we will be adding a horizontal line, instruction 2 and instruction 3 (including the bulleted line) and the NEW FORM with 2 inputs a text input and a button input.
2. What is the value of the purple point on the number line?
3. Input and check your answer!
• Type value in box below. Then click Check Answer button.
Remember, html does not recognize a new line without a paragraph tag or a break row symbol
. So starting a new line of code does not start a new line of text!
In particular, notice that the entire form is on one line.
Also, html does not recognize more than one blank. So we use to add additional blanks. The bullet symbol is: •
Javascript
Remember the student has
Generated a new point, identified the point, typed his answer in the input box and clicked on Check Answer.
So the function checkAnswer(xval.value) is being called. What should it do?
Send the input value xval to the ggb file as the number variable a1
GeoGebra will check whether a1=a and set the value of okAns.
Get value of okAns from the ggb file and assign it to the variable okAns1 in js.
If okAns1 = 1 tell the student he is right else tell the student he is wrong.
A possible function is:
function checkAnswer(x) {
document.ggbApplet.evalCommand("a1="+x);
var okAns1 = document.ggbApplet.getValue("okAns");
if(okAns1 == 1) {
alert("You are right!");
} else {
alert("You are wrong.");
}
}
Copy and paste this code directly above the tag (line 69), save the html file and open it in your browser. Try correct and incorrect answers and see what happens.
A slightly more sophisticated approach using the text in the ggb file.
function checkAnswer(x) {
document.ggbApplet.evalCommand("a1="+x);
document.ggbApplet.setVisible("anstext",true);
}Copy and paste this code in place of the previous function.
BUT, to use this, we must turn off the text anstext when a New Point is generated.
So we add the command:
document.ggbApplet.setVisible("anstext",false);
to the onClick command in the first form and change the " quotes to ' quotes!
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