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How to save pointer in JavaScript and retrieve further


By : dropuse
Date : October 14 2020, 08:10 PM
help you fix your problem After searching a lot and trying different-2 scenarios finally i found a solution that how to store the address and retrieve in future for further operations :-
(Note:- here i am using ref, ffi modules) so for storing pointer , create a buffer that can hold pointer type like below
code :
     const ref = require('ref');        
     const  ffi = require('ffi');

     var buf = ref.alloc('pointer');
     ref.writePointer(buf, 0, pointer);  // pointer or memory address
     memory_pointer = ref.readPointer(buf,0);   // buf is buffer which we created above, 0 for offset 


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Parse.com / Javascript - Save users objectid string as user pointer


By : jelly
Date : March 29 2020, 07:55 AM
wish help you to fix your issue How do I save a user pointer to an object when i have the object id of the user. , So you should save a pointer to the user to the task.
code :
var Task = Parse.Object.extend("Tasks");
var task = new Task();

task.set("user", user);
task.set("title", "taskTitle");
task.set("date", taskDue);

task.save(null, {
    success : function(task) {
        // Execute any logic that should take place after the object is saved.
        console.log('New object created with objectId: ' + task.id);
    },
    error : function(gameScore, error) {
        // Execute any logic that should take place if the save fails.
        // error is a Parse.Error with an error code and message.
        console.log('Failed to create new object, with error code: ' + error.message);
    }
});
var user = task.get("user");
user.fetch({
  success: function(user) {
       //fetch user is here
  }
});
function getUserFromUsername(username) {
    var User = Parse.Object.extend("_User");
    var query = new Parse.Query(User);
    query.equalTo("username", username);
    return query.first();
}

getUserFromUsername('testUsername').then(function(result) {
    //use User here
}, function(error) {
    alert("Error: " + error.code + " " + error.message);
});

Parse retrieve pointer from current user in javascript


By : Ranjeet Kumar
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further According to the documentation:
"By default, when fetching an object, related Parse.Objects are not fetched. These objects' values cannot be retrieved until they have been fetched like so:"
code :
var post = fetchedComment.get("parent");
post.fetch({
  success: function(post) {
    var title = post.get("title");

  }
});
var currentUser = Parse.User.current();
var comParent = currentUser.get("ComParent");
comParent.fetch({
    success: function(comParent) {
        var name = comParent.get("Name");
        alert(name); // this one will work
    }
});
alert(comParent.get("Name")); // this one wont work, see below

Save and retrieve user input from database with javascript?


By : Jithin
Date : March 29 2020, 07:55 AM
this will help @SpencerWieczorek is not wrong, PHP and MySql will work for what you need. However, there is a bit of a learning curve there.
For a beginner, I'd recommend using Parse. It's free and it makes saving and retrieving data trivial. Below is simple app that lets the user input a class year and their name and saves them so others can see them on the same page.
code :
Parse.initialize("Application ID", "JavaScript key");

function saveInput(){
        //get our new values 
        var klassYear = document.getElementById('klassYear').value.trim();
        var studentName = document.getElementById('studentName').value.trim();
  
        
       // dont continue if either value is blank
       if(klassYear=="" ||studentName=="" ){
           alert ('Please fill in both fields.') ;
           return; 
       }
       
   
        // create the `Parse` object
        var Klass = Parse.Object.extend("Klass");
		var _klass = new Klass();
		
        // set the object's values to our input values
		_klass.set("klassYear", klassYear);
		_klass.set("studentName", studentName);
		
        // save the object
		_klass.save(null, {
		  success: function(_klass) {
            // if the save succeeded, add the new info to our page
            retrieveSavedInputs()
            
		  },
		  error: function(_klass, error) {
            // save failed, do error handeling here
			console.log('Failed to create new object, with error code: ' + error.message);
		  }
	    });
  }


function retrieveSavedInputs(){
     
      // create a query to search for  our `Klass` items
      var Klass = Parse.Object.extend("Klass");
      var query = new Parse.Query(Klass);
          query.find({
			success: function(results) {
            
              // get our table's `tbody`  and clear it
              var myTbl = document.getElementById('mytbl');
              myTbl.innerHTML='';
              
              // `results` is an array of all the matches
              // loop through each
              for(var i =0; i < results.length; i++){
                
                  // get the values from the saved object
                  // note that `klassYear` and `studentName` 
                  // are not available within the scope of the `success` function
                  var k = results[i].get("klassYear")
                  var s = results[i].get("studentName")
            
                  // create a table row with the info and add it at the top of `contents`
                 myTbl.innerHTML = '<tr><td>'+k+'</td><td>'+s+'</td></tr>' + myTbl.innerHTML;
                  
                              
              }
			},
			error: function(error) {
			console.log("Error: " + error.code + " " + error.message);
			}
      });
}

// load all previously saved items
window.onload = retrieveSavedInputs(); 

//clcik handeler for the btn
document.getElementById("myBtn").addEventListener('click', saveInput , false);
table{
  margin-top:50px;
  }
 Class Year: <input type="text" id="klassYear"  value=""/> <br>
 Name: <input type="text" id="studentName" value=""/> <br>


 <input type="button" id="myBtn" value="Submit" class="button" />
<br> Add a ame and year above and see it added to the list below
    
<div id="myDiv"></div>


<table  width="400" border="1">
   <thead>    
       <tr>
          <th scope="col">Class Year</th>
          <th scope="col">Student Name</th>
       </tr>
  </thead>     
  <tbody id="mytbl">
  </tbody>
</table> Class Year: <input type="text" id="klassYear"  value=""/> <br>
 Name: <input type="text" id="studentName" value=""/> <br>


 <input type="button" id="myBtn" value="Submit" class="button" />
<br> Add a ame and year above and see it added to the list below
    
<div id="myDiv"></div>


<table  width="400" border="1">
   <thead>    
       <tr>
          <th scope="col">Class Year</th>
          <th scope="col">Student Name</th>
       </tr>
  </thead>     
  <tbody id="mytbl">
  </tbody>
</table>

Javascript using local storage to save and retrieve table id


By : Jens Alsig
Date : March 29 2020, 07:55 AM
seems to work fine Your missing an argument for setItem(). What you are looking to do is localStorage.setItem("table", table). First parameter is the key with which you can grab the data from the local storage later and the second one is the actual data you want to save. The variable table must contain a string otherwise you need to convert it to a string because as far as i'm aware local storage can only save strings.

Need to make selected text as bold/italic/underline using javascript, and also save & retrieve the same using c#


By : manderson
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Here is a question that answers your problem about getting the highlighting text How to get selected text in textarea?
About making the selected text bold you would need to use html tags or something like bbcode and parse it to html when you print it on to a page.
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