" runat="server" />
<asp:TextBox ID="txtName" runat="server" />
<asp:RequiredFieldValidator
ID="RequiredFieldValidator1"
runat="server"
ErrorMessage="The name field is required."
ControlToValidate="txtName" Display="None">
</asp:RequiredFieldValidator>
<asp:Button ID="btnSubmit" runat="server" Text="Submit" />
Could the TextChanged event be a likely solution? and when would this event occur?
I tried that but it didnt work... It appears that the event fires after the page has been validated (on button click).
any work arounds?