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chem2.js

@@ -0,0 +1,66 @@
+function check(qnum, title, x1, x2, x3, x4, x5, x6, x7, left_side, right_side) {
+  const equations = document.forms["equations"];
+  const getValue = (name) => convert(equations[name]?.value || "");
+
+  const a = getValue(`q${qnum}a`);
+  const b = getValue(`q${qnum}b`);
+  const c = x3 > 0 ? getValue(`q${qnum}c`) : -1;
+  const d = x4 > 0 ? getValue(`q${qnum}d`) : -1;
+  const e = x5 > 0 ? getValue(`q${qnum}e`) : -1;
+  const f = x6 > 0 ? getValue(`q${qnum}f`) : -1;
+  const g = x7 > 0 ? getValue(`q${qnum}g`) : -1;
+
+  const x = window.open("", "temp", "width=250,height=150");
+  x.document.open();
+  x.document.write(`<title>${title}</title>`);
+
+  if (a == x1 && b == x2 && (c == x3 || c == -1) && (d == x4 || d == -1) && (e == x5 || e == -1) && (f == x6 || f == -1) && (g == x7 || g == -1)) {
+    x.document.write(`<font size="+1" color="green"><center><h1>Correct!</h1><p>Now close this window!</center></font>`);
+  } else {
+    x.document.write(`<font size="+1" color="red"><center><h1>Incorrect!</h1><p>Now close this window <br>and try again!</center></font>`);
+  }
+
+  x.document.close();
+}
+
+function show(qnum, title, x1, x2, x3, x4, x5, x6, x7, left_side, right_side) {
+  const equations = document.forms["equations"];
+  const getValue = (name) => convert(equations[name]?.value || "");
+
+  const a = getValue(`q${qnum}a`);
+  const b = getValue(`q${qnum}b`);
+  const c = x3 > 0 ? getValue(`q${qnum}c`) : -1;
+  const d = x4 > 0 ? getValue(`q${qnum}d`) : -1;
+  const e = x5 > 0 ? getValue(`q${qnum}e`) : -1;
+  const f = x6 > 0 ? getValue(`q${qnum}f`) : -1;
+  const g = x7 > 0 ? getValue(`q${qnum}g`) : -1;
+
+  const x = window.open("", "temp", "width=850,height=250,left=100,top=150,resizable=yes");
+  x.document.open();
+  x.document.write(`<title>${title}</title>`);
+  x.document.write(`<font size="+1" color="blue"><center><h1>`);
+
+  const isSpecialCase = (num, title) => {
+    return (
+      (num == 2 && title == "Manufacture of Sulphuric Acid") ||
+      (num == 3 && title == "Manufacture of Nitric acid") ||
+      (num == 4 && title == "Preparation of Ammonia")
+    );
+  };
+
+  if (isSpecialCase(qnum, title)) {
+    x.document.write("The correct equation is :");
+    x.document.write(`<p><center><font size="+2">${left_side} <img src='ebce2.gif'/> ${right_side}`);
+  } else {
+    x.document.write("The correct equation is :");
+    x.document.write(`<p><center><font size="+2">${left_side} &#8594; ${right_side}`);
+  }
+
+  x.document.write(`<p>Now close this window!</font></center>`);
+  x.document.close();
+}
+
+// If a box is blank, it contains 1. The following function does the conversion:
+function convert(z) {
+  return z === "" ? "1" : z;
+}