I have a javascript method that checks the following condition
method(selection1,selection2)
{
if(selection1=="yes")
{
//Do something
}
if(selection2=="yes")
{
//Do something
}
}
now i pass arguments from code behind like this
ClientScript.RegisterStartupScript(GetType(), "id", "method('" + selection1 + "," + "'" + selection2 + "')", true);
Here selection is a string variable
string selection1="Yes"
But the desired functionality doesn't work out. I know the javascript is correct because when i use hardcoded arguments then the javascript runs.
Kindly help. Thanks
Call it this way:
Page.ClientScript.RegisterStartupScript(this.GetType(), "MyScript", javascript:method('"+selection1+"','"+selection2+"')", true);
This will call the function and send the params as well, just be sure about the case that use in the string.
Your code missing ' ending quotes for first string argument.
Use like this
"method('" + selection1 + "', '" + selection2 + "')"
For comparison to be success the string must be exactly equal. selection1 value should be "yes" for the condition to be success
Related
I am work on some OData query calls to Microsoft CRM and need my query in a very specific format.I am passing parameters to a function which then adds the URL to my query. What I am passing my retrieve function is as follows:
webAPI.REST.retrieveEntity(
"EntityDefinition",
id,
+ "/Attributes(LogicalName='" + logicalAttribute + "')"
+ "/Microsoft.Dynamics.CRM.PicklistAttributeMetadata"
+ "?$select=LogicalName&$expand=OptionSet"
, null)
In debugging my parameter with the query options is:
"NaNmylogicalattribute')/Microsoft.Dynamics.CRM.PicklistAttributeMetadata?$select=LogicalName&$expand=OptionSet"
As you can see, my "/Attributes(LogicalName=" was replaced with "NaN". How do I prevent this from occurring?
Here is the problem:
id,
+ "/Attributes(LogicalName='" + logicalAttribute + "')"
Since you aren't starting with a String, the leading + is coercing your String into a Number (it isn't a Number, hence NaN). Just remove that first leading + and it will work:
id,
"/Attributes(LogicalName='" + logicalAttribute + "')"
I have a function that I need to use for filtering table rows:
setFilterString("Filter");
But I have a problem. I can set it to
setFilterString("OrderID = 5");
and it will filter out row where OrderID is equal to 5 but if i try using a variable that has a value taken before like this
setFilterString("OrderID = vOrderID");
I get error "Invalid column name 'vOrderID'." (as vOrderID is variable and not a column, I guess)
I have seen somewhere in filter section inputting something like this ("OrderID = '" & vOrderID & "'") but it doesn't have any result at all for me. Doesn't even throw any error in the console.
JavaScript assumes you are just passing a string to the function. If you want to use the variable, you should try this:
setFilterString("OrderID = '" + vOrderID + "'"); // Results in OrderID = '5'
or
setFilterString("OrderID = " + vOrderID); // Results in OrderID = 5
depending on the body of your function.
Use + instead of &: setFilterString("OrderID = " + vOrderID) should work.
Use "+" for merge strings:
setFilterString("OrderID = " + vOrderID)
You can also try to use ${idvOrderID} inside string:
setFilterString("OrderID = ${vOrderID}")
Or:
setFilterString(sprintf("OrderID = %s", vOrderID))
Remember about difference between ' and "
I am trying to load a javascript in WebView to do some calculations and get the output in a string. I tried to use following code
string htmlFragment = "<html><head><script type='text/javascript'>" +
"function doubleIt(incoming){ " +
" var intIncoming = parseInt(incoming, 10);" +
" var doubled = intIncoming * 2;" +
" document.body.style.fontSize= doubled.toString() + 'px';" +
" return doubled.toString());" +
"};" +
"</script></head><body>" +
"<div id = 'myDiv'>I AM CONTENT</div></body></html>";
htmlView.NavigateToString(htmlFragment);
htmlView.LoadCompleted += async(s1,e1) =>
{
string result = await htmlView.InvokeScriptAsync("eval", new string[] { "doubleIt(25)" });
Debug.WriteLine(result);
};
Update
I am able to load simple javascript easily now based on help provided in the answer. But now I am facing issues when there is more than one function in javascript, I am getting an exception. I am trying the following code
string htmlFragment = #"<html><head><script type='text/javascript'>" +
"function a(){return 10;};" +
"function b(){return 20;};" +
"function c(){return 30;};" +
"return (a()*b()*c());" +
"</script></head><body>" +
"<div id = 'myDiv'>I AM CONTENT</div></body></html>";
Please suggest.
The documentation for this feature is really poor. It took me some time to figure out how to invoke Javascript in UWP WebView
When you first look at the function call webView.InvokeScriptAsync(string,string[]) your initial reaction is that they want the function name as the first parameter and then the function paramaeters as the string array. (mainly because the MSDN documentation says this)
Parameters
scriptName
Type: System.String [.NET] | Platform::String [C++]
The name of the script function to invoke.
arguments
Type: System.String[]
[.NET] | Platform::Array [C++]
A string array that
packages arguments to the script function.
HOWEVER, this is wrong and will lead to hours of head banging. REALLY, what they want is the word "eval" in the first parameter and then a string array of functions, and or commands you wish to eval
var value = await webViewer.InvokeScriptAsync("eval",
new string[]
{
"functionName(functionParams)"
});
Having worked with Microsoft APIs for a few years now I am convinced that this is not the intended way of consuming this function and is a bit of a hack. Unfortunately if you want to consume JavaScript this is the only way that I know that works currently.
Anthony,
Try to check your own suggestion:
await webViewer.InvokeScriptAsync("eval",
new string[]
{
"functionName(functionParams)"
});
or:
await webViewer.InvokeScriptAsync(functionName, new string[]{ functionParameters });
The same as Microsoft suggests, just you are limiting a function name by one ("eval") - not necessary. Trust me, you can use any function name, as I am now with UWP and before with windows phone hybrid apps.
The question is already 4 years old, but I'm coming to see why you were getting an empty string as a result.
In your example, the functions in JavaScript return integers while the expected value is of type string.
By modifying these functions and returning a string like this:
string htmlFragment = #"<html><head><script type='text/javascript'>" +
"function a(){return '10';};" +
"function b(){return '20';};" +
"function c(){return '30';};" +
"</script></head><body>" +
"<div id = 'myDiv'>I AM CONTENT</div></body></html>";
We get the good result on the way back.
When trying to pass String value to the javascript function , Uncaught ReferenceError is thrown on the browser console.
Below is the sample code:
function mySampleTest(myId, comments){
alert("myId " + myId);
alert("comments : " + comments);
}
var myTest = function(value, rowIndex) {
var myId = this.grid.getItem(rowIndex).MY_ID;
var comments = this.grid.getItem(rowIndex).COMMENTS;
return "<img src=<%=request.getContextPath()%>/images/image1.gif width=\"25\" height=\"25\" onClick=\"mySampleTest("+ myId +" , "+comments+")\">";
};
The JavaScript function mySampleTest is being called when the user clicks the image but it throws a JavaScript error when I pass the string comments to mySampleTest function. If I remove the comment parameters and just pass the myId to mySampleTest(..), it works fine.
Please suggest how to pass string values to the JavaScript function.
I tried the below also, but didn't work.
return "<img src=<%=request.getContextPath()%>/images/image1.gif width=\"25\" height=\"25\" onClick=\"mySampleTest("+ myId +" , \'' + comments + '\')\">";
As a professor once told me, much of writing code involves "being the computer".
Consider your function's output for a moment and you should see the issue pretty quickly:
<img src=whatever/your/context/path/is/images/image1.gif
width="25" height="25"
onClick="mySampleTest(12345, this is a comment)">
Your javascript is invalid:
mySampleTest(12345, this is a comment)
It should be:
mySampleTest(12345, 'this is a comment') // <--- notice the quotes
Which would translate all the way back to:
return "<img src=\"<%=request.getContextPath()%>/images/image1.gif\" width=\"25\" height=\"25\" onClick=\"mySampleTest('"+ myId +"' , '"+comments+"')\">";
Not to mention your src attribute really needs quotes.
I am calling a function with one parameter "modalXPTO.HtmlFieldPrefix" sucessfuly like this:
modalXPTO.AdditionalJavaScriptCallback = "myFunction('" + modalXPTO.HtmlFieldPrefix + "')";
However, I would like to send more than one parameter, and I would expect this should work:
modalXPTO.AdditionalJavaScriptCallback = "myFunction('" + "{parentContainer:" + modalXPTO.ModalDivId + ", htmlFieldPrefix:" + modalXPTO.HtmlFieldPrefix + "}" + "')";
But it doesn't. Can anyone tell me what I am missing?
Here is the myFuntion declaration:
function myFunction(arg){
alert(arg.htmlFieldPrefix);
alert(arg.parentContainer);
}
I've fixed it.
modalXPTO.AdditionalJavaScriptCallback = "myFunction(" + "{parentContainer:'" + modalXPTO.ModalDivId + "', htmlFieldPrefix:'" + modalXPTO.HtmlFieldPrefix + "'}" + ")";
It is because of the misplaced "'". I wanted to pass an object with two parameters, but because of these characters I was passing a string instead.