ASP NET set hiddenfield a value in Javascript

Question

I don t know how to set the value of a hiddenField in Javascript   Can somebody show me how to do this   Javascript   document getElementById  hdntxtbxTaksit   value         HTML    lt asp HiddenField ID  hdntxtbxTaksit  runat  server  Value    Visible  false  gt     lt  asp HiddenField gt       error    Unable to get value of the property   value    object is null or undefined

User · Answer

My understanding is if you set controls Visible   false during initial page load  it doesn t get rendered in the client response  My suggestion to solve your problem is  Don t use placeholder  judging from the scenario  you don t really need a placeholder  unless you need to dynamically add controls on the server side  Use div  without runat server  You can always controls the visiblity of that div using css  If you need to add controls dynamically later  use placeholder  but don t set visible   false  Placeholder won t have any display anyway  Set the visibility of that placeholder using css  Here s how to do it programmactically    placeholderId Attributes  style      display none     Anyway  as other have stated  your problems occurs because once you set control visible   false  it doesn t get rendered in the client response

User · Answer

First you need to create the Hidden Field properly   lt asp HiddenField ID  hdntxtbxTaksit  runat  server  gt  lt  asp HiddenField gt  Then you need to set value to the hidden field  If you aren t using Jquery you should use it   document getElementById   lt    hdntxtbxTaksit ClientID   gt    value    test    If you are using Jquery  this is how it should be        lt    hdntxtbxTaksit ClientID   gt    val  test

User · Answer

document getElementById   lt   hdntxtbxTaksit ClientID  gt    value   The id you set in server is the server id which is different from client id

User · Answer

try this code       hdntxtbxTaksit   val  test

User · Answer

I suspect you need to use ClientID rather than the literal ID string in your JavaScript code  since you ve marked the field as runat  server    E g   if your JavaScript code is in an aspx file  not a separate JavaScript file    var val   document getElementById   lt   hdntxtbxTaksit ClientID  gt    value    If it s in a separate JavaScript file that isn t rendered by the ASP Net stuff  you ll have to find it another way  such as by class

User · Answer

Try setting Javascript value as in document getElementByName  hdntxtbxTaksit   value    0

User · Answer

I will suggest you to use ClientID of HiddenField  first Register its client Id in any Javascript Variable from codebehind  then use it in clientside script  as    cs file code   ClientScript RegisterStartupScript this GetType     clientids    var hdntxtbxTaksit     hdntxtbxTaksit ClientID  true     and then use following code in JS   document getElementById hdntxtbxTaksit  value

User · Answer

Prior to ASP Net 4 0  ClientID  Get the client id generated in the page that uses Master page  As Master page is UserControl type  It will have its own Id and it treats the page as Child control and generates a different id with prefix like ctrl    This can be resolved by using  lt    ControlName ClientID   gt  in a page and can be assigned to any string or a javascript variables that can be referred later   var myHidden document getElementById   lt    hdntxtbxTaksit ClientID   gt        Asp net server control id will be vary if you use Master page     ASP Net 4 0    ClientIDMode Property  Use this property to control how you want to generate the ID for you  For your case setting ClientIDMode  static  in page level will resolve the problem  The same thing can be applied at control level as well

User · Answer

asp HiddenField as    lt asp HiddenField runat  server  ID  hfProduct  ClientIDMode  Static    gt    js code       hfProduct   val  test     and the code behind   hfProduct Value ToString

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