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webguru

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    Alternate To Switch Statement

    in Modern Javascript: Develop and Design

    Posted

    Thank you very much Mr. San,

    Your suggestion is fine, but the no of lines are coming to 135 i,e

     

    pipe_data[100][3][128] = [21.4, 100, 1.89, 3];

    pipe_data[100][3][256] = [21.9, 100, 1.92, 3.5];

    pipe_data[100][3][512] = [22.5, 100, 1.95, 3.9];

     

    so this list goes up to 135 lines i.e for pipe - 15 values; pressure - 3valves; stiffness -3 values , resulting total lines would be 135 lines. whereas in the switch case, the lines are 135 - Hence there is no much difference in the code what you suggested.

     

    Instead of putting entire JavaScript code in the HTML, I would like to put in a external js file and link to the page so that there would be better speed. Dear Mr. San, I request your attention, is there any better method with PHP?

    Alternate To Switch Statement

    in Modern Javascript: Develop and Design

    Posted

    Greetings everybody.

    I have written a code for my friend web for getting the weight; sp.gravity and wall thickness for the given Pipe diameter. All is working fine, but is there any better way to shorten the code?

     

     

    <!DOCTYPE html>

    <html lang="en">

    <head>

    <meta charset="UTF-8">

    <title>Pipe weight finder</title>

    <script language="JavaScript">function Cal(Atext, Btext, Ctext,form){

    var A = parseFloat(Atext);

    var B = parseFloat(Btext);

    var C = parseFloat(Ctext);

     

    // here, the values for A= pipe dia; B= Pressure class; c=stiffness;

    //the chart vlaues for K = weight/rmt; L= Specfic Gravity; M= wall thickness in mm; N= hydro test pressure in Mpa.

    // the switch case statement goes in matrix manner

    // for ine valve of A = three valves of B; and nine valves of C

     

    switch (true){

    case (A == 100 && B == 3 && C == 128): K =21.4; L =100; M =1.89; N=3; break ;

    case (A == 100 && B == 3 && C == 256): K =21.9; L=100; M=1.92; N=3.5; break ;

    case (A == 100 && B == 3 && C == 512): K =22.5; L=100; M=1.95; N=3.9; break ;

     

    case (A == 100 && B == 6 && C == 128): K =31.5; L=100; M=2.02; N=4.1; break ;

    case (A == 100 && B == 6 && C == 256): K =32.3; L=100; M=2.16; N=4.2; break ;

    case (A == 100 && B == 6 && C == 512): K =32.9; L=100; M=2.69; N=4.35;break ;

     

    case (A == 100 && B == 9 && C == 128): K =42.8; L=100; M=3.15; N=4.8; break ;

    case (A == 100 && B == 9 && C == 256): K =43.6; L=100; M=3.45; N=4.9; break ;

    case (A == 100 && B == 9 && C == 512): K =44.5; L=100; M=3.78; N=5.1; break ;

     

    case (A == 150 && B == 3 && C == 128): K =65.5; L=100; M=4.86; N=6.2; break ;

    case (A == 150 && B == 3 && C == 256): K =68.4; L=100; M=4.95; N=6.3; break ;

    case (A == 150 && B == 3 && C == 512): K =69.2; L=100; M=5.01; N=6.4; break ;

     

    // ... the code goes accordingly.

    // the code goes up to 1000 mm (i.e A=1000; B=9; C=512)

    }

     

    form.Ans1.value = K + " Kg/Rmt";

    form.Ans2.value = Math.round((K*100/3.28)/100) + " Kg/Ft" ;

    form.Ans3.value = L;

    form.Ans4.value = M + " mm";

    form.Ans5.value = N + " Mpa";

    }

    </script>

     

    </head>

    <body>

    <div style="text-align=center; background-color: #C0C0C0; width:225px; height:450px; border:2px double blue;">

    <P><FONT SIZE="+2">Pipe weight finder</FONT><hr color="#0099FF"> </P>

    <form name="ratefinder" method="post">

     

    <P>Enter Pipe dia:

    <select name="input_A" >

    <option value="100">100 mm

    <option value="150">150 mm

    <option value="200">200 mm

    <option value="250">250 mm

    <!--the option value goes up to 1000 mm -->

    </select></p>

     

    <P>Enter Pressure:

    <select name="input_B" >

    <option value="3"> 3 Kg

    <option value="6"> 6 Kg

    <option value="9"> 9 Kg

    </select></p>

     

    <P>Enter Stiffness:

    <select name="input_C" >

    <option value="128"> 128

    <option value="256"> 256

    <option value="512"> 512

    </select></p>

     

     

    <P><input type="button" VALUE="SUBMIT" onClick="Cal(this.form.input_A.value, this.form.input_B.value, this.form.input_C.value, this.form)">

     <input type="Reset" name="reset" value ="RESET" onClick ="(this.form);" /></P>

    <hr color="#0099FF">

     

    <P>Weight: <input type=text name="Ans1" SIZE=10></P>

    <P>Weight /Feet: <input type=text name="Ans2" SIZE=10></P>

    <P>Sp.Gravity: <input type=text name="Ans3" SIZE=10></P>

    <P>Wall Thickness: <input type=text name="Ans4" SIZE=10></P>

    <P>Hydro testing: <input type=text name="Ans5" SIZE=10></P>

    </form>

    </div>

    </body>

    </html>

     

     

    Even though the code works fine but:

    1. Due to long JavaScript line, the page getting slower.
    2. As the JS code is Matrix manner & the value are more than 15 x 3 x3 = 135 switch cases;

    Kindly suggest is there any better way though PHP?

     

    Thanking you.

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