51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
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<HTML>
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<HEAD>
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<TITLE>Throwing a Custom Error Object Exception - Happy Codings :-) JavaScript Code Examples</TITLE>
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<SCRIPT LANGUAGE="JavaScript">
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var letters = new Array("A","B","C","D","E")
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function getErrorObj(msg) {
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var err = new Error(msg)
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// take care of IE5/5.5
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if (!err.message) {
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err.message = msg
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}
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err.name = "MY_ERROR"
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return err
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}
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function getLetter(fld) {
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try {
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var inp = parseInt(fld.value, 10)
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if (isNaN(inp)) {
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throw getErrorObj("Entry was not a number.")
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}
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if (inp < 1 || inp > 5) {
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throw getErrorObj("Enter only 1 through 5.")
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}
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fld.form.output.value = letters[inp]
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}
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catch (e) {
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switch (e.name) {
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case "MY_ERROR" :
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alert(e.message)
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fld.form.output.value = ""
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fld.focus()
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fld.select()
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break
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default :
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alert("Reload the page and try again.")
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}
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}
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}
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</SCRIPT>
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</HEAD>
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<BODY>
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<H1>Throwing a Custom Error Object Exception</H1>
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<HR>
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<FORM>
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Enter a number from 1 to 5:
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<INPUT TYPE="text" NAME="input" SIZE=5>
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<INPUT TYPE="button" VALUE="Get Letter" onClick=getLetter(this.form.input)>
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Matching Letter is:<INPUT TYPE="text" NAME="output" SIZE=5>
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</FORM>
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</BODY>
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</HTML>
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