1:   How to check an element is exist in a form using JQuery or not?
Options:
  1. if (#("myControlId")){
      // your logic goes here
    }
    
  2. if ($("#myControlId").exists){
      // your logic goes here
    }
    
  3. if ($("#myControlId")){
      // your logic goes here
    }
    
  4. if (exists("#myControlId")){
      // your logic goes here
    }
    

Answer: Option 3

Explanation:

You can use check the element is exists or not using simple if statement and the control id of an element for eg

if ($("#myControlId")){
  // your logic goes here
}
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2:   How to remove css class using JQuery?
Options:
  1. class.add("yourCSSClass")
  2. #cssClass("myDiv").remove("className")
  3. removeClass("#myDiv")
  4. $("divId").removeClass("yourCSSClass");

Answer: Option 4

Explanation:

You can use removeCLass() function of JQuery to add css class to a control. for eg $("divId").removeClass("yourCSSClass"); Discuss this in Forums

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3:   How to add css class to a control using JQuery?
Options:
  1. $("divId").addClass("yourCSSClass");
  2. #cssClass("myDiv").add("className")
  3. addClass("#myDiv")
  4. class.add("yourCSSClass")

Answer: Option 1

Explanation:

You can use addClass() function of JQuery to add css class to a control. for eg $("divId").addClass("yourCSSClass"); Discuss this in Forums

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4:   How to select an element using JQuery?
Options:
  1. $("#myDiv")
  2. element("myDiv")
  3. #("myDiv")
  4. select.element("myDiv")

Answer: Option 1

Explanation:

You can use $("#myDiv") code to select an element using Query. In this code we select an element whose id is myDiv. Discuss this in Forums

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5:   How to make control enabled using JQuery?
Options:
  1. attr('disabled', true);
  2. attr('enabled', true);
  3. attr('enabled', false);
  4. removeAttr('disabled');

Answer: Option 4

Explanation:

By default all the control will be enabled. But if you would like to control enable you can use removeAttr('disabled') to make control enabled foe eg. $('#myControl').removeAttr('disabled'); Discuss this in Forums

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