javascript - Body.onLoad seems to execute too early

Monday, 13 February 2017

javascript - Body.onLoad seems to execute too early

EDIT : SORRY, PROBLEM IS DIFFERENT
- It should be </code> instead of <code><textarea name="txtScene"></code> <hr /> It seems that <code><body onLoad="init();"></code> executes <code>init();</code> before all HTML contend inside <code>body</code> is created. I particular, have this HTML: <pre><code><script src="/home/prokop/Dropbox/MyDevSW/javascript/WebGL/shader_builder/GLSLscreen.js"></script> <body onLoad="init_GLSLScreen();"> <textarea name="txtScene" cols="60" rows="20" onChange="updateShader(this)"> vec4 scene( Ray ray ){ vec4 hit = vec4( POSITIVE_INF, vec3(0.0) ); Sphere SURF1 = Sphere( vec3(0.0,0.0,0.0), 1.0 ); Sphere SURF2 = Sphere( vec3(1.0,0.0,0.0), 0.75 ); Sphere SURF3 = Sphere( vec3(0.0,1.0,0.0), 0.75 ); vec2 ts1; ADD( SURF1 ); SUB( SURF2 ); SUB( SURF3 ); return hit; }

and inside init_GLSLScreen() I need to run updateShader with textarea name="txtScene" as an argument. Like this

function init_GLSLScreen(){
    // ... some stuff ... don't care
    console.log ( document.getElementById("txtScene") );
    updateShader( document.getElementById("txtScene") );

    // ... some stuff ... don't care
}

But document.getElementById("txtScene") returns null

The problem is described here with solution to either move the javascript below HTML (I guess not possible in my case) or to run the javascript onLoad ... which I do but does not work.

Striped down code which reproduces this behaviour (if you look into web-console)




    05.10 - Custom fragment shader
    



    
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Monday, 13 February 2017

javascript - Body.onLoad seems to execute too early

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